SDR ASAA2018123107620

Service difficulty report · Sensor · Boeing 737890

Difficulty date: December 30, 2018
Submitted: December 31, 2018
Operation: Air carrier
Aircraft: N518AS
Make and model: Boeing 737890
Aircraft serial: 35693
Aircraft time: 38,132 hours, 11,344 cycles
System (JASC): 4930 · APU Engine Fuel and Control
Part: Sensor
Part number: 38762261
Condition: Clogged
Location: Apu
Stage of operation: IN
How discovered: 9
Nature of condition: C
Precautionary procedure: K

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 TEMPERATURE IS AT OR ABOVE THE 605 DEGREE THRESHOLD. GROUNDED - YES. ACCOMPLISHED B737-800 FIM 49-40 TASK 825 STEPS D1 THROUGH D6E. REMOVED AND REPLACED ALL FUEL NOZZLES REF B737-800 AMM 49-31-14. FOUND TOTAL PRESSURE SENSOR ORIFICE PARTIALLY BLOCKED. REMOVED AND REPLACED TOTAL PRESSURE SENSOR REF AMM 49-52-32. OPS CHECK GOOD. NO FUEL LEAKS NOTED. NO FAULTS MESSAGES OR MAINTENANCE MESSAGES ON APU BITE.