# SDR ASAA2022031537720

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 15, 2022
- Submitted: March 31, 2022
- Operation: Air carrier
- Aircraft: [N483AS](https://openairdocs.org/aircraft/N483AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36350
- Aircraft time: 24,156 hours, 7,641 cycles
- Engine: Ge
- System (JASC): [4940 · APU Start/Ignition System](https://openairdocs.org/jasc/4940)
- Part: Ecu
- Part number: 707208601
- Part serial: 6505150200145
- Condition: Faulty
- Location: Aft Cargo Compt
- Part time: 26,282 hours, 9,031 cycles
- Stage of operation: LD
- How discovered: V
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2022031537720

## Discrepancy

APU "MAINT" LIGHT ILLUMINATED AND STAYED ON WHEN APU WAS STARTED AFTER LANDING. APU OPERATED NORMAL. GROUNDED - YES. REMOVED AND REPLACED APU ECU IAW B737-900 AMM 49-61-12. OPS CK NORMAL. CSSP OK ON 3/27.

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