Tag Archives: Controlled Flight Into Terrain

16 January 1942

Transcontinental and Western Air Douglas DC-3 NC1945, sistership of NC1946, TWA Flight 3. (TWA)
Transcontinental and Western Air, Inc., Douglas DC-3-362 NC1945, sistership of NC1946, TWA Flight 3. The airplane in this photograph is in the collection of the Airline History Museum, Kansas City, Missouri.(TWA)

16  January 1942: Transcontinental and Western Air, Inc., Flight 3, was a transcontinental passenger flight enroute to Los Angeles, California from New York City.

The airplane was a Douglas DC-3-362, registered NC1946.

The pilot in command was Captain Wayne C. Williams, an 11-year employee of T&WA. He had 12,204 hours total flight time with more than 3,500 hours in DC-3s. He had flown 204 hours at night within the previous six months. The co-pilot was S. Morgan Gillette, who had been with T&WA for a little less that 1 year, 6 months. He had 1,330 hours of flight time with 650 in DC-3s.

Transcontinental and Western Air, Inc., DC-3 NC1944. (Nelson Ronsheim)

After a refueling stop at Las Vegas Airport, the airliner departed at 7:07 p.m. Pacific Standard Time, on the final leg of the flight to the Lockheed Air Terminal at  Burbank, California (officially, the Bob Hope Airport, but now known Hollywood Burbank Airport). It was dark, but the weather was clear. Because of wartime regulations, the lighted airway beacons on the route had been extinguished.

At 7:20 p.m., PST, Flight 3 crashed into a vertical cliff face on Potosi Mountain, an 8,517-foot (2,596 meters) mountain 32 miles (51.5 kilometers) southwest of Las Vegas, Nevada. The DC-3 was completely destroyed and all 22 persons aboard were killed, including actress Carole Lombard, Mrs. Clark Gable.

In planning the flight, the crew had made an error in the compass course for this leg of the flight. Their written flight plan, filed with the airline’s operations department, indicated a compass course of 218° which took them directly to the mountain.

Carole Lombard (6 October 1908–16 January 1942)
Carole Lombard (Paramount Studios)

Carole Lombard (née Jane Alice Peters) was one of the most successful motion picture actresses in Hollywood. She was born at Fort Wayne, Indiana, in 1908, and had her first motion picture role in 1921. At age 16, she was under contract to the Fox Film Corporation and as was customary, was given a more dramatic name. She was primarily a comedic actress though she also had several dramatic roles.

Lombard was nominated for an Academy Award for Best Actress in “My Man Godfrey” which starred William Powell, to whom she was married 1931–1933. In 1938, Lombard married actor Clark Gable.

Carole Lombard had been on a War Bonds tour and was returning home to Hollywood. She was seated in an aisle seat in the third row, next to a U.S. Army private. Her mother, Elizabeth Peters, was seated directly across the aisle.

Transcontinental and Western Flight 3 crash site
Scene of the crash of Transcontinental and Western Flight 3 on Petosi Mountain, Nevada. The point of impact was at an elevation of 7,770 feet (2,368 meters). (Bettman Archive via Lost Flights)
Crash site, T&WA Flight 3 on Petosi Mountain, Nevada.
Rescue/recovery team at the crash site of T&WA Flight 3 on Petosi Mountain, Nevada, 18 January 1942. (Civil Aeronautics Authority, Bureau of Aviation Safety)
TWA Flight 3 crashed on this vertical face of Mount Potosi, Nevada, 16 January 1942, killing all on board. (Harlan Stockman)
TWA Flight 3 crashed on this vertical face of Potosi Mountain, Nevada, 16 January 1942, killing all on board. (Harlan Stockman)

NC1946 was a DC-3-362, c/n 3295, built in February 1941 for Transcontinental and Western Air by the Douglas Aircraft Company at Santa Monica, California. It was an all-metal, twin-engine civil transport with retractable landing gear. The airplane was operated by a pilot and co-pilot and could carry up to 21 passengers.

