MIL-PRF-24021K
3.2.1 Metals.
3.2.1.1 Corrosion resistance. Materials shall be corrosion resistant or processed to withstand
the environmental test requirements of MIL-E-81910.
3.2.2 Toxicity and fire resistance. Non-metallic materials used shall be flame resistant, shall
not support combustion, and shall be nontoxic when exposed to flame as well as when used under
all operating and environmental conditions herein (see 3.5).
3.3 Performance and interface characteristics.
3.3.1 Mean flight hours between failure (MFHBF). While operating under specified
conditions, the minimum MFHBF for the power monitor shall be 10,000 hours for its first 5.5 years
of service life, including storage.
3.3.2 Maintainability. The electric power monitor shall meet the requirements of this
specification for its complete 5.5 year service period, without the need for any routine servicing or
maintenance actions. The monitor shall not include any provision for disassembly or inspection.
3.3.3 Repairability. The electric power monitor shall be non-repairable. The monitor shall be
designed and constructed to hinder disassembly or access to internal components.
3.3.4 Adjustments. No provisions for external adjustments shall be provided and no
adjustment or alignments shall be required during installation of any power monitor. All
adjustments shall be made at the time of manufacture or when a monitor is being restored to a like
new condition. If devices for making adjustments are installed within a monitor, means for locking
and sealing shall be provided.
3.3.5 Electron tubes. Vacuum or gas filled electron tubes shall not be used.
3.3.6 Capacitors. Wet slug tantalum capacitors shall not be used.
3.3.7 Threaded parts. All internal or external parts which are threaded shall be positively
locked. Accidental loosening of threaded parts shall be prevented by self-locking nuts, safety
wiring, or other methods. Stacking shall not be used.
3.3.8 Moving parts. The monitor shall be a completely static solid-state device having no
moving parts except that one electro-mechanical relay may be used for controlling the AC or DC
power to operate the external power contactor.
3.3.9 Color. The monitor shall be finished in accordance with FED-STD-595, color number
17875, or equivalent.
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