frequent reserve maintenance period

inactive Reserve (Individual Ready Reserve [IRR])

contingency maintenance / special maintenance

depot maintenance (beyond O and I level activities, performed in an industrial-type facility) / D-level maintenance

maintenance checks / routine maintenance, scheduled tasks

maintenance idling (periodic running of engine for maintenance purposes)

organizational maintenance (O-level) (day-to-day work that standard airfield maintenance groups perform in support of airfield operations)

routine maintenance / scheduled tasks, maintenance checks

scheduled tasks / routine maintenance, maintenance checks

special maintenance / contingency maintenance

base period

initial period of war

inter-look dormant period (mines)

launch period

monsoon transition period

period of crisis

period of tension

period of threat

practical training period

prior period adjustments

reporting period

savings on prior-period obligations

warmup period

change-over period

concentration period

in the period in which the communications channel has been open

inaction period

heating period of the engine

intake period

induction period

mixing period

representative time period

long-period forecast