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Crash of a Tupolev TU-134 in Gabare: 73 killed

Date & Time: Mar 16, 1978 at 1300 LT
Type of aircraft:
Operator:
Registration:
LZ-TUB
Flight Phase:
Survivors:
No
Schedule:
Sofia - Warsaw
MSN:
8 35 05 01
YOM:
1968
Location:
Country:
Region:
Crew on board:
7
Crew fatalities:
Pax on board:
66
Pax fatalities:
Other fatalities:
Total fatalities:
73
Circumstances:
After takeoff from Sofia-Vrazhdebna Airport, the crew informed ATC about an unexpected situation and was cleared to return for an emergency landing. Control was lost from an altitude of 4,900 meters and the aircraft entered a spin and crashed in an open field located near the village of Gabare. The aircraft was totally destroyed and all 73 occupants were killed.

Crash of a Tupolev TU-154A near Al Bayda: 59 killed

Date & Time: Dec 2, 1977
Type of aircraft:
Operator:
Registration:
LZ-BTN
Survivors:
Yes
Site:
Schedule:
Mecca - Benghazi - Tripoli
MSN:
74A054
YOM:
1974
Country:
Region:
Crew on board:
6
Crew fatalities:
Pax on board:
159
Pax fatalities:
Other fatalities:
Total fatalities:
59
Aircraft flight hours:
3700
Circumstances:
The aircraft was completing a charter flight from Mecca to Tripoli with an intermediate stop in Benghazi, carrying Libyan pilgrims flying back home. While descending to Benghazi Airport, the crew was instructed by ATC to divert to Al Bayda as the airport was closed due to foggy conditions. In the area of Al Bayda, the crew was unable to locate the airport due to fog and completed several circuits when the airplane ran out of fuel. The pilot-in-command attempted an emergency landing in a desert area located few km from Al Bayda Airport when the aircraft crashed. 59 passengers were killed while 46 others occupants were injured and 60 escaped uninjured.
Probable cause:
Forced landing following a fuel exhaustion.

Crash of an Antonov AN-1B2 in Kufra

Date & Time: Dec 15, 1975
Type of aircraft:
Operator:
Registration:
LZ-BAA
Flight Type:
Survivors:
Yes
Schedule:
Sofia - Al-Koufrah
MSN:
8 3 460 01
YOM:
1968
Country:
Region:
Crew on board:
5
Crew fatalities:
Pax on board:
0
Pax fatalities:
Other fatalities:
Total fatalities:
0
Circumstances:
For unknown reason, the four engine aircraft landed hard. After touchdown, it was unable to stop within the remaining distance, overran and came to rest. All five crew members escaped uninjured while the aircraft was damaged beyond repair. The exact date remains unknown but the accident occurred during December 1975.

Crash of an Antonov AN-24B in Sofia: 3 killed

Date & Time: Nov 22, 1975
Type of aircraft:
Operator:
Registration:
LZ-ANA
Flight Phase:
Survivors:
Yes
Schedule:
Sofia - Varna
MSN:
67302708
YOM:
1966
Country:
Region:
Crew on board:
4
Crew fatalities:
Pax on board:
42
Pax fatalities:
Other fatalities:
Total fatalities:
3
Circumstances:
While parked on apron at Sofia-Vrazhdebna Airport, the airplane was deiced and the snow was removed before the crew was cleared to taxi to runway 10 for takeoff. However, the runway was closed for snow removal. When this was done, the crew was cleared for takeoff and just after liftoff from runway 10, the airplane encountered difficulties to gain height, stalled and crashed on a bank of the Iskar River located by the airport. The copilot was killed and two passengers drowned. All other occupants were rescued, some of them were injured.
Probable cause:
The hold over time (HOT) between the deicing time and the takeoff time was too long and a significant amount of snow accumulated on the fuselage, wings and all critical surfaces. In such conditions, the aircraft was unable to take off. The crew failed to request a second deicing.

Crash of an Ilyushin II-18V in Moscow: 25 killed

Date & Time: Mar 3, 1973 at 1245 LT
Type of aircraft:
Operator:
Registration:
LZ-BEM
Survivors:
No
Schedule:
Sofia - Moscow
MSN:
182 0056 02
YOM:
1962
Flight number:
LZ307
Country:
Region:
Crew on board:
8
Crew fatalities:
Pax on board:
17
Pax fatalities:
Other fatalities:
Total fatalities:
25
Circumstances:
During an approach to Moscow-Sheremetyevo Airport in marginal weather conditions, the crew initiated a go-around for unknown reason. During the second approach, at a distance of 5 km from the runway 07 threshold, the crew was informed by ATC that his position was 15 meters below the glide. Shortly later, the airplane nosed down then crashed in a huge explosion 4,330 meters short of runway. The aircraft disintegrated on impact and all 25 occupants were killed.
Probable cause:
The commission considered that the most probable cause of the accident was an adverse combination of the following factors:
- Icing of the stabilizer (probably due to lack of heating in the leading edge),
- A pitch manoeuvre executed to correct a deviation from the glide path which resulted in a g-loading of 0,6 - 0,5,
- Extension of the flaps to the full landing setting, which had the effect of degrading the airflow over the lower surface of the stabilizer and, consequently, of producing loads on the control column which promoted a further increase in the negative g-loading and prevented recovery of the aircraft from the developing nosedive.
Owing the destruction of the aircraft it was not possible to check the actual functioning of the stabilizer deicing system.
Final Report:

