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NTSB Report
September 23, 1991 · Cessna 177 · N3314T
Snohomish, WA
Overview
Report Status
Probable Cause
Event Type
Accident
Date
September 23, 1991
Injury Outcomes
No injuries (2 uninjured)
Location
Snohomish, WA
Aircraft
Cessna 177
Tail Number
N3314T
Operator
Sigmet
Injuries
None
Aircraft Damage
Substantial
NTSB Number
SEA91LA249
DURING CRUISE A PARTIAL POWER LOSS OCCURRED AND THE PILOT, UNABLE TO REACH A SUITABLE AIRPORT, EXECUTED A FORCED LANDING. POST CRASH EXAMINATION REVEALED THAT THE MIXTURE CONTROL CABLE CORE HAD SEPARATED AT THE MIXTURE CONTROL ARM BOLT ADJACENT TO THE CARBURETOR. ADDITIONALLY, THE ADEL CLAMP ASSEMBLY RETAINING THE MIXTURE CONTROL CABLE NEAR THE MIXTURE CONTROL ARM WAS OBSERVED TO BE SEPARATED. THE SEPARATED CABLE CORE WAS DUE TO REVERSE BENDING FATIGUE CRACKING CONSISTENT WITH EXCESSIVE VIBRATORY LOADS APPLIED TO THE CABLE AS A RESULT OF THE SEPARATED ADEL CLAMP ASSEMBLY. THE SEPARATED ADEL CLAMP WAS DUE TO EXCESSIVE TWISTING LOADS APPLIED TO THE CLAMP. DURING THE FORCED LANDING ROLLOUT, WHICH WAS EXECUTED ON ROUGH TERRAIN, THE NOSE WHEEL ASSEMBLY COLLAPSED.
NTSB Probable Cause
THE SEPARATION OF THE MIXTURE CONTROL CABLE (CORE) RESULTING FROM SEPARATION OF THE ADEL CLAMP ASSEMBLY AND IMPROPER ADJUSTMENT BY MAINTENANCE PERSONNEL.
Full Narrative
DURING CRUISE A PARTIAL POWER LOSS OCCURRED AND THE PILOT, UNABLE TO REACH A SUITABLE AIRPORT, EXECUTED A FORCED LANDING. POST CRASH EXAMINATION REVEALED THAT THE MIXTURE CONTROL CABLE CORE HAD SEPARATED AT THE MIXTURE CONTROL ARM BOLT ADJACENT TO THE CARBURETOR. ADDITIONALLY, THE ADEL CLAMP ASSEMBLY RETAINING THE MIXTURE CONTROL CABLE NEAR THE MIXTURE CONTROL ARM WAS OBSERVED TO BE SEPARATED. THE SEPARATED CABLE CORE WAS DUE TO REVERSE BENDING FATIGUE CRACKING CONSISTENT WITH EXCESSIVE VIBRATORY LOADS APPLIED TO THE CABLE AS A RESULT OF THE SEPARATED ADEL CLAMP ASSEMBLY. THE SEPARATED ADEL CLAMP WAS DUE TO EXCESSIVE TWISTING LOADS APPLIED TO THE CLAMP. DURING THE FORCED LANDING ROLLOUT, WHICH WAS EXECUTED ON ROUGH TERRAIN, THE NOSE WHEEL ASSEMBLY COLLAPSED.
Flight
Event TypeAccident
Event Time19:15 PDT
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftCessna 177
Tail NumberN3314T
Aircraft CategoryAir
DamageSubstantial
OperatorSigmet
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-360-A1A · Reciprocating · 180
Seats4
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 58 · Third Class
Conditions
ConditionsVMC
LightDusk
Wind320° @ 6 kt
Visibility10 sm
CeilingOvercast 15000 ft
Temperature / Dew Point59 / 50
Altimeter30.00 inHg
Observation Time02:45
Weather SourceWFAC