The DC-3-362 was 64 feet, 5 inches (19.634 meters) long with a wingspan of 95 feet (28.956 meters). It was 16 feet, 11 inches (5.156 meters) high. The airplane weighed approximately 18,000 pounds (8,165 kilograms) empty and had a gross weight of 25,200 pounds (11,431 kilograms).

NC1946 was powered by two air-cooled, supercharged 1,823.129-cubic-inch-displacement (29.875 liter) Wright Aeronautical Division Cyclone 9 GR-1820G202A nine-cylinder radial engines with compression ratio of 6.7:1. These engines had a Normal Power rating of 1,100 horsepower at 2,400 r.p.m., and 1,200 horsepower at 2,500 r.p.m. for Takeoff, burning 91/96 octane aviation gasoline. They drove three-bladed, constant-speed, full-feathering Hamilton Standard Hydromatic propellers through a 0.5625:1 gear reduction. The GR-1820G202A was 4 feet, 2.04 inches (1.271 meters) long, 4 feet, 7.10 inches (1.400 meters) in diameter, and weighed 1,310 pounds (594 kilograms).

The DC-3  had a cruise speed of 150 miles per hour (241 kilometers per hour) and maximum speed of 237 miles per hour (381 kilometers per hour) at 8,500 feet (2,591 meters). The airplane had a service ceiling 24,000 feet (7,315 meters), and its range was 1,025 miles (1,650 kilometers).

The Douglas DC-3 was in production for 11 years with 10,655 civil and C-47 military airplanes built, and another 5,000 license-built copies. Over 400 are still in commercial service.

Petosi Mountain, looking west. (Detail from photograph by Stan Shebs)
Petosi Mountain, looking west. (Detail from photograph by Stan Shebs)

© 2017, Bryan R. Swopes

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28 November 1979, 00:49:50 GMT

Air New Zealand McDonnell Douglas DC-10-30 ZK-NZP at London Heathrow Airport, July 1977. (Eduard Marmet via Wikipedia)
Air New Zealand McDonnell Douglas DC-10-30 ZK-NZP at London Heathrow Airport, July 1977. (Eduard Marmet via Wikipedia)

28 November 1979: An Air New Zealand sightseeing flight to Antarctica, Flight TE 901, departed Auckland Airport (AKL) on the North Island of New Zealand, at 1917 GMT, 27 November (8:17 a.m., 28 November, local time). The flight was planned to proceed to the vicinity of McMurdo Station at the south end of Ross Island, off the continent of Antarctica, and then return to Christchurch International Airport (CHC) on New Zealand’s South Island. The duration of the flight was estimated to be 11 hours and would travel a total of 5,360 miles (8,626 kilometers), all during daylight hours.

Air New Zealand had previously flown thirteen Antarctic excursions. On this date, the airliner operated as Flight TE 901 was a five year old McDonnell Douglas DC-10-30, registration ZK-NZP. On board the airliner were a flight crew of five, cabin crew of fifteen and 237 passengers.

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Collins

The pilot in command (PIC) was Captain Thomas James Collins. Captain Collins held an airline transport pilot license with a DC-10 type rating. He had flown a total of 11,151 flight hours, of which 2,872 had been aboard DC-10s. Because of the flight’s planned duration, the crew included two more pilots, First Officer Gregory Mark Cassin and First Officer Graham Neville Lucas. There were also two flight engineers, Flight Engineer Gordon Barrett Brooks and Flight Engineer Nicholas John Maloney. All were very experienced pilots, type-rated in the DC-10. None, however, had previously flown the Antarctic route.

19 days before the flight, Captain Collins and First Officer Cassin had received an audio-visual briefing of the planned flight. They also flew the route in a cockpit simulator. The route of previous flights had taken the airliners from the Ross Sea into McMurdo Sound, well west of Ross Island and its 12,448 foot (3,794 meters) active volcano, Mount Erebus. At a pre-determined waypoint, the airliner turned left toward McMurdo Station. The airline’s minimum altitude through this area was 16,000 feet (4,877 meters) until south of McMurdo Station, and then only if certain weather conditions were present.

