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Aviation safety reports, made easier to study

NTSB Reports is an independent research and search tool for public aviation accident and incident records. It brings NTSB aviation reports, structured fields, docket files, extracted figures, photos, videos, and update history into one searchable interface.

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NTSB Report

March 18, 1983 · Cessna 421C · N67943

Gunnison, CO

Overview

Report Status
Preliminary report
Event Type
Accident
Date
March 18, 1983
Injury Outcomes
No injuries (7 uninjured)
Location
Gunnison, CO
Aircraft
Cessna 421C
Tail Number
N67943
Injuries
None
Aircraft Damage
Substantial
NTSB Number
DEN83LA081

THE PLT BEGAN TAKING OFF ON RWY 06 WITH A WIND FROM 190 DEG AT 8 KTS. HE STATED THAT MAX POWER & RPM WERE OBTAINED. HE NOTED THAT HE OBTAINED 39 INCHES OF MANIFOLD PRESSURE & 2235 RPM AT 100 KTS IAS. REPORTEDLY, THE ACFT ROTATED PROPERLY, BUT BEGAN TO VIBRATE & SHUDDER & WOULD NOT LIFT OFF. THE PLT THEN LOWERED THE NOSE & ACCELERATED TO 110 KTS IAS. HOWEVER, AGAIN, THE ACFT WOULD ONLY VIBRATE & SHUDDER & WOULD NOT LIFT OFF. THE PLT THEN BEGAN ABORTING THE TAKEOFF. THE ACFT WENT OFF THE END OF THE RWY AT 70 TO 80 KTS & BECAME AIRBORNE FOR APRX 75 FT AS IT WENT OVER A DROP OFF IN THE TERRAIN. SUBSEQUENTLY, THE ACFT LANDED IN SOFT SOIL & HIGH GRASS WHERE THE GEAR COLLAPSED. AN INVESTIGATION REVEALED THAT THE TEMP WAS 30 DEG & SNOW WAS FALLING. THE PLT BELIEVED THE ACCIDENT RESULTED FROM COLD TEMPS ALONG WITH WATER BLOWN ONTO THE TAIL SURFACES OF THE ACFT. HE DID NOT DESCRIBE THE SURFACE CONDITION ON THE WINGS. STALL SPEED FOR THIS ACFT WAS 86 KTS AT THE MAX GROSS WT & WAS WITH WT & BALANCE LIMITS.

Full Narrative

THE PLT BEGAN TAKING OFF ON RWY 06 WITH A WIND FROM 190 DEG AT 8 KTS. HE STATED THAT MAX POWER & RPM WERE OBTAINED. HE NOTED THAT HE OBTAINED 39 INCHES OF MANIFOLD PRESSURE & 2235 RPM AT 100 KTS IAS. REPORTEDLY, THE ACFT ROTATED PROPERLY, BUT BEGAN TO VIBRATE & SHUDDER & WOULD NOT LIFT OFF. THE PLT THEN LOWERED THE NOSE & ACCELERATED TO 110 KTS IAS. HOWEVER, AGAIN, THE ACFT WOULD ONLY VIBRATE & SHUDDER & WOULD NOT LIFT OFF. THE PLT THEN BEGAN ABORTING THE TAKEOFF. THE ACFT WENT OFF THE END OF THE RWY AT 70 TO 80 KTS & BECAME AIRBORNE FOR APRX 75 FT AS IT WENT OVER A DROP OFF IN THE TERRAIN. SUBSEQUENTLY, THE ACFT LANDED IN SOFT SOIL & HIGH GRASS WHERE THE GEAR COLLAPSED. AN INVESTIGATION REVEALED THAT THE TEMP WAS 30 DEG & SNOW WAS FALLING. THE PLT BELIEVED THE ACCIDENT RESULTED FROM COLD TEMPS ALONG WITH WATER BLOWN ONTO THE TAIL SURFACES OF THE ACFT. HE DID NOT DESCRIBE THE SURFACE CONDITION ON THE WINGS. STALL SPEED FOR THIS ACFT WAS 86 KTS AT THE MAX GROSS WT & WAS WITH WT & BALANCE LIMITS.

Flight

Event TypeAccident
Event Time16:45 MST
Nearest AirportGUNNISON (0nm N)
Runway6
Runway Length7198 ft
Runway Width100 ft
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo

Aircraft

AircraftCessna 421C
Tail NumberN67943
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 91
Engines2
Engine TypeReciprocating
Engine DetailsContinental · IO-520-N · Reciprocating · 365
Seats8

People & Injuries

Injury SummaryNo injuries (7 uninjured)
Fatal0
Serious0
Minor0
Uninjured7
Total7
Crew 1Age 32 · Second Class

Conditions

ConditionsVMC
LightDaylight
Wind190° @ 8 kt
Visibility15 sm
CeilingOvercast 5000 ft
Temperature / Dew Point30 C / 30 C
Altimeter29.00 inHg
Observation Time23:50
Weather SourceWFAC

Appendix: Source Data