MIL-PRF-24021K
a. DO NOT DISASSEMBLE
b. NON-SERVICEABLE, NON-REPAIRABLE
c. Electric Power Monitor, External, Aircraft
d. Voltage and Frequency (as applicable)
e. Specification MIL-PRF-24021
f. Part or Identifying No. M24021-X
g. Manufacturer
h. Manufacturer's Part No.
i. Serial Number
j. Order or Contract Number
k. National Stock Number
3.9.1 Precautionary note. The following information shall be printed on the top or on a decal
attached to the top (surface opposite the mounting surface).
On AC monitors the note shall read:
CAUTION: IF EXTERNAL POWER CANNOT BE APPLIED TO THE AIRCRAFT,
CHECK FOR ACCEPTABLE EXTERNAL POWER LIMITS BEFORE REMOVING AND
REPLACING THIS ELECTRIC POWER MONITOR. EXTERNAL POWER MUST BE
WITHIN THE FOLLOWING LIMITS FOR THE MONITOR TO OPERATE AND TO
PREVENT POSSIBLE DAMAGE TO AIRCRAFT EQUIPMENT:
Voltage: 113 to 118 volts per phase
Frequency: 393 to 407 Hz
Phase Sequence: A-B-C
On DC monitors, the note shall read:
CAUTION: IF EXTERNAL POWER CANNOT BE APPLIED TO THE AIRCRAFT,
CHECK FOR ACCEPTABLE EXTERNAL POWER LIMITS BEFORE REMOVING AND
REPLACING THIS ELECTRIC POWER MONITOR. EXTERNAL POWER MUST BE 24.0 TO
29.0 VOLTS TO OPERATE THIS MONITOR AND TO PREVENT POSSIBLE DAMAGE TO
THE AIRCRAFT EQUIPMENT.
The notes shall be legible, prominent, and permanent. The word CAUTION shall be in all capital
letters and not less than one-half inch tall. The rest of the information shall be all capital letters and
not less than one-eighth inch tall.
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