ASN Aircraft accident Yakovlev Yak-40 VN-A449 Son Trung

Home » Database » 1992

Status:	Accident investigation report completed and information captured
Date:	Saturday 14 November 1992
Time:	07:12
Type:	Yakovlev Yak-40
Operator:	Vietnam Airlines
Registration:	VN-A449
MSN:	9631848
First flight:	1976
Total airframe hrs:	4668
Cycles:	3686
Engines:	3 Ivchenko AI-25
Crew:	Fatalities: 6 / Occupants: 6
Passengers:	Fatalities: 24 / Occupants: 25
Total:	Fatalities: 30 / Occupants: 31
Aircraft damage:	Damaged beyond repair
Location:	near Son Trung ( Vietnam)
Phase:	Approach (APR)
Nature:	Domestic Scheduled Passenger
Departure airport:	Ho Chi Minh City-Tan Son Nhat International Airport (SGN/VVTS), Vietnam
Destination airport:	Nha Trang Airport (NHA/VVNT), Vietnam
Flightnumber:	474

Narrative:
Vietnam Airlines flight 474 was destroyed when it impacted terrain near Son Trung, Vietnam. Of the 31 occupants, one passenger survived.
The aircraft, a Yak-40, operated on a domestic flight from Ho Chi Minh City to Nha Trang. When descending towards Nha Trang the aircraft went below the minimum safe altitude. Also, the aircraft deviated 6 km off the W-13 airway.
Flying over mountainous terrain, the aircraft impacted the top of a ridge, struck some trees and crashed 350 m further on, at an elevation of 970 m. Rescue workers reached the wreckage after eight days.
Weather reported at Nha Trang was Wind 310° 1 m/s, 3cu at 300 m, 5cu at 500 m and 8sc at 1500 m, temperature 25°c and QFE 758.9.

Classification:

Controlled Flight Into Terrain (CFIT) - Mountain

Sources:

» Soviet Transports
» Flight International
» Vietnam Air Accident Inquiry Organisation

Follow-up / safety actions

issued 5 Safety Recommendations

Show all...

Photos

accident date: 14-11-1992
type: Yakovlev Yak-40
registration: VN-A449

Map

This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Ho Chi Minh City-Tan Son Nhat International Airport to Nha Trang Airport as the crow flies is 316 km (198 miles).
Accident location: Global; accuracy within tens or hundreds of kilometers.

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.

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Yakovlev Yak-40

1136 built
74^th loss
33^rd fatal accident
7^th worst accident (at the time)
10^th worst accident (currently)

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Vietnam

18^th worst accident

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Issued: --	To:	VN-A449 (1)
The Ministry of Defence, the Civil Aviation Administration of Vietnam should take into consideration with a view to increase the minimum obstacle clearance altitudes for routes over mountainous areas along the coast. All airports should be equipped with approach radars.
Issued: --	To:	VN-A449 (2)
Aviation meteorology industry should in close collaboration with the General Directorate of Hydrometeorology pay more attention to the characteristics of the meteorological forecasts for Aviation industry, inform timely of thunderstorms, low pressure and climate changes in order to take precaution against windshears and vortex which cause violent downdraft and updraft.
Issued: --	To:	VN-A449 (3)
Control towers at airports near the coast should have adequate meteorological equipment, and the controllers should improve their skills in controlling aircraft during approach.
Issued: --	To:	VN-A449 (4)
Regarding Nha Trang Airport, if there appears a typhoon 250-400 km away, that typhoon should be watched and kept trace. If the typhoon is within a radius of 200 km or the airport is within the typhoon area, an alert should be initiated and the airport should be closed. Aircraft should be flown at the level of at least 2,000 metres above the highest obstacle along the route W-13 (Da Lat - Nha Trang).
Issued: --	To:	VN-A449 (5)
The Government should promulgate a decision as soon as possible to form a National Committee for Search and Rescue, and there should be a decree for its operation from central to grassroots levels.