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NTSB Report
May 16, 1991 · Beech V35B · N9435Q
Manor, TX
Overview
Report Status
Probable Cause
Event Type
Accident
Date
May 16, 1991
Injury Outcomes
4 injuries (4 fatalities)
Location
Manor, TX
Aircraft
Beech V35B
Tail Number
N9435Q
Operator
Bonanza 9435 Quebec
Injuries
Fatal
Aircraft Damage
Destroyed
NTSB Number
FTW91FA080
THE PLT LOST CTL OF THE ACFT IN IFR CONDS AS THE PLANE WAS DSCNDG THRU ABT 6000' MSL, IN AN AREA OF CONVECTIVE ACTIVITY WITH MODERATE TO SEVERE TURBC & UP/DOWN DRAFTS. BOTH WINGS SEPD FM THE ACFT & WRECKAGE WAS SCATTERED OVER AN AREA OF APRX 1.5 MI. CALCULATIONS SHOWED THAT AT THE TIME OF THE ACDNT, THE ACFT'S GROSS WT WAS 29 LBS OVER ITS MAX LIMIT, AND THE CENTER-OF-GRAVITY (CG) WAS ABT 3.3 TO 5.3 INCHES BEHIND THE AFT LIMIT. UNDER THESE CONDS, THE ACFT'S MANEUVERING STABILITY & STICK FORCE PER 'G' CHARACTERISTICS WOULD HAVE BEEN SERIOUSLY DEGRADED. IN TURN, THIS WOULD HAVE ALLOWED THE PLT TO EXCEED THE STRUCTURAL DESIGN LIMITS OF THE ACFT WITH LITTLE OR NO EFFORT. AN EXAM OF THE WRECKAGE DISCLOSED EVIDENCE OF APPARENT FLAP ASYMMETRY, A COND WHICH WAY HAVE OCCURRED DRG THE IN-FLT BREAKUP OF THE ACFT.
NTSB Probable Cause
THE PILOT'S OPERATION OF THE AIRCRAFT AT A GROSS WEIGHT AND CENTER OF GRAVITY WHICH EXCEEDED THE CERTIFICATED OPERATING LIMITATIONS, RESULTING IN LOSS OF CONTROL AND STRUCTURAL OVERLOAD. TURBULENCE WAS A RELATED FACTOR.
Full Narrative
THE PLT LOST CTL OF THE ACFT IN IFR CONDS AS THE PLANE WAS DSCNDG THRU ABT 6000' MSL, IN AN AREA OF CONVECTIVE ACTIVITY WITH MODERATE TO SEVERE TURBC & UP/DOWN DRAFTS. BOTH WINGS SEPD FM THE ACFT & WRECKAGE WAS SCATTERED OVER AN AREA OF APRX 1.5 MI. CALCULATIONS SHOWED THAT AT THE TIME OF THE ACDNT, THE ACFT'S GROSS WT WAS 29 LBS OVER ITS MAX LIMIT, AND THE CENTER-OF-GRAVITY (CG) WAS ABT 3.3 TO 5.3 INCHES BEHIND THE AFT LIMIT. UNDER THESE CONDS, THE ACFT'S MANEUVERING STABILITY & STICK FORCE PER 'G' CHARACTERISTICS WOULD HAVE BEEN SERIOUSLY DEGRADED. IN TURN, THIS WOULD HAVE ALLOWED THE PLT TO EXCEED THE STRUCTURAL DESIGN LIMITS OF THE ACFT WITH LITTLE OR NO EFFORT. AN EXAM OF THE WRECKAGE DISCLOSED EVIDENCE OF APPARENT FLAP ASYMMETRY, A COND WHICH WAY HAVE OCCURRED DRG THE IN-FLT BREAKUP OF THE ACFT.
Flight
Event TypeAccident
Event Time10:20 CDT
Nearest Airport0nm N
Runway0
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBeech V35B
Tail NumberN9435Q
Aircraft CategoryAir
DamageDestroyed
OperatorBonanza 9435 Quebec
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsContinental · IO-520-BA · Reciprocating · 285
Seats4
People & Injuries
Injury Summary4 injuries (4 fatalities)
Fatal4
Serious0
Minor0
Uninjured0
Total4
Crew 1Age 36 · Third Class
Conditions
ConditionsVMC
LightDaylight
Wind210° @ 9 kt
Visibility5 sm
CeilingBroken clouds 1700 ft
Altimeter29.00 inHg
Weather SourceWIT