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Aviation safety reports, made easier to study

NTSB Reports is an independent research and search tool for public aviation accident and incident records. It brings NTSB aviation reports, structured fields, docket files, extracted figures, photos, videos, and update history into one searchable interface.

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June 10, 1984 · Aerospatiale SA-315B · N29907

Salina, UT

Overview

Report Status
Preliminary report
Event Type
Accident
Date
June 10, 1984
Injury Outcomes
No injuries (3 uninjured)
Location
Salina, UT
Aircraft
Aerospatiale SA-315B
Tail Number
N29907
Injuries
None
Aircraft Damage
Substantial
NTSB Number
DEN84LA175

THE ACFT WAS ON A MAINTENANCE CHECK FLT AFTER THE MAIN ROTOR SHAFT ASSEMBLY THRUST BEARING HAD BEEN REPLACED AFTER THE ACFT HAD YAWING PROBLEMS AND POPPING SOUNDS AT HIGH PITCH SETTINGS WHILE LIFTINGS LOADS. THE PLT TRIED TO DUPLICATE THE CONDITIONS FOR THE TEST AND AS COLLECTIVE PITCH WAS INCREASED A LOUD BANG WAS HEARD FROM THE TRANSMISSION AREA AND THE ACFT LOST POWER. THE ACFT DID NOT RESPOND TO THE CONTROLS, ACCODING TO THE PLT, WHEN HE TRIED TO KEEP THE ACFT LEVEL AND CONTROL THE RATE OF DESCENT. WHEN GROUND CONTACT WAS MADE THE ACFT BOUNCED AND ROLLED OVER. A TEARDOWN OF THE CLUTCHAND TRANSMISSION WAS ACCOMPLISHED AND THERE WAS NO EVIDENCE OF ANY MECHANICAL FAILURES OR MALFUNCTIONS.

Full Narrative

THE ACFT WAS ON A MAINTENANCE CHECK FLT AFTER THE MAIN ROTOR SHAFT ASSEMBLY THRUST BEARING HAD BEEN REPLACED AFTER THE ACFT HAD YAWING PROBLEMS AND POPPING SOUNDS AT HIGH PITCH SETTINGS WHILE LIFTINGS LOADS. THE PLT TRIED TO DUPLICATE THE CONDITIONS FOR THE TEST AND AS COLLECTIVE PITCH WAS INCREASED A LOUD BANG WAS HEARD FROM THE TRANSMISSION AREA AND THE ACFT LOST POWER. THE ACFT DID NOT RESPOND TO THE CONTROLS, ACCODING TO THE PLT, WHEN HE TRIED TO KEEP THE ACFT LEVEL AND CONTROL THE RATE OF DESCENT. WHEN GROUND CONTACT WAS MADE THE ACFT BOUNCED AND ROLLED OVER. A TEARDOWN OF THE CLUTCHAND TRANSMISSION WAS ACCOMPLISHED AND THERE WAS NO EVIDENCE OF ANY MECHANICAL FAILURES OR MALFUNCTIONS.

Flight

Event TypeAccident
Event Time12:30 MDT
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo

Aircraft

AircraftAerospatiale SA-315B
Tail NumberN29907
Aircraft CategoryHeli
DamageSubstantial
Operating RulePart 91
Engines1
Engine TypeTurboshaft
Engine DetailsTurbomeca · ARTOUSTE 3 B · Turboshaft · 562
Seats5

People & Injuries

Injury SummaryNo injuries (3 uninjured)
Fatal0
Serious0
Minor0
Uninjured3
Total3
Crew 1Age 36 · Second Class

Conditions

ConditionsVMC
LightDaylight
Wind270° @ 20 kt, gusting 25 kt
Visibility30 sm
CeilingNone
Temperature / Dew Point61 F / 0 C
Altimeter0
Weather SourcePILO

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Appendix: Source Data