Montana

The pilots obtained a complete weather briefing for their IFR flight. Before landing at their destination, they attempted to obtain an airport advisory on Unicom, but received no response. They landed on the runway in low visibility with the runway lights visible. After touchdown, the left main landing gear contacted a berm or snowbank on the left side of the plowed area, and the pilots were unable to maintain directional control. The aircraft drifted off the left side of the runway and came to rest on a reverse heading. The runway, which was 100 feet in width, had been plowed to about 45.5 feet width along the centerline. No notams had been filed concerning the partially plowed condition of the runway. The second officer (commercial pilot) noted that during the weather briefing, the pilot-in-command had been advised of thin, loose snow on the runway.

While performing an ILS approach at night and in IMC, the airplane collided with trees in mountainous terrain prior to the IAF. The MDA prior to the IAF is 10,600 feet. The descent altitude at the outer marker is 7,713 feet. The wreckage was located under the localizer path at an elevation of 7,600 feet. Damage to tree tops along the wreckage distribution path indicates that the airplane travelled through the trees on a level plane until contact with the ground approximately 300 feet into the path. Light snow was falling at the time of the accident and visibility was deteriorating due to fog. During the post crash investigation, there was no evidence found to indicate a mechanical failure or malfunction.

The airplane was level at FL220 at night when vertical fluctuations in altitude up to 500 feet above altitude were noted by the Salt Lake Center controller. Immediately thereafter, the aircraft began a descent and transponder targets were lost. A trajectory study showed the aircraft descending in a tight right turn. Examination of the wreckage revealed that the right elevator separated in negative overload with both wings separating negatively. Wreckage distribution established separation of the empennage and its associated control surfaces before the separation of the wings. A preimpact fire was witnessed and the main fuselage was destroyed by an intense post crash fire. The initiating event which resulted in the altitude divergence and descending turn could not be determined.

The aircraft departed Missoula on a fire fighting mission under callsign Tanker 04. The crew apparently became fixated on the malfunction of the retardant-release doors and did not realize the tanker was entering a narrow box canyon when it struck the slope of Mt Squaw located about 20 miles northwest of Missoula Airport. The aircraft was destroyed and both pilots were killed.

During descent into Billings, the Citation was sequenced behind a Boeing 757, and both airplanes were eventually cleared for visual approaches. About 1-1/2 mile from the runway the Citation was observed to roll rapidly to the inverted position and descended almost vertically into the ground. According to ATC transcripts and the airplane's cockpit voice recorder, the crew of the Citation had maintained visual awareness of the position of the B757 throughout the approach. At the time of the upset, the vertical separation between airplanes was 600 - 1,000 feet, and the horizontal separation was decreasing below 2.6 miles. One of the Citation captain's last comments was 'almost ran over a seven fifty seven.' Winds were 5 knots. All eight occupants were killed.

The aircraft departed McChord AFB on an air refuelling mission over Montana. While cruising at an altitude of 25,000 feet by night, the aircraft collided under unknown circumstances with a second USAF Lockheed C-141B-LM Starlifter registered 66-0142, carrying six crew members and taking part to the same mission. Both aircraft entered an uncontrolled descent, disintegrated in the air and crashed about 14 km north of Harlem. All 13 occupants in both aircraft were killed.

The aircraft departed McChord AFB on an air refuelling mission over Montana. While cruising at an altitude of 25,000 feet by night, the aircraft collided under unknown circumstances with a second USAF Lockheed C-141B-LM Starlifter registered 65-0255, carrying seven crew members and taking part to the same mission. Both aircraft entered an uncontrolled descent, disintegrated in the air and crashed about 14 km north of Harlem. All 13 occupants in both aircraft were killed.

Air tanker N924AU had been dispatched from its base in Santa Barbara, CA to Missoula, MT to support fire suppression efforts involving a number of large fires in the Northern Region. The flight departed in VFR conditions at 16:05 PDT. While still in the area controlled by the Oakland FAA Air Route Traffic Control Center (ARTCC), the crew requested and received an Instrument Flight Rules (IFR) clearance. They were assigned an altitude of 23,000 feet. The Orion proceeded uneventfully and was handed off to the Approach Controller at Missoula (MSO). MSO Approach did not have, at that time, terminal radar equipment that covered their entire area of responsibility. At first contact with MSO Approach, the Orion was 26 miles southeast of the Missoula International Airport and descending to 12,000 feet. In the course of several exchanges between the Orion and the MSO Approach Controller, it was disclosed and confirmed that the Orion’s flight crew did not have the approach plate (or chart) depicting the published approach procedure for the VOR-DME Bravo (B) approach, which was the approach in use for aircraft arriving from the south. Clearance was nevertheless offered and accepted and the controller provided the information as the Orion crew began to execute the VOR-DME B approach. At this time, the cloud bases at the MSO Airport were at about 7,900 feet and other aircraft making instrument approaches there were descending through 8,000 feet, cancelling their IFR flight plans and making visual approaches to the airport for landing. Since the Orion’s crew was able to monitor these radio communications/transmissions on the same frequency, they were probably counting on doing the same. At this time, there were very strong winds and moderate to severe turbulence reported at altitudes above 8,000 feet that increased with altitude in the MSO area. In addition to turbulence, the Orion crew contended with effects of flying at high altitudes, using oxygen in an unheated and un-pressurized aircraft for more than two hours. At some point in the initial phase of the approach, some confusion as to what heading to fly apparently occurred and the airtanker turned back toward the south, away from MSO. By this time the controller had authorized descent to 8,600 feet on an approximate heading of 200 degrees magnetic. MSO Approach received notification by Salt Lake City ARTCC (Center) that this airtanker was west of the course consistent with the approach procedure and subsequent notification that the airtanker had disappeared off Center’s radar screen. Repeated attempts to contact the Orion crew failed and MSO Approach notified the County Sheriff’s office, the Forest Service, and other agencies that the aircraft was missing and presumed down. Search and rescue attempts were not able to detect an Emergency Locator Transmitter (ELT) signal. The mishap site was located the following day.
Source: https://www.fs.usda.gov/managing-land/fire by Candy S. Rock Fitzpatrick.

Airspur flight 500, a domestic cargo flight, departed Kalispell, MT, at 1903 mdt with an IFR flight plan to Great Falls, MT. At 1922, the pilot notified Salt Lake ARTCC he was returning to Kalispell due to a rough running engine. Shortly thereafter, the pilot reported the engine had failed completely. The pilot made an emergency forced landing on a mountain ridge at the approximately 5,500 feet level in IFR conditions. Accident location was approximately 18 nm east of Kalispell. Engine disassembly later revealed the #4 connecting rod had failed catastrophically. The pilot escaped with minor injuries.

This accident occurred during a night, ILS approach to runway 27 in IMC. The aircraft collided with a mountain 12 nm east-southeast of the airport while turning inbound to intercept the localizer course. Investigation revealed that one VOR receiver was set on the destination ILS frequency, the second VOR was set on an en route VOR 51 nm west of the destination airport, and the DME radio, a separate transceiver, was set on the destination DME transmitter. The frequencies of the en route VOR and the destination VOR were 117.1 and 117.7, respectively. The outbound course for the ILS approach procedure was 088° and the accident site was located on the 088 radial of the en route VOR. Investigation also revealed that the pic was occupying the right front seat and an experienced pilot who was not current in this aircraft was occupying the left seat. The second VOR receiver control head was located in the lower right portion of the instrument panel, in a location where the selected frequency was difficult to read. All three occupants were killed.