# NTSB FTW85LQG01: Cessna 421B, N3380Q, Amarillo, TX, April 19, 1985

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Final report
- Date: April 19, 1985, 11:25 local (17:25 UTC)
- Place: Amarillo, TX
- Location: 35.1699° N, 101.8259° W: Placed by OpenAirDocs at TRADEWIND (TDW), within about a mile (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=35.1699&lon=-101.8259&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 4 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 21862
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW85LQG01
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/21862/pdf
- Page: https://openairdocs.org/ntsb/FTW85LQG01

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- Main gear collapsed, landing - roll
  - landing gear,gear locking mechanism - inoperative (cause)

## Analysis

THE ACFT GROUND LOOPED FOLLOWING A COLLAPSE OF THE LEFT MAIN GEAR AFTER A LANDING ROLL OF APRX 600 TO 700 FT. POST ACCIDENT INSPECTION OF THE GEAR REVEALED A BOLT HAD BACKED OUT OF THE GEAR DOWN LOCK ARM WHERE IT LOCKS OVERCENTER.

## Aircraft

- Registration: [N3380Q](https://openairdocs.org/deregistered/N3380Q-2012-10-03), registration cancelled 2012-10-03, S/N 421B0264, built 1972 (OpenAirDocs)
- Reported make and model: CESSNA 421B
- Registry model: [Cessna 421B](https://openairdocs.org/model/cessna-421b) (registry code 2076014) (OpenAirDocs)
- Registry engine: [Continental GTSI0-520-F-K](https://openairdocs.org/engine/continental-gtsi0-520-f-k) (registry code 17031, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 421B0264
- Airframe hours: 2480
- Engines: CONTINENTAL GTSIO-520-H 375 horsepower reciprocating
- Damage: Substantial damage
- Flight: Executive/Corporate, Part 91
- Operator: Cornish Wireline Service
- Airworthiness certificate: Standard, Normal
- Last inspection: 100 hour, March 27, 1985, 54 hours before
- Departed: PPA, PAMPA, TX
- Destination: TOW, AMARILLO, TX
- Flight plan: IFR
- Airport: TDW, Tradewind, runway 23, 2,730 × 55 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 40; airline transport; airplane ratings: multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; seat: left; flight hours: 18,000 total, 1,000 in this make and model, 16,070 as pilot in command, 118 in the last 90 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: 240° at 30 knots, gusting 40
- Visibility: 15 statute miles
- Lowest ceiling: none
- Temperature: 79 °F, dew point -0 °F
- Altimeter: 29.00 inHg

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 19850419013629A](https://openairdocs.org/incident/19850419013629A), Apr 19, 1985: Cessna 421B, Amarillo, TX, Substantial damage. Left main gear collapsed during landing roll. Bolt backed out of down lock arm.

## Other investigations on N3380Q (2)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB ATL83FA073](https://openairdocs.org/ntsb/ATL83FA073), Dec 23, 1982: Cessna 421B (N3380Q), Fort Payne, AL, substantial damage
- [NTSB SEA77DYA12](https://openairdocs.org/ntsb/SEA77DYA12), Feb 23, 1977: Cessna 421B (N3380Q), Soda Springs, ID, substantial damage

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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