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Last updated: 18 October 2019
Status:Definitief
Datum:zaterdag 29 november 2003
Tijd:08:01
Type:Silhouette image of generic SW4 model; specific model in this crash may look slightly different
Swearingen SA227-AT Merlin IVC
Luchtvaartmaatschappij:Ameriflight
Registratie: N439AF
Constructienummer: AT-439B
Bouwjaar: 1981
Aantal vlieguren:15126
Motoren: 2 Garrett TPE331-11U-611G
Bemanning:slachtoffers: 1 / inzittenden: 1
Passagiers:slachtoffers: 0 / inzittenden: 0
Totaal:slachtoffers: 1 / inzittenden: 1
Schade: Vernield
Gevolgen: Written off (damaged beyond repair)
Plaats:5,5 km (3.4 mijl) E of Spokane-Felts Field, WA (SFF) (   Verenigde Staten)
Fase: Nadering (APR)
Soort vlucht:Vracht
Vliegveld van vertrek:Seattle-Boeing Field International Airport, WA (BFI/KBFI), Verenigde Staten
Vliegveld van aankomst:Spokane-Felts Field, WA (SFF/KSFF), Verenigde Staten
Vluchtnummer:1966
Beschrijving:
The Merlin cargo plane was transporting 127 packages from Seattle to Spokane. The aircraft was dispatched with the primary (NAV 1) ILS receiver having been deferred (out of service) due to unreliable performance the evening before the accident, thus leaving the aircraft with the secondary (NAV 2) ILS receiver for ILS use. Approaching Spokane, the pilot was cleared for an ILS/DME runway 21R approach. Weather at the destination airport was poor with a 400 foot overcast. The pilot was given a low altitude alert by the tower and acknowledged, reporting that he was descending through 2,800 feet. At that point the aircraft was well below the ILS glideslope and about 13 seconds from impacting the trees. The pilot was given a low altitude alert by the tower and acknowledged, reporting that he was descending through 2,800 feet, which was confirmed on the mode C radar readout. At that point the aircraft was well below the ILS glideslope and about 13 seconds from impacting the trees.

Probable Cause:

PROBABLE CAUSE: "The pilot-in-command's failure to maintain proper glidepath alignment during an ILS approach in poor weather resulting in collision with trees and terrain. Contributing factors were the unreliable status of the primary (NAV 1) ILS receiver (leaving the pilot with only the secondary (NAV 2) ILS receiver), the low ceilings and trees."

Accident investigation:
cover
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year
Accident number: SEA04FA023
Download report: Summary report

Bronnen:
» NTSB


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Kaart
Deze kaart geeft het vliegveld van vetrek weer en de geplande bestemming van de vlucht. De lijn tussen de vliegvelden geeft niet de exacte vliegroute weer.
De afstand tussen Seattle-Boeing Field International Airport, WA en Spokane-Felts Field, WA bedraagt 371 km (232 miles).
Accident location: Exact; as reported in the official accident report.

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.
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