What was found
CABIN EMERGENCY LIGHTS COME ON WHEN COCKPIT SWITCH IS ARMED. *S/D* CAUSED BY 400HZ NOISE PICKED UP ON THE CONTROL LINES FOR THE EMERGENCY LIGHTS. CORRECTIVE ACTION WILL BE ADDING TERMINATION RESISTORS TO THE LINES PER COA 8-4608.
- Difficulty date
- December 13, 1997
- Submitted
- March 26, 2000
- Operation
- Air carrier
- Aircraft
- N4723U
- Make and model
- Boeing 747122
- Aircraft serial
- 19882
- Engine
- Pwa JT9D7A
- System (JASC)
- 3350 · Emergency Lighting
- Part
- Lights
- Condition
- Malfunctioned
- Location
- Cabin
- Stage of operation
- NR
- Nature of condition
- L
- Precautionary procedure
- K
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.