# NTSB NYC88LA055: Mitsubishi MU-2B-20, N866Q, White Plains, NY, December 7, 1987

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: December 7, 1987, 17:25 local (22:25 UTC)
- Place: White Plains, NY
- Coordinates: 41.050369, -73.740936 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=41.0504&lon=-73.7409&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report May 26, 1989
- Report: Approved by Office Director
- NTSB case key (mKey): 36074
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=NYC88LA055
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/36074/pdf
- Page: https://openairdocs.org/ntsb/NYC88LA055

## 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 - inoperative (cause)
  - gear extension - not attained, pilot in command (cause)
  - landing gear,gear warning system - inoperative
  - electrical system,circuit breaker - popped/tripped (cause)
  - checklist - not followed, pilot in command (contributing factor)

## Analysis

THE CROSS COUNTRY BUSINESS FLIGHT WAS UNEVENTFUL FROM CONCORD, NEW HAMPSHIRE TO WHITE PLAINS, NEW YORK UNDER CLEAR SKY. DURING FINAL APPROACH, THE PILOT EXTENDED THE GEAR BUT DID NOT NOTICE THAT THE CIRCUIT BREAKER HAD OPENED AND THE GEAR WAS NOT LOWERED. THE AIRCRAFT LANDED GEAR UP AND THE GEAR DOORS PARTIALLY OPEN. THE GEAR WARNING HORN DID NOT OPERATE. THE PLT STATED THAT HE FAILED TO CHECK FOR 3 GREEN LIGHTS.

## Aircraft

- Registration: [N866Q](https://openairdocs.org/deregistered/N866Q-1988-11-25), registration cancelled 1988-11-25, S/N 121 (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: MU-2B-20
- Airframe hours: 5526
- Engines: GARRETT TPE-331-151A 705 horsepower turbo prop
- Damage: Substantial damage
- Flight: Business, Part 91
- Registered owner: Rrh, Inc.
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, May 7, 1987, 71 hours before
- Departed: CON, CONCORD, NH
- Airport: HPN, Winchester Co., runway 34, 6,550 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 70; private; airplane ratings: multi-engine land, multi-engine sea, single-engine land; instrument ratings: airplane; medical: class 3, valid medical--no waivers/lim.; seat: left; flight hours: 5,525 total, 1,695 in this make and model, 5,435 as pilot in command, 63 in the last 90 days, 2 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Night/dark
- Wind: 320° at 10 knots
- Visibility: 20 statute miles
- Lowest ceiling: none
- Temperature: 41 °F, dew point 19 °F
- Altimeter: 30.00 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 19871207070799A](https://openairdocs.org/incident/19871207070799A), Dec 7, 1987: Mtsbsi MU2B20, White Plains, NY, Substantial damage. Failed to note gear circuit breaker open and failed to note if gear came down when activated. Landed gear up.

## Other investigations on N866Q (1)

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 CHI73AC067](https://openairdocs.org/ntsb/CHI73AC067), Jan 31, 1973: Mitsubishi MU-2 (N866Q), Detroit, MI, 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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