An editor has nominated this article for deletion. You are welcome to participate in the deletion discussion, which will decide whether or not to retain it. |
Alaska Airlines Flight 779 was a charter cargo flight that crashed on approach to Shemya Air Force Base.[1][2]
.jpg) A Douglas DC-6, the aircraft type involved in the accident | |
| Accident | |
|---|---|
| Date | July 21, 1961 |
| Summary | Crashed short of runway |
| Site | Shemya, Aleutian Islands, Alaska, United States |
| Aircraft | |
| Aircraft type | Douglas DC-6 |
| Operator | Alaska Airlines |
| Registration | N6118C |
| Flight origin | Paine Field, Everett, Washington |
| 1st stopover | Travis Air Force Base |
| 2nd stopover | Ted Stevens Anchorage International Airport |
| 3rd stopover | Shemya Air Force Base |
| Destination | Tachikawa Airfield |
| Crew | 6 |
| Fatalities | 6 |
Accident
The DC-6 was chartered by the Military Air Transport Service to carry cargo from Travis Air Force Base to Tachikawa, Japan with refueling stopovers in Anchorage and Shemya. On July 20, the flight departed Everett without cargo en route to Travis Air Force Base. Upon arrival in Travis military personnel loaded 25,999 pounds (11,793 kg) of cargo onto the aircraft under the supervision of the flight engineer.[3] The flight then departed Travis en route to Alaska, for the purpose of refueling and picking up the navigator from Anchorage. It took 8 hours and 59 minutes for the flight to arrive at Anchorage from Travis. The aircraft was at Anchorage Airport for an hour and 8 minutes. The time from takeoff in Anchorage to the crash was 6 hours and 30 minutes. In Anchorage, the crew was given weather information for the route to Shemya but were not notified of the approach and field lighting deficiencies.[3]
Flight 779 took off from Anchorage at 19:40 en route to Sheyma on an instrument flight plan. At 00:45 the flight radioed Sheyma air traffic control; reporting their position as 55° 46' North and 179° 08' East at an altitude of 10,000 feet. The flight was 100 miles from Sheyma 43 minutes later. At 01:45 the flight made radar contact with the airport, at an altitude of 5,500 feet and 18 miles north-northeast of the destination. The air traffic controller reported that the flight entered the glidepath and stayed on the correct approach for runway 10, but two miles from touchdown the flight was 10–15 feet below the ideal glidepath, so he instructed the crew to ""ease the aircraft up"; but the crew failed to correct the position. One mile from touchdown the aircraft was 30–40 feet below the glidepath, to which the controller again instructed the flight crew to "bring the aircraft up." Despite the warnings the flight still maintained the current path with no corrections to the altitude. The flight was still above the minimum safe altitude, and when the flight began to descend rapidly the controller assumed that the pilots switched to a visual approach.[3][4] At 02:11 Alaska time the flight crashed 200 feet short of the runway in Sheyma, killing all six crew members on board.[5]
Wind of speeds at 20 knots were present at an altitude of approximately 500 feet. At 02:12, when the observer of the U. S. Weather Bureau was notified, the weather conditions as follows were recorded:
"Indefinite 200-foot variable ceiling; visibility 3/4 mile variable, fog; temperature 45°; dewpoint 45°, wind south-southeast 8 knots; altimeter setting 29.84; ceiling 100 feet variable to 300 feet, visibility 1/2 mile variable to one mile."[4]
Aircraft
The aircraft involved in the accident was a Douglas DC-6A equipped with four Pratt & Whitney R2800 CB 17 engines. The aircraft was registered N6118C to Alaska Airlines and had a total of 10,600 flight hours.[6]
Crew
All six people aboard the aircraft were crew members.[7]
Investigation
The investigation revealed that the aircraft was in full working order when it crashed, in line with federal regulations and company procedures. All four engines when running when it crashed. Fuel management logs and main tank gauges showed that there was adequate supply of fuel to the engines prior to the crash. Control surfaces and aircraft structures were shown to be functional prior to the crash with no evidence of mechanical malfunction.[8]
Causes
The investigation revealed that the approach lights for the runway were not lit on the night of the crash. The pilot could not have know that only one strobe light was lit because the air traffic controller failed to adequately inform of the status of the runway lights.[9][10] The landing would be illegal under current FAA regulations, but was not at the time.[11]
References
- ^ Ranter, Harro. "ASN Aircraft accident Douglas DC-6A N6118C Shemya AFB, AK (SYA)". aviation-safety.net. Retrieved 2017-04-17.
- ^ "Shemya Island, AK Cargo Plane Crashes, July 1961 | GenDisasters ... Genealogy in Tragedy, Disasters, Fires, Floods". www.gendisasters.com. Retrieved 2017-04-23.
- ^ a b c CAB Final report, p. 2
- ^ a b CAB Final report, p. 3
- ^ CAB Final report, p. 1
- ^ CAB Final report, p. 10
- ^ CAB Final report, p. 6
- ^ CAB Final report, p. 7
- ^ CAB Final report, p. 8
- ^ CAB Final report, p. 9
- ^ "Advisory Circulars – Airport Lighting". www.faa.gov. Retrieved 2017-04-23.
"Aircraft Accident Report. Alaska Airlines, Inc., Douglas DC-6A, N 6118C. Shemya, Alaska. July 21, 1961.". Civil Aeronautics Board. 1962-10-10.