# SDR ASAA2021102536427

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 25, 2021
- Submitted: October 29, 2021
- Operation: Air carrier
- Aircraft: [N486AS](https://openairdocs.org/aircraft/N486AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 44107
- Aircraft time: 22,620 hours, 7,216 cycles
- System (JASC): [4930 · APU Engine Fuel and Control](https://openairdocs.org/jasc/4930)
- Part: Valve
- Part number: 38838302
- Condition: Faulty
- Location: Apu
- Stage of operation: NR
- How discovered: V
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021102536427

## Discrepancy

UNSUCCESSFUL CSS. APU AUTO SHUT DOWN AND FAULT LIGHT DURING START AT FL330. GROUNDED - YES. ACCOMPLISHED TASKS REF B737-900 FIM 49-30 TASK 803 (G) 1 THRU 4. NO DEFECTS NOTED. APU ROTATES FREELY. DUE TO THE NATURE OF THE DISCREPANCY (MULTIPLE FAILED CSS) CW FIM 49-30 TASK 803 PAR H(2). FUEL FLOW DIVIDER REPLACED REF B737-900 AMM 49-31-15. OPS CHECK GOOD AND LEAK CHECK GOOD. REF DEFECT NO. 60151878 FOR PREVIOUSLY DEFERRED CSS 49-99A AND DEFECT NO. 60151891 FOR TOP DEFERRAL. FCU PREVIOUSLY REPLACED ON 02/27/2021. THIS CLEARS THE DEFECT. MIG 6 PLACARDS REMOVED. SEAMC JARED NOTIFIED.

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