# NTSB DEN85IA016: Beech 99A, N1921T, Fort Morgan, CO, October 21, 1984

- Type: NTSB incident investigation
- Classification: Incident · No injuries · Incident investigation · Final report
- Date: October 21, 1984, 15:12 local (21:12 UTC)
- Place: Fort Morgan, CO
- Coordinates: 40.260932, -103.789474 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=40.2609&lon=-103.7895&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: No injuries
- Injuries: 6 uninjured
- Status: Completed
- Report: Approved by Office Director
- NTSB case key (mKey): 16578
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DEN85IA016
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/16578/pdf
- Page: https://openairdocs.org/ntsb/DEN85IA016

## Sequence of events

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

- Loss of engine power(total) - mech failure/malf, climb
  - weather condition - carburetor icing conditions
  - weather condition - low ceiling
  - compressor assembly,blade - fatigue (cause)
- Forced landing, descent - emergency
- On ground/water encounter with terrain/water, landing
  - nacelle/pylon - crop (contributing factor)

## Analysis

CAPTAIN SHUTDOWN RT ENGINE IN-FLIGHT DUE TO A SURGING AND VIBRATION PROBLEM. THE AIRCRAFT WAS IN MODERATE ICING CONDITIONS AT THE TIME OF THE ENGINE SHUTDOWN. THE CAPTAIN WAS UNABLE TO MAINTAIN ALTITUDE AND AN EMERGENCY LANDING WAS MADE IN A CORN FIELD. POST INCIDENT EXAMINATION OF THE RT ENGINE REVEALED THAT A COMPRESSOR TURBINE BLADE HAD FAILED IN FATIGUE, CAUSING ADDITIONAL DAMAGE TO THE REMAINING BLADES. APPROXIMATELY 1 1/2 TO 2 INCHES OF ICE WERE FOUND ON VARIOUS UNPROTECTED AREAS OF THE AIRCRAFT.

## Aircraft

- Registration: N1921T (not matched to a registry record)
- Reported make and model: BEECH 99A
- Category: Airplane
- Serial number: U-128
- Airframe hours: 20030
- Engines: P&W PT6A-28 550 horsepower turbo prop
- Damage: Minor damage
- Flight: Part 135
- Operator: Pioneer Airways, Inc.
- Registered owner: Pioneer Airways, Inc.
- Airworthiness certificate: Standard, Normal
- Last inspection: Continuous airworthiness, October 15, 1984, 31 hours before
- Departed: DEN, DENVER, CO
- Destination: SNY, SYDNEY, NE
- Flight plan: IFR

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 43; airline transport, flight instructor; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 1, valid medical--w/ waivers/lim; seat: left; flight hours: 8,790 total, 18 in this make and model, 8,417 as pilot in command

## Weather

- Conditions: Instrument (IMC), Day
- Wind: 7° at 7 knots
- Visibility: 10 statute miles
- Lowest ceiling: 10,000 ft broken
- Temperature: 28 °F, dew point 70 °F
- Altimeter: 30.00 inHg
- Observed at: AKO

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Incident 19841021076049I](https://openairdocs.org/incident/19841021076049I), Oct 21, 1984: Beech B99, Fort Morgan, CO, Substantial damage. Right engine compressor turbine blade failed. Unable to maintain altitude with icing, landed gear up in cornfield.

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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