# SDR ASAA2021092536095

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 25, 2021
- Submitted: October 5, 2021
- Operation: Air carrier
- Aircraft: [N597AS](https://openairdocs.org/aircraft/N597AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35689
- Aircraft time: 48,930 hours, 14,656 cycles
- System (JASC): [4970 · APU Indicating System](https://openairdocs.org/jasc/4970)
- Part: Warning Light
- Condition: Illuminated
- Location: Apu
- Stage of operation: TX
- 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/ASAA2021092536095

## Discrepancy

BLUE MAINT LIGHT ILLUMINATED AFTER STARTING APU ON THE GROUND AFTER LANDING. GROUNDED - YES. APU BITE CHECK SHOWS MAINT MESSAGE 49-72104 DATA MEMORY MODULE SHOW CIRCUIT FAILURE CYCLED POWER TO AIRCRAFT & REPAIR CONFIRMED. CHECKED AND RELEASED PER MEL 49-99A. APU CONTINUOUS OPS POST MAINT. REF ACARS MESSAGE, PER SEAMC APU COLD SOAK START ACCOMPLISHED SUCCESSFULLY. THIS CLEARS MEL 49-99A.

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