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NTSB Report
June 12, 1991 · Boeing DHC-6-300 · N242CA
Denver, CO
Overview
Report Status
Probable Cause
Event Type
Accident
Date
June 12, 1991
Injury Outcomes
No injuries (2 uninjured)
Location
Denver, CO
Aircraft
Boeing DHC-6-300
Tail Number
N242CA
Operator
Corporate Air
Injuries
None
Aircraft Damage
Substantial
NTSB Number
DEN91LA082
AT DAWN, THE PILOT AND A MECHANIC WENT OUT TO PREFLIGHT THE AIRCRAT AND THEN FLY IT ON A LOCAL MAINTENANCE TEST FLIGHT. THE HYDRAULIC SYSTEM CIRCUIT BREAKER WAS NOT 'IN' WHEN THE AIRCRAFT ENGINES WERE STARTED. AS THE RIGHT ENGINE RPM BEGAN TO INCREASE, THE AIRCRAFT STARTED TO MOVE FORWARD. THE PILOT APPLIED THE BRAKES ONLY TO DISCOVER THERE WAS NO HYDRAULIC PRESSURE IN THE BRAKE LINES. BEFORE CORRECTIVE ACTION COULD BE TAKEN, THE AIRCRAFT STRUCK A PARKED AIRCRAFT.
NTSB Probable Cause
THE PILOT'S FAILURE TO PERFORM AN ADEQUATE PREFLIGHT, I.E., NOT FOLLOWING THE CHECK LIST AND THE NORMAL BRAKE SYSTEM WAS INOPERATIVE AS A RESULT OF NO HYDRAULIC SYSTEM PRESSURE (HYDRAULIC SYSTEM CIRCUIT BREAKER NOT 'IN').
Full Narrative
AT DAWN, THE PILOT AND A MECHANIC WENT OUT TO PREFLIGHT THE AIRCRAT AND THEN FLY IT ON A LOCAL MAINTENANCE TEST FLIGHT. THE HYDRAULIC SYSTEM CIRCUIT BREAKER WAS NOT 'IN' WHEN THE AIRCRAFT ENGINES WERE STARTED. AS THE RIGHT ENGINE RPM BEGAN TO INCREASE, THE AIRCRAFT STARTED TO MOVE FORWARD. THE PILOT APPLIED THE BRAKES ONLY TO DISCOVER THERE WAS NO HYDRAULIC PRESSURE IN THE BRAKE LINES. BEFORE CORRECTIVE ACTION COULD BE TAKEN, THE AIRCRAFT STRUCK A PARKED AIRCRAFT.
Flight
Event TypeAccident
Event Time05:00 MDT
Nearest AirportStapleton International (0nm N)
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBoeing DHC-6-300
Tail NumberN242CA
Aircraft CategoryAir
DamageSubstantial
OperatorCorporate Air
Operating RulePart 91
Engines2
Engine TypeTurboprop
Engine DetailsP&W · PT6-27 · Turboprop · 680
Seats2
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 29 · First Class
Conditions
ConditionsVMC
LightDawn
WindCalm
Visibility15 sm
CeilingNone
Temperature / Dew Point0 C / 0 C
Altimeter0
Weather SourcePILO