Republic of Yakutia (Sakha)

Survivors:

Site:

Mountains

Schedule:

Moma - Ust-Nera

MSN:

1159 473 12

YOM:

1961

Location:

Tyubelyakh

Country:

Region:

Crew on board:

Crew fatalities:

Pax on board:

Pax fatalities:

Other fatalities:

Total fatalities:

Aircraft flight hours:

8979

Circumstances:

The crew encountered low clouds and poor weather conditions while following the valley of the river Tikhon-Yuryakh. The decision to return was taken too late so the aircraft was unable to clear the obstacles. It struck tree tops and crashed at a height of 1,080 meters into a mountain slope located near the Moma Pass (1,444 meters high) and 19 km northeast of Chumpu-Kytyl (Tyubelyakh). The aircraft was destroyed by impact forces and a post impact fire. A pilot and a passenger were injured while the second pilot and five passengers were killed.

Probable cause:

The accident was the consequence of:
- Wrong decisions taken by the crew,
- Poor flight preparation,
- Insufficient or erroneous information about enroute weather conditions.

Crash of an Antonov AN-2 in Toko

Date & Time: Sep 25, 1971

Type of aircraft:

Antonov AN-2

Operator:

Registration:

CCCP-98281

Flight Phase:

Flight

Flight Type:

Survivors:

Site:

Plain, Valley

MSN:

1101 473 07

YOM:

1958

Location:

Toko

Country:

Region:

Crew on board:

Crew fatalities:

Pax on board:

Pax fatalities:

Other fatalities:

Total fatalities:

Circumstances:

The engine failed in flight and the aircraft crash landed near Tokko. There were no casualties but the aircraft was damaged beyond repair.

Probable cause:

Engine failure.

Crash of an Antonov AN-12B in Batagay

Date & Time: May 25, 1971 at 1301 LT

Type of aircraft:

Antonov AN-12

Operator:

Registration:

CCCP-11024

Flight Phase:

Flight Type:

Cargo

Survivors:

Site:

Schedule:

Yakutsk - Batagay

MSN:

7 3 448 09

YOM:

1967

Location:

Batagay

Country:

Region:

Crew on board:

Crew fatalities:

Pax on board:

Pax fatalities:

Other fatalities:

Total fatalities:

Aircraft flight hours:

5532

Aircraft flight cycles:

1225

Circumstances:

The airplane was completing a cargo flight from Yakutsk to Batagay, carrying a crew of six, two passengers and a load of pipes for a total weight of 11,350 kilos. Following an uneventful flight and approach, the crew completed the landing in good conditions. According to the crew and eyewitnesses, the touchdown was smooth about 74 meters past the runway threshold at a speed of 250 km/h. After a course of 105 meters, a loud sound was heard on the right side of the aircraft. While decelerating, the aircraft deviated to the right when, at a speed of 210 km/h, the engine n°4 struck the ground. The airplane veered off runway to the right, struck an earth mound then trees, pivoted on itself before coming to rest in flames 710 meters after the initial impact and 30 meters to the right of the runway. All eight occupants evacuated safely while the aircraft was damaged beyond repair.

Probable cause:

The right main landing gear leg broke shortly after touchdown, probably due to fatigue fracture. Investigations were unable to accurately define the landing parameters because the aircraft was not equipped with the latest generation of FDR systems. The failure of the right main gear could be explained by a prolonged operation of the aircraft under very low temperatures with a large number of landings completed with a total weight at the limit of tolerances. Also, the fact that the flaps were deployed at 25° upon landing resulted in a speed increase of approximately 20 km/h compared to a landing configuration with flaps extended at 35°, which could also be considered as a contributing factor.

Crash of an Ilyushin II-14M in Ust-Maya: 5 killed

Date & Time: Feb 25, 1970 at 2035 LT

Type of aircraft:

Ilyushin II-14

Operator:

Registration:

CCCP-61637

Flight Phase:

Takeoff (climb)

Flight Type:

Positioning

Survivors:

Site:

Schedule:

Ust-Maya - Yakutsk

MSN:

1460 009 37

YOM:

1956

Location:

Ust-Maya

Country:

Region:

Crew on board:

Crew fatalities:

Pax on board:

Pax fatalities:

Other fatalities:

Total fatalities:

Circumstances:

On a positioning flight from Ust'-Maya to Yakutsk at night with the center of gravity being out of the envelope (too far forward), the right propeller developed negative thrust (due to a malfunction) shortly after takeoff. The crew was unable to counteract as the altitude was too low and the aircraft crashed in a forest located 1,350 metres behind the runway threshold and 310 metres to the right of the runway extended centerline. All 5 crew members were killed.

