Service Bulletin - MTTB
SERVICE BULLETIN #30 - ISSUE DATE: October 3, 2008
Posted Monday, October 6, 2008
SUBJECT: Military Tandem Tether Bundle System, (MTTB)
Subject: Military Tandem Tether Bundle System, (MTTB)
Status: An accident in February 2008 exposed a number of issues regarding the use, care and
performance of major components of the parachute system and MTTB as used on MTTB payload
jumps. Jumping the MTTB system was placed on hold by the U.S. Military until evaluation, redesign
and testing of the system could verify that the operational requirements of jumping the MTTB system
met more specific performance criteria.
Strong Enterprises independently performed several MTTB drops to verify the need for improvement in
all aspects of the equipment used for MTTB payload drops.
This Service Bulletin focuses only on the MTTB system, the redesign and subsequent testing of the
much-improved MTTB/LARS Gen5 (Patent Pending) system.
Background: During normal MTTB jumps, the MTTB system can be delivered or landed three
different ways:
1. Static lined from the jumper under a full open canopy, to land independently under the 30-foot
round canopy.
2. Released into free-fall to open at a predetermined altitude by AAD and land independently from
the jumper.
3. Retained by the jumper allowing them to land with the MTTB attached.
A fourth performance capability is to drop the MTTB system from the aircraft independently from
the jumper, allowing it to free-fall, activate the recovery parachute by AAD and land the payload.
Normally the release of the MTTB system presents no problems to the jumper. On occasion the release
can be difficult to impossible. This can present a significant problem to the jumper in the case of a
malfunction or emergency situation.
On previous systems, the release handle releases four sets of 3-ring releases and a safety cable. Because
of the many issues involved – including care and maintenance, housing tolerances, worn cables, and
normal wear and tear on the system over use – hard pulls on release handle can and have been
experienced.
Redesign and Testing: Because of these many variable factors, Strong Enterprises has redesigned
the release mechanism to allow the payload to assist in releasing the cables, and thereby releasing the
payload. This method is called the Load Assisted Release System or LARS (Patent Pending). The
release handle has a single cable going to a single heavy duty 3-ring release which when released, allows
the payload to drop 10 inches on the tether, which in turn extracts the four cables from the 3-Ring
attachment points (two top, two side) and releases the system from the jumper. Static testing has shown this
method to have a consistent low pull force and be extremely reliable and
effective in a wide range of payload weights. Several other modifications also have been incorporated
that enhance service life and usefulness of the MTTB/LARS Gen5 (Patent Pending) system.
Live Testing: Live MTTB/LARS Gen5 (Patent Pending) testing has been performed in a variety of
different jumping environments: free-fall with no drogue, free-fall with only the drogue deployed, under
full canopy in normal flight and with the main canopy in spinning turns and release after an open main
to reserve canopy transfer (performed with Mil-DHT). All modes proved very successful with a minimal
amount of effort needed to release the MTTB/LARS Gen5 (Patent Pending) and jettisoned the payload.
Service Bulletin: Strong Enterprises is requesting all users and owners of the current MTTB
configuration to contact Strong Enterprises and make arrangements to have these systems returned to the
manufacturer for conversion to MTTB/LARS Gen 5 (Patent Pending) activation system.
Strong Enterprises’ time to receive, inspect, evaluate and reconfigure older versions of the MTTB
system to the MTTB/LARS Gen 5 (Patent Pending) configuration will take five working days.
MTTB/LARS Gen 5 (Patent Pending) systems will be returned via the same method as received.
Updated manuals, which include assembly, use, and maintenance instructions, will be included with
each system serviced and returned. There will be a nominal charge for this based on the modifications
required. Price is TBD
Compliance Date: Before next MTTB jump.
Identification: Military Tandem Tether Bundle System, SE P/N 150305.
Authority: Strong Enterprises, 11236 Satellite Blvd. Orlando, FL 32839 USA
Phone 407- 859-9317, Fax, 407-850-6978.
email: sales@strongparachtues.com
Further Information For additional information, copies of live MTTB/LARS Gen5 testing,
Manual, and conversion scheduling, please contact sales@strongparachutes.com
DISTRIBUTION: All owners and users on record. www.strongparachutes.com
STRONG ENTERPRISES
11236 SATELLITE BLVD
ORLANDO, FL 32837
Tel 407 859 9317
Fax 407 850 6978
ted@strongparachutes.com
www.strongparachutes.com
Download the Bulletin in PDF
Service Bulletin - Argus Automatic Activation Device (AAD)
SERVICE BULLETIN #29 - ISSUE DATE: October 2, 2008
Subject: Argus Automatic Activation Device (AAD), testing and approval for use in the
Dual Hawk Tandem System. (Reference: SE Service Bulletin 22 & explanation)
Status: Limited approval of use in Dual Hawk Tandem System of Argus AAD Units
manufactured after 05/2007.
