# NTSB FTW87FA208: Cessna 208, N807LA, Bulverde, TX, September 5, 1987

- Type: NTSB accident investigation
- Classification: Accident · Minor injuries · Field investigation · Final report
- Date: September 4, 1987, 22:45 local (Sep 5, 1987, 03:45 UTC)
- Place: Bulverde, TX
- Coordinates: 29.769725, -98.449142 (estimated)
- Nearby events: https://openairdocs.org/map.md?lat=29.7697&lon=-98.4491&mi=10
- Phase of flight: [Enroute](https://openairdocs.org/ntsb-phases/400) (OpenAirDocs' grouping)
- Highest injury: Minor injuries
- Injuries: 1 minor
- Status: Completed, report January 25, 1989
- Report: Approved by Office Director
- NTSB case key (mKey): 22273
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=FTW87FA208
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/22273/pdf
- Page: https://openairdocs.org/ntsb/FTW87FA208

## Sequence of events

In NTSB's coding before 2008 (https://www.ntsb.gov/GILS/Documents/codman.pdf).

- Airframe/component/system failure/malfunction, cruise - normal
  - lubricating system,oil scavenge pump - loose (cause)
  - lubricating system,oil scavenge pump - jammed (cause)
  - lubricating system,oil scavenge pump - failure,total (cause)
  - initiated
- Loss of engine power(total) - mech failure/malf, cruise
  - fluid,oil - starvation (cause)
- Forced landing, descent - emergency
- In flight collision with object, landing
  - light condition - night (contributing factor)
  - object - wire,transmission (contributing factor)
  - object - tree(s) (contributing factor)
- In flight collision with terrain/water, descent - uncontrolled

## Analysis

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.

## Aircraft

- Registration: [N807LA](https://openairdocs.org/deregistered/N807LA-2013-08-08), registration cancelled 2013-08-08, S/N 20800026 (OpenAirDocs)
- Reported make and model: CESSNA 208
- Registry model: [Cessna 208](https://openairdocs.org/model/cessna-208) (registry code 2073702) (OpenAirDocs)
- Category: Airplane
- Serial number: 208A20800026
- Airframe hours: 222
- Engines: P&W PT6A-114 632 horsepower turbo prop
- Damage: Substantial damage
- Flight: Part 135
- Operator: Martinair
- Registered owner: Martinair Inc.
- Airworthiness certificate: Standard, Normal
- Last inspection: AAIP, August 17, 1987, 47 hours before
- Departed: SAT, SAN ANTONIO, TX
- Destination: DAL, DALLAS, TX

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; airline transport, flight instructor; airplane ratings: single-engine land, multi-engine land; instrument ratings: airplane; medical: class 2, valid medical--w/ waivers/lim; seat: left; flight hours: 3,100 total, 750 in this make and model, 2,850 as pilot in command, 250 in the last 90 days, 3 in the last 24 hours

## Weather

- Conditions: Visual (VMC), Night/bright
- Wind: 130° at 5 knots
- Visibility: 10 statute miles
- Lowest ceiling: none
- Temperature: 82 °F, dew point 59 °F
- Altimeter: 29.00 inHg
- Observed at: SAT, 15 nm away

## FAA reports on this event (1)

The FAA's own accident and incident reports, matched to the aircraft by N-number and date (OpenAirDocs).

- [Accident 19870904050319A](https://openairdocs.org/incident/19870904050319A), Sep 4, 1987: Cessna 208A, Bulverde, TX, Substantial damage. Lost oil pressure on climbout. Prop feathered. Tang washer broke. Oil pump shaft. Hit power line near 11XS. Crashed

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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