# SDR CALA2019052400810

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 21, 2019
- Submitted: May 24, 2019
- Operation: Air carrier
- Aircraft: [N780UA](https://openairdocs.org/aircraft/N780UA), registered now
- Make and model: Boeing 777222
- Aircraft serial: 26944
- Aircraft time: 89,492 hours, 15,541 cycles
- System (JASC): [2923 · Hydraulic Pump, Auxiliary](https://openairdocs.org/jasc/2923)
- Part: Pump
- Part number: 973930
- Condition: Cracked
- Location: Hydraulic Sys
- Stage of operation: IN
- How discovered: O
- Nature of condition: K
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CALA2019052400810

## Discrepancy

RAT HYDRAULIC PUMP CASE SPLIT WHILE ACCOMPLISHING AN OPERATIONAL TEST. NEED TO CREATE SDR DUE TO RAT PUMP FAILURE REF GMM 04-20-16 WHILE PERFORMING A FUNCTIONAL CK OF THE RAT SYS, PER AMM 29-21- 00-730-801, THERE WAS A CATASTRPHIC FAILURE OF THE HYD PUMP RESULTING IN THE COMPLETE DEPLETION OF THE CTR HYD RESERVOIR. THIS WAS A SCHEDULED GROUND CK OF THE RAT SYS. THE PART # OF THE PUMP IS 973930 & THE S/N MX-591157.

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