Identification: Argus AAD Unit: FW-01, DoM 05/2007
2-Pin Cutters: 092666-119A/06 DoM 04/2006. 092773 373A/07 DoM 01/2007.
092773 024A/07 DoM 01/2007.
Background: Strong Enterprises was asked to provide approval for the Argus AAD for use in
the Dual Hawk Tandem System. It has always been Strong Enterprises’ policy to test products
and components in real environments before approving any item for general tandem use with the
Dual Hawk Tandem System.
In 2007 and 2008 Strong Enterprises completed four drop-sessions with the Argus AAD in
which approximately eight drops were performed. Each drop was performed with the Argus on
Tandem mode.
NOTE: Tandem mode is required for all tandem jumps.
The last session, April 15 thru 17, 2008 involved three drops:
#1. No drogue, 500lbs (226Kg), altitude 7,246 Ft. (2258m) AGL. Max speed 194mph
(312Km/hr). Reserve activation achieved, canopy open by 1750 Ft (533.4m).
#2. With drogue, 500lbs (226Kg), altitude 7,246Ft. (2258m) AGL, Max speed 147mph
(236.5Km/hr). Reserve activation achieved, canopy open by 1750Ft (533.4m).
#3. With drogue, 500lbs (226Kg), altitude 3,000Ft. (914m) AGL. Max speed 105mph
(169Km/hr). Reserve activation achieved, canopy open by 1900Ft (579m).
Service Bulletin: This service bulletin authorizes use of the Argus AAD DoM 05/2007 or later
and Dual Cutters DoM 01/2007 or later, when installed in accordance with the Dual Hawk
Tandem Manual installation guidelines, P/N510045, Rev. H, 05/08, Sec. 5.1 and Argus User’s
Guide. As previously noted, the Argus AAD is only approved for the Dual Hawk Tandem
System when used in Tandem Mode.
Approval Date: September 5, 2008
Limitation: As with any add-on component, Strong Enterprises assumes no liability for faulty
installation or misuse of the equipment nor makes any guarantees that the equipment will
function as intended, even if installed correctly.
Authority: Strong Enterprises, 11236 Satellite Blvd. Orlando, FL 32837.
Distribution: Manufacturer, FAA, USPA, Foreign Parachute Organizations, Dual Hawk
owners on record, Parachutist, Skydiving Magazine, www.strongparachutes.com.
STRONG ENTERPRISES
11236 SATELLITE BLVD
ORLANDO, FL 32837
Tel 407 859 9317
Fax 407 850 6978
ted@strongparachutes.com
www.strongparachutes.com
Download the Bulletin in PDF
Service Bulletin - Vigil II Automatic Activation Device
SERVICE BULLETIN #28 - ISSUE DATE: October 2, 2008
SUBJECT: Vigil II Automatic Activation Device, manufactured by Advanced Aerospace
Designs, testing and approval for use in the Dual Hawk Tandem System.
(Reference: SE Service Bulletin 22 & explanation)
STATUS: Limited approval of use in Dual Hawk Tandem System of Vigil II Units
manufactured after 10/2007.
IDENTIFICATION: Vigil II Unit: S/N5051/74 (#9649). Date of Manufacture: 10/2007.
Cutters, Type 3: 9582600-74 11-07-4 L421, 9582006-17 11-07-4 L421,
9582006-47 11-07-4 M147.
Background: Strong Enterprises was asked to provide approval for the Vigil II AAD for use in
the Dual Hawk Tandem System. It has always been Strong Enterprises’ policy to test products
and components a in real environment before approving any item for general tandem use with the
Dual Hawk Tandem System.
In 2007 and 2008 Strong Enterprises completed four drop-sessions with the Vigil II in which
approximately eight drops were performed. Each drop was performed with the Vigil II on
Tandem mode.
NOTE: Tandem mode is required for all tandem jumps.
The last session, April 15 thru 17, 2008 involved three drops:
#1. No drogue, 500 lbs (226 Kg), altitude 7,246 Ft. (2258 m) AGL. Speed 163 mph
(262 Km/hr). Reserve activation achieved.
#2. No drogue, 500 lbs (226 Kg), altitude 7,246 Ft. (2258 m) AGL, Speed 147 mph
(236.5 Km/hr), altitude 7,246 Ft. (2258 m). Reserve activation achieved.
#3. No drogue, 500 lbs (226 Kg), altitude 3,000 Ft. (914 m) AGL. Speed 91 mph
(146.5 Km/hr). Reserve activation achieved.
