Investigation Summary
TWA Flight 277 was a scheduled military contract flight transporting one U.S. Army Air Force passenger and six civilian crew members. During the leg from Newfoundland to Washington D.C., the flight encountered a severe weather system over New Brunswick and Maine. The combination of high winds and intense electrical activity caused significant radio static, which interfered with the crew's ability to utilize radio navigation aids. Specifically, static interference prevented the crew from obtaining a reliable fix on the Bangor radio beacon. This led to an undetected lateral drift of 70 miles (110 km) from the intended flight path. While the crew believed they were over lower terrain, they had actually drifted into the mountainous region of Baxter State Park. At approximately 3,700 feet (1,100 m) elevation, the aircraft's starboard wing struck a ridge of boulders on Fort Mountain, just 135 feet below the 3,835-foot summit, leading to a total loss of control and high-energy impact.
Final Conclusions
The accident was attributed to spatial disorientation and navigational errors caused by severe weather conditions. The primary factors were the failure to compensate for wind drift and the loss of radio navigation due to atmospheric interference, which resulted in the aircraft flying at an altitude insufficient to clear the mountainous terrain in its path.
Photographic Evidence (1)
Video Analysis
No video analysis linked for this case file yet.
Systems & Failure Modes
Radio Navigation
The aircraft's radio equipment was rendered ineffective by heavy static caused by lightning, preventing the crew from identifying their true position.
Interesting Facts
- 01The flight was a scheduled contract operation for the Air Transport Command.
- 02The crash site was located on Fort Mountain in Maine's Baxter State Park.
- 03The aircraft was flying at an altitude of less than 4,000 feet while terrain in the area exceeded 5,000 feet.
- 04All six crew members were civilian employees of Transcontinental and Western Air (TWA).
- 05The sole passenger was a member of the United States Army Air Force.
Safety Actions & Advisories
Radio Navigation Reliability
Source ↗The investigation highlighted the vulnerability of LF/MF radio ranges to atmospheric static. It reinforced the need for the development and implementation of VHF-based navigation systems (like VOR) which are less susceptible to lightning interference.
Terrain Clearance Procedures
Source ↗The accident emphasized the necessity for stricter adherence to minimum en route altitudes (MEA) when navigational certainty is lost due to weather, particularly in regions with significant terrain like the Appalachian range.