4.5.5 Forty foot drop test. Five warheads shall be subjected
to the forty foot drop test as specified in MIL-STD-331, Test
103.1, Procedure 1 (Substitute warhead for fuze) for first article
testing only. The warheads shall be assembled to MK66 Mod 1
inert-loaded motors and packed in accordance with MIS-30862. One
test round shall be packaged with three dummy rounds in each box.
4.5.6 Leakage test. Six warheads shall be subjected to the
leakage test per MIL-STD-810 Method 512.1 Procedure I for first
article testing only. The criteria for failure shall be water
entry into the cargo compartment of the warhead.
4.5.7 Charge circuit continuity. The warhead shall be
subjected to a charge circuit continuity test. Any warhead which
is identified as defective shall be removed from the lot or sample
and held for failure analysis or rework. An open circuit
continuity failure may indicate that the safety and arming device
is armed; any warhead with this type of defect should be handled
with appropriate safety precautions. The test shall be conducted
using Government approved equipment and procedures
4.5.8 Ballistic test. The tactical requirement for the
warhead is to provide proper delivery of M73 grenades into target
areas from 1000 to 6000 meters from the launching helicopter.
Performance shall be evaluated by ground launching a sample of 36
M261 warheads, assembled with MK66 Mod 1 motors, from any of the
compatible launchers into a permanently contaminated field.
Twelve warheads shall be conditioned at -50°F ± 5°F, 12
warheads at +70°F ± 15°F and 12 warheads at +160°F ± 5°F
for a minimum of 8 hours. Firing and fuze charging shall be
accomplished by a Government approved Ballistic Firing Test set
using fuze time settings of 2.0 seconds to achieve an airburst
range of about 1000 meters. Warhead samples shall contain a dye