Air New Zealand flight planners had discovered that data which had been entered into the aircraft’s Area Inertial Navigation System (AINS) computer was incorrect. The coordinates of the for the destination waypoint were  actually 2˚10′ west of the intended destination waypoint. The intended route was to take TE 901 directly over Mount Erebus to the emergency whiteout landing area near Williams Field (ICAO: NZWD) about 10 miles (16 kilometers) from McMurdo Station on the Ross Ice Shelf. Because of the data error, however, all previous flights had approached from well west of Ross Island before turning toward McMurdo Station at West Dailey Island. The navigation data was corrected, but the flight crew had not been informed of the change or the reason for it.

DC-10 navigation console. (Unattributed)
DC-10 navigation console. (Unattributed)

The flight toward Antarctica proceeded normally. Exactly five hours after takeoff, Captain Collins began a descent from TE 901’s cruising altitude. At this point the airliner was approximately 140 miles (225 kilometers) north of McMurdo Station. First Officer Cassin advised air traffic control, Mac Center, of their descent. The controller acknowledged and gave the current weather at McMurdo as “. . . low overcast in the area at about 2,000 feet [607 meters] and . . . some snow but our visibility is still about 40 miles [64 kilometers]. . . .” In the cockpit, Captain Collins commented that the clouds were lower than previously reported, and that, it would be, “Very hard to tell the difference between the cloud and the ice.”

First Officer Cassin requested descent to 16,000 feet (4,877 meters) but Mac Center directed the flight to “descend and maintain Flight Level 180.” (18,000 feet/5,486 meters)

Over the next six minutes, TE 901 traveled 50 miles as it descended to FL 180. Radio transmissions during the let down were unclear, with Mac Center, Flight 901 and Ice Tower all trying to make contact. It is possible that the high terrain between the airliner and McMurdo Station was blocking the signals. The pilots discussed using other frequencies. Captain Collins and Flight Engineer Brooks discussed the airliner’s present weight and the minimum speed required, which was calculated to be 252 knots.

Satellite image of Ross Island. McMurdo Station is at the tip of the narrow peninsula in the lower left quadrant. (NASA)
Satellite image of Ross Island. McMurdo Station is at the tip of the narrow peninsula in the lower left quadrant. (NASA)
rossislandmap
Topographic map of Ross Island, Antarctica (1:250,000 scale) (USGS)

 

 

At 00:24:44, the DC-10’s Altitude Alert sounded, indicating that the airplane had reached the assigned altitude of Flight Level 180.

At 00:31:01, Captain Collins told the crew, “I’ll have to do an orbit here I think.” Seven seconds later, he said, “Well actually it’s clear out here if we get down. . .and—” Someone in the cockpit replied, “It’s not clear on the right hand side here.” First Officer Cassin said, “No.”

Captain Collins had observed an opening in the clouds to the left of the airplane, and decided to descend further under visual conditions. He first began a descending 360˚ turn to the right, followed by  a descending 180˚to the left. This put the DC-10 on a course away from McMurdo Station at 10,000 feet (3,048 meters). Captain Collins and the two flight engineers discussed the desired airspeed. With the flight still continuing outbound, at 00:42:49, Collins said, “We’re VMC [Visual Meteorological Conditions] around this way so I’m going to do another turn in.” The flight’s expert commentator, Peter Mulgrew, had entered the flight deck. Captain Collins said, “Sorry haven’t got time to talk but—” Mulgrew replied, “Ah well you can’t talk if you can’t see anything.” However, Mulgrew remained in the cockpit.

At 00:45:00, First Officer Cassin called McMurdo Center and reported, “. . . we are now at six thousand descending to two thousand and we’re VMC.”

