The 1946 Railway Air Services Dakota crash was the crash of a Douglas Dakota 3 of the British airline Railway Air Services 1 km north-east of Northolt Airport, London, United Kingdom on 19 December 1946.

KG420 was registered to Railway Air Services as a Dakota 3 in March 1946 with the British registration G-AGZA, powered by 2 Pratt & Whitney R-1830-92 Twin Wasp engines.

While the Dakota was waiting the temperature dropped and snow began falling which froze on the wings.

When the flight received clearance, the pilot ran the engines up to 45.5 inches of manifold pressure and 2,500 RPM.

[4] The aircraft flew only a few metres high straight down Angus Drive from the end of the runway until the left wing contacted some rooftops and the aircraft slewed through 90 degrees and came to rest on the roofs of two houses at 44 & 46 Angus Drive in the London suburb of South Ruislip.