# SDR MZZA97068

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 16, 1997
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: [N624DH](https://openairdocs.org/aircraft/N624DH), registered now
- Make and model: Boeing 727264
- Aircraft serial: 20709
- System (JASC): [3610 · Pneumatic Distribution System](https://openairdocs.org/jasc/3610)
- Part: Mod Valve
- Part number: 39271611
- Condition: Failed
- Location: Nr 3 Engine
- Stage of operation: CR
- Nature of condition: M, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/MZZA97068

## Discrepancy

MNL - FLT 876 - DURING CRUISE GOT A BLEED TRIP ON NR 3 ENGINE, SELECTED NR 2 BLEED SOURCE.  TRIED TO RESET NR 3 DUCT PRESSURE, STILL PLUS 100 PSI.  AFTER SELECTING NR 2 BLEED GOT AFT BODY OVERHEAT LIGHT.  AIR RETURN.  REMOVED AND REPLACED 13TH STAGE MOD VALVE FOR NR 3 BLEED TRIP, OPS CHECK NORMAL.  FOUND LEFT PURGE VALVE CLAMP LEAKING ONTO AFT BODY O/H SENSOR.  REPOSITIONED AND SECURED CLAMP LEAK CHECK GOOD.  (M)

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