# NTSB NYC84LA141: Piper PA-23, N2080P, Lawrence, MA, March 24, 1984

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: March 24, 1984, 11:30 local (16:30 UTC)
- Place: Lawrence, MA
- Location: 42.7170° N, 71.1235° W: Placed by OpenAirDocs at LAWRENCE MUNI (LWM), within about a mile (OpenAirDocs)
- Nearby events: https://openairdocs.org/map.md?lat=42.7170&lon=-71.1235&mi=10
- Phase of flight: [Taxi](https://openairdocs.org/ntsb-phases/250) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 3 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 35537
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=NYC84LA141
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/35537/pdf
- Page: https://openairdocs.org/ntsb/NYC84LA141

## Sequence of events

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

- Main gear collapsed, taxi - from landing
  - landing gear,gear locking mechanism - foreign object (cause)
  - landing gear,gear locking mechanism - not engaged (cause)

## Analysis

AS THE PLT COMPLETED HIS LANDING, HE LET THE ACFT ROLL-OUT TO THE INTERSECTION OF RWYS 32 & 23 WHERE HE INTENDED TO TURN OFF THE ACTIVE RWY. HE REPORTED THAT WHEN HE CAME TO THE INTERSECTION, THE RIGHT GEAR 'COLLAPSED' (RETRACTED) & THE ACFT SKIDDED TO THE RIGHT. HE STATED THAT THE ACFT CAME TO A STOP IN THE INTERSECTION, THEN THE LEFT GEAR ALSO 'COLLAPSED.' LATER, THE ACFT WAS PUT ON JACKS & THE LANDING GEAR WAS PUMPED DOWN. AN EXAM REVEALED NO EVIDENCE OF A MECHANICAL PROBLEM, EXCEPT SAND WAS FOUND IN THE HINGE AREA OF THE LANDING GEAR. REPORTEDLY, THE SAND WOULD HAVE PREVENTED THE LANDING GEAR FROM PROPERLY LOCKING IN THE DOWN POSITION.

## Aircraft

- Registration: [N2080P](https://openairdocs.org/deregistered/N2080P-2019-09-06), registration cancelled 2019-09-06, S/N 23-667 (OpenAirDocs)
- Reported make and model: PIPER PA-23
- Registry model: [Piper PA-23](https://openairdocs.org/model/piper-pa-23) (registry code 7102302) (OpenAirDocs)
- Registry engine: [Lycoming 0-320 series](https://openairdocs.org/engine/lycoming-0-320-series) (registry code 41508, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 667
- Airframe hours: 3564
- Engines: LYCOMING O-340-A1A 130 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Registered owner: Aldie J. Therriault
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, March 1, 1984, 5 hours before
- Departed: MHT, MANCHESTER, NH
- Airport: LWM, Lawrence Municipal, runway 32, 3,901 × 100 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 57; private; airplane ratings: multi-engine land, single-engine land; medical: class 3, valid medical--no waivers/lim.; seat: left; flight hours: 1,250 total, 200 in this make and model, 20 in the last 90 days

## Weather

- Conditions: Visual (VMC), Day
- Temperature: -0 °F

## 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 19840324014489A](https://openairdocs.org/incident/19840324014489A), Mar 24, 1984: Piper PA23, Lawrence, MA, Substantial damage. Main landing gears collapsed on the landing rollout. No defects found except gravel in the downlock mechanism.

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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