MIL-PRF-62439B(AT)
3.5.3 Gun firing shock resistance. The assembly shall operate as specified in 3.4 during
and after exposure to shocks of 55±5.5 g for 2.5±0.2 milliseconds (ms) duration half sine wave
in each direction of three mutually perpendicular axes (see 4.5.4.3).
3.5.4 Ballistic shock resistance. The assembly shall operate as specified in 3.4 after
subjection to shocks of 200±20 gravity units (g) for 0.5±0.1 ms duration half sine wave in each
direction of three mutually perpendicular axes (see 4.5.4.4).
3.5.5 Basic shock resistance. The assembly shall operate as specified in 3.4 during and
after exposure to shocks of 20±2 g for 18 ms duration half sine wave in each direction of three
mutually perpendicular axes (see 4.5.4.5).
3.5.6 Vibration resistance. The assembly shall operate as specified in 3.4 during and
after subjection to the peak vibration envelope of figure 2 in each of three mutually
perpendicular axes. The vibration shall be imposed at a logarithmic sweep rate of 20 minutes per
sweep cycle from 5 to 500 to 5 Hertz (Hz) (see 4.5.4.6).
3.5.7 Submergence. The assembly shall operate as specified in 3.4.9 and 3.4.10 to
regulate the required fuel flow rate and the flow and pressure to the PTS (3.4.9) and IGV (3.4.10)
servo valves when subjected to a water submergence of 6 feet (ft) (see 4.5.4.7).
3.5.8 Sand and dust. The assembly shall operate as specified in 3.4 during and after
exposure to a sand and dust environment (see 4.5.4.8).
3.5.9 Fungus. The assembly shall operate as specified in 3.4 after exposure to conditions
favorable to fungus growth. Unless otherwise specified (see 6.2), these conditions shall be as
defined in IPC TM-650 2.6.1 (see 4.5.4.9).
3.5.10 Electromagnetic interference and compatibility. The assembly shall be capable of
meeting the emission and susceptibility requirements of MIL-STD-461, Tests CE101, CE102,
CE106, CS101, CS114, CS116, RE102 and RS103 (see 4.5.4.10).
3.6 Endurance and reliability.
3.6.1 Endurance. The endurance of the assembly shall be based on satisfying the
performance requirements of 3.4 after 350 hours of operation (see 4.5.4.11 and 6.2) in
accordance with the fuel flow schedule of figure 3 and the duty cycle of figure 4.
3.6.2 Reliability. The reliability of the assembly shall be demonstrated based on
achieving the mean time between failures in hours (MHBF) listed below upon completion of
endurance operations (see 4.5.4.11 and 6.2). The MHBFs shall be calculated by dividing the
total endurance operating hours by the number of reliability failures defined below:
a. 10 000 MHBF for failures causing loss of total fuel schedule
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