Crash of a Tupolev ANT-7 off Sofiysk: 3 killed

Date & Time: Aug 18, 1941
Type of aircraft:
Operator:
Registration:
CCCP-L2962
Flight Phase:
Survivors:
Yes
Schedule:
Khabarovsk – Nizhnetambovskoye – Aleksandrovsk-Sakhalinski
MSN:
22286
YOM:
1934
Country:
Region:
Crew on board:
4
Crew fatalities:
Pax on board:
3
Pax fatalities:
Other fatalities:
Total fatalities:
3
Aircraft flight hours:
1182
Circumstances:
The floatplane departed Khabarovsk on a flight to Aleksandrovsk-Sakhalinski with an intermediate stop in Nizhnetambovskoye, carrying three passengers, four crew members and a load of 460 kilos of mail. About an hour after departure from Nizhnetambovskoye, while in cruising altitude, the pilot noted a leak on the right engine, between cylinders n°7 and 8. Shortly later, the right engine stopped and the crew decided to attempt an emergency landing on the Amur River. At the time of the accident, the water was glassy and upon landing some 700 metres offshore, the airplane crashed, overturned and sank. All four crew members were rescued by fishermen while all three passengers drowned.
Probable cause:
The following factors were identified:
- The right engine failed in flight, maybe after the mechanic turned off the ignition system,
- The speed of the airplane upon landing was excessive,
- The glassy water of the Amur River,
- The pilot was confused due the failure of the engine,
- The inappropriate position of the stabilizers.

Crash of a Polikarpov P-5 off Khoe: 3 killed

Date & Time: Apr 12, 1941 at 1409 LT
Type of aircraft:
Operator:
Registration:
CCCP-L1679
Flight Phase:
Survivors:
No
Schedule:
Aleksandrovsk-Sakhalinski – Khabarovsk
YOM:
1935
Country:
Region:
Crew on board:
1
Crew fatalities:
Pax on board:
2
Pax fatalities:
Other fatalities:
Total fatalities:
3
Aircraft flight hours:
563
Circumstances:
The single engine airplane departed Aleksandrovsk-Sakhalinski on a flight to Khabarovsk, carrying two passengers, one pilot and a load of 75 kg of mail. About 14 minutes into the flight, the pilot entered an area of fog. As the visibility was poor, he reduced his altitude and descended relatively fast when he lost control of the airplane that crashed on the icy Tatar Strait, about 3 km off the village of Khoe. The aircraft was destroyed and all three occupants were killed.
Probable cause:
The pilot made the decision to continue the flight in difficult weather conditions, which probably exacerbated the nervous tension and the illness from which he suffered. It is likely that he lost consciousness as he began the steep descent, due to the fact that he was suffering from chronic sclerotic inflammation of the meninges, which could lead to epileptic seizures with loss of consciousness. He had lost consciousness in 1940 at Okha Airport.

Crash of a Savoia-Marchetti S.55 off Aleksandrovsk-Sakhalinsk: 1 killed

Date & Time: Jun 21, 1936 at 1940 LT
Type of aircraft:
Operator:
Registration:
CCCP-L996
Flight Phase:
Survivors:
Yes
Schedule:
Aleksandrovsk-Sakhalinski – Viakhtu – Khabarovsk
MSN:
10528
YOM:
1933
Country:
Region:
Crew on board:
4
Crew fatalities:
Pax on board:
3
Pax fatalities:
Other fatalities:
Total fatalities:
1
Aircraft flight hours:
741
Circumstances:
The float plane was scheduled to depart Aleksandrovsk-Sakhalinsky on a regular service to Khabarovsk with an intermediate stop in Viakhtu, carrying three passengers and four crew members. Several times during the day, the takeoff was postponed due to swell and strong winds. At each time, the crew spotted wooden logs floating on water. In the evening, as the weather seems to be a little better, the crew decided to take off, facing wind. During the takeoff roll, shortly prior to rotation, the airplane collided with wooded logs. Both floats were partially torn off, the airplane nosed down and plunged into the water, coming to rest few hundred metres offshore. Six people were quickly rescued while a passenger drowned. The aircraft was towed to shore but later considered as damaged beyond repair.
Probable cause:
Collision with wooden logs while taking off from. Poor flight preparation on part of the crew who failed to ensure that the takeoff area was cleared of obstacles.

Crash of a Polikarpov P-5 in Lukolovo: 4 killed

Date & Time: Jan 22, 1936
Type of aircraft:
Operator:
Registration:
CCCP-L1738
Flight Phase:
Survivors:
No
Schedule:
Okha – Aleksandrovsk-Sakhalinski
MSN:
9483
YOM:
1935
Country:
Region:
Crew on board:
1
Crew fatalities:
Pax on board:
3
Pax fatalities:
Other fatalities:
Total fatalities:
4
Circumstances:
The airplane departed Okha in good weather conditions, carrying three passengers and one pilot to Aleksandrovsk-Sakhalinski. About 15 minutes into the flight, weather conditions worsened and the visibility was poor due to snow falls. The pilot reduced his altitude and continued along the shore. In a visibility estimated to be 15-20 metres, the pilot failed to realize he was too low. In a slight turn, the airplane impacted the ground and crashed on a icy area located in the Tatar Strait, about one km off the village of Lukolovo. The aircraft was destroyed and all four occupants were killed.
Probable cause:
Controlled flight into terrain after the pilot continued the flight at an insufficient altitude in poor visibility (15-20 metres) due to snow falls. Information transmitted to the crew regarding weather conditions en route were erroneous and did not reflect the actual conditions.

Crash of a Savoia S.55 near Lazarev: 12 killed

Date & Time: Jun 26, 1935 at 1200 LT
Type of aircraft:
Operator:
Registration:
CCCP-L840
Flight Phase:
Survivors:
No
Site:
Schedule:
Aleksandrovsk-Sakhalinski – Khabarovsk
MSN:
10530
YOM:
1933
Country:
Region:
Crew on board:
3
Crew fatalities:
Pax on board:
9
Pax fatalities:
Other fatalities:
Total fatalities:
12
Circumstances:
The float plane departed Aleksandrovsk-Sakhalinski at 1040LT on a flight to Khabarovsk, carrying nine passengers and three crew members. En route, the crew encountered poor weather conditions with reduced visibility. At 1158LT, the crew requested the last weather bulletin when radio communications were cut, about two minutes later. Too low, the airplane impacted high pine trees and crashed in a wooded area located in hilly terrain, some 80 metres below the summit. As the airplane failed to arrive at destination, SAR operations were initiated but eventually abandoned few days later as no trace of the aircraft nor the 12 occupants was found. The wreckage was found by hunters in September 1935, some 67 km from Lazarev. A watch relatively intact was found on site, indicating 1200LT. In 2016, human remains were repatriated and buried in a cemetery in Khabarovsk.
Crew:
Alexander Svetogorov, pilot,
Mr. Efremov, radio operator,
Mr. Stychenko, flight engineer.
Passengers:
Anton Vasilievich Sheremetiev,
Stepan Shchetinin,
Mr. Baraksin,
Mrs. Baraksin + one infant,
Mr. Granovsky,
Mrs. Dokuchaev,
Mr. Kornyshen,
Mr. Mednis.

Source: http://amurmedia.ru/story/savoya/
Probable cause:
Controlled flight into terrain while cruising at an unsafe altitude in limited visibility.