Aeroflot Flight 29674
Bugulminsky OJSC, a unit of Aeroflot Yakovlev Yak-40 · Unexplained engine failure on takeoff, loss of control
From Nizhnevartovsk Airport (NJC) to Bugulma Airport (UUA)
Event
- Event typeAccident: someone killed or seriously injured, or the aircraft substantially damaged (NTSB definition). Incident: an occurrence that affected or could have affected safety, short of that. Glossary
- Accident
- Event fatalities
- 27 · all aircraft and ground
- Ground fatalities
- Unknown
- Occupants
- 31
- Survivors
- 4
- InjuriesFatal: death within 30 days. Serious: over 48 hours in hospital within a week, most broken bones, severe bleeding, nerve or organ damage, or serious burns. Minor: anything less. Glossary
- Unknown
- OperationWhat kind of flying it was, grouped by the rules it flew under: airline (US Part 121), air taxi and commuter (Part 135), general aviation (Part 91 and similar), military or government. Glossary
- Airline
Yakovlev Yak-40
- Aircraft type
- Yakovlev YAK-40
- Category
- Airplane · from aircraft type
- RegistrationThe aircraft's tail number, such as N12345 or G-ABCD. Registrations are reissued, so the same one years apart can be a different aircraft. Glossary
- CCCP-87549
- Onboard fatalities
- 27
- Route
- From Nizhnevartovsk Airport (NJC)To Bugulma Airport (UUA)
Cause areas
- Aircraft › Aircraft power plant
From the investigation findings the Wikipedia article reports, sorted into the NTSB's cause areas with AI assistance.
Approximate · Coordinates from the Wikipedia article; not checked against an investigation report.
From the Wikipedia article
Aeroflot Flight 29674 was a domestic passenger flight in RSFSR, Soviet Union, en routing Nizhenvartovsk - Tyumen - Bugulma. On 24 January 1988, the Yakovlev Yak-40 hit a powerline, and crashed into a ravine slope just shortly after take-off, killing 27 of the 31 on board.
Accident
The plane began taking off from Nizhnevartovsk Airport at 18:50. As the plane accelerated to 150 km/h (81 knots), the flight engineer noticed the "air starter open" indicator light had illuminated. When the plane started lifting off at 215-225 km/h (116 - 122 knots), all 3 engines begin slowing down. Engine 1 and 3 only producing 6-8% while engine 2 producing 74% of its thrust. It then produced more up to 92-95%, but plane had already been slowing down and losing altitude.
At an altitude of 6 meters (19 feet), the plane clipped some treetops. After flying for 87 more meters, it crashed into the ground near the edge of a ravine. As the plane skidding for 20 more minutes, the plane entered the ravine slope at a bank angle of more than 60 degrees, then struck a power line support, completely destroying the plane. The flight lasted 92 seconds.
Investigation and cause
Investigation
The investigation concluded that the plane crash was due to the loss of power in all 3 engines during take-off leading to loss of control. However, the cause of the power loss in the engines has not been determined, there are two theories for this loss:
When the flight engineer noticed the "air starter open" indicator light had illuminated, he pulled the throttle back to idle, shutting down the other engines. After noticed the problem, the crew re-activated the take-off mode, but it was too late.
Air pockets had formed in the fuel system due to air ingress, causing the airlock that disrupted the fuel flow.
Text from the Wikipedia article “Aeroflot Flight 29674” (revision 1374520561, retrieved 2026-09-18) by its authors, under CC BY-SA 4.0. Extracted as plain text: references, tables, images and some sections are left out. Read the article
Sources
Wikipedia article: Aeroflot Flight 29674
- Article
- Aeroflot Flight 29674
- Revision
- 1374520561 · 2026-09-12 · retrieved 2026-09-18
- Wikidata
- Q16662641
- Licence
- Text CC BY-SA 4.0, by the article's authors; Wikidata CC0; town positions GeoNames (CC BY 4.0)
Where each value comes from
- Record
- Wikipedia article "Aeroflot Flight 29674" (page 77606371, revision 1374520561)
- Date
- Wikipedia infobox: date
- Place and country
- Wikipedia infobox: site
- Map position
- Wikipedia article coordinates
- Aircraft, operator and route
- Wikipedia infobox: aircraft type, registration, operator, origin and destination; route airports from the linked airport articles' Wikidata codes (OurAirports)
- Operation
- flight number in the article title
- Fatalities
- Wikipedia infobox: aircraft fatalities
- Ground fatalities
- not stated in the Wikipedia infobox
- Summary
- Wikipedia infobox: summary
Source notes (1)
- Wikipedia · Facts from the Wikipedia article's infobox and coordinates, not checked against an investigation report. Independent review pending.