flap actuating shaft

actuating shaft

crank-actuating shaft

split flap / split-flap

flap slat CTL lever / flap and slat control lever

trailing edge flap (T.E. flap)

propeller shaft (drive shaft)

hollow shaft (of lower coaxial shaft)

actuating fluid pressure

actuating lever

clutch and brake actuating mechanism

valve actuating push rod

valve actuating rocker

feed block slide (feed-block-actuating slide)

firing-lever spindle actuating lever

actuating mechanism

landing gear actuating cylinder

actuating rod

actuating strut

actuating mechanism / actuator

emergency supply actuating valve

dive flap

flap

flap damping

flap plate (of gun shield)

air flap

brake flap

cooling flap

cowl flap

differentially operated flap

double-slotted flap

engine cowl flap

extended flap