BB-E-2879A
4.5.1 Assembly. The fire extinguisher assembly shall be inspected for conformance to the
dimensions on figure 1.
4.5.2 Cylinder retention and fragmentation resistance. The cylinder retention and
fragmentation resistance shall be verified by shooting fully charged cylinders with a 0.30 caliber
armor piercing cartridge, M2, at a projectile muzzle velocity of 2,765 feet/second. Unless
otherwise specified by the test facility, the cylinder shall be mounted in its bracket, which shall be
securely mounted using its mounting hardware, at a distance of 20 ±5 feet from the gun muzzle,
and then impacted with fully tumbled projectiles. The cylinder shall be supported and constrained
by its normal latch and bracket during the test. The test shall be conducted at ambient
temperature. A separate cylinder and mounting bracket shall be used for each test, as follows:
a. With the longitudinal axis of the cylinder normal to the line of fire.
b. With the longitudinal axis of the cylinder 45 degrees from normal toward the gun
position and the outlet port (neck) of the cylinder facing away from the weapon.
c. With the longitudinal axis of the cylinder parallel to the line of fire with outlet port
(neck) facing away from the gun.
d. With the longitudinal axis of the cylinder normal to the line of fire. The fully tumbled
projectile shall penetrate through the back of the bracket.
4.5.3 Crash retention. Using a separate bracket for each direction, the assembly shall be
subjected to a static loading of 50 times its weight in the downward, upward, lateral, and forward
directions.
4.5.4 Salt fog. The fire extinguisher and bracket assembly shall be exposed to 500 hours salt
fog in accordance with ASTM-B117. Upon removal from the salt fog chamber, the assembly
shall be examined for conformance to the requirements of this specification (see 3.8).
4.5.5 Vibration. Vibration testing of the fire extinguisher and bracket assembly shall be
performed in accordance with UL154.
4.5.6 Rough usage. Rough usage testing shall be in accordance with UL154, except that the
fully charged extinguisher shall be pressure checked before dropping.
5. PACKAGING
5.1 Packaging and preservation. Unless otherwise specified in the contract or purchase
order, this item shall be packaged in accordance with ASTM-D3951 or MIL-STD-2073-1,
level B or C.
5.2 Marking. Unless otherwise specified in the contract or purchase order, this item shall be
marked in accordance with FED-STD-123 or MIL-STD-129.
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