# SDR ASAA2021042734728

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 27, 2021
- Submitted: May 6, 2021
- Operation: Air carrier
- Aircraft: [N469AS](https://openairdocs.org/aircraft/N469AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41702
- Aircraft time: 25,428 hours, 8,226 cycles
- System (JASC): [4920 · APU Core Engine](https://openairdocs.org/jasc/4920)
- Part: Switch
- Part number: 2EN19RB
- Condition: Out Of Rig
- Location: Apu
- Stage of operation: LD
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021042734728

## Discrepancy

AFTER LANDING, APU FAULT ILLUMINATED. FOLLOWED QRH PROCEDURE. SECOND ATTEMPT APU FAULT LIGHT RE-ILLUMINATED. GROUNDED - YES. FOUND FAULT 49-15004 STILL CURRENT. REMOVED AND REPLACED APU AIR INLET DOOR POSITION SWITCH REF B737-900 AMM 49-15-41. C/W EA 900ER-49EA-263458 FOUND OLD SWITCH OUT OF RIG. C/W GROUND OPS VERIFICATION AND RAN/ STARTED APU MULTIPLE TIMES. NO DEFECTS NOTED, OPS TEST GOOD. NO FAULT CODES FOUND.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.