Service difficulty report · Proximity Sensor · Boeing 7378

Difficulty date
July 17, 2025
Submitted
July 21, 2025
Operation
Air carrier
Aircraft
N47370
Make and model
Boeing 7378
Aircraft serial
68823
Aircraft time
578 hours, 195 cycles
Part
Proximity Sensor
Part number
8020702
Condition
Faulted
Location
Slat Sys
Stage of operation
CL
How discovered
O
Nature of condition
J
Precautionary procedure
A

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

What was found

FLAPS LE TRANS LIGHT DID NOT GO OUT ON DEPARTURE W FLAPS UP. SLATS NR 8 LIGHT WAS ON. LE SLAT 8 INBOARD SENSOR SIGNAL DOES NOT AGREE WITH OTHER LE SLAT INBOARD SENSOR SIGNALS. MAINT MSG 27-81215. CAPTURED ON 6 OF LAST 7 LEGS. CYCLED FLAPS AND COULD NOT REPLICATE TRANS LIGHT FAULT. NO LATCHED MESSAGE FOUND. FAULT HISTORY GIVES MX MESSAGE 27-81215. FIM 27-81 TASK 821 AND AMM TASK 27-88-11-700-801 INITIAL EVALUATION NR 8 SLAT LIGHT WENT OUT BUT LAGGED AFTER SLAT STOWED. RANG WIRES FROM NR 8 INBOARD SENSOR S1009 TO FSEU REF WDM 27-81-22. VERIFIED INTEGRITY OF GD4130AC. WIRE AND GND CHK OK. BOTH TARGETS ARE SOLID. REPLACED S1009 REF AMM 27-88-11/401. NR 8 SLAT SENSORS CHK OK REF AMM TASK 27-88-11-700-801. INDICATION NOW RESPONSIVE TO POSITION.

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