# SDR NOCA08507

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 19, 2007
- Submitted: April 24, 2007
- Operation: Air carrier
- Aircraft: [N754NA](https://openairdocs.org/aircraft/N754NA), registered now
- Make and model: Boeing 757-28A
- Registry model: [Boeing 757-28A](https://openairdocs.org/model/boeing-757-28a) (OpenAirDocs)
- Aircraft serial: 293
- Engine: Rroyce RB211535E437
- System (JASC): [7700 · Engine Indicating System](https://openairdocs.org/jasc/7700)
- Part: Switch
- Part number: 44A2562
- Part serial: 1936
- Condition: Malfunctioned
- Location: Altitude
- Stage of operation: CL
- 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/NOCA08507

## Discrepancy

LEFT ENGINE SURGE COMPRESSOR STALL AT FL.360 DURING CLB AT 1.38 EPR LEFT ENG SURGE AGAIN BEFORE INITIAL DESCENT AND DURING DESCENT TOTAL OF 3 TIMES ALL ENGINE INDICATIONS NORMAL AFTER ENGINE SURGE.  ACP INSPECTION OF LEFT ENG INLET, EXHAUST CHIP DETECTORS NO FAULTS OR DEFECTS NOTED.  PER FIM 71-06-00 MM 71-00-00-206.  ACCOMPLISH BITE OF L EEC PER FIM 73-21-00, NO FAULTS NOTED.  CONTINUE TROUBLESHOOTING.  OPERATIONALLY TESTED THE LT ENGINE ALTITUDE SWITCH PER MM 75-32-07.  NO DEFECTS.  FOUND 2 BOROSCOPE BLANKING PLUGS FOR IP AND HP TURBINE AT 5 O`CLOCK POSITION LOOSE SECURED AS REQUIRED BY BORO INSPECTOR.  REPLACED ALTITUDE SWITCH PER MM 75-32-07 PER ROLLS ROYCE ADVICE.  ACP TEST 3 PER MM 71-00-00, NO FAULT FOUN

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