Service difficulty report · Relay · Cessna 680A

Difficulty date
May 16, 2023
Submitted
May 17, 2023
Operation
Air carrier
Aircraft
N503QS
Make and model
Cessna 680A
Aircraft serial
680A0040
Aircraft time
6,161 hours, 4,049 cycles
Part
Relay
Part number
MB353615022L
Condition
Faulted
Location
Zone 100
Stage of operation
TX
How discovered
C
Nature of condition
O
Precautionary procedure
O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

WITH THE EMER LTS ARMED AND THE PAX SAFETY SWITCH SELECTED OFF, THE CABIN EMERGENCY LIGHTS REMAIN ILLUMINATED. THE EMERGENCY LIGHTS EXTINGUISH PROPERLY WHEN THE EMER LTS SWITCH IS SELECTED OFF. ALSO, THE EMERGENCY LIGHT ABOVE THE MAIN CABIN DOOR ILLUMINATES INTERMITTENTLY WHEN THE PAX SAFETY SWITCH IS SELECTED ON WITH THE EMER LTS ARMED. PER MCC REQUEST COMPLIED WITH EMERGENCY LIGHTING POWER SUPPLY BATTERY EXERCISE PROCEDURE TC·FLT-33-1001 REV 2 DATED 200CT2022. FOUND NO DISCREPANCIES. DURING FURTHER TROUBLESHOOTING DUPLICATED THE ISSUE, FOUND THE RELAY KC007 TO BE INTERMITTENT, REF WD 33-50-01-02, REPLACED RELAY KC007 AT LH CB PANEL. EMERGENCY LIGHTS OPERATIONAL TEST IS SATISFACTORY IAW AMM 33-50-00,

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