# SDR ASAA2021010633832

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 6, 2021
- Submitted: January 8, 2021
- Operation: Air carrier
- Aircraft: [N435AS](https://openairdocs.org/aircraft/N435AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 43292
- Aircraft time: 27,398 hours, 8,796 cycles
- Engine: Cfmint CFM567B27E
- System (JASC): [8012 · Engine Start Valves/Controls](https://openairdocs.org/jasc/8012)
- Part: Start Valve
- Part number: 32896302
- Part serial: 10034
- Condition: Inoperative
- Location: Nr 2 Engine
- Part time: 46,659 hours, 15,144 cycles
- Stage of operation: TX
- How discovered: 9
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021010633832

## Discrepancy

NR 2 ENGINE ACCELERATION SEEMED SLOWER THAN NORMAL DURING START CYCLE BEFORE START LEVER WAS MOVED TO IDLE.  ENGINE STARTED NORMALLY AFTERWARDS.  MAX MOTORING WAS 23.9%.  NR 1 ENGINE STARTED NORMALLY.  GROUNDED-YES.  REMOVED AND REPLACED NR 2 ENGINE START VALVE, REF B737-900 AMM 80-11-03.  VERIFIED STARTER CHIP PLUG FREE OF CONTAMINATION.  CONDUCTED DRY MOTOR & LEAK CHECK.  SIGNIFICANT SYSTEM GROUND VERIFICATION GOOD, REF AMM 71-00-00-800-811-F00.

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