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NTSB Report
April 26, 1982 · Aerospatiale AS-350D · N5784Y
Houston, TX
Overview
Report Status
Preliminary report
Event Type
Accident
Date
April 26, 1982
Injury Outcomes
No injuries (2 uninjured)
Location
Houston, TX
Aircraft
Aerospatiale AS-350D
Tail Number
N5784Y
Operator
Air-Op
Injuries
None
Aircraft Damage
Substantial
NTSB Number
FTW82DA150
THE PURPOSE OF THE FLIGHT WAS FOR THE PILOT TO PRACTICE MANEUVERS IN PREPARATION FOR A PART 135 CHECK RIDE. THE PILOT WAS PRACTICING POWER RECOVERY AUTOROTATIONS TO A HEIGHT OF ABOUT 5 FT AG. HE REPORTED THAT ON HIS FOURTH AUTOROTATION, THE ENGINE DID NOT ACCELERATE WHEN HE ATTEMPTED THE POWER RECOVERY. SUBSEQUENTLY, THE HELICOPTER FELL THROUGH THE RECOVERY AND LANDED HARD. DURING THE INVESTIGATION, THE ENGINE FUEL CONTROL AND POWER TURBINE GOVERNOR WERE REMOVED FOR EXAMINATION. THE GOVERNOR WAS FOUND TO BE WITHIN SPECIFICATIONS. HOWEVER, AN EXAMINATION OF THE FUEL CONTROL UNIT REVEALED THE PX TRIM BLEED PART WAS OVERSIZE. THE SPECIFICATION CALLED FOR A SIZE #64 TO #68 PART, BUT A #61 PART WAS INSTALLED. ALSO, THERE WAS SOME WEAR ON THE BELLOWS. ACCORDING TO BENDIX CORP, THE OVERSIZE PART AND WEAR WOULD HAVE LEANED THE MIXTURE, BUT WOULD NOT HAVE CAUSED THE POWER LOSS.
Full Narrative
THE PURPOSE OF THE FLIGHT WAS FOR THE PILOT TO PRACTICE MANEUVERS IN PREPARATION FOR A PART 135 CHECK RIDE. THE PILOT WAS PRACTICING POWER RECOVERY AUTOROTATIONS TO A HEIGHT OF ABOUT 5 FT AG. HE REPORTED THAT ON HIS FOURTH AUTOROTATION, THE ENGINE DID NOT ACCELERATE WHEN HE ATTEMPTED THE POWER RECOVERY. SUBSEQUENTLY, THE HELICOPTER FELL THROUGH THE RECOVERY AND LANDED HARD. DURING THE INVESTIGATION, THE ENGINE FUEL CONTROL AND POWER TURBINE GOVERNOR WERE REMOVED FOR EXAMINATION. THE GOVERNOR WAS FOUND TO BE WITHIN SPECIFICATIONS. HOWEVER, AN EXAMINATION OF THE FUEL CONTROL UNIT REVEALED THE PX TRIM BLEED PART WAS OVERSIZE. THE SPECIFICATION CALLED FOR A SIZE #64 TO #68 PART, BUT A #61 PART WAS INSTALLED. ALSO, THERE WAS SOME WEAR ON THE BELLOWS. ACCORDING TO BENDIX CORP, THE OVERSIZE PART AND WEAR WOULD HAVE LEANED THE MIXTURE, BUT WOULD NOT HAVE CAUSED THE POWER LOSS.
Flight
Event TypeAccident
Event Time15:45 CDT
Nearest AirportCypress (Closed) (0nm N)
Runway27
Runway Length3000 ft
Runway Width50 ft
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftAerospatiale AS-350D
Tail NumberN5784Y
Aircraft CategoryHeli
DamageSubstantial
OperatorAir-Op
Operating RulePart 91
Engines1
Engine TypeTurboshaft
Engine DetailsLycoming · LTS-101-600A2 · Turboshaft · 531
Seats6
People & Injuries
Injury SummaryNo injuries (2 uninjured)
Fatal0
Serious0
Minor0
Uninjured2
Total2
Crew 1Age 46 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind325° @ 5 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point16 C / 0 C
Altimeter29.00 inHg
Observation Time15:45