# NTSB DEN91LA054: Beech H35, N5463D, Greeley, CO, March 24, 1991

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Limited investigation · Final report
- Date: March 24, 1991, 12:12 local (19:12 UTC)
- Place: Greeley, CO
- Coordinates: 40.440944, -104.669914 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=40.4409&lon=-104.6699&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed, report May 3, 1993
- Report: Approved by Office Director
- NTSB case key (mKey): 18077
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN91LA054
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/18077/pdf
- Page: https://openairdocs.org/ntsb/DEN91LA054

## Probable cause

THE PILOT'S INADVERTENT ACTIVATION OF THE LANDING GEAR SWITCH CAUSING THE LANDING GEAR TO COLLAPSE WHILE THE AIRCRAFT WAS STILL ON THE LANDING ROLL.

## Sequence of events

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

- Gear collapsed, landing - roll
  - gear retraction - inadvertent activation, pilot in command (cause)

## Analysis

DURING A NORMAL FULL STOP LANDING, THE PILOT INADVERTENTLY ACTIVATED THE LANDING GEAR SWITCH WHILE THE AIRCRAFT WAS STILL ON THE LANDING ROLL. THE GEAR COLLAPSED CAUSING SUBSTANTIAL DAMAGE TO THE LANDING GEAR SYSTEM. NO MALFUNCTION IN THE LANDING GEAR SYSTEM WAS FOUND.

## Aircraft

- Registration: [N5463D](https://openairdocs.org/aircraft/N5463D), registered now, S/N D-4959, built 1957 (OpenAirDocs)
- Reported make and model: BEECH H35
- Registry model: [Beech H35](https://openairdocs.org/model/beech-h35) (registry code 1151520) (OpenAirDocs)
- Registry engine: [Continental O-470 series](https://openairdocs.org/engine/continental-o-470-series) (registry code 17026, reciprocating) (OpenAirDocs)
- Category: Airplane
- Serial number: D-4959
- Engines: CONTINENTAL O-470 250 horsepower reciprocating
- Damage: Substantial damage
- Flight: Personal, Part 91
- Operator: Wallace L. Newbold
- Registered owner: Wallace L. Newbold
- Airport: GXY, Greeley-Weld County, runway 17, 3,600 × 75 ft, asphalt

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 67; commercial; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: left; flight hours: 5,900 total, 3,900 in this make and model, 5,700 as pilot in command, 15 in the last 90 days, 7 in the last 30 days

## Weather

- Conditions: Visual (VMC), Day
- Wind: 180° at 5 knots
- Visibility: 30 statute miles
- Lowest ceiling: none
- Temperature: -0 °F, dew point -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 19910324046769A](https://openairdocs.org/incident/19910324046769A), Mar 24, 1991: Beech H35, Greeley, CO, Substantial damage. Landing gear collapsed on landing roll. Failed to check down and locked. Damage indicates gear in transit landing.

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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