MIL-STD-690D
w/ CHANGE 1
* TABLE IV. FRSP-10.
FR level symbol |
Qualified FR level 1/ |
Qualification maintenance period (in months) |
Cumulative unit hours in millions (c = number of failures permitted) |
||||||||||||
A |
B |
C |
c=0 |
c=1 |
c=2 |
c=3 |
c=4 |
c=5 |
c=6 |
c=7 |
c=8 |
c=9 |
c=10 |
||
L M P R or U 4/ S or V 4/ |
2/ 1.0 0.1 0.01 0.001 |
3 3 6 9 12 |
6 6 9 12 15 |
3/ 3/ 6 24 |
10.5 5/ |
.0532 .532 5.32 53.2 |
("M" .110 1.10 11.0 110 |
row .175 1.75 17.5 175 |
divided .243 2.43 24.3 243 |
by .315 3.15 31.5 315 |
"L") .389 3.89 38.9 389 |
.467 4.67 46.7 467 |
.544 5.44 54.4 544 |
.623 6.23 62.3 623 |
.701 7.01 70.1 701 |
1/ Expressed in %/1,000 hours. For FR level expressed in terms other than %/1,000 hour, see 4.1c and 4.1d.
2/ Where a FR level greater than 1.0 percent is required, level "L" shall be specified and the cumulative unit hours computed as shown.
3/ Each lot.
4/ See 4.1a.
5/ Applicable to FR level "S" and "V" only.
TABLE V. True failure rates for FRSP-10 (prepared for 1 percent per 1,000 hours FR level).
Number of failures permitted |
True failure rate required to maintain qualification 19 times out of 20 |
True failure rate which would cause disqualification 9 times out of 10 |
( c ) 0 1 2 3 4 5 6 7 8 9 10 |
(%/1,000 hrs) 0.49 0.67 0.74 0.78 0.81 0.83 0.84 0.85 0.86 0.87 0.88 |
(%/1,000 hrs) 21.8 7.3 4.8 3.8 3.3 2.9 2.7 2.5 2.4 2.3 2.2 |
* NOTE: For other than M (1 percent) FR level, divide above FR values by
10 for P (0.1 percent) level; by 100 for R and U (0.01 percent); or by 1,000 for S and V (0.001 percent) level (see 4.1a).
16
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business