BY ORDER OF THE AIR FORCE PAMPHLET 91-215 SECRETARY ...
BY ORDER OF THE AIR FORCE PAMPHLET 91-215 SECRETARY ... BY ORDER OF THE AIR FORCE PAMPHLET 91-215 SECRETARY ...
A2.C.6.6. RESOURCES. The best source of more detailed information on the FMEA is the supporting safety office. A2.C.6.7. COMMENTS. None A2.C.6.8. EXAMPLES. A basic example of the FMEA is provided at Figure A2.42. Figure A2.42. Example FMEA. Situation: The chief of a major small arms training facility is concerned about the possible impact of the failure of the landline communications system that provides the sole communications capability at the site. The decision is made to do a failure mode and effects analysis. An extract from the resulting FMEA is shown below. Component Function Failure Mode & Cause Failure Effect on Probability Corrective action Higher Item System Landline Comm Cut -natural cause, Comm sys Cease Probable Clear natural obstacles Wire Falling tree, etc. down Fire from around wires Wire Cut - unrelated Comm sys Cease Probable Warn all operations operational activities down Fire Placement of wire Line failure Comm sys Cease Probable Placement of wires Wire down Fire Proper grounding Wire Cut - vandals & Comm sys Cease Unlikely Placement of wires thieves down Fire Area security 92
A2.C.7. THE MULTILINEAR EVENTS SEQUENCING TOOL A2.C.7.1. FORMAL NAME. The multilinear events sequencing tool A2.C.7.2. ALTERNATIVE NAMES. The timeline tool, the sequential time event plot (STEP) A2.C.7.3. PURPOSE. The multilinear events sequencing tool (MES) is a highly specialized hazard ID procedure designed to detect hazards arising from the time relationship of various operational activities. The MES detects situations in which either the absolute timing of events or the relational timing of events may create risk. For example, an operational planner may have crammed too many events into a single period of time, creating a task overload problem for the personnel involved. Alternatively, the MES may reveal that two or more events in an operational plan conflict because a person or piece of equipment is required for both but obviously can’t be in two places at once. The MES can be used as a hazard ID tool or as a mishap investigation tool. A2.C.7.4. APPLICATION. The MES is usually considered a professional loss prevention level tool, but the MES worksheet actually simplifies the process to the point that a motivated individual can effectively use the tool. The MES should be used any time that risk levels are significant and when timing and/or time relationships may be a source of risk. It is almost an essential tool when the time relationships are relatively complex. A2.C.7.5. METHOD. The MES is accomplished using a worksheet similar to the one illustrated at Figure A2.43. The sample worksheet displays the timeline of the operation across the top and the “actors” (people or things) down the left side. Notice that in some operations the timeline may literally be broken down in seconds. The flow of events is then displayed on the worksheet showing the relationship between the actors on a time basis. Once the operation is displayed on the worksheet, the sources of risk will be evident as the flow is examined. Figure A2.43. Multi-linear Events Sequencing Form. Timeline (Time units in seconds or minutes as needed) Actors (People or things involved in the process) A2.C.7.6. RESOURCES. The best sources for more detailed information on the MES is the local safety staff. As with the other more advanced tools, using the MES will normally involve consultation with a safety professional familiar with its application. A2.C.7.7. COMMENTS. The MES is unique in its role of examining the time-risk implications of operations. 93
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A2.C.6.6. RESOURCES. The best source of more detailed information on the FMEA is the supporting<br />
safety office.<br />
A2.C.6.7. COMMENTS. None<br />
A2.C.6.8. EXAMPLES. A basic example of the FMEA is provided at Figure A2.42.<br />
Figure A2.42. Example FMEA.<br />
Situation: The chief of a major small arms training facility is concerned about the possible<br />
impact of the failure of the landline communications system that provides the sole communications<br />
capability at the site. The decision is made to do a failure mode and<br />
effects analysis. An extract from the resulting FMEA is shown below.<br />
Component Function Failure Mode & Cause Failure Effect on Probability Corrective action<br />
Higher Item System<br />
Landline Comm Cut -natural cause, Comm sys Cease Probable Clear natural obstacles<br />
Wire Falling tree, etc. down Fire from around wires<br />
Wire Cut - unrelated Comm sys Cease Probable Warn all operations<br />
operational activities down Fire Placement of wire<br />
Line failure Comm sys Cease Probable Placement of wires<br />
Wire down Fire Proper grounding<br />
Wire Cut - vandals & Comm sys Cease Unlikely Placement of wires<br />
thieves down Fire Area security<br />
92
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