Accident
Last updated: 19 June 2013
| Status: | Schlussbericht |
| Datum: | 19 DEZ 1984 |
| Zeit: | 11:08 |
| Flugzeugtyp: | de Havilland Canada DHC-3T Otter |
| Fluggesellschaft: | Cox Aircraft Corp. |
| Kennzeichen: | N4247A |
| Werknummer: | 421 |
| Baujahr: | 1964 |
| Betriebsstunden: | 7445 |
| Triebwerk: | 1 Pratt & Whitney Canada PT6A-135 |
| Besatzung: | Todesopfer: 0 / Insassen: 1 |
| Fluggäste: | Todesopfer: 0 / Insassen: 2 |
| Gesamt: | Todesopfer: 0 / Insassen: 3 |
| Sachschaden: | schwer beschädigt |
| Konsequenzen: | Written off (damaged beyond repair) |
| Unfallort: | West Seattle, WA (USA) |
| Flugphase: | Während des Fluges (ENR) |
| Betriebsart: | Test |
| Flug von: | Seattle-Boeing Field International Airport, WA (BFI/KBFI), USA |
| Seattle-Boeing Field International Airport, WA (BFI/KBFI), USA |
The re-engined turboprop Otter was performing a test flight maneuvers when problems with the modified fuel system occurred. Ice blocking a fuel vent line caused a partial collapse of the main (engine feed) fuel cell which produced an errouneous fuel quantity reading. In addition, the main tank overflow shutoff valve was leaking, so tank overflow occurred. The fuel overflow caution light illuminated and auxiliary tank fuel pump feed to main automatically shut down. Due to miscalibration, this system overrode pilot attempts to restart aux fuel pumps. The pilot remained in test area troubleshooting rather than an immediate return to base. He finally noted main tank gauge continued to read 'full.' En route to Boeing Field, fuel starvation occurred. He attempted a forced landing in a small athletic field in a residential area rather than ditch in Puget Sound. The aircraft touched down, then bounced across an adjacent street. The arresting action of telephone wires on the vertical fin brought the aircraft to rest in a residential backyard.
PROBABLE CAUSE:
fuel system,vent..blocked(total)
fluid,fuel..starvation
CONTRIBUTING FACTORS:
precautionary landing..delayed..pilot in command
terrain condition..none suitable
fuel supply..misjudged..pilot in command
fuel system,tank..distorted
engine instruments,fuel quantity gage..false indication
fuel system,fuel shutoff..leak Informationsquelle:
» NTSB
Fotos
Map
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Seattle-Boeing Field International Airport, WA to Seattle-Boeing Field International Airport, WA as the crow flies is 0 km (0 miles).
Distance from Seattle-Boeing Field International Airport, WA to Seattle-Boeing Field International Airport, WA as the crow flies is 0 km (0 miles).
This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
