SOYUZ 2.1a (14A14A) - Vehicle use: Soyuz, Progress, Satellite
Russian orbital launch vehicle. The Soyuz U launch vehicle is derived from the Soviet R-7 intercontinental ballistic missile and produced by the Progress Rocket Space Center. It is comprised of four strap-on boosters (stage 1), a central core stage (stage 2), and an upper stage (stage 3). The Soyuz 2.1a is the latest variant of the launcher and uses improved engines, a digital telemetry system, a digital flight computer, and a modified third stage. The Soyuz 2.1a variant is currently used to launch the Progress resupply vehicle to the ISS.
source: http://www.arianespace.com/vehicle/soyuz/
Variant
2.1a
Launches
39
Failures
1
Realized
0.97
Predicted
0.95
50
51
53
52
55
56
54
57
58
59
60
61
62
64
63
65
67
66
69
68
71
72
70
73
74
75
76
79
77
78
81
80
83
82
85
84
86
87
88
89
90
91
92
93
95
94
96
97
99
98
01
00
02
03
04
05
06
07
09
08
11
10
13
12
15
14
17
16
18
19
20
21
22
23
24
4/28/2015 - SOYUZ 2.1a
STRUCTURAL FAILURE
Launch of Progress M-27M
Progress M-27M was lost at near the time of third stage-Progress staging. The Russian Commission determined a “design peculiarity in the joint use of the spaceship and the rocket related to the frequency-dynamic characteristics of the linkage between the spaceship and the rocket’s third stage is the cause for the damage done to the spaceship as a result of the emergency separation of the carrier rocket’s third stage and the transport spacecraft.” The interface was redesigned.
SOURCES:
Russian News Agency TASS article
1.00
0.80
1.00
0.67
0.96
0.93
0.97
0.95
0.97
0.94
0.97
0.95
1.00
0.94
0.96
0.92
1.00
0.92
0.96
0.93
1.00
0.93
1.00
0.95
1.00
0.88
1.00
0.83
Realized Rate
Predicted Rate