ASN Wikibase Occurrence # 230495
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| Date: | Thursday 13 October 2016 |
| Time: | 16:45 LT |
| Type: |  Shorts C-23C Sherpa (360) |
| Owner/operator: | U.S. Department of Agriculture |
| Registration: | N148Z |
| MSN: | SH.3428 |
| Year of manufacture: | 1994 |
| Total airframe hrs: | 5203 hours |
| Engine model: | Pratt & Whitney PT6A-65R |
| Fatalities: | Fatalities: 0 / Occupants: 2 |
| Aircraft damage: | Minor |
| Category: | Serious incident |
| Location: | Missoula International Airport, MT -
 United States of America
|
| Phase: | Landing |
| Nature: | Ferry/positioning |
| Departure airport: | Kingman Airport, AZ (IGM/KIGM) |
| Missoula KMSO | |
| Investigating agency: | NTSB |
| Confidence Rating: |  Accident investigation report completed and information captured |
A Short SD3-60 Sherpa airplane, N148Z, sustained minor damage following a nose gear collapse during landing, at the Missoula International Airport (MSO) Montana, USA. The two pilots, were not injured. The airplane was registered to and operated by United States Department of Agriculture (USDA), as a public aircraft in support of the Forest Service. Visual meteorological conditions prevailed and a visual flight rules (VFR) flight plan was filed for the ferry flight which originated from Kingman Airport, Arizona, about 12:53.
The pilots reported that prior to landing, they had an unsafe nose gear indication. After multiple unsuccessful attempts to get the nose gear to extend and indicate that it was down and locked, they decided to come in for a landing. During the landing roll, as the airplane's nose was lowered, the nose gear collapsed, and the forward section of the bottom of the fuselage, made contact with the runway surface. Once the airplane came to a stop, both pilots egressed.
Postaccident examination of the nose gear confirmed the nose gear's failure to lock, which led to its collapse. Observation of the nose gear down-lock actuator piston revealed that it had been painted, which prevented the piston from engaging and locking the nose gear during extension. Before the flight, maintenance personnel and the flight crew did not observe that the nose gear down-lock actuator piston area was painted.
PROBABLE CAUSE: The failure of the nose landing gear down-lock piston to engage due to paint accumulation, which resulted in a nose landing gear collapse during landing. Also causal was the failure of the facility that performed the painting to comply with manufacturer guidance regarding painting of the airplane.
Accident investigation:
 |
|
Sources:
http://aerossurance.com/safety-management/poor-painting-nlg-collapse/
https://app.ntsb.gov/pdfgenerator/ReportGeneratorFile.ashx?EventID=20161014X31149&AKey=1&RType=HTML&IType=IA
Location
Media:
Despite a Service Information Letter that highlighted the MM instructions, the NLG downlock actuator piston of this USDA smokejumper Shorts C-23 was painted. The NLG collapsed on the next landing.https://t.co/Lcb6hiIddP #flightsafety #airworthiness pic.twitter.com/FTdLhF7ifH
— Aerossurance (@Aerossurance) April 23, 2020
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 09-Nov-2019 18:57 | harro | Added |
| 09-Nov-2019 19:02 | harro | Updated [Aircraft type] |
| 23-Apr-2020 14:29 | Aerossurance | Updated [Source] |
| 23-Apr-2020 15:37 | Aerossurance | Updated [Embed code] |
| 12-Nov-2022 01:45 | Ron Averes | Updated [Operator, Location, Departure airport, Destination airport, Embed code] |
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