SDR ASAA2019120931537

Service difficulty report · Nozzle · Boeing 737990ER

Difficulty date: December 9, 2019
Submitted: December 10, 2019
Operation: Air carrier
Aircraft: N440AS
Make and model: Boeing 737990ER
Aircraft serial: 41705
Aircraft time: 24,302 hours, 7,871 cycles
System (JASC): 4930 · APU Engine Fuel and Control
Part: Nozzle
Part number: 38304161
Condition: Failed
Location: Apu Fuel Inject
Stage of operation: NR
How discovered: 9
Nature of condition: O
Precautionary procedure: O

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

What was found

APU TREND DATA SHOWS CT5ATP TEMP IS AT OR ABOVE THE THRESHOLD 605 DEGREES. GROUNDED - YES. REPLACED FUEL NOZZLES, P2, T2, PT, & DP SENSORS. LEAK CHECK GOOD. NO FAULTS. MONITORING CT5ATP CONTINUED. PER TECH SERVICES CT5ATP TEMP HAS RETURNED TO NORMAL.