RCM Decision Logic.pdf

3 No

Is there an intolerable risk that the effects of this failure mode could breach a known environmental standard or regulation?

Yes

Yes

Yes

Scheduled discard or restoration task

No scheduled maintenance

17 Yes

Failure-finding task

Re-design compulsory

Scheduled on-condition task 19

Is a scheduled restoration task or scheduled discard task technically feasible and worth doing?

Yes

Scheduled discard or restoration task

Is a scheduled failure-finding task technically feasible and worth doing?

Re-design compulsory

20 Yes

Yes

Scheduled on-condition task

Is a scheduled restoration task or scheduled discard task technically feasible and worth doing?

22

Yes

Scheduled discard or restoration task

Is a scheduled failure-finding task technically feasible and worth doing?

23 Yes

Failure-finding task

No scheduled maintenance

Failure-finding task

Re-design may be desirable

EVIDENT SAFETY and ENVIRONMENTAL CONSEQUENCES The failure management policy must reduce the risk of the failure to a tolerable level

EVIDENT OPERATIONAL CONSEQUENCES Over a period of time, the failure management policy must cost less than the operational consequences plus repair cost

EFFECTIVENESS CRITERIA

EVIDENT NON-OPERATIONAL CONSEQUENCES Over a period of time, the failure management policy must cost less than the cost of repairing the failure

HIDDEN SAFETY and ENVIRONMENTAL CONSEQUENCES The failure management policy must reduce the risk of the multiple failure to a tolerable level

Is a scheduled on-condition task technically feasible and worth doing?

Is a scheduled restoration task or scheduled discard task technically feasible and worth doing?

Is a scheduled failure-finding task technically feasible and worth doing? No

Re-design may be desirable

Yes

21

Is a scheduled on-condition task technically feasible and worth doing?

No

Re-design may be desirable

No

No

Scheduled discard or restoration task

16

Is a scheduled restoration task or scheduled discard task technically feasible and worth doing?

18

Is a scheduled on-condition task technically feasible and worth doing?

No

No scheduled maintenance

14

Does the failure mode have a direct adverse effect on operational capability?

No

Is a scheduled restoration task or scheduled discard task technically feasible and worth doing?

Scheduled on-condition task

No

No

Scheduled on-condition task

Yes

7

Yes

Is a combination of tasks technically feasible and worth doing?

No

No

Scheduled discard or restoration task

Is there an intolerable risk that the multiple failure could breach a known environmental standard or regulation?

No

Yes

6

s Ye

12

No

Combination of tasks

Is there an intolerable risk that the multiple failure could injure or kill someone?

15

Is a scheduled on-condition task technically feasible and worth doing?

No

Yes

Scheduled on-condition task

13

No

10

Yes

Is a scheduled restoration task or scheduled discard task technically feasible and worth doing?

No

Scheduled discard or restoration task

No

Is a scheduled on-condition task technically feasible and worth doing?

No

Yes

Is a scheduled on-condition task technically feasible and worth doing?

No

9

5 Does the failure mode have a direct adverse effect on operational capability?

Yes

Yes

Scheduled on-condition task

No

11

8 Yes

4

SAE JA1012 Issued Jan 2002

Yes

Is there an intolerable risk that the effects of this failure mode could injure or kill someone?

Ye s

2

An RCM Decision Algorithm

No

No

Yes

Will the loss of function caused by this failure mode on its own become evident to the operating crew under normal circumstances?

No

1

HIDDEN OPERATIONAL CONSEQUENCES Over a period of time, the failure management policy must reduce the probability of a multiple failure (and associated total costs) to an acceptable minimum

No scheduled maintenance

Re-design may be desirable

HIDDEN NON-OPERATIONAL CONSEQUENCES Over a period of time, the failure management policy must reduce the probability of a multiple failure (and associated total costs) to an acceptable minimum