# SDR ANCF200700028

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 29, 2007
- Submitted: November 1, 2007
- Operation: Air carrier
- Aircraft: [N521NA](https://openairdocs.org/aircraft/N521NA), registered now
- Make and model: Boeing 757236
- Aircraft serial: 25592
- Aircraft time: 62,344 hours, 13,347 cycles
- Engine: Rroyce RB211535E4
- System (JASC): [2922 · Hydraulic Filter, Auxiliary](https://openairdocs.org/jasc/2922)
- Part: Filter
- Part number: 271N20403
- Part serial: 0599A
- Condition: Cracked
- Location: Ptu
- Part time: 230 hours
- Stage of operation: TX
- How discovered: O
- Nature of condition: S
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ANCF200700028

## Discrepancy

PILOT REPORT: AIRPLANE RETURN TO RAMP DUE TO TECHNICAL PROBLEMS ( HYD SYS QTY).  DURING INSPECTION FOUND THE POWER TRANSFER UNIT PRESSURE FILTER MODULE WITH LEAKAGE. REMOVED AND REPLACED THE PTU PRESSURE FILTER MODULE IAW AMM 29-22-02 PAGE 401. OPS TEST OK.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.