# SDR 99ZZZX4647

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 9, 1999
- Submitted: March 26, 2000
- Operation: General aviation
- Filed by: [Aero Controls, LLC, repair station IU6R626N](https://openairdocs.org/faa-repair-station/IU6R626N/aero-controls-llc.md) (OpenAirDocs)
- Make and model: Boeing 747*
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: Housing
- Part number: 30001764
- Condition: Cracked
- Location: Hydraulic System
- Component: 30001300009A
- Stage of operation: IN
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/99ZZZX4647

## Discrepancy

HOUSING HAS VISIBLE LEAKAGE AT BASE OF FILTER BOSS JUST BELOW THE PRESSURE PORT (P1 OR 4) DUE TO CRACKING.  STRESS CRACKING/DESIGN FLAW AT MANUFACTURING.  C/W CMM 27-10-01, TEMPORARY REV NR 27-07 UNTIL EXISTING LOWER PISTON HOUSING ASSY IS REPLACED WITH NEW 41007178-102.

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