38 Years ago today: On 11 October 1984 an Aeroflot Tupolev 154 collided with a snowplough on landing at Omsk, killing 178 people.

Date:Thursday 11 October 1984
Type:Silhouette image of generic T154 model; specific model in this crash may look slightly different
Tupolev Tu-154B-1
Operator:Aeroflot, East Siberia Civil Aviation Directorate
First flight:1977
Engines:Kuznetsov NK-8-2U
Crew:Fatalities: 5 / Occupants: 9
Passengers:Fatalities: 169 / Occupants: 170
Total:Fatalities: 174 / Occupants: 179
Ground casualties:Fatalities: 4
Aircraft damage:Destroyed
Aircraft fate:Written off (damaged beyond repair)
Location:Omsk Airport (OMS) (https://cdn.aviation-safety.net/database/country/flags_15/RA.gif   Russia)
Crash site elevation:95 m (312 feet) amsl
Phase:Landing (LDG)
Nature:Domestic Scheduled Passenger
Departure airport:Krasnodar Airport (KRR/URKK), Russia
Destination airport:Omsk Airport (OMS/UNOO), Russia

Aeroflot Flight 3352 was a regular domestic service from Krasnodar to Omsk and Novosibirsk, Soviet Union (now Russia).
The aircraft, a Tupolev Tu-154B-1, took off from Krasnodar at 23:37 hours Moscow time.
At 05:15 local time (02:15 Moscow time), three vehicles were dispatched to the runway at Omsk Airport to carry out work. The vehicles were not equipped with radios that would allow listening to the tower frequency, nor with rotating flashing beacons.
Meanwhile, flight 3352 was descending towards Omsk. Visibility was 3000 m, with rain, and haze. Temperature was +3°C and ceiling was measured at 110 m.
At 05:33, the landing controller turned on the runway lights. The aircraft touched down at 05:39 hours. Immediately after touching down at a speed of about 140 knots the crew noticed vehicles on the runway. An evasive manoeuvre was of no avail as the aircraft struck three vehicles and a fire erupted. Four occupants of the vehicles and 174 occupants of the aircraft died in the crash.

One of the controllers had fallen asleep and thus failed to inform the approach controller about the presence of the vehicles on the runway.