# NTSB FTW85LA229: Mitsubishi MU-2B-20, N711LL, San Angelo, TX, May 21, 1985

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: May 21, 1985, 12:32 local (17:32 UTC)
- Place: San Angelo, TX
- Location: 31.3577° N, 100.4963° W: Placed by OpenAirDocs at SAN ANGELO RGNL/MATHIS FLD (SJT), within about a mile (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=31.3577&lon=-100.4963&mi=10
- Phase of flight: [Approach](https://openairdocs.org/ntsb-phases/500) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 21755
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW85LA229
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/21755/pdf
- Page: https://openairdocs.org/ntsb/FTW85LA229

## Sequence of events

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

- Airframe/component/system failure/malfunction, approach
  - landing gear,nose gear - jammed (cause)
  - maintenance,inspection - inadequate, other maintenance personnel (contributing factor)
- On ground/water encounter with terrain/water, landing - roll

## Analysis

A PIECE OF UNIDENTIFIED EQUIPMENT REPORTEDLY WAS NOT PROPERLY SECURED DURING PREVIOUS MAINTENANCE. THE EQUIPMENT REPORTEDLY WAS MOUNTED IMMEDIATELY ABOVE THE NOSE WHEEL EXTENSION/RETRACTION MECHANISM AND MOVED DUE TO ACFT VIBRATION PREVENTING THE NOSE GEAR FROM BEING EXTENDED. A LANDING WAS MADE WITH THE MAIN GEAR DOWN AND LOCKED AND THE NOSE GEAR IN THE RETRACTED POSITION.

## Aircraft

- Registration: [N711LL](https://openairdocs.org/deregistered/N711LL-2017-03-22), registration cancelled 2017-03-22, S/N 180, built 1969 (OpenAirDocs)
- Reported make and model: MITSUBISHI MU-2B-20
- Registry model: [Mitsubishi MU-2B-20](https://openairdocs.org/model/mitsubishi-mu-2b-20) (registry code 5780407) (OpenAirDocs)
- Category: Airplane
- Serial number: 180
- Engines: GARRETT TPE-331-1-151 705 horsepower turbo prop
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Executive Aero, Inc.
- Departed: LBB, LUBBOCK, TX
- Airport: SJT, Mathis, runway 36, 6,920 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; airline transport; airplane ratings: multi-engine land; medical: unknown, unknown; seat: left

## Weather

- Conditions: Visual (VMC), Day
- Wind: 300° at 3 knots
- Visibility: 20 statute miles
- Lowest ceiling: none
- Temperature: 79 °F, dew point 57 °F
- Altimeter: 30.00 inHg
- Observed at: SJT

## 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 19850521069979A](https://openairdocs.org/incident/19850521069979A), May 21, 1985: Mtsbsi MU2B20, San Angelo, TX, Substantial damage. Nose gear could not be extended for landing. Nose gear was jammed by a piece of improperly installed equipment.

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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