MIL-HDBK-502 - Barringer and Associates, Inc.

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MIL-HDBK-502: ACQUISITIONALOGISTICS6.4.2 Supportability Design FactorsDirect maintenance:The following figures (6-5 and 6-6) provide good examples of expressingsupportability requirements in measurable terms and building supportabilityrequirements into the design.F-18 MAINTENANCE REQUIREMENTSMan-hours/flight hour 11.02Operational availability 80%Turn around time (max. 3 men)15 min.Mean time to repair1 hr. 46 min.Fault isolate time90% in 5 min.Fault isolate time100% in 10 min.Engine change21 min. (4 men)Radar remove and replace21 min. (2 men)Figure 6-5. Maintenance RequirementsWhat happens when the logistician isn’t involved in the design process?Logistic problems get built into the design. For example, when the F-4 wasdesigned, the radio was placed to the left of the rear seat bucket under theair data computer. This placement made good sense from the design pointof view because it kept a heavy object forward. The radio was relativelyreliable, and routine maintenance could be performed in ten minutes or so.The problem was that in order to get to the radio the ejection seat had tobe dearmed and the seat bucket and computer removed—and then theprocess had to be completed in reverse after the radio maintenance hadbeen completed. The ten minute job had become a four or five hour job.Even worse was the possibility of maintenance-induced failure of thecomputer when it was reinstalled, which would render the aircraft nonflyable.6-19
MIL-HDBK-502: ACQUISITIONALOGISTICSSUPPORTABILTY RELATED DESIGN FACTORFOR THE F-16Terms:Range/Value:Weapon system reliability .90 - .92Mean time between maintenance (inherent) 4.0 - 5.0 hrs.Mean time between maintenance (total)1.6 - 2.0 hrs.Fix rate60% in 2 hrs.75% in 4 hrs.85% in 8 hrs.Total not-mission-capable rate maintenance rate 8%Total not-mission-capable supply rate 2%Sortie generation rateclassified (see req. doc.)Integrated combat turn around time15 min.Primary authorized aircraft airlift support6-8 C-141B equiv.Direct maintenance personnel7 to 12 AFSCsReduced number of Air Force Specialty Codes 4 to 6 AFSCsFigure 6-6. Designing for SupportSupportability design factors include the following categories:• System reliability (mean time between failures)• System maintainability (mean time to repair)• Maintenance burden (maintenance man-hours per operatinghour)• Built in fault isolation capability (percent successful isolation)• Transportability requirements (identification of conveyances onwhich transportable)Many factors influence supportability decisions. As the Department ofDefense looks more and more toward the commercial marketplace as asource for procuring goods and services for government use, differinggoals and objectives surface.The issue of packaging is a good example of differing military andcommercial goals. In fact, our reliance on military specifications andstandards dates to unsatisfactory packaging provided by contractors duringthe Spanish American War. Today the situation is reversed. Commercialpackaging is designed to protect both the contents and the outside of thepackage. The package is expected to look good on arrival: the companylogo prominently and neatly displayed, the undented container visuallypromising an excellent product within. The military packaging goal is much6-20
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