Rev. D January 27, 2020
12
Manual Number 9018252
3.3.2
POWER AND SIGNALS
Wire aircraft power and aircraft ground according to the associated ACU pins in the Pinout
Diagram. Annunciation signals should be wired from the appropriate system inputs and
outputs to the associated ACU pins in the Pinout Diagram.
If an over temperature condition exists, pins 22 and 23 will be tied together with a 100Ω
series resistance. This output signal can be utilized as a battery over temperature indicator
to other systems in the aircraft. The TEMP annunciation will be lit in this condition.
3.3.3
HARNESS VERIFICATION
With the MD41 ACU disconnected, turn on the avionics master switch and use a volt-meter
(multimeter) to verify that aircraft power and panel lighting bus power is on the appropriate
pin(s) with appropriate voltage. Also verify that aircraft ground is applied to the appropriate
pins.