Crash of an Ilyushin II-14 near Smolyan: 35 killed

Date & Time: Nov 4, 1972 at 2002 LT
Type of aircraft:
Operator:
Registration:
LZ-ILA
Survivors:
No
Site:
Schedule:
Burgas - Sofia
MSN:
1460 010 46
YOM:
1956
Location:
Country:
Region:
Crew on board:
4
Crew fatalities:
Pax on board:
31
Pax fatalities:
Other fatalities:
Total fatalities:
35
Circumstances:
During the preflight briefing, the crew was informed about poor weather conditions in Sofia and that the visibility was below minima. The airplane departed Burgas Airport at 1901LT and en route, the captain decided to divert to Plovdiv where weather conditions were considered as better. First radio contact with approach control in Plovdiv was established at 1950LT and the crew was cleared to descent. Twelve minutes later, while descending by night and limited visibility, the airplane struck the slope of a mountain located in the Rhodopes Mountain Range, near the city Smolyan. The wreckage was found few hours later about 56 km southwest of Plovdiv Airport. All 35 occupants have been killed.
Probable cause:
It was determined that the first radio contact was established with a civilian controller at 1950LT. Four minutes later, this controller was relieved by a military controller who cleared the crew to descent without knowing the exact position of the airplane that descended below the minimum descent altitude. The lack of visibility was considered as a contributing factor.

Crash of an Ilyushin II-18V in Sofia: 28 killed

Date & Time: Dec 21, 1971 at 2332 LT
Type of aircraft:
Operator:
Registration:
LZ-BES
Flight Phase:
Survivors:
Yes
Schedule:
Sofia - Algiers
MSN:
185 0081 04
YOM:
1965
Country:
Region:
Crew on board:
11
Crew fatalities:
Pax on board:
62
Pax fatalities:
Other fatalities:
Total fatalities:
28
Circumstances:
Just after liftoff, while climbing by night to a height of 8 meters, the airplane banked left, causing the left wing to struck the runway surface. Out of control, the airplane crashed in flames in a grassy area located on the left side of the runway. Among the debris scattered on a distance of 400 meters, 45 injured people were evacuated while 28 others were killed, among them two crew members and the Bulgarian singer Pacha Hristova who was travelling to Algeria with members of the Bulgarian folklorik band 'Aura'.
Probable cause:
It was determined that the airplane was just returning into service following ground maintenance. For unknown reason, technicians failed to comply with maintenance procedure and it was determined that the aileron control cables were not properly connected.

Crash of an Ilyushin II-18D in Zurich: 45 killed

Date & Time: Jan 18, 1971 at 1549 LT
Type of aircraft:
Operator:
Registration:
LZ-BED
Survivors:
Yes
Schedule:
Paris - Sofia
MSN:
186 0090 02
YOM:
1966
Flight number:
LZ130
Country:
Region:
Crew on board:
8
Crew fatalities:
Pax on board:
39
Pax fatalities:
Other fatalities:
Total fatalities:
45
Captain / Total flying hours:
8444
Captain / Total hours on type:
3460.00
Copilot / Total flying hours:
9932
Copilot / Total hours on type:
3627
Aircraft flight hours:
8622
Aircraft flight cycles:
3136
Circumstances:
In the afternoon, the airplane departed Paris on flight LZ130 to Sofia, carrying 39 passengers and a crew of eight. While cruising at its assigned altitude vertical to Luxeuil VOR, the captain requested to ATC the permission to divert to Zurich-Kloten Airport. The reason for this rerouting was unknown. The crew was cleared to change his route and continued over south of West Germany before starting a descent to Zurich. The approach to runway 16 at Zurich-Kloten was initiated in poor weather conditions with fog reducing the horizontal visibility to 600 meters and the vertical visibility to 60 meters. On final, the left main gear and the left wing tip struck the ground. The airplane gain a little height then struck the ground, lost its four engines and crashed in flames about 700 meters short of runway threshold, slightly out from the approach path. The aircraft was totally destroyed by impact forces and a post crash fire and only two occupants survived the accident, the captain and a boy aged 12. All 45 other occupants were killed. The occupants were respectively 14 West German, 12 Bulgarian (among them 8 crew members), 9 French, 4 Syrians, 2 Lebanese, one Brazilian, one Dutch, one Argentinian, one Austrian, one Finnish and one British.
Probable cause:
The reason why the crew wanted to divert to Zurich-Kloten Airport could not be determined. Nevertheless, it was determined that during an ILS approach to runway 16 in thick fog, the crew neglected several published procedures which led the aircraft to pass below the minimum descent altitude and the approach path. The lack of visibility due to fog was considered as a contributing factor as the crew was unable to establish a visual contact with the ground and the runway. The last technical revision (50 hours) was completed two days prior to the accident, the 600 hours check on December 2, 1970 and the big revision (check C) was completed on May 31, 1969. At the time of the accident, the airplane was considered as airworthy and no technical anomalies was reported. The eight crew members were respectively a captain, a copilot, a navigator, a flight engineer, a radio navigator, an aspirant radio navigator, one steward and one stewardess.