idling engine operation

engine idling speed adjusting screw

maintenance idling (periodic running of engine for maintenance purposes)

engine capacity / engine power, engine output

idling

idling performance

idling tube

warming-up by idling

uniform idling

fast idling

idling carburetor system

idling valve

acceleration from the normal [tactical) idling speed

clandestine operation; covert operation

humanitarian operation; humanitarian relief operation (HUMRO)

PZ operation (pick-up zone operation)

noncombatant evacuation operation (NEO); non-combat evacuation operation

underwater operation of engine

cut-off engine operation

engine run-up operation

rough engine operation

reaction engine / motor (jet engine)

rotary engine (Wankel engine)

engine ground run / engine test

engine oil reservoir / engine oil tank

aeromobile operation

African Union / United Nations Hybrid operation in Darfur (UNAMID)

air defense operation

air logistic support operation

air operation

airborne and amphibious operation

airborne assault operation

airborne/ amphibious operation