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NTSB Report
October 21, 1984 · Beech 99A · N1921T
Fort Morgan, CO
Overview
Report Status
Preliminary report
Event Type
Incident
Date
October 21, 1984
Injury Outcomes
No injuries (6 uninjured)
Location
Fort Morgan, CO
Aircraft
Beech 99A
Tail Number
N1921T
Operator
Pioneer Airways
Injuries
None
Aircraft Damage
Minor
NTSB Number
DEN85IA016
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.
Full Narrative
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.
Flight
Event TypeIncident
Event Time15:12 MDT
Nearest Airport0nm N
Runway0
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBeech 99A
Tail NumberN1921T
Aircraft CategoryAir
DamageMinor
OperatorPioneer Airways
Operating RulePart 135
Engines2
Engine TypeTurboprop
Engine DetailsP&W · PT6A-28 · Turboprop · 550
Seats17
People & Injuries
Injury SummaryNo injuries (6 uninjured)
Fatal0
Serious0
Minor0
Uninjured6
Total6
Crew 1Age 43 · First Class
Conditions
ConditionsIMC
LightDaylight
Wind7° @ 7 kt
Visibility10 sm
CeilingBroken clouds 10000 ft
Temperature / Dew Point28 C / 70 F
Altimeter30.00 inHg
Observation Time21:52
Weather SourceWFAC