# NTSB GAA17CA377: Piper PA 22-150, N1737P, Mammoth Lakes, CA, July 1, 2017

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Data collection · Final report
- Date: July 1, 2017, 12:30 local (19:30 UTC)
- Place: Mammoth Lakes, CA
- Coordinates: 37.624443, -118.83889 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=37.6244&lon=-118.8389&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Defining event: [Landing: Loss of control on ground](https://openairdocs.org/ntsb-events/230)
- Highest injury: No injuries
- Injuries: 3 uninjured
- Status: Completed, report March 27, 2018
- Report: Approved by Office Director
- NTSB office: General Aviation Accidents
- Parties: FAA
- NTSB case key (mKey): 95476
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=GAA17CA377
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/95476/pdf
- NTSB docket: https://data.ntsb.gov/Docket?ProjectID=95476
- Page: https://openairdocs.org/ntsb/GAA17CA377

## Probable cause

The pilot’s failure to maintain directional control during the landing roll.

## Findings

NTSB's coded findings; those marked are part of the probable cause.

- [Performance/control parameters: directional control](https://openairdocs.org/ntsb-findings/01062020): Aircraft › Aircraft oper/perf/capability · Not attained/maintained (probable cause); cases with it: [Piper PA-22-150, 38 cases](https://openairdocs.org/ntsb-findings/01062020/cases.md?model=7102210), [All aircraft, 3,958 cases](https://openairdocs.org/ntsb-findings/01062020/cases.md)
- [Use of equip/info: aircraft control](https://openairdocs.org/ntsb-findings/02063040): Personnel issues › Task performance · Pilot (probable cause); cases with it: [Piper PA-22-150, 52 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md?model=7102210), [All aircraft, 9,295 cases](https://openairdocs.org/ntsb-findings/02063040/cases.md)

## Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event best describes what happened.

- [Landing: Loss of control on ground](https://openairdocs.org/ntsb-events/230) (defining event); cases with it: [Piper PA-22-150, 48 cases](https://openairdocs.org/ntsb-events/230/sequence.md?model=7102210), [All aircraft, 4,585 cases](https://openairdocs.org/ntsb-events/230/sequence.md)
- [Landing: Runway excursion](https://openairdocs.org/ntsb-events/300); cases with it: [Piper PA-22-150, 19 cases](https://openairdocs.org/ntsb-events/300/sequence.md?model=7102210), [All aircraft, 3,643 cases](https://openairdocs.org/ntsb-events/300/sequence.md)
- [Landing: Landing gear collapse](https://openairdocs.org/ntsb-events/094); cases with it: [Piper PA-22-150, 15 cases](https://openairdocs.org/ntsb-events/094/sequence.md?model=7102210), [All aircraft, 1,787 cases](https://openairdocs.org/ntsb-events/094/sequence.md)

## Analysis

During the landing roll, the tailwheel-equipped airplane veered off the runway to the left, the right main landing gear collapsed, and the right wing impacted the ground. The airplane sustained substantial damage to the fuselage. The pilot reported that there were no preaccident mechanical malfunctions or failures with the airplane that would have precluded normal operation. The pilot did not submit the National Transportation Safety Board Pilot/Operator Aircraft Accident/Incident Report Form 6120.1.

## Factual narrative

During the landing roll, the tailwheel-equipped airplane veered off the runway to the left, the right main landing gear collapsed, and the right wing impacted the ground. The airplane sustained substantial damage to the fuselage. The pilot did not report that there were any preaccident mechanical malfunctions or failures with the airplane that would have precluded normal operation. The pilot failed to submit the NTSB Pilot/ Operator Aircraft Accident/ Incident Report Form 6120.1.

## Aircraft

- Registration: [N1737P](https://openairdocs.org/deregistered/N1737P-2019-01-14), registration cancelled 2019-01-14, S/N 22-2527 (OpenAirDocs)
- Reported make and model: PIPER PA 22-150
- Registry model: [Piper PA-22-150](https://openairdocs.org/model/piper-pa-22-150) (registry code 7102210) (OpenAirDocs)
- Registry engine: [Lycoming 0-320 series](https://openairdocs.org/engine/lycoming-0-320-series) (registry code 41508, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: 22-2527
- Engines: LYCOMING O-320 SERIES reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Airworthiness certificate: Standard, Normal
- Destination: MMH, Mammoth Lakes, CA
- Flight plan: Unknown
- Airport: MMH, Mammoth Yosemite, runway 09, 7,000 × 100 ft, asphalt
- Equipment: Unknown

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 44; injuries: none; private; airplane ratings: single-engine land; medical: class 2, with waivers/limitations

## Weather

- Conditions: Visual (VMC), Day
- Wind: 110° at 9 knots
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 82 °F, dew point 27 °F
- Altimeter: 30.14 inHg
- Observed at: KMMH, 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 20170701008789A](https://openairdocs.org/incident/20170701008789A), Jul 1, 2017: Piper PA-22-150, Mammouth, CA, Substantial damage. When landing mmh, the pilot lost control and ground looped in gusty wind conditions. During the ground loop, the main landing gear separated from the aircraft…

## Docket (2 files)

The files NTSB released with the investigation on February 27, 2018, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=95476. 646 KB in all.

- Record of Email (Pilot) (item 1, .PDF, 75 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40460362&FileExtension=.PDF&FileName=Record%20of%20Email%20(Pilot)-Master.PDF
- Accident Photo (Courtesy of FAA) (item 2, .PDF, 1 photo, 571 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40460363&FileExtension=.PDF&FileName=Accident%20Photo%20(Courtesy%20of%20FAA)-Master.PDF

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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