Incident | |
---|---|
Date | 15 December 1989 |
Summary | Quadruple engine failure due to blockage by volcanic ash |
Site | Over Redoubt Volcano, Anchorage, Alaska |
Aircraft | |
PH-BFC, the aircraft involved in the incident, seen in 2014. | |
Aircraft type | Boeing 747-406M |
Aircraft name | City of Calgary |
Operator | KLM |
IATA flight No. | KL867 |
ICAO flight No. | KLM867 |
Call sign | KLM 867 |
Registration | PH-BFC |
Flight origin | Amsterdam Airport Schiphol, Amsterdam, Netherlands |
Stopover | Anchorage Airport, Alaska, USA |
Destination | Narita International Airport, Tokyo, Japan |
Occupants | 245 |
Passengers | 231 |
Crew | 14 |
Fatalities | 0 |
Injuries | 0 |
Survivors | 245 |
On 15 December 1989, KLM Flight 867, en route from Amsterdam to Narita International Airport, Tokyo, was forced to make an emergency landing at Anchorage International Airport, Alaska, when all four engines failed. The Boeing 747-406M, less than six months old at the time, [1] flew through a thick cloud of volcanic ash from Mount Redoubt, [2] which had erupted the day before.
The aircraft involved was a Boeing 747-406M, serial number 23982, and registered as PH-BFC. The aircraft had its maiden flight on 30 June 1989. It was, at the time of the incident, almost 6 months old and was delivered to KLM in September 1989. The 747 was equipped with four General Electric CF6-80C2B1F engines. [3] [4]
All four engines failed, leaving only critical systems on backup electrical power. One report assigned the engine shutdown to the conversion of the ash into a glass coating inside the engines that fooled the engine temperature sensors and led to an auto-shutdown of all four engines. [5]
When all four main generators shut off due to the failure of all the engines, a momentary power interruption occurred when the flight instruments transferred to standby power. Standby power on the 747-400 is provided by two batteries and inverters. The captain performed the engine restart procedure, which failed on the first few attempts, and repeated it until restart was achieved. On some of the attempts, as one or more (but not all) engines started to operate, the main generator switched back on. This switching on and off caused repeated power transfer interruptions to the flight instruments. The temporary blanking of the instruments gave the appearance that standby power had failed. These power transfers were later verified from the flight data recorder.[ citation needed ]
The following edited transmissions took place between Anchorage Center, the air traffic control facility for that region, and KLM 867: [6]
After descending more than 14,000 ft (4250 m), the crew restarted the engines and safely landed the plane. In this case, the ash caused more than US$80 million in damage to the aircraft, requiring all four engines to be replaced, but there were no human deaths and no one was injured. [2] [7] A shipment of 25 African birds, two genets, and 25 tortoises aboard the plane was diverted to an Anchorage warehouse, where eight birds and three tortoises died before the mislabeled shipment was discovered. [8]
The aircraft, PH-BFC, remained in service with KLM until its retirement from the fleet on 14 March 2018. [9] It became part of the KLM Asia fleet in 1995 when the subsidiary was established to allow KLM to fly to both Taiwan and mainland China. PH-BFC was later repainted in the standard KLM livery after a maintenance check. [10] It was scrapped in January 2020 at Teruel Airport. [11]
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This is a list of aviation-related events from 1989.
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