MIL-PRF-24021 Electric Power Monitors, External, AircraftThis specification covers electric power monitors which are installed in aircraft to monitor external electric power to prevent power outside the limits of this specification from being applied to equipment in the aircraft.

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MIL-PRF-24021K

4.4.1 Functional inspections.

4.4.1.1 Input power to AC monitors. The AC monitor shall be tested using an AC power

source having the characteristics specified in 3.4.1.1. The AC monitor shall not be damaged and

shall not reset automatically when the input power conditions specified in 3.4.1.1 are applied to the

monitor.

4.4.1.2 Input power to power lead (pin G) and sense lead (pin B). The DC monitor shall be

tested using a DC power source having the characteristics specified in 3.4.2.1. The DC monitor

shall not be damaged and shall not reset automatically when the input power conditions specified in

3.4.2.1 are applied to the monitor.

4.4.1.3 Inhibit voltage at pins C and E test. The DC monitor shall be tested during application

of an inhibit voltage having the characteristics specified in 3.4.2.2. The performance specified in

3.4.2.2 shall be met.

4.4.1.4 AC monitor including source of DC for contactor test. The specified output current

capacity of the M24021-3 monitor shall be tested by applying loads to the monitor corresponding to

the currents and time duration specified in 3.4.3.1. The performance specified in 3.4.3.1 shall be

met.

4.4.1.5 AC monitors excluding power supply test. The specified output current capacity of the

M24021-5 monitor shall be tested by applying loads to the monitor corresponding to the currents

and time duration specified in 3.4.3.2. The performance specified in 3.4.3.2 shall be met.

4.4.1.6 Current capacity of DC monitors. The specified output current capacity of the

M24021-6 monitor shall be tested by applying loads to the monitor corresponding to the currents

and time duration specified in 3.4.3.3. The performance specified in 3.4.3.3 shall be met.

4.4.1.7 Operation of AC monitors test. Operation of the AC monitors shall be tested in

accordance with and meet the requirements of 3.4.4.1.

4.4.1.8 Operation of DC monitors test. Operation of the DC monitors shall be tested in

accordance with and meet the requirements of 3.4.4.2.

4.4.2 General environmental service conditions. After subjected to the environmental test

requirements of MIL-E-81910, the external power monitor shall meet the requirements of 3.4

where applicable.

4.4.2.1 Sand and dust test. After subjected to the dust test of MIL-E-81910, the external

power monitor shall meet the requirements of 3.4.