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A.3 Weight
The weight of the IMP2B (level 4/5) is approximately 280 g.
A.4 Reliability (MTBF)
The following table shows the predicted values for reliability as Mean Time Between
Failures (MTBF) and failures per million hours (fpmh).
Table A-4 Reliability (MTBF)
Environment
Ground benign 30°c
Ground fixed 40°c
Ground mobile 45°c
Naval sheltered 40°c
Naval unsheltered 45°c
Airborne inhabited cargo 55°c
Airborne inhabited fighter 55°c
Airborne uninhabited cargo 70°c
Airborne uninhabited fighter 70°c
Airborne rotary wing 55°c
Space flight 30°c
Missile flight 45°c
Missile launch 55°c
The predictions are carried out using MIL-HDBK-217F Notices 1 and 2, parts count
method. To complement the 217 failure rates, some manufacturers' data is included
where appropriate; πQ values have been modified according to industry practice.
These failure rates take no account of user-fitted PMCs.
50 IMP2B 3U cPCI Single Board Computer
Fail Rate
MTBF
(Failures Per Million Hours)
(Hours)
2.37666
420 758
6.45114
155 011
13.31882
75 082
10.98314
91 049
20.33436
49 178
14.58733
68 553
18.52974
53 967
27.58463
36 252
40.27936
24 827
29.85988
33 490
2.17541
459 684
35.67331
28 032
84.5206
11 831
Publication No. IMP2B-0HH/5
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