# NTSB ATL90LA053: Mitsubishi MU2B-20, N40RP, Nashville, TN, January 23, 1990

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: January 23, 1990, 02:06 local (08:06 UTC)
- Place: Nashville, TN
- Coordinates: 36.110782, -86.659126 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=36.1108&lon=-86.6591&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report October 2, 1992
- Report: Approved by Office Director
- NTSB case key (mKey): 8201
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=ATL90LA053
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/8201/pdf
- Page: https://openairdocs.org/ntsb/ATL90LA053

## Probable cause

INADEQUATE MAINTENANCE ADJUSTMENT OF THE LANDING GEAR SYSTEM WHICH RESULTED IN THE JAMMING OF THE LEFT GEAR DOOR.

## Sequence of events

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

- Gear not extended, landing
  - landing gear,normal retraction/extension assembly - jammed (cause)
  - maintenance,adjustment - inadequate, company maintenance personnel (cause)

## Analysis

AFTER ARRIVING AT THE DESTINATION THE LANDING GEAR COULD NOT BE EXTENDED. THE AIRPLANE WAS FLOWN BACK TO ITS BASE WHERE A GEAR UP LANDING WAS PERFORMED. EXAMINATION OF THE AIRPLANE REVEALED THAT THE LEFT GEAR DOOR DID NOT UNLOCK. THE EMERGENCY EXTENSION SYSTEM FAILED TO OPERATE AS A RESULT OF EITHER THE FAILURE OF THE CLUTCH ACTUATOR TO RESET AFTER THE LAST RETRACTION OR SLIPPAGE OF THE CLUTCH. THE PILOT'S REPORT STATED THAT THE DIRECTOR OF MAINTENANCE INDICATED THAT THE ACCIDENT COULD HAVE BEEN PREVENTED BY MORE FREQUENT LUBRICATION OF THE CLUTCH.

## Aircraft

- Registration: N40RP (not matched to a registry record)
- Reported make and model: MITSUBISHI MU2B-20
- Category: Airplane
- Serial number: 139
- Airframe hours: 6211
- Engines: GARRETT TPE 331-1 605 horsepower turbo prop
- Damage: Substantial damage
- Flight: Part 135
- Operator: Transportation America Corp.
- Registered owner: B & J Leasing, Inc.
- Last inspection: 100 hour, January 7, 1990, 34 hours before
- Departed: BNA
- Destination: MEM, MEMPHIS, TN
- Flight plan: IFR
- Airport: BNA, Nashville Int'L, runway 20R, 7,700 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 41; commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; flight hours: 8,200 total, 2,700 in this make and model, 300 in the last 90 days, 7 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Night/bright
- Wind: 200° at 8 knots
- Visibility: 15 statute miles
- Lowest ceiling: none
- Temperature: 41 °F, dew point 30 °F
- Altimeter: 30.00 inHg
- Observed at: BNA, 1 nm away

## 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 19900123064649A](https://openairdocs.org/incident/19900123064649A), Jan 23, 1990: Mtsbsi MU2B20, Nashville, TN, Substantial damage. Unable to extend landing gear at destination. Returned. Landed gear up. Door actuator clutch slipped. Lacked lube.

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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