# NTSB WPR11CA468: Beech 36, N7549N, Riverton, WY, September 24, 2011

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Data collection · Final report
- Date: September 24, 2011, 10:00 local (16:00 UTC)
- Place: Riverton, WY
- Coordinates: 43.064167, -108.459724
- Nearby events: https://openairdocs.org/map.md?lat=43.0642&lon=-108.4597&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Defining event: [Landing-landing roll: Landing gear collapse](https://openairdocs.org/ntsb-events/094)
- Highest injury: No injuries
- Injuries: 1 uninjured
- Status: Completed, report December 1, 2011
- Report: Approved by Office Director
- NTSB office: Western Pacific Region
- Parties: Federal Aviation Administration
- NTSB case key (mKey): 81904
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=WPR11CA468
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/81904/pdf
- NTSB docket: https://data.ntsb.gov/Docket?ProjectID=81904
- Page: https://openairdocs.org/ntsb/WPR11CA468

## Probable cause

The pilot's inadvertent retraction of the landing gear during the landing roll.

## Findings

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

- [Action: incorrect action performance](https://openairdocs.org/ntsb-findings/02041015): Personnel issues › Action/decision · Pilot (probable cause); cases with it: [Beech 36, 1 case](https://openairdocs.org/ntsb-findings/02041015/cases.md?model=1151602), [All aircraft, 1,386 cases](https://openairdocs.org/ntsb-findings/02041015/cases.md)
- [Landing gear system: landing gear selector](https://openairdocs.org/ntsb-findings/01023234): Aircraft › Aircraft systems · Unintentional use/operation (probable cause); cases with it: [Beech 36, 1 case](https://openairdocs.org/ntsb-findings/01023234/cases.md?model=1151602), [All aircraft, 54 cases](https://openairdocs.org/ntsb-findings/01023234/cases.md)

## Sequence of events

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

- [Landing-landing roll: Landing gear collapse](https://openairdocs.org/ntsb-events/094) (defining event); cases with it: [Beech 36, 1 case](https://openairdocs.org/ntsb-events/094/sequence.md?model=1151602), [All aircraft, 1,787 cases](https://openairdocs.org/ntsb-events/094/sequence.md)

## Analysis

The pilot said that after landing he inadvertently moved the main landing gear lever rather than the flap lever to the retract position, which resulted in the collapse of all three landing gear and substantial damage to the undercarriage of the airplane. The pilot reported no anomalies with the airplane that would have precluded normal operation.

## Factual narrative

The pilot said that after landing he inadvertently selected the main landing gear lever rather than the flap lever to the retract position, which resulted in the collapse of all three landing gear and substantial damage to the undercarriage of the airplane.

## Aircraft

- Registration: [N7549N](https://openairdocs.org/aircraft/N7549N), registered now, S/N E-66, built 1968 (OpenAirDocs)
- Reported make and model: BEECH 36 (NO SERIES)
- Registry model: [Beech 36](https://openairdocs.org/model/beech-36) (registry code 1151602) (OpenAirDocs)
- Registry engine: [Continental IO-520 series](https://openairdocs.org/engine/continental-io-520-series) (registry code 17032, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: E-66
- Airframe hours: 4689
- Engines: Teledyne Continental IO-520 285 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, April 8, 2011, 38 hours before
- Departed: RIW, Riverton, WY
- Destination: RIW, Riverton, WY
- Flight plan: Unknown
- Airport: RIW, Riverton Regional Airport, runway 28, 8,203 × 150 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 49; injuries: none; private; airplane ratings: single-engine land; medical: class 3, without waivers/limitations; last flight review October 31, 2010; seat: left; flight hours: 219 total, 130 in this make and model

## Weather

- Conditions: Visual (VMC), Day
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 64 °F, dew point 27 °F
- Altimeter: 30.31 inHg
- Observed at: RiW

## 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 20110924023569A](https://openairdocs.org/incident/20110924023569A), Sep 24, 2011: Beech 36, Riverton, WY, Substantial damage. On September 24th, 2011 at approximately 10:00 MDT, N7549N, a Beechcraft model 36 aircraft sustained substantial damage when upon landing roll out the landing…

## Docket (1 files)

The files NTSB released with the investigation on October 26, 2011, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=81904. 467 KB in all.

- Pilot/Operator Aircraft Accident Report, NTSB Form 6120.1 (item 1, .PDF, 467 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=40356227&FileExtension=.PDF&FileName=Pilot%2FOperator%20Aircraft%20Accident%20Report,%20NTSB%20Form%206120.1-Redacted.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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