USAF ILA Handbook - ACC Practice Center - Defense Acquisition ...

maintenance- and supply-response
time, administrative delays and time
for other activities that result in Not
Mission Capable status
spares will normally be required to be stored locally
to meet availability requirements.
B-1. RAM Relationships to Sustainment Elements (continued)
RAM Measures
Maintenance Man-hours per Life
Unit (MMH/LU) is used by the
Major Commands (MAJCOMs) to
measure the total number of direct
maintenance personnel needed for a
specific Operational Tempo
(OPTEMPO)
System Analyses [includes Failure
Modes, Effects and Criticality
Analysis (FMECA), Single Point
Failure Analysis (SPFA) and Fault
Tree Analysis (FTA)] from the
system level to the lowest part level
are performed as the design
progresses to assess the design
robustness and overall reliability.
These analyses are built on earlier
design analyses and engineering
measurement analyses to determine
system reliability via unit under test.
Worst-Case Analyses are performed
to identify tolerance stack-up as well
as drift in circuit parameters.
Calibration and measurement systems
are included in these analyses.
Sneak Circuit Analysis is conducted
to identify unintended product
operating modes and performed as a
minimum on critical circuits, circuits
that perform frequent switching
functions, and areas of safety
concern.
Relationship to Sustainment Elements
• Manpower: Manpower projections to support
specified operating and maintenance concepts for
on-equipment and off-equipment maintenance.
• Maintenance: These analyses assist in determining
the failure effects which drive the trouble-shooting
criteria, strategy and equipment for fault detection
of failure modes.
• Supply: These analyses identify critical components
and their failure modes so they can be adequately
spared to optimize repair time and corrective action.
• Data Management: These analyses will assist in
determining the troubleshooting description,
requirements and diagnostics in the technical
documentation by identifying failures and their
effects.
• Systems Engineering (Manpower, Personnel and
Training): These analyses may identify failure
modes that can create ESOH hazards.
• Funding: Design changes or other corrective actions
resulting from these analyses may reduce
manufacturing, operation and maintenance costs. If
these analyses are not performed, design
deficiencies may not be identified until later during
deployment, negatively affecting the program’s
sustainment cost.
• Maintenance: Assists in determining the
troubleshooting and diagnostic procedures by
identifying potential sneak circuits and failure items
• Systems Engineering (Supportability): These
analyses may identify failure modes that create
ESOH hazards.
• Funding: These results are similar to the funding
impacts found in Systems Analyses reliability
measures.
Version 1: Jan 2006 29
Air Force Independent Logistics Assessment Handbook