Beschrijving:
Shortly after takeoff from Alma-Ata on the first leg of a flight to Moscow, the left engine developed a malfunction. The aircraft reached a height of 100 m before it began losing height and speed.
The captain decided to make an emergency landing at the military airfield at Pervomaiski, 4.5 km north-west of Alma-Ata Airport but the aircraft hit a building, several trees and two telegraph poles.
The aircraft crash-landed wheels-up and ran into another building.
The causes of the disaster were:
1) Burnout of the air self-start valve of the 10th cylinder of the left engine due to poor maintenance, mistaken by the crew for a fire in the engine and leading to a single-engine flight at low altitude.
2) When performing a single-engine flight, the PIC made gross mistakes in the piloting technique:
a) made a turn with a roll of 5 ° to an inoperative motor at a speed of 180-170 km / h at an altitude of 80-70 m;
b) alternately gave afterburner to the right engine in the process of turning, which significantly increased the plane's slip with a roll on the inoperative engine and led to a loss of altitude and speed.
The pilot's gross errors in piloting technique were aided by the fact that the co-pilot was in the left seat. The PIC has not been tested in piloting from the right seat since September 1952.
Contributing reasons:
1) poor organization and condition of aircraft maintenance
2) unsatisfactory training of crews for single-engine flight and poor training of crews for flights in 151 AO.
3) poor discipline of the flight and technical personnel in the airport Alma-Ata.
| Status: | |
| Datum: | zondag 5 december 1954 |
| Tijd: | 20:55 |
| Type: | Ilyushin Il-12P |
| Luchtvaartmaatschappij: | Aeroflot, Kazakstan Civil Aviation Directorate |
| Registratie: | CCCP-L1320 |
| Constructienummer: | 30126 |
| Bouwjaar: | 1947 |
| Aantal vlieguren: | 4645 |
| Bemanning: | slachtoffers: 1 / inzittenden: 5 |
| Passagiers: | slachtoffers: 0 / inzittenden: 14 |
| Totaal: | slachtoffers: 1 / inzittenden: 19 |
| Schade: | Afgeschreven |
| Gevolgen: | Written off (damaged beyond repair) |
| Plaats: | 4,5 km (2.8 mijl) NW of Alma-Ata ( Kazachstan)
|
| Fase: | Nadering (APR) |
| Soort vlucht: | Binnenlandse lijnvlucht |
| Vliegveld van vertrek: | Alma-Ata Airport (ALA/UAAA), Kazachstan |
| Karaganda Airport (KGF/UAKK), Kazachstan | |
| Vluchtnummer: | 98 |
Shortly after takeoff from Alma-Ata on the first leg of a flight to Moscow, the left engine developed a malfunction. The aircraft reached a height of 100 m before it began losing height and speed.
The captain decided to make an emergency landing at the military airfield at Pervomaiski, 4.5 km north-west of Alma-Ata Airport but the aircraft hit a building, several trees and two telegraph poles.
The aircraft crash-landed wheels-up and ran into another building.
Probable Cause:
The causes of the disaster were:
1) Burnout of the air self-start valve of the 10th cylinder of the left engine due to poor maintenance, mistaken by the crew for a fire in the engine and leading to a single-engine flight at low altitude.
2) When performing a single-engine flight, the PIC made gross mistakes in the piloting technique:
a) made a turn with a roll of 5 ° to an inoperative motor at a speed of 180-170 km / h at an altitude of 80-70 m;
b) alternately gave afterburner to the right engine in the process of turning, which significantly increased the plane's slip with a roll on the inoperative engine and led to a loss of altitude and speed.
The pilot's gross errors in piloting technique were aided by the fact that the co-pilot was in the left seat. The PIC has not been tested in piloting from the right seat since September 1952.
Contributing reasons:
1) poor organization and condition of aircraft maintenance
2) unsatisfactory training of crews for single-engine flight and poor training of crews for flights in 151 AO.
3) poor discipline of the flight and technical personnel in the airport Alma-Ata.
Bronnen:
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Kaart
Deze kaart geeft het vliegveld van vetrek weer en de geplande bestemming van de vlucht. De lijn tussen de vliegvelden geeft niet de exacte vliegroute weer.
De afstand tussen Alma-Ata Airport en Karaganda Airport bedraagt 752 km (470 miles).
Accident location: Approximate; accuracy within a few kilometers.
De afstand tussen Alma-Ata Airport en Karaganda Airport bedraagt 752 km (470 miles).
Accident location: Approximate; accuracy within a few 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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