Service Bulletin: This service bulletin authorizes use of the Vigil II DoM 10/2007 or later
and Dual Cutters DoM 11/2007 or later, when installed in accordance with the Dual Hawk
Tandem Manual installation guidelines, P/N510045, Rev. H, 05/08, Sec. 5.1 and Vigil II
Instruction Manual. As previously noted, the Vigil II AAD is only approved for the Dual
Hawk Tandem System when used in Tandem Mode.
Approval Date: September 5, 2008
Limitation: As with any add-on component, Strong Enterprises assumes no liability nor
makes any guarantees that the equipment will function as intended if installed correctly.
Authority: Strong Enterprises, 11236 Satellite Blvd. Orlando, FL 32837.
Distribution: Manufacturer, FAA, USPA, Foreign Parachute Organizations, all Dual
Hawk owners on record, Parachutist, Skydiving Magazine, www.strongparachutes.com.
STRONG ENTERPRISES
11236 SATELLITE BLVD
ORLANDO, FL 32837
Tel 407 859 9317
Fax 407 850 6978
ted@strongparachutes.com
www.strongparachutes.com
Download the Bulletin in PDF
Service Bulletin - Quasar II
SERVICE BULLETIN #26 - ISSUE DATE: April 18,
2007
Posted Thu Apr 19 2007
SUBJECT: Quasar
II, P/N115100, Quasar II Trainer P/N115102,
Military Quasar II P/N 115103.
Quasar II Reserve pilot chute launch under
conditions with main canopy still in main
container.
IDENTIFICATION: All Quasar
II harness/container systems. Including both
Quasar IIs with ?Flinger/PRO? (Positive Reserve
Opening) assembly installed as original installation
or modification, and those without.
STATUS: Mandatory removal
of ?Flinger?/PRO assembly and replacement
of inner sub-flap with pilot chute Base Plate
and pilot chute before next jump.
BACKGROUND: Recent on-the-ground
activations of several Quasar II reserve containers
with the main canopy still in the container,
showed slow or impeded pilot chute activation.
There have been no reports of in-air incidents.
Repeated tests with the main tray open and
riser covers off (simulating an open main
to reserve cutaway), resulted in clean reserve
pilot chute deployments clearing the reserve
container. Further testing revealed the steel
?Flinger?/PRO assembly may take a set beyond
the designed acceptable range, restricting
movement of the side flaps and reserve pilot
chute.
SERVICE BULLETIN: As a precautionary
measure, Strong Enterprises requests that
all Quasar II systems be returned to Strong
Enterprises for modification, that includes:
- Removal of the steel ?Flinger?/PRO assembly.
- Top sub-flap replacement (improved with
a Base Plate.)
- Pilot chute replacement.
STRONG ENTERPRISES
11236 SATELLITE BLVD
ORLANDO, FL 32837
Tel 407 859 9317
Fax 407 850 6978
ted@strongparachutes.com
www.strongparachutes.com
Download
the Bulletin in PDF
Download
the Press Release
TANDEM SERVICE BULLETIN #24
(Download
PDF file 73kb)
(Download
Appendix M PDF file 244kb)
STATUS: Mandatory x
COMPLIANCE DATE: June 2, 2006
IDENTIFICATION: (TICC) Training Syllabus, Appendix
M, PN 590011 Rev L
Dual Hawk Passenger Harness, PN 240075-4
BACKGROUND: Strong Enterprises started tandem parachuting in
1983, developed,TSO’d and has marketed
the Dual Hawk Tandem system since 1985. Tandem
jumping is the most popular method of providing
a skydive to people interested in experiencing
the sport. Presently there have been over
2,000 Dual Hawk Tandem Systems manufactured
and sold thought the world. There are over
4,300 registered Tandem Instructors certified
to use the Dual Hawk Tandem System. It is
estimated that there have been over 2 million
tandem jumps made on the Dual Hawk tandem
System.Although there have been parachute
malfunctions and canopy damage, there has
been no incidents or reports of harness (student/passenger
or instructor harness) failure. A recent (May
27, 2006) tandem passenger fatality, in which
the student/passenger slipped out of the harness
backwards between the back diagonal straps
and the horizontal back strap during main
canopy deployment has led to this Service
Bulletin.
FACTORS: This specific accident involves a 5’4”
female student/passenger thatweighted 230
lbs. The Tandem Instructor was 5’11”
and 145 lbs. Ground video footage verifies
that the harness was not properly adjusted
and extremely loose on the student/passenger
before boarding the aircraft. Video footage
of the drogue fall shows the student/passenger’s
horizontal back strap was located under at
least one leg strap (between the leg strap
and the passengers leg), not around the lower
back as intended. Also, the main lift webs,
diagonal back straps and lower attachment
points from the tandem instructor to the student/passenger
harness are all out to the maximum length.
