# NTSB BFO93LA020: Dornier DO-228-202, N245RP, Manchester, NH, January 10, 1993

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: January 10, 1993, 13:25 local (18:25 UTC)
- Place: Manchester, NH
- Location: 42.9956° N, 71.4548° W: Placed by OpenAirDocs: center of Manchester, NH, within about 6 miles (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=42.9956&lon=-71.4548&mi=10
- Phase of flight: [Initial climb](https://openairdocs.org/ntsb-phases/350) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 5 uninjured
- Status: Completed, report October 13, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 11893
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=BFO93LA020
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/11893/pdf
- Page: https://openairdocs.org/ntsb/BFO93LA020

## Probable cause

INCORRECT INSTALLATION OF THE SEALS IN THE NOSE GEAR ASSEMBLY, WHICH PREVENTED THE NOSE GEAR FROM LOCKING IN THE DOWN POSITION.

## Sequence of events

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

- Airframe/component/system failure/malfunction, takeoff - initial climb
  - landing gear,gear warning system - inoperative
  - landing gear,gear locking mechanism - not engaged (cause)
  - installation - improper, other maintenance personnel (cause)
- Gear not extended, landing - roll
  - landing gear,nose gear assembly - jammed

## Analysis

DURING THE INITIAL CLIMB AFTER TAKEOFF, THE PILOT REPORTED THAT WHEN THE GEAR WAS RETRACTED, THERE WAS AN UNSAFE GEAR WARNING.  AFTER SEVERAL UNSUCCESSFUL ATTEMPTS TO CORRECT THE CONDITION, INCLUDING RECYCLING THE GEAR FOUR TIMES, THE FLIGHT DIVERTED.  ALTHOUGH THE PILOT HAD DOWN AND LOCK INDICATION FOR THE THREE GEAR DURING THE RECYCLING, AFTER THE FOURTH CYCLE, THERE WAS NO GEAR INDICATION, DESPITE ATTEMPTS TO EXTEND IT USING THE EMERGENCY GEAR EXTENSION SYSTEM. THE PILOT DID A LOW PASS OVER THE AIRPORT WHERE AIR TRAFFIC CONTROL PERSONNEL CONFIRMED THE NOSE GEAR WAS NOT EXTENDED.  THE PILOT SUBSEQUENTLY LANDED NOSE GEAR UP.  EXAMINATION OF THE NOSE GEAR ASSEMBLY REVEALED THE NOSE GEAR SHOCK STRUT WAS COLLAPSED ABOUT THREE QUARTERS OF AN INCH FROM FULL EXTENSION, WHICH PREVENTED THE STRUT FROM ENGAGING THE UPLOCK DURING RETRACTION, AND PREVENT THE DEACTIVATION OF THE UNSAFE WARNING DURING EXTENSION.  IT WAS ALSO DETERMINED THAT THE PARTIALLY EXTENDED STRUT COULD IMPROPERLY CONTACT THE UPLOCK, RESTRICTING THE MOVEMENT OF THE STRUT.  FURTHER DISASSEMBLY CONFIRMED THE INCORRECT INSTALLATION OF THE TWO INTERNAL SEALS, WHICH WOULD PREVENT THE STRUT FROM EXTENDING FULLY.

## Aircraft

- Registration: [N245RP](https://openairdocs.org/deregistered/N245RP-1995-08-01), registration cancelled 1995-08-01, S/N 8125 (OpenAirDocs)
- Reported make and model: DORNIER DO-228-202
- Registry model: [Dornier DORNIER 228-202](https://openairdocs.org/model/dornier-dornier-228-202) (registry code 2992030) (OpenAirDocs)
- Category: Airplane
- Serial number: 8125
- Airframe hours: 8202
- Engines: GARRETT TPE331 5252D 715 horsepower turbo prop
- Damage: Substantial damage
- Flight: Part 135
- Operator: Precision Airlines
- Registered owner: Deutsche Credit Corporation
- Airworthiness certificate: Standard, Normal
- Last inspection: Continuous airworthiness, January 8, 1993, 7 hours before
- Departed: BOS, BOSTON, MA
- Destination: MHT, NH
- Flight plan: IFR
- Airport: MHT, Manchester, runway 35, 7,001 × 250 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 30; airline transport; airplane ratings: multi-engine land, single-engine land; instrument ratings: airplane; medical: class 1, valid medical--no waivers/lim.; seat: left; flight hours: 3,700 total, 2,650 in this make and model

## Weather

- Conditions: Visual (VMC), Day
- Wind: 30° at 3 knots
- Visibility: 25 statute miles
- Lowest ceiling: 10,000 ft broken
- Temperature: 18 °F, dew point 1 °F
- Altimeter: 30.00 inHg
- Observed at: MHT, 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 19930110000269A](https://openairdocs.org/incident/19930110000269A), Jan 10, 1993: Dorner DO228201, Manchester, NH, Substantial damage. Unable extend nose gear. Landed nose gear up. Strut was collapsed due improper installation.

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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