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 Polikarpov SP near Troitskoye: 1 killed

Date & Time: Dec 30, 1935
Type of aircraft:
Operator:
Registration:
CCCP-L971
Flight Phase:
Flight Type:
Survivors:
No
Schedule:
Khabarovsk – Troitskoye – Komsomolsk-on-Amur
MSN:
7128
YOM:
1935
Country:
Region:
Crew on board:
1
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
1
Circumstances:
The pilot departed Khabarovsk on a mail flight to Komsomolsk-on-Amur with an intermediate stop in Troitskoye. On the second leg, he encountered unfavorable winds and attempted an emergency landing when the airplane crashed in a swampy area. As the airplane failed to arrive at destination, SAR operations were initiated but eventually suspended few days later as no trace of the aircraft was found. On 13 April 1938, the wreckage was found by hunters some 52 km from the Khungari River estuary.
Probable cause:
It is believed that the pilot encountered unfavorable winds and attempted an emergency landing when the airplane crash landed in a swampy area. The pilot apparently survived the accident but it is possible that he was killed by hunters.

Crash of a Polikarpov P-5 off Posolskoye: 2 killed

Date & Time: Dec 16, 1935 at 1600 LT
Type of aircraft:
Operator:
Registration:
CCCP-L1555
Flight Phase:
Flight Type:
Survivors:
No
Schedule:
Irkutsk – Ulan-Ude – Mogocha
MSN:
8259
YOM:
1934
Country:
Region:
Crew on board:
1
Crew fatalities:
Pax on board:
1
Pax fatalities:
Other fatalities:
Total fatalities:
2
Circumstances:
The single engine airplane departed Irkutsk Airport on a cargo flight to Mogocha, carrying one passenger, one pilot and a load of 230 kg of various goods. En route, the engine caught fire an the pilot attempted an emergency landing when the airplane crashed on the ice of Lake Baïkal, some 10 km west of Posolskoye. SAR operations were initiated three days later only. The aircraft was totally destroyed by a post crash fire and both occupants were not found. Some foot print were found on ice and snow but both occupants were later considered as deceased.
Probable cause:
Engine fire in flight, maybe following the failure of a fuel supply or a malfunction of the carburetor.

Crash of a Laville PS-89 (ZIG-1) in Moscow: 6 killed

Date & Time: Nov 29, 1935
Type of aircraft:
Registration:
CCCP-L2140
Flight Type:
Survivors:
No
Schedule:
Moscow - Moscow
MSN:
01
YOM:
1935
Country:
Region:
Crew on board:
6
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
6
Circumstances:
A crew of six (pilots and engineers) was conducting a test flight on this first prototype of the Russian Manufacturer Laville. The aircraft was designed by the French engineer André Laville but all construction was performed on behalf of Zavod Imeni Goltsman (ZIG). On approach to Moscow, the aircraft went out of control and crashed in a field, killing all six occupants, among them the Russian test pilot A. V. Kulev.
Probable cause:
Loss of control following a structural failure of the tail. The crash was attributed to a flaw in the workmanship, not in the design, and work continued on the project under the leadership of P. I. Eberzin.