Mechanical Failure Rates for Non.Electronic Reliability
237
Table D.3 continued
Upper
2G! 10 6 hr
Lower
Component or part
extreme
mean
extreme
Lines and fittings
7.80
0.02
0.05
Motors
7.5
0.625
0.15
Motors, blower
5.5
0.2
0.05
Motors, electrical
0.58
0.3
0.11
Motors, hydraulic
7.15
4.3
1.45
Motors, servo
0.35
0.23
0.11
Motors, stepper
0.71
0.37
0.22
Mounts, vibration
1.60
0.875
0.20
Orifices, bleeds fixed
2.11
0.15
0.01
Orifices, variable area
3.71
0.55
0.045
Pins, grooved
0.10
0.025
0.006
Pins, guide
2.60
1.625
0.65
Pistons, hydraulic
0.35
0.2
0.08
Pumps
24.3
13.5
2.7
Pumps, engine-driven
31.3
13.5
3.33
Pumps, electric drive
27.4
13.5
2.9
Pumps, hydraulic drive
45.0
14.0
6.4
Pumps, pneumatic driven
47.0
14.7
6.9
Pumps, vacuum
16.1
9.0
1.9
Regulators
5.54
2.14
0.70
Regulators, flow and pressure
5.54
2.14
0.70
Regulators, helium
5.26
2.03
0.65
Regulators, liquid oxygen
7.78
3.00
0.96
Regulators, pneumatic
6.21
2.40
0.77
Relays, general-purpose
0.48/cs
0.25/cs
0.10/cs
Resistors, carbon deposit
0.57
0.25
0.11
Resistors, fixed
0.07
0.03
0.01
Resistors, precision tapped
0.292
0.125
0.041
Resistors, WW, accurate
0.191
0.091
0.052
Resolvers
0.07
0.04
0.02
Rheostats
0.19
0.13
0.07
Seals, rotating
1.12
0.7
0.25
Seals, sliding
0.92
0.3
0.11
Sensors, altitude
7.50
3.397
1.67
Sensors, beta-ray
21.30
14.00
6.70
Sensors, liquid-level
3.73
2.6
1.47
Sensors, optical
6.66
4.7
2.70
Sensors, pressure
6.6
3.5
1.7
Sensors, temperature
6.4
3.3
1.5
Servos
3.4
2.0
1.1
Shafts
0.62
0.35
0.15