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NTSB Report
June 5, 1987 · Beech B35 · N7973D
Keokuk, IA
Overview
Report Status
Preliminary report
Event Type
Accident
Date
June 5, 1987
Injury Outcomes
2 injuries (1 serious injury, 1 minor injury)
Location
Keokuk, IA
Aircraft
Beech B35
Tail Number
N7973D
Injuries
Serious
Aircraft Damage
Substantial
NTSB Number
MKC87LA119
THE PIC RPTD A LOSS OF MANIFOLD PRESS DURING CRUISE FLT AND AN INABILITY TO MAINTAIN ALT. A FORCED LNDG WAS MADE TO THE KEOKUK ARPT, BUT THE PIC STATED HE WAS TOO HIGH AND FAST FOR A LNDG. THE PIC MADE A GO-AROUND, BUT AGAIN APPROACHED TOO FAST. ANOTHER ATTEMPT WAS MADE TO GO-AROUND, BUT AN INCREASE IN THROTTLE PRODUCED NO ADD'TL PWR. THE PIC THEN VEERED TOWARDS AN OPEN AREA TO ATTEMPT A LNDG. THE ACFT IMPACTED AN AREA OF TREES AND FELL TO THE GRND. EXAM OF THE AIRCRAFT REVEALED THAT THE THROTTLE ARM WAS SLIPPING OVER THE SERRATED EDGES OF THE THROTTLE BODY SHAFT RESTRICTING FULL MOVEMENT OF THE THROTTLE SHAFT. CLOSEUP EXAM OF THIS ARM AND SHAFT REVEALED THAT THE CASTELATED NUT HAD BACKED OFF THE BOLT ALLOWING THE ARM TO LOOSEN. A COTTER PIN IS NORMALLY INSTALLED IN THE AREA OF THE CASTELATTED NUT TO PREVENT IT FROM BACKING OFF THE BOLT. THE BOLT AND NUT WERE FOUND STILL POSITIONED ON THE THROTTLE ARM, BUT THE COTTER PIN WAS NOT FOUND.
Full Narrative
THE PIC RPTD A LOSS OF MANIFOLD PRESS DURING CRUISE FLT AND AN INABILITY TO MAINTAIN ALT. A FORCED LNDG WAS MADE TO THE KEOKUK ARPT, BUT THE PIC STATED HE WAS TOO HIGH AND FAST FOR A LNDG. THE PIC MADE A GO-AROUND, BUT AGAIN APPROACHED TOO FAST. ANOTHER ATTEMPT WAS MADE TO GO-AROUND, BUT AN INCREASE IN THROTTLE PRODUCED NO ADD'TL PWR. THE PIC THEN VEERED TOWARDS AN OPEN AREA TO ATTEMPT A LNDG. THE ACFT IMPACTED AN AREA OF TREES AND FELL TO THE GRND. EXAM OF THE AIRCRAFT REVEALED THAT THE THROTTLE ARM WAS SLIPPING OVER THE SERRATED EDGES OF THE THROTTLE BODY SHAFT RESTRICTING FULL MOVEMENT OF THE THROTTLE SHAFT. CLOSEUP EXAM OF THIS ARM AND SHAFT REVEALED THAT THE CASTELATED NUT HAD BACKED OFF THE BOLT ALLOWING THE ARM TO LOOSEN. A COTTER PIN IS NORMALLY INSTALLED IN THE AREA OF THE CASTELATTED NUT TO PREVENT IT FROM BACKING OFF THE BOLT. THE BOLT AND NUT WERE FOUND STILL POSITIONED ON THE THROTTLE ARM, BUT THE COTTER PIN WAS NOT FOUND.
Flight
Event TypeAccident
Event Time09:45 CDT
Nearest AirportKeokuk Municipal (0nm N)
Runway31
Runway Length3800 ft
Runway Width100 ft
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBeech B35
Tail NumberN7973D
Aircraft CategoryAir
DamageSubstantial
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsContinental · O-470 · Reciprocating · 250
Seats4
People & Injuries
Injury Summary2 injuries (1 serious injury, 1 minor injury)
Fatal0
Serious1
Minor1
Uninjured0
Total2
Crew 1Age 62 · Third Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility15 sm
CeilingNone
Temperature / Dew Point0 C / 0 C
Altimeter0
Weather SourceWIT