Status:	Definitief
Datum:	15 DEC 1989
Tijd:	11:48
Type:	Boeing 747-406
Luchtvaartmaatschappij:	KLM Royal Dutch Airlines
Registratie:	PH-BFC
Constructienummer:	23982/735
Bouwjaar:	1989-06-30 (6 months)
Aantal vlieguren:	7050
Motoren:	4 General Electric CF6-80C2B1F
Bemanning:	slachtoffers: 0 / inzittenden: 14
Passagiers:	slachtoffers: 0 / inzittenden: 231
Totaal:	slachtoffers: 0 / inzittenden: 245
Schade:	Groot
Gevolgen:	Repaired
Plaats:	nabij Anchorage, AK (Verenigde Staten)
Fase:	Kruisvlucht (ENR)
Soort vlucht:	Internationale lijnvlucht
Vliegveld van vertrek:	Amsterdam-Schiphol International Airport (AMS/EHAM), Nederland
Vliegveld van aankomst:	Anchorage International Airport, AK (ANC/PANC), Verenigde Staten
Vluchtnummer:	867

Beschrijving:
At FL250 the aircraft flew into a normal looking cloud, which turned out to be a volcanic ash cloud (the result of an eruption of Mount Redoubt). Power was added to climb out of the cloud. About 10-15 seconds later all 4 engines failed and the standby electrical system failed. The crew were able to restart the engines after numerous attempts. The no. 1 and 2 engines were relit while descending through FL130 and the remaining 2 engines were relit at FL110. The aircraft landed safely at Anchorage, substantially damaged by the in-flight blasting by volcanic ash. The windshields were damaged, as were internal aircraft systems, avionics and electronics.

PROBABLE CAUSE: "Inadvertent encounter with volcanic ash cloud, which resulted in damage from foreign material (foreign object) and subsequent compressor stalling of all engines. A factor related to the accident was: the lack of available information about the ash cloud to all personnel involved."

Bronnen:
» NTSB