# SDR SROM20260112001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 7, 2026
- Submitted: January 12, 2026
- Operation: Air carrier
- Aircraft: [N796CP](https://openairdocs.org/aircraft/N796CP), registered now
- Make and model: Bombdr DHC8402
- Aircraft serial: 4210
- Aircraft time: 32,156 hours, 32,504 cycles
- System (JASC): [2910 · Hydraulic System, Main](https://openairdocs.org/jasc/2910)
- Part: Hydraulic Line
- Part number: 82974216003
- Condition: Chafed
- Location: Zone 400
- Stage of operation: TX
- How discovered: O
- Nature of condition: K, J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/SROM20260112001

## Discrepancy

AFTER ENGINE START IT WAS NOTICED THAT THE INBOARD ROLL SPOILER HYDRAULIC CAUTION LIGHT REMAINED ILLUMINATED AND THEN THAT THE #1 HYDRAULIC QUANTITY WAS VISIBLE DROPPING. THE ENGINES WERE SHUTDOWN WHEN THE #1 HYDRAULIC QUANTITY REACHED APPROXIMATELY 10% AND THE CAUSE OF THE HYDRAULIC LEAK WAS INVESTIGATED. IT WAS FIRST FOUND THAT THE HYDRAULIC LEAK WAS IN THE LEFT FORWARD UPPER WHEEL WELL AREA. EVENTUALLY IT WAS DETERMINED THAT THE LEAK WAS IN THE #1 ENGINE DRIVEN PUMP CASE DRAIN HYDRAULIC TUBE.  THE LEAK WAS CAUSED BY CHAFE DAMAGE TO THE TUBE DUE TO A CUSHION CLAMP THAT HAD DETERIORATED CUSHION RESULTING IN THE METAL OF THE CLAMP FRETTING ON THE TITANIUM TUBE AND CHAFFING A HOLE IN THE TUBE.

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