# SDR ASAA11410159

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 23, 2011
- Submitted: July 26, 2011
- Operation: Air carrier
- Aircraft: [N796AS](https://openairdocs.org/aircraft/N796AS), registered now
- Make and model: Boeing 737490
- Aircraft serial: 28891
- Aircraft time: 42,654 hours, 23,699 cycles
- Engine: Cfmint CFM563C1
- Engine time: 42,953 hours, 23,986 cycles
- System (JASC): [7200 · Engine (Turbine/Turboprop)](https://openairdocs.org/jasc/7200)
- Part: Engine
- Part number: CFM563C1
- Part serial: 858768
- Condition: Surges
- Location: Nr 1
- Part time: 42,953 hours, 23,986 cycles
- Stage of operation: CL
- How discovered: O
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA11410159

## Discrepancy

ALMOST TO TOP OF CLIMB (18 MIN INTO FLIGHT) BOTH PILOTS HEARD AN ENGINE SURGE NR 1 N1 99% NR 2 N1 96%.  NR 1 N1 CAME RIGHT DOWN TO 96%.  ON APPROACH HAD A ONE THROTTLE KNOB WIDTH TO MATCH POWER (31 ENGINE THROTTLE BACK TO MATCH) SURGE WAS VERY NOTICABLE IN PAX CABIN.  NO ANNUINCIATORS ILLUMINATED.  ACCOMPLISHED TEST NR 8 ACCEL/DECEL CHECK.  TEST OK NO DEFECTS NOTED.  ACCOMPLISHED TEST 5 POWER ASSURANCE CK.  TEST OK NO DEFECT NOTED.  THROTTLE STAGGER OF LESS THAN 1 KNOB OBSERVED WITHIN LIMITS.

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