SERVICE BULLETIN: It is important for Tandem Instructors to
know that they are ultimately the responsible
person for all aspects of the tandem jump.
They are responsible to assure a proper fit
ofthe harness, it’s comfort and safety
as well as the entire performance of the tandem
jump for themselves and the student/passenger.
The procedure of fitting the harness must
be accomplished on the ground, where adjustments
in proper harness fit can comfortably be made,
thoroughly checked and verified, before boarding
the aircraft.
Each and every current Strong Tandem Instructor
should review the Dual Hawk Tandem Service
Manual (DHT) Rev. L, Appendix
M, to re-familiarize themselves with instructions
for fitting the Passenger Harness PN 240075-4
to the student/passenger. These instructions
are attached to this Bulletin.
It is also important for Drop Zone management to establish guidelines of any
physical or mental limitations for evaluating
potential tandem student/passengers to as
certain that they are capable of being able
to provide a safe and comfortable tandem parachute
jump within these parameters.
PRODUCT SERVICE BULLETIN (Download
PDF file 8kb)
#24, October 2001
ITEM: Dual Hawk Tandem 20.5’ Flex
Pin Replacement
STATUS: Mandatory
INDENTIFICATION: Dual Hawk Tandem 20.5” Flex Pin Part No.
780019 used on 2
loop closing system. Manufactured from 24 August, 2000 to 26 October 2001.
BACKGROUND: Strong Enterprises has found some Flex Pins that have cable
strands
nicked at the swedge during manufacture. Frayed or nicked strands of cable
are difficult
to see under the swedge and heat shrink tubing.
There has been one report of the cable broken at time of main packing.
If the flex pin fails at drogue release, it could cause a drogue in tow
malfunction.
As a precaution Strong Enterprises is sending replacement 20.5” flex
pins to all Dual
Hawk Tandem owners on record who are using the 2-pin closing loop system.
SERVICE BULLETIN: All 20.5” flex Pins manufactured from 24
August, 2000 to 26
October 2001 will be replaced at no charge with new 20.5” flex pins
identified with clear
heat shrink tubing over the swedge. The replacement flex pins can be easily
installed
by removing the older (black shrink tubing) flex pin. Installation time
takes approximately
two minutes and should be done before the next jump. Free replacement flex
pins are
enclosed with this Service Bulletin. Please return the old Flex Pins to
Strong Enterprises.
QUALIFIED PERONNEL: Rigger, Packer, or Tandem Instructor.
DISTRIBUTION: Mailing to all Dual Hawk Owners who have:
a) Purchased Dual Hawk Tandem systems with 2-loop closing system. PN 103002
b) Purchased 2-loop closing system as an installation kit. PN 480055
c) Owners who have received additional 20.5” flex pins as replacements.
PN 780019
d) Received replacement Drogues. PN 480026
e) Sent gear to Strong for repair and received updated containers PN 099230
f) Sent a drogue to Strong for repair and received update PN 099418
AUTHORITY: Ted Strong, President, Strong Enterprises
PSB #500101
Service Bulletin #23, September 09, 1997
ITEM: Disconnection of the RSL
STATUS: Compliance optional.
IDENTIFICATION: Dual Hawk Tandem Systems: PN 103000
through 103005 (Dwg. No. 1151). All serial numbers.
BACKGROUND: Through the development of tandem jumping equipment, the integration
of an reserve lanyard system (RSL) has been both required and beneficial.
In recent years the addition of a Cypres AAD and since 1 November, 1994,
the requirement of the Cypres has made the requirement of an RSL less critical.
A recent tandem accident is in part attributed to the RSL.
SERVICE BULLETIN: Disconnecting the Dual Hawk Tandem RSL is
now authorized by Strong Enterprises. Complete removal of the RSL is not
necessary. Disconnect; the RSL by opening the shackle, removing the yellow
RSL webbing and folding it back up 3 to 4 inches under the Velcro¨ reserve
riser cover flap. It is important for Tandem Instructors that will be using
the Dual Hawk Tandem System with the RSL disconnected to review emergency
reserve procedures. Procedures should incorporate touching all handles
in sequence (drogue release handle, cut-away handle, reserve ripcord) as
soon as the drogue is deployed. This should be performed on each and every
tandem jump. It is also equally important that verification is performed
before each jump that the Cypres AAD unit is turned on.
QUALIFIED PERSONNEL: Equipment owner, Strong Enterprises Tandem
Instructor, Senior or Master Rigger or foreign equivalent.
COMPLIANCE DATE: Not applicable.
DISTRIBUTION: All Dual Hawk Tandem System owners on record,
national aero clubs, PIA, USPA, Parachutist, Skydiving, www.StrongParachutes.com.