Mount Erebus, the world's southernmost active volcano, with a height of 2,448 foot (3,794 meters). (Tattered Passport)
The world’s most southern active volcano, Mount Erebus on Ross Island, Antarctica, has a height of 12,448 feet (3,794 meters). (Tattered Passport)

Passing through 3,000 feet (914 meters), Flight Engineer Brooks asked, “Where’s Erebus in relation to us at the moment?” Someone answered, “Left about twenty or twenty-five miles.” Someone else asked, “Left do you reckon?” A voice said, “Well I don’t know—I think.” An unknown voice said, “I’ve been looking for it.” Cassin replied, “Yep, yep.” Brooks then said, “I’m just thinking of any high ground in the area, that’s all.”

Mulgrew replied, “I think it’ll be left, yes.” The second flight engineer, Nick Maloney, then said, “Yes, I reckon about here.”  Mulgrew answered, “Yes—no, no, I don’t really know.” Then at 00:47:02, he said, “That’s the edge,” probably indicating that he could see the edge of the ice sheet ahead.

At 00:47:06, a crewmember announced, “Down to two thousand.” Both Collins and Cassin acknowledged this, “Yes.” — “Yes.” The crew then set the flight director to hold airspeed and altitude.

At 00:47:43, Captain Collins said, “We might have to pop down to fifteen hundred here I think.” Cassin replied, “Yes, OK. . . Probably see further in anyway. . . It’s not too bad. . . I see vert speed for fifteen hundred feet.”

Flight Engineer Maloney said, “—It’s not right.” An unknown voice then said, “Bit thick here eh Bert?” Maloney replied, “Yeah my. . . . oath. . . (pause) You’re really a long while on . . . instruments this time are you?” Mulgrew then said, “I reckon Bird’s through here and—Ross Island there.” Maloney answered, “Yes,” and Mulgrew continued, “Erebus should be there.” Captain Collins says, “Right.” For the next forty seconds the crew discussed radio and navigation frequencies.

At 00:49:08, Mulgrew said, “That looks like the edge of Ross Island there.” Cassin attempted to contact McMurdo Tower. At 00:49:24, Maloney said, “I don’t like this.”

At 00:49:30, Captain Collins said, “We’re twenty-six miles north we’ll have to climb out of this.” Someone answered, “OK.” Cassin told Collins, “It’s clear on the right and (well) ahead.” Collins asked, “Is it?” Mulgrew said, “Yes.” Cassin, said, “No negative.” Cassin said, “No high ground if you do a one eighty.”

At 00:49:44 the airliner’s Ground Proximity Warning System is heard: WHOOP WHOOP—PULL UP—WHOOP WHOOP

00:49:48 Flight Engineer Brooks reports, “Five hundred feet.”

PULL UP

Brooks: “Four hundred feet.”

WHOOP WHOOP—PULL UP—WHOOP WHOOP

Captain Collins calls, “Go round power please.”

WHOOP WHOOP—PULL

At 00:49:50 GMT, ZK-NZP struck gradually rising terrain at an elevation of 1,467 feet (447 meters) above Sea Level, while flying at 260 knots (299 miles per hour/482 kilometers per hour). The DC-10 was totally destroyed and all 257 persons on board were instantly killed by the impact. The site of the crash was on the north slope of Mount Erebus, approximately 31 miles (50 kilometers) north of McMurdo Station, at Latitude 77˚25’30” South, Longitude 167˚27’30″East.

The navigation computer showed teh position of Flight 901, farther south and slightly left of its actual track—closer to Mount Erebus.
The navigation computer showed the position of Flight 901 a few miles farther to the south and slightly left of its actual track—closer to Mount Erebus. (Transport Accident Investigation Commission)
This detailed graphic shows the flight path an descent of Flight 901 and correlates the FDR data to give an idea of where the airplane actually was and where the crew thought it was..
This detailed graphic shows the flight path and descent profile of Flight TE 901 and correlates CVR and FDR data to give an idea of where the airplane actually was and where the crew thought it was. (Transport Accident Investigation Commission)
Crash site of Air new Zealand Flight 910 on teh slopes of Mount Erebus, Antarctica. (Bereau d'Archives des Accidents d'Avions)
Looking west at the crash site of Air New Zealand Flight TE 910 at an elevation of 1,467 feet (447 meters) above Sea Level, on the north slope of Ross Island, Antarctica. Mount Erebus is at the upper left of the photograph. The terrain has a gradual upward slope of 13˚, and cross slope, right to left, of -5˚. The debris field is aligned on a heading of 190˚ True and is approximately 570 meters long. (Bureau d’Archives des Accidents d’Avions)