Probable cause:

The right propeller developed negative thrust during initial climb.

Crash of an Antonov AN-24B near Batagay: 34 killed

Date & Time: Jan 28, 1970 at 2053 LT

Type of aircraft:

Antonov AN-24

Operator:

Registration:

CCCP-47701

Flight Phase:

Flight Type:

Survivors:

Site:

Mountains

Schedule:

Chokurdakh - Batagay

MSN:

59900202

YOM:

1965

Location:

Batagay

Country:

Region:

Crew on board:

Crew fatalities:

Pax on board:

Pax fatalities:

Other fatalities:

Total fatalities:

Circumstances:

Following an uneventful flight, the crew was cleared to descent to 2,700 meters and received all information related to the destination airport. Shortly later, the crew informed ATC about their ETA in eight minutes. As the pilot has the runway in sight, he was cleared to descend to 600 meters. While cruising at an altitude of 1,020 meters at a speed of 350 km/h in a 7° nose-down attitude and a 3° left bank, the airplane struck the slope of a mountain (1,081 meters high) located 40 km from the airport. The airplane disintegrated on impact and all 34 occupants were killed.

Probable cause:

It was determined that the ground collision was the consequence of a premature descent on part of the pilot-in-command who continued the approach below the minimum safe altitude. The lack of visibility caused by night and the lack of assistance on part of ATC were considered as contributing factors.

Crash of an Antonov AN-10 in Mirny

Date & Time: Oct 12, 1969

Type of aircraft:

Antonov AN-10

Operator:

Registration:

CCCP-11169

Flight Phase:

Flight Type:

Survivors:

Site:

Schedule:

Irkutsk - Mirny

MSN:

9 4 015 01

YOM:

1959

Location:

Mirny

Country:

Region:

Crew on board:

Crew fatalities:

Pax on board:

Pax fatalities:

Other fatalities:

Total fatalities:

Circumstances:

Upon landing on a snow covered runway at Mirny Airport, the airplane went out of control, veered off runway and collided with a trench. There were no injuries among the occupant but the aircraft was damaged beyond repair. The thickness of the snow was 1-2 cm and the crew was not aware of the presence of trench by the runway.

Crash of a PZL-Mielec AN-2 off Tiksi: 5 killed

Date & Time: Sep 26, 1969 at 2027 LT

Type of aircraft:

PZL-Mielec AN-2

Operator:

Registration:

CCCP-44984

Flight Phase:

Flight Type:

Survivors:

Site:

Lake, Sea, Ocean, River

Schedule:

Borogon – Tiksi

MSN:

1G27-06

YOM:

1963

Flight number:

T-2

Location:

Tiksi

Country:

Region:

Crew on board:

Crew fatalities:

Pax on board:

Pax fatalities:

Other fatalities:

Total fatalities:

Aircraft flight hours:

5515

Aircraft flight cycles:

3918

Circumstances:

On final approach to Tiksi by night and poor weather conditions, while at an altitude of 300 meters and a speed of 150 km/h, the engine failed. The airplane stalled and crashed into the Tiksi bay, some 2.5 km from the runway threshold. A passenger was rescued while five other occupants were killed.

Probable cause:

The engine failed on approach to Tiksi Airport due to the failure of exhaust valves, pistons and cylinders. It was also determined that the cylinder head temperature decreased on final approach and that the carburetor was iced, causing the engine to lose power and the aircraft to suffer a reduction of aerodynamic performances.

Crash of an Ilyushin II-18V in Yakutsk

Date & Time: Sep 10, 1969 at 1525 LT

Type of aircraft:

Ilyushin II-18

Operator:

Registration:

CCCP-75791

Flight Phase:

Flight Type:

Survivors:

Site:

Yakutsk-Intl (Platon Oyunsky)

Schedule:

Krasnoyarsk – Yakutsk

MSN:

181 0040 05

YOM:

1961

Flight number:

SU093

Location:

Country:

Region: