Operating instructions

TM 11-5865-229-12
b. Knob Replacement.
Perform the following procedure to replace CCU knobs.
Make sure system power is off. Refer to aircraft manual for instructions.
Note position of knob. This will help you position replacement knob correctly.
Loosen two set screws in base of knob with hex wrench and remove knob.
Be sure to dispose of old knob. If left in crew compartment,
it may cause flying object damage.
Install replacement knob. Make sure knob is in position noted in step 2.
Tighten two set screws with hex wrench until snug.
Refer to aircraft manual for instructions on securing the aircraft.
c. Lamp Replacement.
Perform the following procedure to replace CCU lamps.
The CCU front panel display is powered by high voltage and can present a shock hazard if it becomes
cracked. Pry lamp assembly out of the switch carefully to avoid damaging this panel.
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