SDR ASAA2015032511104

Service difficulty report · Apu · Boeing 737990ER

Difficulty date: March 25, 2015
Submitted: March 30, 2015
Operation: Air carrier
Aircraft: N471AS
Make and model: Boeing 737990ER
Aircraft serial: 41703
Aircraft time: 1,712 hours, 585 cycles
System (JASC): 4900 · Airborne Auxiliary Power Unit (APU) System
Part: Apu
Part number: 38007021
Part serial: P10482
Condition: Unknown
Location: Apu Bay
Part time: 1,712 hours, 585 cycles
Stage of operation: IN
How discovered: 9
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

ENGINEERING REQUESTS APU REPLACEMENT DUE TO DMM DATA DISCREPANCY. ACFT GROUNDED. REMOVED APU REF AMM 49-11-00-000-803 AND TASK CARD 78349010. STARTED INSTALLATION OF NEW APU REF AMM 49-11-00-400-803 AND COMPLETED STEPS 7. H, I, J, K, L, M & N. 1-5, A, C & E AND REF TASK CARD NR 78349010. COMPLETED APU INSTALLATION REF TASK CARDS 78349015, 78349001, AND 78349010.