# SDR OZCA340088230207

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 7, 2023
- Submitted: April 20, 2023
- Operation: Air carrier
- Aircraft: [N901BC](https://openairdocs.org/aircraft/N901BC), registered now
- Make and model: Saab SF340A
- Registry model: [Saab SF340A](https://openairdocs.org/model/saab-scania-sf340a) (OpenAirDocs)
- Aircraft serial: 088
- Aircraft time: 47,225 hours, 55,187 cycles
- System (JASC): [2900 · Hydraulic Power System](https://openairdocs.org/jasc/2900)
- Part: Unknown
- Condition: Unknown
- Location: Unknown
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/OZCA340088230207

## Discrepancy

DURING CRUISE, HYD PUMP TURNED ON & NO MAIN ACCUM PRESS INCREASED. RETURNED TO MIA. FOLLOWED QRH. HYD CWP LIGHT ILLUM.  R/R MAIN HYD RES. PERFORMED AIR BLEED SYS AT HYD SYS IAW 29-00-00 OPS & LEAK CHECK SAT.  TAXI OUT, HYD PUMP MULTIPLE TIMES PER MINUTE: PRESSURE IN MAIN RES DECREASE FASTER THAN NORMAL. HYD FLUID QTY DID NOT CHANGE. R/R HYD PUMP IAW 29-00-00 OPS & LEAK CHECK SAT.  PRESS IN MAIN RES DECREASE FASTER THAN NORMAL, EMERG RES DECREASED. R/R MAIN & EMER ACCUM IAW 29-00-00 OPS & LEAK CHECK SAT. MAIN ACCUM DROPPING PRESS BELOW 2000 PSI PUMP CYCLE 6-8 TIMES DURING TAXI FROM RAMP - RWY. INSPECTED HYD SYS, FOUND HAND PUMP SELECT VALVE OUT OF POSTION. OPS CHECKED ON MAIN ACCUM IAW FAULT ISOLATION 29-10-00-01 PAGE 7 OF MM 29-20-15-04.

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