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NTSB Report
August 20, 1992 · Bell XV-15 301 · N702NA
Arlington, TX
Overview
Report Status
Probable Cause
Event Type
Accident
Date
August 20, 1992
Injury Outcomes
2 injuries (2 minor injuries)
Location
Arlington, TX
Aircraft
Bell XV-15 301
Tail Number
N702NA
Operator
Bell Helicopter Textron
Injuries
Minor
Aircraft Damage
Destroyed
NTSB Number
FTW92FA215
DURING A DEMONSTRATION FLIGHT OF THE TILTROTOR AIRCRAFT, THE LEFT PROPROTOR GOVERNOR DISCONNECTED DUE TO A MISSING SAFETY ON THE CASTELLATED NUT THAT SECURES THE PROPROTOR TO THE GOVERNOR LINKAGE. WHEN THE GOVERNOR DISCONNECTED, THE PROPELLER SURGED TO THE MAXIMUM PITCH SETTING AND ROLLED THE AIRCRAFT AROUND THE LONGITUDINAL AXIS. FLIGHT DATA RECORDINGS INDICATED THAT THE AIRCRAFT EXPERIENCED A ROLL TO THE RIGHT THAT BEGAN SLOWLY AND ACCELERATED TO THE INVERTED POSITION IN LESS THAN 3 SECONDS. THE AIRCRAFT IMPACTED THE GROUND INVERTED. NEITHER OCCUPANT COULD EGRESS WITHOUT ASSISTANCE DUE TO INCONSISTENT INSTRUCTIONS FOR EMERGENCY EGRESS.
NTSB Probable Cause
INADEQUATE MAINTENANCE AND INSPECTION WHICH RESULTED IN A DISCONNECTED PROPROTOR GOVERNOR LINKAGE.
Full Narrative
DURING A DEMONSTRATION FLIGHT OF THE TILTROTOR AIRCRAFT, THE LEFT PROPROTOR GOVERNOR DISCONNECTED DUE TO A MISSING SAFETY ON THE CASTELLATED NUT THAT SECURES THE PROPROTOR TO THE GOVERNOR LINKAGE. WHEN THE GOVERNOR DISCONNECTED, THE PROPELLER SURGED TO THE MAXIMUM PITCH SETTING AND ROLLED THE AIRCRAFT AROUND THE LONGITUDINAL AXIS. FLIGHT DATA RECORDINGS INDICATED THAT THE AIRCRAFT EXPERIENCED A ROLL TO THE RIGHT THAT BEGAN SLOWLY AND ACCELERATED TO THE INVERTED POSITION IN LESS THAN 3 SECONDS. THE AIRCRAFT IMPACTED THE GROUND INVERTED. NEITHER OCCUPANT COULD EGRESS WITHOUT ASSISTANCE DUE TO INCONSISTENT INSTRUCTIONS FOR EMERGENCY EGRESS.
Flight
Event TypeAccident
Event Time11:03 CDT
Nearest AirportArlington Muni (0nm)
Runway0
Flight Plan FiledCvfr
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBell XV-15 301
Tail NumberN702NA
Aircraft CategoryUnknown
DamageDestroyed
OperatorBell Helicopter Textron
Operating RulePart 91
Engines2
Engine TypeTurboprop
Engine DetailsLycoming · LTC1K-4K · Turboprop · 1550
Seats2
People & Injuries
Injury Summary2 injuries (2 minor injuries)
Fatal0
Serious0
Minor2
Uninjured0
Total2
Crew 1Age 56 · Second Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility6 sm
CeilingNone
Temperature / Dew Point66 F
Altimeter30.00 inHg
Observation Time15:50
Weather SourceWFAC