Senior Airman Rafael Cratch (Right), with the 46th Maint.
Group, rigs a GBU-12 in preparation for a weapon lanyard
test for the F-35 System Development and Demonstration
6/17/2008 - EGLIN AIR FORCE BASE, FL -- The 46th Test Wing
recently lent a hand to Lockheed Martin Company to perform a
risk reduction and development test of weapon lanyards for the
F-35 System Development and Demonstration program at the Simulated
Environment for Munitions facility here.
The tests began March 25 and were performed by the 46th Test
Wing's 46th Operations Group, 780th Test Squadron, Air-to-Surface
Test Flight, Weapons Test Branch, as well as
Lockheed Martin, the prime contractor responsible for the design,
development, test and production of the F-35 family of aircraft.
The purpose of the test series was to demonstrate flight test
suitability of the lanyard configurations that were developed
for the weapons carried in the F-35 weapon bays during the SDD
program. If not, the tests determine if alternate lanyard configurations
or components are required for further development.
Lockheed Martin is developing a conventional take-off and landing
(CTOL) F-35 version for the Air Force, a short take-off and
vertical landing (STOVL) version for the Marine Corps and a
carrier variant (CV) for the Navy.
All variants have the capability of internal carriage of weapons
in the two weapon bays. Each weapon bay has two weapon stations,
an air-to-ground weapon station and an air-to-air weapon station.
At the STEM facility, BRU-67 and -68 series racks were used
to eject inert stores into the pit at the static ejection test
facility. The racks were developed specifically for the F-35
"Unlike legacy aircraft racks that use explosive charges
to eject the store, the F-35 racks use a pneumatic power source
to power the eject pistons," said suspension and release
equipment and design lead Jim Shelingoski, F-35 Weapons Integration
IPT, 685th Armament Systems Squadron.
The BRU-67 is carried in the weapons bay of the STOVL aircraft
at the two air-to-ground store carriage locations. The BRU-68
is carried in the weapons bay of the CTOL and CV aircraft.
"The BRU-67 and -68 are new designs that include a sway
brace mechanism that is integral to the ejection pistons,"
said joint technical data lead Ken Gibson, F-35 Weapons Integration
IPT, 685th ARSS. "For the lanyards that are routed in close
proximity to the ejection pistons and sway braces, we want to
make sure the lanyard designs are compatible with the racks
during operation and do not foul with the sway braces."
Munitions used during the test included the GBU-31(V)1/B, GBU-31(V)2/B,
GBU-31(V)3/B, GBU-32(V)2/B and GBU-12D/B. Evaluators tested
lanyards that activated the FZU-32, FZU-48 and FZU-55 on the
various munitions, the FMU-143 on the BLU-109 version of JDAM
and the Battery Firing Device and Wing Release Lever on the
For each munitions store in the test matrix, evaluators tested
a primary, preferred design and an alternate, back-up design.
"This testing represents a big step in risk reduction
of the F-35 weapon lanyard configurations," said lanyard
test manager Jeanna Roti, F-35 Weapons Integration IPT, Lockheed
Martin Aeronautical Company. "A successful outcome allows
us to go to flight test confident that lanyards will function
Source: USAF Eglin AFB Press Release by Rick Phillips