SDR CALA2013082990850

Service difficulty report · Relay · Boeing 757222

Difficulty date: August 29, 2013
Submitted: August 30, 2013
Operation: Air carrier
Aircraft: N550UA
Make and model: Boeing 757222
Aircraft serial: 25398
Aircraft time: 81,930 hours, 23,677 cycles
Engine: Pwa PW2037
System (JASC): 4960 · APU Controls
Part: Relay
Condition: Faulty
Location: Apu Inlet
Stage of operation: IN
How discovered: O
Nature of condition: O
Precautionary procedure: K

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

What was found

AUXILIARY POWER UNIT DOOR STATUS MESSAGE AFTER AUXILIARY POWER UNIT STARTED AFTER LANDING. VERIFIED THAT DOOR DOES NOT BIND. DOOR OPERATIONS CHECKED OK. ERASED BITE MEMORY. REPLACED RELAY K 176 AUXILIARY POWER UNIT INLET DOOR RELAY IAW WWDM 49-61-14. OPERATIONS CHECKED GOOD.