# SDR AU961199

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: August 19, 1996
- Submitted: March 26, 2000
- Operation: General aviation
- Make and model: Dhav DHC8103
- Engine: Pwa PW121
- System (JASC): [3220 · Nose/Tail Landing Gear](https://openairdocs.org/jasc/3220)
- Part: Bolt
- Condition: Jammed Gear
- Location: Nose-Tail Gear
- Stage of operation: LD
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/AU961199

## Discrepancy

(AUS) NOSE LANDING GEAR WOULD NOT EXTEND - AIRCRAFT LANDED WITH NLG  RETRACTED - INVESTIGATION FOUND THAT A NEW NLG WAS RECEIVEDWITHOUT THE TOP SECTION OF THE PROXIMITY SENSOR PROTECTIVE COVER - A NEW ONE WAS MANUFACTURED AND FITTED WITH HEXAGON HEADED BOLTSINSTEAD OF THE CORRECT COUNTERSUNK ITEMS REQUIRED BY THE MANUFACTURER - INTERNAL SPACERS WERE ALSO USED TO OBTAIN THE CORRECT INTERNAL CLEARANCE BETWEEN THE COVER AND THE PROXIMITY SENSORS - THE USE OF THE HEXAGON BOLTS AND SPACERS RESULTED IN THE BOLTS CONTACTING THE UPPER DRAG BRACE DURING NLG RETRACTION  PREVENTING NLG EXTENSION - DAMAGE CAUSED TO THE UNDERSIDE OF THE AIRCRAFT - PERSONNEL/MAINTENANCE ERROR - UNAPPROVED PART

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