#22, February 20, 1997
ITEM: A) Dual Hawk Tandem, Use of Unapproved
Components B) Dual Hawk Tandem Service Life
STATUS: Mandatory compliance.
IDENTIFICATION: Dual Hawk Tandem Systems; PN 103000 through 103005
(Dwg No. 1151 & 68E10001).
BACKGROUND: A) Strong Enterprises has determined that Dual Hawk
Tandem Systems with components not approved by Strong Enterprises present
a hazard that is not acceptable for tandem jumping. B) The rapid improvements
of the Dual Hawk Tandem System have shown considerable safety enhancements.
It is also evident that most systems older than eight years have considerable
wear and deterioration with loss of performance and could pose a threat
to the users.
SERVICE BULLETIN: A) Only components approved by Strong Enterprises
may be used on the Dual Hawk Tandem System for tandem jumping. B) All Dual
Hawk Tandem Systems shall have a service life of eight years from date
of manufacture or be returned to Strong Enterprises for reinspection and
recertification. It may then be placed back into service for five years.
This service bulletin does not change the requirements for periodic inspections
and maintenance as outlined in the FAA Exemption or manufacturers instructions.
DISTRIBUTION: All Dual Hawk Tandem System owners, national aero
clubs, PIA, USPA, Skydiving, Parachutist.
BULLETIN 22 EXPLANATION: Strong Enterprises has taken a proactive
step to ensure public safety and the safety of our certified tandem instructors
by issuing Service Bulletin 22 on 20 February 1997 (attached). The purpose
of Bulletin 22 is to assure that Dual Hawk Systems more than 8 years old
are still safe to use, and components that Strong Enterprises has not tested
or approved as being compatible are not being used in these systems. Dual
Hawk Tandem Systems that are not in compliance with Bulletin 22 are considered
by Strong Enterprises to be un-airworthy. Therefore, the TSO on that system
is void and any tandem jumps made on these systems are made in violation
of FAR 105.43 (a). Any Strong Enterprises certified tandem instructor who
enters into an aircraft with the intention of making a tandem jump, and
the Dual Hawk System he intends using on that jump is not in compliance
with Strong Enterprises Bulletin 22, has automatically voided his Strong
Enterprises tandem instructor certification and that jump will be made
in violation of FAR 105.43 (a) and Strong Enterprises' tandem exemption.
The appropriate FAA FSDO offices will be notified of the serial number,
location, and owner of all Dual Hawk Tandem Systems that are not in compliance
with Bulletin 22. In consideration of the liability exposure of USPA, a
copy of notices related to Bulletin 22 will be forwarded to USPA. Compliance
with Bulletin 22 is quite simple: 1. Use only manufacturer approved components
in your Dual Hawk system. 2. If a Dual Hawk system is more than 8 years
old, return it to Strong Enterprises for inspection, refurbishing if needed,
and recertification as airworthy. Recertified components are marked: 1.
Hrn/con.: Labels sewn on the horizontal back strap of the passenger hrn.,
inside the main container, and on the front left reserve riser. 2. The
main and reserve canopies: A label sewn onto the tail seam. Bill Morrissey
Tandem Program Director.
#21, March 22, 1996
ITEM: Dual Hawk Tandem Main Riser Replacement
STATUS: Mandatory to replace risers manufactured between 01 June 1994
and 31 July 1995. Recommended replacement of risers manufactured prior
to 01 June 1994.
IDENTIFICATION: Strong Enterprises Type VII main risers on Dual
Hawk Tandem systems: Part No. 834606 (Master 425 main); and Part No. 834607
(T-520 main) manufactured between 01 January 1994 and 31 July 1995.
BACKGROUND: Several users have reported middle rings that literally
broke (separated from the riser and were lost on opening), and several
that were deformed (either elongated or "potato chipped"). Investigation
revealed that our vendor (D.J. Assoc.) supplied middle rings which, although
dimensionally identical, were machined instead of forged, and therefore
not as strong. Visually, the two types may not be reliably distinguished
from each other.
SERVICE BULLETIN: All Strong Enterprises tandem risers manufactured
between 01 June 1994 and 31 July 1995 will be replaced (at no charge to
the owners) with new risers utilizing forged rings. The replacement risers
will be easily identified by their larger, heavy-duty rings (the larger
ring is approx. 1.165ä [300mm] ID and 0.180ä [60 mm] thick) and
the label will identify the riser as part no. 834608. Free replacement
riser sets are available from Strong Enterprises upon request as production
permits. Canopy serial number must be provided and the original risers
must be returned to Strong Enterprises. Strong Enterprises recommends that
all other tandem main risers manufactured before March 1996 be replaced
with the heavy-ring risers made after 01 March '96. As an inducement, Strong
will offer these new risers at $90.00 per pair until 01 Sept. 1996. QUALIFIED
PERSONNEL: Senior parachute rigger or foreign equivalent. COMPLIANCE
DATE: Before 01 September 1996.
