# SDR ASAA2022051538312

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 15, 2022
- Submitted: May 16, 2022
- Operation: Air carrier
- Aircraft: [N408AS](https://openairdocs.org/aircraft/N408AS), registered now
- Make and model: Boeing 737-900ER
- Registry model: [Boeing 737-900ER](https://openairdocs.org/model/boeing-737-900er) (OpenAirDocs)
- Aircraft serial: 41732
- Aircraft time: 34,519 hours, 10,959 cycles
- System (JASC): [4930 · APU Engine Fuel and Control](https://openairdocs.org/jasc/4930)
- Part: Nozzle
- Part number: 38304161
- Condition: Faulty
- Location: Apu
- Stage of operation: IN
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2022051538312

## Discrepancy

APU TREND DATA SHOWS CT5ATP TEMP IS ABOVE 605 BUT BELOW THE THRESHOLD 632 DEGREES. ETOPS SIGNIFICANT SYSTEM TASK AFFECTS APU ON DEMAND IN-FLIGHT START CAPABILITY. THIS APU HAS BEEN PLACED ON ASA MEL 49-99B. CONTINUOUS OPERATION ON ETOPS FLIGHTS. GROUNDED - YES. REMOVED AND REPLACED 9 APU FUEL NOZZLES REF B737-900 AMM 49-31-14. COMPLETED STEPS E.2 TO E.3 REF B737-900 FIM 49-15 TASK 807. REPLACE 10TH FUEL NOZZLE REF AMM 49-31-14. LEAK & OPS CHECKED GOOD. NO VIBRATIONS NOTED DURING APU OPERATION REF FIM 49-15 TASK 807 STEP D.(1)

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