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NTSB Report
July 5, 1987 · Kiesel Midget Mustang Midget MUS · N68WK
Window Rock, AZ
Overview
Report Status
Preliminary report
Event Type
Accident
Date
July 5, 1987
Injury Outcomes
1 injury (1 minor injury)
Location
Window Rock, AZ
Aircraft
Kiesel Midget Mustang Midget MUS
Tail Number
N68WK
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
LAX87DUJ07
THE AIRCRAFT LOST POWER SHORTLY AFTER TAKEOFF AND COLLIDED WITH A DIRT BANK DURING THE SUBSEQUENT FORCED LANDING. ENGINEEXAMINATION REVEALED AN OPEN INTAKE VALVE ON THE NUMBER 4 CYLINDER AND THE PILOT STATED A 'BENT AND CRACKED CRANKSHAFT FROM A PRIOR ACCIDENT' WAS DISCOVERED DURING THE ENGINE EXAMINATION. THE ENGINE MANUFACTURER STATED THAT AN OPEN INTAKE VALVE COULD INDUCE SIGNIFICANT POWER LOSS BY ALLOWING EXHAUST GASSES TO PRESSURIZE THE INTAKE MANIFOLD, THEREBY ALTERINGTHE FUEL/AIR MIXTURE. THE MAINTENANCE RECORDS ESTABLISHED THAT THE AIRCRAFT HAD FLOWN ONLY NINE HOURS SINCE THE LAST CONDITION INSPECTION.
Full Narrative
THE AIRCRAFT LOST POWER SHORTLY AFTER TAKEOFF AND COLLIDED WITH A DIRT BANK DURING THE SUBSEQUENT FORCED LANDING. ENGINEEXAMINATION REVEALED AN OPEN INTAKE VALVE ON THE NUMBER 4 CYLINDER AND THE PILOT STATED A 'BENT AND CRACKED CRANKSHAFT FROM A PRIOR ACCIDENT' WAS DISCOVERED DURING THE ENGINE EXAMINATION. THE ENGINE MANUFACTURER STATED THAT AN OPEN INTAKE VALVE COULD INDUCE SIGNIFICANT POWER LOSS BY ALLOWING EXHAUST GASSES TO PRESSURIZE THE INTAKE MANIFOLD, THEREBY ALTERINGTHE FUEL/AIR MIXTURE. THE MAINTENANCE RECORDS ESTABLISHED THAT THE AIRCRAFT HAD FLOWN ONLY NINE HOURS SINCE THE LAST CONDITION INSPECTION.
Flight
Event TypeAccident
Event Time08:30 MST
Nearest AirportWindow Rock (0nm N)
Runway2
Runway Length7000 ft
Runway Width80 ft
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftKiesel Midget Mustang Midget MUS
Tail NumberN68WK
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-235-C · Reciprocating · 115
Seats1
People & Injuries
Injury Summary1 injury (1 minor injury)
Fatal0
Serious0
Minor1
Uninjured0
Total1
Crew 1Age 40 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind240°
Visibility50 sm
CeilingNone
Temperature / Dew Point68 F / 21 C
Altimeter30.00 inHg
Observation Time15:00
Weather SourceWFAC