Investigation Summary
The flight was originally scheduled to land at Northolt, but due to visibility being reported as only 50 yards, the captain decided to divert to London Airport (Heathrow). Although Heathrow's visibility was reported even lower at 40 yards, the captain proceeded with a Ground Controlled Approach (GCA). During the talk-down, the controller cleared the flight for a straight-in approach to Runway 28 and repeatedly updated the crew on the deteriorating conditions, eventually reporting visibility of just 30 yards. The captain was reminded that the break-off point for the approach was 140 feet. Evidence suggests the captain intentionally descended below this height to seek visual reference. When the aircraft entered a thick fog bank at roughly 100 feet, the pilot lost all visual cues and initiated an overshoot. During this maneuver, the aircraft's propellers struck the runway and the fuselage skidded for 140 feet. The aircraft briefly became airborne again before crashing 3,000 feet further down the airfield, losing its starboard wing and catching fire near a pile of drain pipes.
Final Conclusions
The public inquiry, chaired by Sir Walter Monckton, concluded that the probable cause was the captain's decision to descend below the break-off point into dense fog. A significant finding was a discrepancy in communication: while the controller reported 40 yards visibility, the surviving hostess recalled the captain telling her the visibility was 400 yards, suggesting a possible misunderstanding of the weather data. The inquiry also found that the BEA operating manual was ambiguous regarding whether decision heights were compulsory or merely advisory.
Video Analysis
No video analysis linked for this case file yet.
Systems & Failure Modes
Ground Controlled Approach (GCA)
A radar-based landing system where a ground controller provides verbal headings and descent instructions to the pilot.
Decision Height / Break-off Point
The altitude at which a pilot must initiate a missed approach if the required visual references to land are not established.
Interesting Facts
- 01The aircraft was a Vickers 610 Viking 1B, registration G-AHPN, named 'Lord St Vincent'.
- 02The aircraft's Manufacturer Serial Number (MSN) was 155.
- 03Visibility at the time of the crash was approximately 30 to 40 yards in thick fog.
- 04The aircraft struck the runway with its landing gear already retracted for the overshoot, skidding 140 feet before briefly becoming airborne again.
- 05The crash resulted in 28 fatalities out of 30 people on board (26 passengers and 4 crew members).
- 06The two survivors were a passenger and the flight hostess, Alice Steen.
Safety Actions & Advisories
Brabazon Report Recommendations
Implementation of new standards for airfield lighting in poor weather and more accurate measurement of runway visibility.
Mandatory Weather Minima
Regulations were introduced to prohibit aircraft from attempting landings when reported visibility is significantly below the operator's set minimums.
Operational Manual Clarification
BEA and other operators clarified that decision heights were compulsory limits rather than advisory guidelines.