DISTRIBUTION: DHT owners on record, national aero clubs, PIA, USPA,
Skydiving, Parachutist.
#20, May 04, 1995
ITEM: Stellar Reserve Canopy Recall
STATUS: Mandatory.
IDENTIFICATION: All Strong Enterprises Stellar ram-air reserve
canopies manufactured prior to 01 May 1995; these include part nos. 430120,
430140, 430160, 430180, 430200, 430220 and 430240.
BACKGROUND: The bonding on some suspension lines (not control lines)
may cause the lines to stick together. Although TSO "freeze and bake" environmental
tests were performed without problem, field experience has made us rethink
the use of this line.
SERVICE BULLETIN: All canopies will have their current lines replaced
with unbonded lines at no charge to the owner. Converted canopies will
have their data panels permanently marked "Service Bulletin 20 complied," and
bulletin compliance will be logged on the data card. You may elect either
of the following: (1) Return canopy prepaid to factory for line replacement;
we will reimburse shipping cost. We will include repack at no charge if
complete rig is sent. We will return canopy the same way you send it to
us (UPS, airfreight, etc.) or you may pay the difference to expedite delivery.
We anticipate 3 day turn-arounds. "OR" (2) Free replacement line sets and
instructions are available from Strong Enterprises upon request (with serial
number). We will reimburse owner $100 upon receipt of satisfactory evidence
of installation and repack.
QUALIFIED PERSONNEL: Master parachute rigger or foreign equivalent.
COMPLIANCE DATE: By June 10, 1995.
DISTRIBUTION: Owners on record, national aero clubs, FAA, PIA,
USPA, Skydiving, Parachutist.
#19, November 01, 1994
ITEM: Dual Hawk Tandem Updates Manadated
STATUS: Mandatory.
IDENTIFICATION: Strong Enterprises Dual Hawk Tandem part no. 1165-4
(TSO label references SE assembly drawing No. 1151).
BACKGROUND: This bulletin mandates five updates that were previously
recommendations. SERVICE BULLETIN: Inspect all Dual Hawk Tandems
for compliance and unless previously updated, make the following changes
in accordance with instructions available from Strong Enterprises: (1)
Replace yellow-cable cutaway handle with breakaway drogue release PN 862020.
(Ref. 3/13/94 addendum to DHT Manual and Tandem Jumping #15, Feb. '94.)
(2) Change type VIII main risers to type VII main risers. (Ref. Tandem
News #14, March '93.) (3) Change reserve free bag from light blue bag with
nitrile O-rings or rubber bands to orange bag PN 730324 with bungee stows
and plastic chokers. (Ref. Tandem News #7, Jan. '91; NOTE: This bulletin
cancels Service Bulletin #10.) (4) Modify Master reserve canopies manufactured
prior to 10 Sept. 1990 by adding reinforcing tape across tail. Canopies
not previously updated will have stabilizers that stop about 1 1/2" short
of the tail, while updated units will have the stabilizers sewn directly
to the tail. (5) Install Cypres AAD. (Ref. Tandem News #12, May/June '92 & TN
#16, Aug '94.)
QUALIFIED PERSONNEL: Master parachute rigger or foreign equivalent.
COMPLIANCE DATE: Cypres installation by 01 July 1995; other four
items by 01 January 1995.
DISTRIBUTION: DHT owners/operators on record, national aero clubs,
PIA, USPA, Skydiving, Parachutist.
#18, May 26, 1994
ITEM: Reserve ripcords with Soldered Tips
On Cable Extensions
STATUS: Advisory.
IDENTIFICATION: Two-cable reserve ripcords, Part No. 611290S (Martin-Baker
handle) or 613290S (Mini-Dee handle), with cables extending beyond the
pin designed for use Automatic Activation Devices. This bulletin applies
only to those cables that have the tip of the cable extension soldered,
and does not apply to those cables with electrically fused tips nor to
those that have ball swages on the tips. These ripcords are generally used
with with large-hole Y-adapters and may be found on Strong Enterprises
Mini-Hawk/Student Hawk, part no. 1165-3 (referenced inside the reserve
cover flap as assembled in accordance with SE drawing no. 1152).
BACKGROUND: To be compatible with AAD's, the original reserve ripcord
design was reconfigured with cables that extended beyond the tip of each
pin and terminated with a ball swage. This was later manufactured without
the ball, using solder to seal the cut ends of the steel cables. The process
of de-greasing, fluxing, soldering and cleaning the cable may cause accelerated
oxidation which may cause increased friction between the ripcord pin and
the closing loop resulting in excessive pull force requirements, ie, "hard
pulls."