The intensive investigation of the accident showed that, based on the route briefing, the flight crew expected to be about 26 miles to the west. In fact, TE 901 had proceeded almost precisely along the planned track. Analysis of the navigation computer showed that its INS position was in error by just 3.1 nautical miles (3.6 miles/ 5.7 kilometers), well within its known tolerance. It was indicating almost the exact location of the flight, if anything, closer to Mount Erebus than it really was.

Much controversy ensued over who was at fault for the position error. Regardless of whether the flight was on the intended track, or on the erroneous track 25 miles west, the crew was fully aware that they were well north of McMurdo Station. Air New Zealand had established a minimum safe altitude of 16,000 feet (4,877 meters) until the flight was south of McMurdo.

3.37     Probable cause: The probable cause of this accident was the decision of the captain to continue the flight at low level toward an area of poor surface and horizon definition when the crew was not certain of their position and the subsequent inability to detect the rising terrain which intercepted the aircraft’s flight path.

AIRCRAFT ACCIDENT REPORT No. 79-139, Transport Accident Investigation Commission (TAIC), New Zealand, Section 3.37 at Page 34.

ZK-NZP was a McDonnell Douglas DC-10-30, s/n 46910, built at the Douglas Aircraft Company’s Long Beach, California, plant during November 1974. It arrived in New Zealand 14 December 1974 for service with Air New Zealand Limited. The –30 was a long range variant of the DC-10 series. It is designed to be operated by a flight crew of three. It is 182 feet, 1 inch (55.499 meters) long with a wingspan of 165 feet, 5 inches (50.419 meters) and overall height of 58 feet, 1 inch (17.704 meters.) One of the original “wide body” jets, the cylindrical fuselage of the DC-10 has a diameter of 19 feet, 9 inches (6.020 meters).

The DC-10-30 was powered by three General Electric CF6-50C turbofan engines, rated at 51,000 pounds of thrust (226.86 kilonewtons) at Sea Level. The CF6-50 is a two-spool, high-bypass-ratio axial-flow turbofan engine. It has a single-stage fan section, with a 17-stage compressor (3 low- and 14 high-pressure stages, and a 6-stage turbine (2 high- and 4 low-pressure stages). The CF6-50C has a maximum diameter of 8 feet, 9.0 inches (2.667 meters), fan diameter of 7 feet, 2.4 inches (2.195 meters) and length of 15 feet, 8.0 inches (4.775 meters). It weighs 7,896 pounds (3,582 kilograms).

The DC-10-30 has an empty weight of 266,191 pounds (120,742 kilograms) and maximum takeoff weight of 572,000 pounds (259,455 kilograms). ZK-NZP, operating as Flight TE 901, had an “all-up weight” of 199,150 kilograms (439,051 pounds), and for the conditions of this flight, the MTOW was calculated to be 253,105 kilograms (558,001 pounds). It’s actual takeoff weight was 246,507 kilograms (543,455 pounds).

The typical cruise speed of the DC-10 is 0.82 Mach (556 miles per hour, or 895 kilometers per hour, at 30,000 feet/9,144 meters) and its service ceiling is 42,000 feet (12,802 meters). The DC-10-30 variant has a maximum range of 6,600 miles (10,622 kilometers).

At the time of the accident, ZK-NZP had flown 20,763 hours since new (TTSN).

The largest remaining fragment of McDonnell Douglas DC-10-30 ZK-NZP was this portion of the fuselage and wings.
The largest remaining fragment of McDonnell Douglas DC-10-30 ZK-NZP was this portion of the fuselage and wings. (AP Images)

© 2016, Bryan R. Swopes

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