234
Appendix D
Table D.3 Generic failure-rate
distributions
2a
Upper
2G/106 hr
Lower
Component or part
extreme
mean
extreme
Absorbers, r-f
1.20
0.687
0.028
Accelerometers
7.5
2.8
0.35
Accelerometers, strain gage
21.4
8.0
1.00
Accumulator
19.3
7.2
0.40
Actuators
13.7
5.1
0.35
Actuators, booster servo
33.6
12.5
0.86
Actuators, sustainer servo
33.6
12.5
0.86
Actuators, small utility
9.6
3.6
0.17
Actuators, large utility
18.5
6.9
0.60
Adapters, bore-sight
6.53
2.437
0.01
Adapters, wave-guide
9.31
3.475
0.139
Alternat ors
2.94
0.7
0.033
Antennas
3.52
2.0
0.48
Antenna drives
10.04
5.7
1.36
Attenuators
1.30
0.6
0.15
Base castings
0.70
0.175
0.015
Baffles
1.3
1.0
0.12
Batteries, chargeable
14.29
1.4
0.5
Batteries, one shot
300 cycles
30 cycles
10 cycles
Bearings
1.0
0.5
0.02
Bearings, ball, high-speed heavy-duty
3.53
1.8
0.072
Bearings, ball, low-speed light-duty
1.72
0.875
0.035
Bearings, rotary, sleeve-type
1.0
0.5
0.02
Bearings, rotary, roller
1.0
0.5
0.02
Bearings, translatory, sleeve shaft
0.42
0.21
0.008
Bellows
4.38
2.237
0.090
Bellows, motor in excess of 0.5 in stroke
5.482
2.8
0.113
Bellows, null-type
5.879
3.0
0.121
Blowers
3.57
2.4
0.89
Boards, terminal
1.02
0.0626
0.01
Bolts, explosive
400 cycles
40 cycles
10 cycles
Brackets, bore-sight
0.05
0.0125
0.003
Brackets, mounting
0.05
0.0125
0.003
Brackets, miscellaneous
0.55
0.1375
0.034
Bracket assemblies
7.46
2.1
0.94
Brushes, rotary devices
1.11
0.1
0.04
Bulbs, temperature
3.30
1.0
0.05
Bumpers, ring assembly
0.073
0.0375
0.002
Bumper ring supports (bracket)
2.513
1.2875
0.052
Bushings
0.08
0.05
0.02
Buzzers
1.30
0.60
0.05