# SDR CALA2014050690967

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 2, 2014
- Submitted: May 6, 2014
- Operation: Air carrier
- Aircraft: N537UA
- Make and model: Boeing 757222
- Aircraft serial: 25157
- Aircraft time: 73,996 hours, 27,021 cycles
- Engine: Pwa PW2040
- Engine time: 200 hours, 30,704 cycles
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Controller
- Condition: Malfunctioned
- Location: Nr 1 Engine
- Stage of operation: IN
- How discovered: O
- Nature of condition: R
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2014050690967

## Discrepancy

WHEN PERFORMING THE REVERSE FLOW PROTECTION CHECK THE LT NR 1 ENG APPEARED TO HAVE A COMPRESSOR STALL & WENT SUB-IDLE & STAYED THERE WITH BOTH ENG BLEED VLVS OPEN.  THE ISOLATION VLV OPEN & BOTH THROTTLES INITIALLY AT IDLE THE DUCT PRESS WAS NORMAL AROUND 15 PIS INCOMPLETE.  R & R NR 1 ENG REVERSE FLOW CHECK CONTROLLER.  OPERATIONS CHECKED GOOD ON ENG RUN IAW AMM 36-11-18 & JRH 2-5-1.

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