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NTSB Report
July 21, 1989 · Texas Helicopter OH-13E/M74 · N47345
Greenwood, MS
Overview
Report Status
Probable Cause
Event Type
Accident
Date
July 21, 1989
Injury Outcomes
No injuries (1 uninjured)
Location
Greenwood, MS
Aircraft
Texas Helicopter OH-13E/M74
Tail Number
N47345
Operator
Valley Air
Injuries
None
Aircraft Damage
Substantial
NTSB Number
MIA89LA204
DURING CRUISE FLT, THE HELICOPTER WENT OUT OF CONTROL & BEGAN AN UNCOMMANDED DESCENT. THE CYCLIC & COLLECTIVE CONTROLS WERE NON-RESPONSIVE, BUT LEFT PEDAL WAS APPLIED BEFORE THE HELICOPTER CRASHED & IT CRASHED IN A TAIL LOW ATTITUDE. AN EXAM OF THE FLT CONTROLS REVEALED THAT ONE MAIN ROTOR BLADE PITCH CHANGE HORN HAD FAILED, AS WELL AS THE ATTACHING BOLTSFOR BOTH PITCH CHANGE HORNS. THERE WAS EVIDENCE THAT ONE OF THE BOLTS HAD FAILED, THEN THE OTHER FAILURES WERE FROM OVERLOAD.
NTSB Probable Cause
FAILURE OF A MAIN ROTOR BLADE PITCH CHANGE HORN AND/OR ATTACHING BOLT(S).
Full Narrative
DURING CRUISE FLT, THE HELICOPTER WENT OUT OF CONTROL & BEGAN AN UNCOMMANDED DESCENT. THE CYCLIC & COLLECTIVE CONTROLS WERE NON-RESPONSIVE, BUT LEFT PEDAL WAS APPLIED BEFORE THE HELICOPTER CRASHED & IT CRASHED IN A TAIL LOW ATTITUDE. AN EXAM OF THE FLT CONTROLS REVEALED THAT ONE MAIN ROTOR BLADE PITCH CHANGE HORN HAD FAILED, AS WELL AS THE ATTACHING BOLTSFOR BOTH PITCH CHANGE HORNS. THERE WAS EVIDENCE THAT ONE OF THE BOLTS HAD FAILED, THEN THE OTHER FAILURES WERE FROM OVERLOAD.
Flight
Event TypeAccident
Event Time12:40 CDT
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftTexas Helicopter OH-13E/M74
Tail NumberN47345
Aircraft CategoryHeli
DamageSubstantial
OperatorValley Air
Operating RulePart 91
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · VO-435-AIF · Reciprocating · 260
Seats1
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 42 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind200° @ 5 kt
Visibility5 sm
CeilingOvercast 1500 ft
Temperature / Dew Point66 F
Altimeter29.00 inHg
Observation Time16:51
Weather SourceWFAC