SERVICE BULLETIN: Visually inspect the last 2 inches of each cable
for signs of corrosion. If any is found, wipe clean with cloth rag. If
owner desires, Strong Enterprises will, prior to 01 January 1995, exchange
original ripcord with new electrically severed unit (exempt from this bulletin)
at no charge beyond the inbound shipping.
QUALIFIED PERSONNEL: Senior or Master parachute rigger, or owner.
COMPLIANCE DATE: Inspect at each reserve repack.
DISTRIBUTION: Registered owners, PIA, USPA, Skydiving, Parachutist.
#17, March 11, 1994
ITEM: StiffinerTo Reinforce CYPRES AAD
STATUS: Recommended.
IDENTIFICATION: Strong Enterprises Dual Hawk Tandem, part no. 11
65-4 (TSO tag references S. E. assembly drawing 1 1 51), which have an
Airtec CYPRES automatic actuation device installed.
BACKGROUND: At a local drop zone, a Tandem Cypres was nonfunctional.
In repacking the reserve, the Cypres was found to be broken in half. The
drop zone has three Dual Hawks with Cypreses that have been in service
for two years. Their other units were fine. It is believed that pressure
and vibration from the harness backstraps under the reserve stressed the
casing. We have found cracks may occur on either side of the case on the
mold line where the three sections of the case join, or separation may
occur along this mold line. Some new, unused units have been found to have
cracks in the casing, one crack occurred while putting a new Cypres into
its pocket. According to Airtec, the metal casing inside the plastic casing
was slightly too big on some units, but the problem has been resolved.
SERVICE BULLETIN: Visually inspect the Cypres case for cracks.
According to Airlec, if the crack is not too bad, you can leave it like
it is and continue using the unit--the crack does not affect the function
and safety of the unit. Reinforce units with a stiffener supplied by Strong
Enterprises: Position stiffener plate over the data panel of the Cypres
and wrap photographer's "gaffer's tape" or duct tape (or equal) tightly
around the stiffener and AAD at both ends of the stiffener (across the
width of the Cypress).
QUALIFIED PERSONNEL: Senior or master parachute rigger or foreign
equal. COMPLIANCE DATE: At next reserve repack.
DISTRIBUTION: DHT owners, Tandem Newsletter, PIA, Parachutist,
Skydiver Magazine.
#16, JULY 15, 1992
ITEM: Specific Tandem 3-D Rings Grounded
STATUS: Mandatory. Affected 3-D rings must be replaced
by Strong Enterprises before next jump.
IDENTIFICATION: Instructor harnesses of following Dual Hawk Tandem
Systems, PN 1165-4 (Ref: assembly drawing 1151): Serial numbers 107067-206098
Manufactured between July 1991-June 1992. Except those with replaced rings
which have a lot number stamped on the front of the 3-D ring.
PROBLEM BACKGROUND: We have discovered two 3-D Rings from this
lot of hardware that deformed because they were not hardened (tempered)
properly. As a matter of precaution, we will replace the 3-D rings on the
affected Dual Hawks.
REQUIRED ACTION: Check serial number and date of manufacture. Stop
using the affected equipment immediately. Remove the handles and reserve.
Send the harness/container assembly to Strong Enterprises prepaid. The
replacement of the rings and shipping both ways will be free of charge
if returned to Strong Enterprises by October 1, 1992. We will return equipment
via the same carrier and priority. We anticipate a turn-around time of
2 weeks maximum.
AUTHORITY: Address all inquiries to our Tandem Department.
DISTRIBUTION: Registered owners by serial number, DHT Examiners,
parachute publications, FAA.
#15, January 08, 1992
ITEM: Drogue Bridle Reinforcement Stitching
STATUS: Mandatory.
IDENTIFICATION: Strong Enterprises main drogue, part no. 480016,
serial numbers: 109809-109917, manufactured Sept. 1-Dec. 24, 1991, and
those that have had factory drogue canopy or bridle replacements during
the same time period.
BACKGROUND: We have experienced one in-flight drogue failure resulting
in main pack closure, with successful reserve ride. SERVICE BULLETIN: Add
two rows of ziz-zag stitching at top of kevlar bridle, per attached drawing.
QUALIFIED PERSONNEL: Owner, senior, master parachute rigger or parachute
loft.
COMPLIANCE DATE: Immediately, prior to next jump.
DISTRIBUTION: Specific DHT owners of record, customers.
#14, November 14, 1991
ITEM: Tandem Main Riser Damage
STATUS: Required.
IDENTIFICATION: Strong Enterprises main risers, made of type VIII webbing, on Dual Hawk Tandem systems installed on: Master main canopy, part no. 410064,(prior to serial number 495, manufactured August 25, 1991); or T-500/T-520 main canopies, part no. 410076/410075 (prior to serial number 112, manufactured August 25, 1991).
