# SDR AALA201907319010

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 28, 2019
- Submitted: July 31, 2019
- Operation: Air carrier
- Aircraft: [N830NN](https://openairdocs.org/aircraft/N830NN), registered now
- Make and model: Boeing 737823
- Aircraft serial: 31091
- Aircraft time: 29,689 hours, 11,930 cycles
- System (JASC): [3230 · Landing Gear Retraction/Extension System](https://openairdocs.org/jasc/3230)
- Part: Transfer Valve
- Part number: 10620394
- Part serial: 3264
- Condition: Unreliable
- Location: Landing Gear
- Stage of operation: CL
- How discovered: O
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AALA201907319010

## Discrepancy

AIRCRAFT WAS GROUNDED: PILOT REPORTS WHEN GEAR HANDLE SELECTED UP, HYD SYSTEM LO PRESS MASTER CAUTION LIGHT ON 6 PACK ILLUMINATED BRIEFLY THEN EXTINGUISHED. GEAR RETRACTED NORMALLY. MAINTENANCE REMOVED AND REPLACED THE #1 EDP IAW AMM 29-11-11-000-801-001. REMOVED/LOOSENED 2 LOWER PRESSURE LINE CLAMPS @ FAN CASE BEHIND IDG & STARTER IAW SUBTASK 020-004-101, STEP 5 . REMOVED L/G TRANSFER VALVE IAW AMM 32-31-71-020-801.  ACCOMPLISHED ALL REQUIRED OPS AND LEAK CHECKS, SYSTEM OPS CHECKS NORMAL. (SEE SDR # AALA201907309014)

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