Service difficulty report · Switch · Boeing 7572Q8

Difficulty date
January 6, 2021
Submitted
January 12, 2021
Operation
Air carrier
Aircraft
N993FD
Make and model
Boeing 7572Q8
Aircraft serial
24965
Aircraft time
62,657 hours, 23,951 cycles
Part
Switch
Part number
31HE1026
Condition
Damaged
Location
Slat System
Stage of operation
CR
How discovered
O
Nature of condition
F, S
Precautionary procedure
O

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

What was found

AT CRUISE WE RECEIVED AN EICAS MESSAGE LEADING EDGE SLAT ASYM EMERGENCY DECLARED. PER FIM/27-81 F/T 804 FOUND AND WDM 27-81-31. RANG OUT SLAT LOSS SENSING SWITCHES FROM FSEU TEST RECEPTICLE D1251 AND FOUND ALL SWITCHES READING OPEN. FSEU 1 FAULTED SLAT LOSS 317 R & R FSEU NR 1, REF/AMM 27-51-01-2. FAULTS CLEARED AND FLAPS/SLATS OPERATE FLAPS/SLATS OPERATE NORMAL AT THIS TIME. OPERATIONAL TEST ON FSEU NOT COMPLETE. MOCC REQUEST INSPECTION OF SLAT LOSS SWITCHES AND WIRING. REMOVED FSEU 1 & 2, FOUND HI RESISTANCE SHORT TO GROUND AT PIN G9 IN THE D3258A CONNECTOR WITH MEGGER AT FSEU 2. REMOVED CONNECTOR D41381 AND MEGGED PIN G9 IN D3312A CONNECTOR, NO FAULTS NOTED. ISOLATED PROBLEM TOI RIGHT WING SWITCHES. DISCONNECTED CONNECTOR D41396P AND MEGGED PIN 11 IN THE J SIDE OF THE CONNECTOR, NO DEFECTS NOTED. RECONNECTED CONNECTOR D41396P. VERIFIED FAULT BETWEEN FSEU 2 AND CONNECT D41396. SUSPECT RT INBOARD SWITCH S10588. REMOVED AND REPLACED RT INBOARD SLAT LOSS SENSING SWITCH (S10588) AND LEVER ARM, IAW AMM 27-81-41-4. OPERATIONS CHECK NORMAL, PER AMM 27-81-41-4. A/C OK FOR SERVICE.

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