SDR UIEA2014031100101

Service difficulty report · Thermocouple · Boeing 7673S1

Difficulty date: March 10, 2014
Submitted: March 11, 2014
Operation: Air carrier
Aircraft: N640GT
Make and model: Boeing 7673S1
Aircraft serial: 25221
Aircraft time: 73,863 hours, 15,560 cycles
System (JASC): 4970 · APU Indicating System
Part: Thermocouple
Part number: 38760274
Part serial: 1115027701662
Condition: Faulty
Location: Apu
Stage of operation: IN
How discovered: C
Nature of condition: N
Precautionary procedure: K

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

What was found

EICAS MX MSG, APU BITE, LRU FAULTED NR 2 EGT CIRCUIT. PERFORMED APU BITE IAW 49-11 FAULT TREE 958 MINI FLAG 12, FAULTED LRU NR 2 EGT CIRCUIT. R & R RT SIDE THERMOCOUPLES POSITION TS7 UPPER & TS7 LOWER IAW AMM 49-71-01-401. SN OFF UPPER 1115027701662, SN ON UPPER 08-20219-04976, SN OFF LWR 11150277-01630 & SN ON LOWER 052021901452.

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