# SDR 2022F00059

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 22, 2022
- Submitted: February 22, 2022
- Operation: General aviation
- Aircraft: [N720MH](https://openairdocs.org/aircraft/N720MH), registered now
- Make and model: Beech 100BEECH
- Aircraft serial: RB176
- Aircraft time: 5,548 hours, 5,280 cycles
- System (JASC): [3600 · Pneumatic System](https://openairdocs.org/jasc/3600)
- Part: None
- Part number: 3909101030002
- Part serial: NSN
- Condition: None
- Location: At Weld Inbd Sid
- Part time: 5,548 hours, 5,280 cycles
- Stage of operation: IN
- How discovered: C
- Nature of condition: Z
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/2022F00059

## Discrepancy

DURING A BI-LEVEL FLOW CONTROL VALVE REPLACEMENT WHILE PERFORMING A BLEED AIR LEAK TEST A LARGE LEAK WAS FOUND ON THE RH ENGINE LOWER Y-TUBE.  THE LEAK WAS ON THE INSIDE FACING THE ENGINE ALONG A WELD.  THE LEAK WAS LARGE ENOUGH IT COULD BE FELT AT ENGINE IDLE SPEED.

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