MIL-DTL-5882E
4.5.9 Reliability tests. The reliability test units shall be subjected to the following
combined environmental conditions:
a. Temperature: -55°C to +121°C or remotely mounted transmitters or -55°C to +190°C
for direct engine mounted transmitters.
b. Temperature cycling: Each temperature cycle shall be 8 hours in length. Following a
room temperature dwell of 30 minutes, the chamber temperature will be dropped over a period of
15 minutes to -55°C. Following a 3 hour, -55°C soak, the chamber temperature shall be raised
over a 45 minute period to the upper temperature range (+121°C or +190°C). The transmitter
shall remain at the high temperature over a period of 3 hours after which the temperature shall be
lowered to room temperature over a period of 30 minutes. This constitutes on cycle. This cycle
shall continue throughout the duration of the reliability tests, except for moments of equipment
shut down to assess transmitter performance.
c. Transmitter on-off cycling: The transmitters shall be off for 15 minutes out of each
high temperature and low temperature soak as well as during the 30 minute room temperature
period. The transmitters shall be on at all other times.
d. Pressure oscillations: The transmitters shall be subjected to input line pressure
oscillations at a frequency of 1 Hz from 20 ± 1 to 30 ± 1 psi. Pressure oscillations shall occur
whenever the transmitters are powered on. When the transmitters are powered off, the input line
pressure shall be 0 psi.
e. Vibration: Throughout the pressure cycling, for 10 minutes of each hour the
transmitters shall be subjected to sinusoidal vibration cycling in accordance with MIL-STD-
8l0C, method 514.2, using curve D for shock mounted transmitters or curve L for direct engine
mounted transmitters. At the end of 4 test cycles (32 hours) during the room temperature phase,
reorient the transmitters to another axis and continue testing.
f. Input voltage: Nominal specified voltage.
At the end of each 4 cycles, when the transmitters are being reoriented on the vibration stand, the
transmitters shall be scale error tested. Any transmitter which does not stay within the scale error
tolerances for endurance in Table I shall be considered a failure. No preventative maintenance
shall be performed. Lower test MTBF (O) shall not be less than 5000 hours. Accept - reject
criteria shall be in accordance with MIL-HDBK-78l, (for guidance only) test plan I.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as
specified in the contract or order (see 6.2). When packaging of materiel is to be performed by
DoD or in-house contractor personnel, these personnel need to contact the responsible packaging
activity to ascertain packaging requirements. Packaging requirements are maintained by the
Inventory Control Point's packaging activities with the Military Service or Defense Agency, or
within the military service's system commands. Packaging data retrieval is available from the
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