KLM Flight 867

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KLM Flight 867
The Crew of KL 867 inspecting the damage of their Boeing 747-406M (Registration PH-BFC) which encountered the ash cloud from Mt Redoubt in Alaska in December 1989.jpeg
The cockpit crew inspects the damage caused to PH-BFC by the ash cloud in Anchorage the day after the incident.
Incident
Date15 December 1989 (1989-12-15)
SummaryQuadruple engine failure due to blockage by volcanic ash
SiteOver Redoubt Volcano, Anchorage, Alaska
Aircraft
PH-BFC KLM Royal Dutch Airlines Boeing 747-406(M) taxiing at Schiphol (AMS - EHAM), The Netherlands, 18may2014, pic-6.JPG
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 signKLM 867
Registration PH-BFC
Flight origin Amsterdam Airport Schiphol, Amsterdam, Netherlands
Stopover Anchorage International Airport, Anchorage, Alaska, United States
Destination Anchorage International Airport, Anchorage, Alaska, United States
Occupants245
Passengers231
Crew14
Fatalities0
Injuries0
Survivors245

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.

Contents

Aircraft

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 on September, 1989. The 747 was equipped with four General Electric CF6-80C2B1F engines. [3] [4]

Engine failure

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 ]

Transcript

The following edited transmissions took place between Anchorage Center, the air traffic control facility for that region, and KLM 867: [6]

Pilot: KLM 867 heavy is reaching level 250 heading 140
Anchorage Center: Okay, Do you have good sight on the ash plume at this time?
Pilot: Yea, it's just cloudy it could be ashes. It's just a little browner than the normal cloud.
Pilot: We have to go left now: it's smoky in the cockpit at the moment, sir.
Anchorage Center: KLM 867 heavy, roger, left at your discretion.
Pilot: Climbing to level 390, we're in a black cloud, heading 130.
Pilot: KLM 867 we have flame out all engines and we are descending now!
Anchorage Center: KLM 867 heavy, Anchorage?
Pilot: KLM 867 heavy, we are descending now: we are in a fall!
Pilot: KLM 867, we need all the assistance you have, sir. Give us radar vectors please!

Recovery and aftermath

PH-BFC (94).jpg
The incident aircraft at Schiphol Airport in 1994.

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]

See also

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References

  1. "Airfleets summary for Boeing 747 MSN 23982". Airfleets.net. 30 June 1989. Retrieved 22 April 2016.
  2. 1 2 Witkin, Richard (16 December 1989). "Jet Lands Safely After Engines Stop in Flight Through Volcanic Ash". New York Times . Retrieved 2 February 2009.
  3. "Please refresh this page | Planespotters.net". www.planespotters.net. Retrieved 13 March 2024.
  4. "ASN Aircraft accident Boeing 747-406M PH-BFC Anchorage, AK". aviation-safety.net. Retrieved 13 March 2024.
  5. ""A look back at Alaska volcano's near-downing of a 747"". Heraldnet.com. 18 April 2010. Archived from the original on 3 March 2016. Retrieved 22 April 2016.
  6. "VOLCANIC HAZARDS—IMPACTS ON AVIATION" United States Senate Committee on Commerce, Science, and Transportation hearing in 2006
  7. Neal, Christina; Casadevall, Thomas J.; Miller, Thomas P.; Hendley II, James W.; Stauffer, Peter H. (1997). "Volcanic Ash–Danger to Aircraft in the North Pacific" (PDF). U.S. Geological Survey Fact Sheet 030-97. United States Geological Survey . Retrieved 2 February 2009.
  8. Mauer, Richard (14 January 1990). "Government looks into animals mishap". Anchorage Daily News.
  9. "Deze mega Boeing zien we nooit meer terug". Telegraaf. 14 March 2018. Retrieved 14 March 2018.
  10. "PH-BFC pictures on". Airliners.net. 23 April 2016. Retrieved 13 May 2016.
  11. "PH-BFC KLM Royal Dutch Airlines Boeing 747-400M". www.planespotters.net. Retrieved 11 March 2024.

61°10′18″N149°59′12″W / 61.1717°N 149.9867°W / 61.1717; -149.9867