# NTSB CEN21LA453: Beech M35, N9835R, Osage Beach, MO, September 17, 2021

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Class 4 · Limited · Final report
- Date: September 17, 2021, 10:12 local (15:12 UTC)
- Place: Osage Beach, MO
- Coordinates: 38.110752, -92.680852 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=38.1108&lon=-92.6809&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Defining event: [Landing-flare/touchdown: Landing gear not configured](https://openairdocs.org/ntsb-events/095)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed
- Report: Approved by Office Director
- Investigation class: Class 4 - Basic report with no Prelim publish
- NTSB office: Central Region
- Parties: Federal Aviation Administration
- NTSB case key (mKey): 103966
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=CEN21LA453
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/103966/pdf
- NTSB docket: https://data.ntsb.gov/Docket?ProjectID=103966
- Page: https://openairdocs.org/ntsb/CEN21LA453

## Probable cause

The pilot and flight instructor’s failure to ensure that the landing gear were extended prior to landing.

## Findings

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

- [Use of equip/info: use of equip/system](https://openairdocs.org/ntsb-findings/02063015): Personnel issues › Task performance · Pilot (probable cause); cases with it: [Beech M35, 4 cases](https://openairdocs.org/ntsb-findings/02063015/cases.md?model=1151526), [All aircraft, 1,391 cases](https://openairdocs.org/ntsb-findings/02063015/cases.md)
- [Landing gear system: main landing gear](https://openairdocs.org/ntsb-findings/01023210): Aircraft › Aircraft systems · Not used/operated (probable cause); cases with it: [Beech M35, 1 case](https://openairdocs.org/ntsb-findings/01023210/cases.md?model=1151526), [All aircraft, 241 cases](https://openairdocs.org/ntsb-findings/01023210/cases.md)
- [Use of equip/info: use of equip/system](https://openairdocs.org/ntsb-findings/02063015): Personnel issues › Task performance · Instructor/check pilot; cases with it: [Beech M35, 4 cases](https://openairdocs.org/ntsb-findings/02063015/cases.md?model=1151526), [All aircraft, 1,391 cases](https://openairdocs.org/ntsb-findings/02063015/cases.md)

## Sequence of events

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

- [Landing-flare/touchdown: Landing gear not configured](https://openairdocs.org/ntsb-events/095) (defining event); cases with it: [Beech M35, 1 case](https://openairdocs.org/ntsb-events/095/sequence.md?model=1151526), [All aircraft, 584 cases](https://openairdocs.org/ntsb-events/095/sequence.md)

## Analysis

The pilot and flight instructor were conducting a flight review when on the downwind leg of the airport traffic pattern the pilot reduced the throttle to idle to simulate an engine failure, but then inadvertently extended the flaps instead of the landing gear. While on short final, the pilot increased engine power to ensure that the airplane reached the runway and, as such, the landing gear horn did not sound. However, when engine power was subsequently reduced to idle before touch down, the pilot then heard the landing gear horn and the airplane landed on the runway with the landing gear retracted. The airplane came to rest on the runway and sustained substantial damage to the engine keel beam. The pilot and flight instructor both reported that there were no mechanical malfunctions or anomalies with the airplane that would have precluded normal operation.

## Aircraft

- Registration: [N9835R](https://openairdocs.org/aircraft/N9835R), registered now, S/N D-6359, built 1960 (OpenAirDocs)
- Reported make and model: BEECH M35
- Registry model: [Beech M35](https://openairdocs.org/model/beech-m35) (registry code 1151526) (OpenAirDocs)
- Registry engine: [Continental I0-470 series](https://openairdocs.org/engine/continental-i0-470-series) (registry code 17027, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: D-6359
- Year built: 1960
- Airframe hours: 3041.9
- Engines: Continental Motors IO-470C 250 horsepower reciprocating
- Damage: Substantial damage
- Flight: Instructional, Part 91
- Registered owner: Weidner Leonard M
- Airworthiness certificate: Standard, Normal
- Last inspection: Annual, April 23, 2021
- Departed: KSUS, Saint Louis, MO
- Destination: Same as departure
- Airport: K15, Grand Glaize-Osage Beach, runway 14/32, 3,205 × 60 ft, asphalt
- Equipment: ADS-B, Handheld GPS

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 39; injuries: none; private; airplane ratings: single-engine land; medical: class 3, with waivers/limitations; last flight review August 23, 2019; seat: left; restraint: lap only
- Flight instructor; age 38; injuries: none; commercial, airline transport, flight instructor; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, without waivers/limitations; last flight review January 24, 2021; seat: right; restraint: lap only; flight hours: 5,970 total, 36 in this make and model, 3,526 as pilot in command, 69 in the last 90 days, 17 in the last 30 days, 0 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Day
- Wind: 170° at 3 knots
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 75 °F, dew point 66 °F
- Altimeter: 30.12 inHg
- Observed at: KAIZ, 6 nm away
- METAR: KAIZ 171456Z AUTO 17003KT 10SM CLR 24/19 A3012 RMK AO2 SLP192 T02390194 51016

## 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 20210917015849A](https://openairdocs.org/incident/20210917015849A), Sep 17, 2021: Beech M35, Osage Beach, MO, Substantial damage. N9835R was involved in a gear up landing at the Osage Beach, MO airport on September 17, 2021. A flight instructor was conducting a flight review for a…

## Docket (3 files)

The files NTSB released with the investigation on October 14, 2021, on NTSB's docket system: https://data.ntsb.gov/Docket?ProjectID=103966. 10.9 MB in all.

- Pilot/operator aircraft accident report, NTSB form 6120.1 (pilot-owner) (item 1, PDF, 11 pages, 5.2 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=12767167&FileExtension=pdf&FileName=6120%20-%20Pilot%202_Redacted-Rel.pdf
- Pilot/operator aircraft accident report, NTSB form 6120.1 (CFI) (item 2, PDF, 11 pages, 5.2 MB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=12767669&FileExtension=pdf&FileName=6120%20-%20CFI%202_Redacted-Rel.pdf
- Photos (item 3, PDF, 5 pages, 542 KB): https://data.ntsb.gov/Docket/Document/docBLOB?ID=12767452&FileExtension=pdf&FileName=Photos-Rel.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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