# SDR ASAA2019072730210

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 27, 2019
- Submitted: July 30, 2019
- Operation: Air carrier
- Aircraft: [N565AS](https://openairdocs.org/aircraft/N565AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35181
- Aircraft time: 48,612 hours, 14,592 cycles
- System (JASC): [4920 · APU Core Engine](https://openairdocs.org/jasc/4920)
- Part: Apu
- Part number: 38007021
- Part serial: P7621
- Condition: Overtemp
- Location: Apu Bay
- Part time: 16,600 hours, 21,473 cycles
- Stage of operation: IN
- How discovered: O
- Nature of condition: M
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2019072730210

## Discrepancy

APU REPORTS SHOW A RAPID SPIKE IN CT5ATP TEMP. CT5ATP TEMP IS AT OR ABOVE THE THRESHOLD 605 DEGREES. INSTALLATION TASKS MAY AFFECT APU ON DEMAND IN-FLIGHT START CAPABILITY. UPON COMPLETION CONTACT MAINTENANCE CONTROL AND REPORT THAT THIS TASK HAS AFFECTED APU IN-FLIGHT START CAPABILITY. GROUNDED - YES. REMOVED AND REPLACED APU. REF AMM 49-11-00 ACCOMPLISHED APU INSTALLATION TEST, OPS TEST AND BITE TEST. APU EXISTING FAULT FOUND.

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