BACKGROUND: Over the last four months Strong Enterprises has received
notification of several main risers failing. The manufacturing dates on
these risers span several years. All failures have occurred at the toggle
pocket location on the rear riser. SEE SKETCH: Because neither age nor
number of jumps is a reliable gauge, it is not possible to determine ahead
of time when a failure might occur.
SERVICE BULLETIN: Please notify us by returning the enclosed postcard
with the information requested . Upon receipt of this information we will
send you a new pair of main risers so you can exchange them with the pair
presently on your canopy. The old pair needs to be returned to Strong Enterprises.
QUALIFIED PERSONNEL: Senior or Master parachute rigger or parachute
loft. COMPLIANCE DATE: Required compliance by January 2, 1992.
DISTRIBUTION: Dual Hawk Tandem owners.
#13, July 09,1991
ITEM: Defective Slider Stops
STATUS: Mandatory.
IDENTIFICATION: All ram-air main and reserve parachute canopies
manufactured by Strong Enterprises prior to July 1, 1991.
BACKGROUND: A total of three canopies have been reported with slider
stops "out of round" i.e. having a flat side, potentially allowing a slider
grommet to pass over the stop and hang up causing a streamer malfunction.
SERVICE BULLETIN: This is a one-time inspection. Unpack the canopy
and use your fingers to feel the slider stop discs (six per canopy) at
the lower edge of the stabilizer panels, Any disc with a detectable "flat" side
must be replaced and reported to Strong. Free replacement stops are available
upon request (with serial number). Permanently mark the outside of each
slider stop pocket with "INSP" or similar, and log bulletin compliance
on the data card.
QUALIFIED PERSONNEL: Reserve canopy: Senior or Master parachute
rigger with back rating or parachute loft with canopy rating; must log
inspection compliance on data card. Main canopy: Owner or rigger. COMPLIANCE
DATE: Immediate; prior to next jump.
DISTRIBUTION: USPA, PIA, Skydiving, Parachutist, Para Newsbrief,
Tandem Newsletter, Strong Dealers, USPA affiliated Drop Zones, Tandem Owners.
#12, December 07, 1990
ITEM: Dual Hawk Drogue Bridle Pin Location
IDENTIFICATION: Six-gore drogue part no. 480016 with 1 1/2-inch
wide Kevlar bridle, manufactured before November 1990; used on Strong Enterprises
Dual Tandem Hawk. This bulletin does not affect the Student Hawk solo drogue,
PN 480017.
BACKGROUND: Pin too close to ring may cause premature openings;
pin too close to bag creates potential for drogue-in-tow.
SERVICE BULLETIN: Measure the distance from the confluence wrap
to the eye of the pin (Dimension A on attached drawing). Also measure the
distance from the eye of the pin to the close edge of the forged ring (Dimension
B). If Dimension A is 3 inches (76 mm) or more and Dimension B is 15 inches
(380 mm) or more, then continue to use drogue "as is." If Dimension A is
more than 3 1/8 inches (79 mm) and Dim. B is less than 15", move the type
IV tape and pin toward the "bag" end of the bridle so Dimension A is 3
inches - 0, +1/8 (76-79 mm). Note that Dimension B may be less than 15
inches (380 mm) after modification; this is acceptable. Mark "-2" and the
date of modification on the underside of the type IV tape to indicate compliance. QUALIFIED
PERSONNEL: Master parachute rigger or parachute loft.
COMPLIANCE DATE: Inspection is recommended prior to next jump;
modification, if necessary, should be accomplished within 120 days.
AUTHORITY/FFI: Bill Morrissey Tandem Department Strong Enterprises
11236 Satellite Blvd. Orlando, FL 32837 Tele. (407) 859-9317 FAX (407)
850-6978
DISTRIBUTION: Tandem Owners, Tandem News.
#11, May 16, 1988
ITEM: Dual Hawk Tandem Drogue Riser
PROBLEM: If the hook velcro on the drogue riser protector flap is
facing towards the cables, then any unmated portion of the hook velcro
could catch on the ends of the cloth through loop.
We have found that even a small amount of tension from the hook velcro
can prevent the release of the rings and drogue.
NORMAL CONFIGURATION: When the ripcord protector flap is closed
over the ripcord cables, the hook velcro should be facing away from the
cables.
SOLUTION: For any drogue risers found with the hook velcro facing
towards the ripcord cables, remove the velcro and reinstall it with the
hook facing away from the ripcord cables when the ripcord protector flap
is closed. If it is not possible to change the velcro before the next jump,
then when inspecting the ripcord cables, make sure the protector flap velcro
is completely mated. |
