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NTSB Report
September 5, 1987 · Cessna 208 · N807LA
Bulverde, TX
Overview
Report Status
Preliminary report
Event Type
Accident
Date
September 5, 1987
Injury Outcomes
1 injury (1 minor injury)
Location
Bulverde, TX
Aircraft
Cessna 208
Tail Number
N807LA
Operator
Martinair
Injuries
Minor
Aircraft Damage
Substantial
NTSB Number
FTW87FA208
AFTER LEVELING AT 5500', THE STANDBY POWER ANNUNCIATOR LIGHT ILLUMINATED, FOLLOWED BY LOSS OF OIL PRESSURE. THE PLT TURNED BACK TOWARD THE ARPT, BUT THERE WAS A PROGRESSIVE LOSS OF ENG POWER & THE PROP WENT TO A FEATHERED PSN. DRG AN EMERG LANDING AT NIGHT, THE ACFT HIT A POWER LINE & TREES, THEN CRASHED. DRG AN ENG TEARDOWN, DISASSEMBLY OF THE REDUCTION GEARBOX SCAVENGE PUMP REVEALED THAT A RETAINING NUT & TANG WASHER (W/I THE SCAVENGE PUMP) HAD BACKED OFF & LODGED BTN THE SPUR GEARS, WHICH RESULTED IN A SHEARED SCAVENGE PUMP DRIVE SHAFT. IN TURN, THIS RESULTED IN THE LOSS OF OIL PRESSURE & ALLOWED THE PROP TO FEATHER.
Full Narrative
AFTER LEVELING AT 5500', THE STANDBY POWER ANNUNCIATOR LIGHT ILLUMINATED, FOLLOWED BY LOSS OF OIL PRESSURE. THE PLT TURNED BACK TOWARD THE ARPT, BUT THERE WAS A PROGRESSIVE LOSS OF ENG POWER & THE PROP WENT TO A FEATHERED PSN. DRG AN EMERG LANDING AT NIGHT, THE ACFT HIT A POWER LINE & TREES, THEN CRASHED. DRG AN ENG TEARDOWN, DISASSEMBLY OF THE REDUCTION GEARBOX SCAVENGE PUMP REVEALED THAT A RETAINING NUT & TANG WASHER (W/I THE SCAVENGE PUMP) HAD BACKED OFF & LODGED BTN THE SPUR GEARS, WHICH RESULTED IN A SHEARED SCAVENGE PUMP DRIVE SHAFT. IN TURN, THIS RESULTED IN THE LOSS OF OIL PRESSURE & ALLOWED THE PROP TO FEATHER.
Flight
Event TypeAccident
Event Time22:45 CDT
Nearest Airport0nm N
Runway0
Runway Length0
Runway Width0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftCessna 208
Tail NumberN807LA
Aircraft CategoryAir
DamageSubstantial
OperatorMartinair
Operating RulePart 135
Engines1
Engine TypeTurboprop
Engine DetailsP&W · PT6A-114 · Turboprop · 632
Seats2
People & Injuries
Injury Summary1 injury (1 minor injury)
Fatal0
Serious0
Minor1
Uninjured0
Total1
Crew 1Second Class
Conditions
ConditionsVMC
LightBright Night
Wind130° @ 5 kt
Visibility10 sm
CeilingNone
Temperature / Dew Point59
Altimeter29.00 inHg
Observation Time21:55
Weather SourceWFAC