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Crash of a Polikarpov P-5 in Povarovo: 2 killed

Date & Time: Mar 12, 1934 at 0446 LT
Type of aircraft:
Operator:
Registration:
CCCP-L1502
Flight Phase:
Flight Type:
Survivors:
No
Schedule:
Moscou – Leningrad
MSN:
7322
YOM:
1934
Country:
Region:
Crew on board:
2
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
2
Aircraft flight hours:
65
Aircraft flight cycles:
20
Circumstances:
The crew departed Moscow Airport at 0420LT on a night mail flight to Leningrad. Few minutes after takeoff, weather conditions deteriorated with low ceiling and intermittent snow falls. While cruising at a height of 100 metres, the airplane entered a right turn, descended to the ground and crashed 2 km from the Poverovo Station. The aircraft was totally destroyed and both crew members were killed.
Probable cause:
The accident resulted from a loss of control in flight followed by a ground impact with an engine running normally at impact.
The following contributing factors were identified:
- Poor preparation for a night flight in difficult flying conditions due to low ceiling and snow falls;
- The pilot was unfamiliar with the Moscow - Leningrad route;
- Poor flight planning;
- The airspeed indicator only worked intermittently;
- Weather conditions deteriorated significantly during the flight.

Crash of a Polikarpov P-5 in Balashov

Date & Time: Dec 24, 1933 at 1245 LT
Type of aircraft:
Operator:
Registration:
CCCP-Sh629
Flight Phase:
Flight Type:
Survivors:
Yes
Schedule:
Balashov - Balashov
MSN:
5409
YOM:
1932
Country:
Region:
Crew on board:
2
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
0
Aircraft flight hours:
224
Aircraft flight cycles:
1228
Circumstances:
The crew (one cadet and one instructor) departed Balashov Airport at 1240LT on a local training mission. After takeoff, the crew completed two turns then climbed to the altitude of 350 metres and eventually entered clouds. About five minutes after its departure, the aircraft started to descend and reached the speed of 160 km/h. The instructor attempted to regain control but the airplane impacted ground and crashed, coming to rest upside down 4 km south of the airfield. The aircraft was destroyed and both occupants were seriously injured.
Probable cause:
The accident was the consequence of the combination of the following factors:
- The pilots lost visual contact with the ground after entering the clouds;
- The crew made a decision to reduce altitude and attempt to establish visual contact with the ground rather than continuing under Instrument Flight Rules;
- The crew failed to follow instructions not entering the clouds;
- The crew confusion;
- Insufficient crew training in blind conditions.