Friday, 15th of December, 1989

– United States of America

KLM Royal Dutch Airlines flight 867, an international scheduled passenger flight from Amsterdam-Schiphol International Airport (AMS/EHAM), Netherlands, to Narita International Airport, Tokyo, Japan, with a stopover at Anchorage International Airport (ANC/PANC), Alaska, USA, operated with a Boeing 747-406M, registration PH-BFC, encountered a volcanic ash cloud (the result of an eruption of Mount Redoubt the day before) and was forced to land at Anchorage due to the 4 engines failing.

The aircraft sustained substantial damage. The fourteen crew and 231 passengers were not injured. (245 survivors)

– Details:

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.

– 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.”

– Report:

https://app.ntsb.gov/pdfgener…/ReportGeneratorFile.ashx…