Accident
Last updated: 24 May 2013
| Statuts: | Enquête Officielle |
| Date: | 19 DEC 1984 |
| Heure: | 11:08 |
| Type/Sous-type: | de Havilland Canada DHC-3T Otter |
| Compagnie: | Cox Aircraft Corp. |
| Immatriculation: | N4247A |
| Numéro de série: | 421 |
| Année de Fabrication: | 1964 |
| Heures de vol: | 7445 |
| Moteurs: | 1 Pratt & Whitney Canada PT6A-135 |
| Equipage: | victimes: 0 / à bord: 1 |
| Passagers: | victimes: 0 / à bord: 2 |
| Total: | victimes: 0 / à bord: 3 |
| Dégats de l'appareil: | Substantiels |
| Conséquences: | Written off (damaged beyond repair) |
| Lieu de l'accident: | West Seattle, WA (Etats-Unis d'Amérique) |
| Phase de vol: | En vol (ENR) |
| Nature: | Test |
| Aéroport de départ: | Seattle-Boeing Field International Airport, WA (BFI/KBFI), Etats-Unis d'Amérique |
| Seattle-Boeing Field International Airport, WA (BFI/KBFI), Etats-Unis d'Amérique |
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 Sources:
» NTSB
Photos
Plan
Ce plan montre l'aéroport de départ ainsi que la supposé destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre Seattle-Boeing Field International Airport, WA et Seattle-Boeing Field International Airport, WA est de 0 km (0 miles).
La distance entre Seattle-Boeing Field International Airport, WA et Seattle-Boeing Field International Airport, WA est de 0 km (0 miles).
Les informations ci-dessus ne représentent pas l'opinion de la 'Flight Safety Foundation' ou de 'Aviation Safety Network' sur les causes de l'accident. Ces informations prélimimaires sont basées sur les faits tels qui sont connus à ce jour.
