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NTSB Report
July 2, 1992 · Bernard W Resnik Acro-Special Acro-Speci · N79WA
Earlham, IA
Overview
Report Status
Probable Cause
Event Type
Accident
Date
July 2, 1992
Injury Outcomes
2 injuries (1 serious injury, 1 minor injury)
Location
Earlham, IA
Aircraft
Bernard W Resnik Acro-Special Acro-Speci
Tail Number
N79WA
Operator
Price James F
Injuries
Serious
Aircraft Damage
Substantial
NTSB Number
CHI92DCD07
THE HOMEBUILT ACCIDENT AIRPLANE LOST ENGINE POWER DURING INITIAL CLIMB FROM TAKEOFF. IT COLLIDED WITH TREES AND TERRAIN DURING A FORCED LANDING. THE PILOT DESCRIBED HOW HE HAD BEEN FLYING ABOUT 45 MINUTES AND HAD DONE TWO LANDINGS AND TAKEOFFS. DURING THE THIRD TAKEOFF THE AIRPLANE HAD CLIMBED ABOUT 75 TO 100 FEET WHEN THE ENGINE LOST POWER. EXAMINATION OF THE CARBURETOR AIR BOX REVEALED A FLAPPER VALVE IN THE AIR BOX HAD BROKEN. THE VALVE PLATE WAS FREE TO MOVE ABOUT IN THE SPACE BETWEEN THE SHAFT AND THE CARBURETOR AIR INTAKE. THE PLATE HAD BEEN SECURED TO THE SHAFT WITH TWO SPOT WELDS. THE SURFACE OF THE BROKEN WELDS APPEARED DULL EXCEPT FOR A SMALL PORTION ON ONE WELD WHERE THE BREAK APPEARED SHINY. THE CARBURETOR AIR BOX HAD BEEN PURCHASED FROM AN AIRCRAFT SALVAGE OPERATOR FOR INSTALLATION ON THE AIRPLANE.
NTSB Probable Cause
A LOSS OF TOTAL ENGINE POWER WHEN A FAILED FLAPPER VALVE IN THE AIR BOX BLOCKED THE FLOW OF AIR THROUGH THE CARBURETOR THROAT.
Full Narrative
THE HOMEBUILT ACCIDENT AIRPLANE LOST ENGINE POWER DURING INITIAL CLIMB FROM TAKEOFF. IT COLLIDED WITH TREES AND TERRAIN DURING A FORCED LANDING. THE PILOT DESCRIBED HOW HE HAD BEEN FLYING ABOUT 45 MINUTES AND HAD DONE TWO LANDINGS AND TAKEOFFS. DURING THE THIRD TAKEOFF THE AIRPLANE HAD CLIMBED ABOUT 75 TO 100 FEET WHEN THE ENGINE LOST POWER. EXAMINATION OF THE CARBURETOR AIR BOX REVEALED A FLAPPER VALVE IN THE AIR BOX HAD BROKEN. THE VALVE PLATE WAS FREE TO MOVE ABOUT IN THE SPACE BETWEEN THE SHAFT AND THE CARBURETOR AIR INTAKE. THE PLATE HAD BEEN SECURED TO THE SHAFT WITH TWO SPOT WELDS. THE SURFACE OF THE BROKEN WELDS APPEARED DULL EXCEPT FOR A SMALL PORTION ON ONE WELD WHERE THE BREAK APPEARED SHINY. THE CARBURETOR AIR BOX HAD BEEN PURCHASED FROM AN AIRCRAFT SALVAGE OPERATOR FOR INSTALLATION ON THE AIRPLANE.
Flight
Event TypeAccident
Event Time20:40 CDT
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBernard W Resnik Acro-Special Acro-Speci
Tail NumberN79WA
Aircraft CategoryAir
DamageSubstantial
OperatorPrice James F
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · O-320-E2D · Reciprocating · 150
Seats2
People & Injuries
Injury Summary2 injuries (1 serious injury, 1 minor injury)
Fatal0
Serious1
Minor1
Uninjured0
Total2
Crew 1Age 45 · Third Class
Conditions
ConditionsVMC
LightDusk
Wind180° @ 7 kt
Visibility7 sm
CeilingBroken clouds 8500 ft
Temperature / Dew Point66 F
Altimeter29.00 inHg
Observation Time01:50
Weather SourceWFAC