# SDR P5CA2021100100371

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 30, 2021
- Submitted: October 1, 2021
- Operation: Air carrier
- Aircraft: [N642GT](https://openairdocs.org/aircraft/N642GT), registered now
- Make and model: Boeing 767-3Y0
- Registry model: [Boeing 767-3Y0](https://openairdocs.org/model/boeing-767-3y0) (OpenAirDocs)
- Aircraft serial: 26207
- Aircraft time: 81,854 hours, 22,871 cycles
- System (JASC): [3600 · Pneumatic System](https://openairdocs.org/jasc/3600)
- Part: None
- Condition: None
- Stage of operation: CR
- How discovered: V
- Nature of condition: O
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/P5CA2021100100371

## Discrepancy

AFTER FLYING LEVEL AT 6000 MSL, WE INITIATED A CLIMB. WHEN CLIMB THRUST WAS SET THE RIGHT DUCT PRESSURE BEGAN SURGING BETWEEN 15-40 PSI APPROX ONCE PER SECOND. THE CONDITION PERSISTED UNTIL REACHING APROX 16000 MSL. AT THIS POINT THE CABIN DIFFERENTIAL PRESSURE WAS 6 PSI. BOTH LEFT AND RIGHT DUCT PRESSURE STABILIZED AT 36 PSI. REPEAT WRITE UP. REF LOG PAGE # 1435214 AND # 1461261.(<P>INSPECTION OF HPSOV IN R/H ENGINE PYLON IAW AMM 36-11-07. ALL FITTINGS & PLUGS ARE SECURE. NO DAMAGE OR LEAKS NOTED. C/W BITE TEST OF PRSOV IAW FIM 36-20 FT 804. NO FAULTS DETECTED. SYSTEM OP CHECK NORMAL.</P>)

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