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NTSB Report
January 22, 1993 · Grumman G-164A · N6654
Lost Hills, CA
Overview
Report Status
Probable Cause
Event Type
Accident
Date
January 22, 1993
Injury Outcomes
No injuries (1 uninjured)
Location
Lost Hills, CA
Aircraft
Grumman G-164A
Tail Number
N6654
Operator
San Joaquin Helicopters
Injuries
None
Aircraft Damage
Substantial
NTSB Number
LAX93LA098
THE PILOT SAID THAT AFTER TOUCHDOWN HE APPLIED SOME LEFT BRAKE PEDAL TO AID IN MAINTAINING DIRECTIONAL CONTROL AS THE AIRCRAFT SLOWED. THE PILOT STATED THAT WHEN HE RELEASED THE BRAKE PRESSURE THE LEFT BRAKE PEDAL REMAINED DEPRESSED WITH THAT BRAKE STILL ACTIVATED. THE PILOT SAID HE WAS ABLE TO MAINTAIN SOME DIRECTIONAL CONTROL BY USING RIGHT BRAKE PRESSURE AND RUDDER; HOWEVER, AS THE AIRCRAFT SLOWED, THE CORRECTIVE ACTIONS BECAME LESS AND LESS EFFECTIVE AND THE AIRCRAFT EVENTUALLY RAN OFF THE LEFT SIDE OF THE RUNWAY AND GROUND LOOPED. THE OPERATOR REPORTED THAT A POST ACCIDENT EXAMINATION REVEALED THAT THE LEFT BRAKE MASTER CYLINDER HAD MALFUNCTIONED AND WOULD BIND WHEN THE PEDAL WAS DEPRESSED.
NTSB Probable Cause
THE PILOT'S INABILITY TO MAINTAIN DIRECTIONAL CONTROL DURING THE LANDING ROLL OUT DUE TO A BINDING LEFT BRAKE MASTER CYLINDER.
Full Narrative
THE PILOT SAID THAT AFTER TOUCHDOWN HE APPLIED SOME LEFT BRAKE PEDAL TO AID IN MAINTAINING DIRECTIONAL CONTROL AS THE AIRCRAFT SLOWED. THE PILOT STATED THAT WHEN HE RELEASED THE BRAKE PRESSURE THE LEFT BRAKE PEDAL REMAINED DEPRESSED WITH THAT BRAKE STILL ACTIVATED. THE PILOT SAID HE WAS ABLE TO MAINTAIN SOME DIRECTIONAL CONTROL BY USING RIGHT BRAKE PRESSURE AND RUDDER; HOWEVER, AS THE AIRCRAFT SLOWED, THE CORRECTIVE ACTIONS BECAME LESS AND LESS EFFECTIVE AND THE AIRCRAFT EVENTUALLY RAN OFF THE LEFT SIDE OF THE RUNWAY AND GROUND LOOPED. THE OPERATOR REPORTED THAT A POST ACCIDENT EXAMINATION REVEALED THAT THE LEFT BRAKE MASTER CYLINDER HAD MALFUNCTIONED AND WOULD BIND WHEN THE PEDAL WAS DEPRESSED.
Flight
Event TypeAccident
Event Time16:00 PST
Nearest AirportBlackwell Land Company (0nm N)
Runway28
Runway Length4200 ft
Runway Width30 ft
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftGrumman G-164A
Tail NumberN6654
Aircraft CategoryAir
DamageSubstantial
OperatorSan Joaquin Helicopters
Operating RulePart 137
Engines1
Engine TypeReciprocating
Engine DetailsP&W · R-1340 · Reciprocating · 600
Seats1
People & Injuries
Injury SummaryNo injuries (1 uninjured)
Fatal0
Serious0
Minor0
Uninjured1
Total1
Crew 1Age 41 · Second Class
Conditions
ConditionsVMC
LightDaylight
WindCalm
Visibility30 sm
CeilingNone
Temperature / Dew Point57 / 0 C
Altimeter0
Weather SourcePILO