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NTSB Report
July 30, 1993 · Continental Copters Tomcat MK5A Tomcat MK5 · N9014T
Duson, LA
Overview
Report Status
Probable Cause
Event Type
Accident
Date
July 30, 1993
Injury Outcomes
No injuries (1 uninjured)
Location
Duson, LA
Aircraft
Continental Copters Tomcat MK5A Tomcat MK5
Tail Number
N9014T
Operator
Penn-Tex Helicopters
Injuries
None
Aircraft Damage
Substantial
NTSB Number
DEN93LA091
WHILE ENGAGED IN AN AERIAL APPLICATION OPERATION, THE PILOT HEARD BANGING NOISES AND THE ENGINE BEGAN TO OVERSPEED. ALTHOUGH COLLECTIVE CONTROL WAS INEFFECTIVE, THE PILOT WAS ABLE TO MANEUVER THE HELICOPTER TO A HARD LANDING USING THROTTLE AND PARTIAL CYCLIC CONTROL. POST ACCIDENT INVESTIGATION DISCLOSED THE TRANSMISSION MAST BEARING HAD FAILED, CONTAMINATING THE OIL WITH STEEL PARTICLES THAT OBSTRUCTED THE INTERNAL OIL PASSAGES.
NTSB Probable Cause
FAILURE OF THE TRANSMISSION MAST BEARING, RESULTING IN OIL CONTAMINATION AND SUBSEQUENT BLOCKAGE OF THE INTERNAL OIL PORTS AND PASSAGES. FACTORS WERE: TOTAL LOSS OF COLLECTIVE CONTROL AND PARTIAL LOSS OF CYCLIC CONTROL.
Full Narrative
WHILE ENGAGED IN AN AERIAL APPLICATION OPERATION, THE PILOT HEARD BANGING NOISES AND THE ENGINE BEGAN TO OVERSPEED. ALTHOUGH COLLECTIVE CONTROL WAS INEFFECTIVE, THE PILOT WAS ABLE TO MANEUVER THE HELICOPTER TO A HARD LANDING USING THROTTLE AND PARTIAL CYCLIC CONTROL. POST ACCIDENT INVESTIGATION DISCLOSED THE TRANSMISSION MAST BEARING HAD FAILED, CONTAMINATING THE OIL WITH STEEL PARTICLES THAT OBSTRUCTED THE INTERNAL OIL PASSAGES.
Flight
Event TypeAccident
Event Time09:30 CDT
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftContinental Copters Tomcat MK5A Tomcat MK5
Tail NumberN9014T
Aircraft CategoryHeli
DamageSubstantial
OperatorPenn-Tex Helicopters
Operating RulePart 137
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · VO-435-A1F · Reciprocating · 260
Seats1
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 39 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind20° @ 6 kt
Visibility7 sm
CeilingOvercast 25000 ft
Altimeter30.00 inHg
Weather SourceWIT