# SDR ASAA2018062325180

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 23, 2018
- Submitted: June 27, 2018
- Operation: Air carrier
- Aircraft: [N529AS](https://openairdocs.org/aircraft/N529AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35198
- Aircraft time: 32,170 hours, 9,645 cycles
- System (JASC): [4970 · APU Indicating System](https://openairdocs.org/jasc/4970)
- Part: Warning System
- Condition: False Activation
- Location: Cockpit
- Stage of operation: NR
- How discovered: O
- Nature of condition: N
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2018062325180

## Discrepancy

APU FAULT ILLUMINATED AFTER ATTEMPTED START. GROUNDED - YES. PERFORMED APU BITE PER FIM 49-60 TASK 801, APU SHOWS CURRENT STATUS MESSAGE FAULT 49-41254 "START CONVERTER UNIT SHOWS START SYSTEM INOP" NO ROTATION SHUTDOWN. PERFORMED FIM 49-40-TASK 821 APU STARTED NORMALLY 5 TIMES - NO FAULT CODES IN FAULT HISTORY OR CURRENT STATUS PAGE. APU OPS CHECKS OK.

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