# SDR CA030813005

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 8, 2003
- Submitted: September 4, 2003
- Operation: General aviation
- Make and model: Beech B100
- Registry model: [Beech B100](https://openairdocs.org/model/beech-b100) (OpenAirDocs)
- Aircraft time: 6,915 hours
- Engine: Garrtt TPE3316252B
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: Relief Valve
- Part number: MS28893C6
- Condition: Leaking
- Location: Hyd System
- Stage of operation: TX
- How discovered: O
- Nature of condition: J
- Precautionary procedure: D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CA030813005

## Discrepancy

(CAN) THE LANDING GEAR HAD A SERIES OF 2 FAILURES WHERE THE 60 AMP BREAKER TRIPPED AS THE MLG WAS RETRACTING & WOULD NOT RESET THEREBY FORCING THE CREW TO LOWER THE GEAR WITH THE EMERGENCY SYS & RETURN TO BASE. THE FAILURE COULD NOT BE DUPLICATED WHEN THE GEAR WAS SWUNG BY MAINT. THE HYD DRIVE MOTOR WAS BENCH CHECKED OK & BREAKER REPLACED. A THIRD INCIDENT WHERE BREAKER TRIPPED WHILE THE A/C WAS STILL ON THE RAMP PROMPTED MAINT TO CARRY OUT A FULL 1000 HR SYS INSPECTION DURING WHICH THE THERMAL RELIEF VALVE WAS DISCOVERED TO OPEN AT RANDOM CAUSING THE HYD PUMP TO CYCLE RAPIDLY UNTIL CIRCUIT HEATED UP & THE BREAKER TRIPPED. IT WAS REPALCED WITH AN OVERHAULED VALVE AND THE A/C RETURNED TO SERVICE.

---
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.