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|  MIL-P-5238C
3.6.2 Electrical. The electrical equipment shall satisfactorily operate on
power in accordance with the air vehicle requirements. The minimum require-
ments shall be in accordance with MIL-STD-704.
3.6.2.1 Wiring. All wiring shall be fuel resistant, and, other than windings,
shall be in accordance with MIL-W-5088.
3.6.2.2 Electrical fault containment. The pump assembly housing shall be
completely capable of containing any internal fault without failure of the
housing. in no case shall an electrical short or internal explosion propagate
to the outside of the housing or generate an unsafe condition. Thermal pro-
tection shall be incorporated to assure that the electric pump assembly is
maintained within safe temperature limits under all operating or non-operating
conditions. The peak temperature for any portion of the outside of the assembly
or as required in the detail
due to electrical heating, shall not exceed
specification.
3.6.2.3 Vent. A vent connected to the electrical motor chamber shall not
be connected to the seal drain chamber and shall incorporate a flame arrestor.
3.6.2.4 Electrical insulation resistance. The electrical components shall
withstand, without damage, breakdown, or excessive leakage current, repeated
applications of AC dielectric test voltage in accordance with the test pro-
cedure of Section 4. The insulation resistance shall not be less than 100
megohms when exposed to 500 volts DC. The dielectric leakage current shall
not exceed 2 milliamperes.
3.6.2.5 Electromagnetic compatibility. The equipment shall comply with the
requirements of the air vehicle and the applicable requirements of MIL-E-6051.
3.6.3 Inlet. The inlet to the pump shall be enclosed by a screen no coarser
than 8 mesh and no finer than 20 mesh. The flow area shall be sufficient to
permit maximum flow with 50 percent of the area blocked when operating at
maximum altitude.
3.6.3.1 Suction feed. The rate of flow and pressure drop under suction feed
shall be in accordance with the detail specification.
3.6.4 Pump drain. A chamber, incorporating a drain port, shall be provided
between the shaft seals for the motor and the pump to isolate leakage. The
drain port configuration and the allowable leakage shall be in accordance
with the detail specification. Wherever the motor and pump are integral and
shaft seals are not used this requirement does not apply.
3.6.5 Threaded connections. Threaded connections shall comply with MIL-T-7742,
MIL-S-8879, MS16142 or MS33649 as applicable.
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