Frame time – Symbol tf, time required to scan one frame in radar search. Framing pulses – Transmitted in TV/video, SSR, IFF, ATCRBS and similar systems to synchronize transmitted and received timebases.
Frameless canopy – Single blown transparency in metal peripheral frame. Frame relay – New standard for handling small packets of high-speed burst data over WANs.
1 In photography, single exposure within continuous sequence. 2 Transverse structural member of fuselage, hull, nacelle or pod, following its periphery. 3 Of engine, structural transverse diaphragm carrying main shaft bearing. 4 Picture area scanned in radar, TV, video or CRT (US = field).
Fragmentary order – Abbreviated form of operation order which eliminates need for restating information contained in basic operation order (DoD). Usually a daily supplement to SOOs governing conduct of specific mission. Fragmentation bomb – Charge contained in heavy case designed to hurl optimum fragments on bursting.
Fractional ownership – Aircraft, usually bizjet, is registered to prearranged [usually small] group, each having equal allocation of annual flight time. Today there are many variations. Fractionation – Use of large numbers of small (nuclear) warheads, esp. in counterforce attack; hence to fractionate.
Fractional distillation – Heating crude petroleum to moderate temperature at atmospheric pressure and condensing different fractions separately. Fractional orbit bombardment system – ICBM initially launched into low Earth orbit, enabling warhead[s] to arrive on target from any direction.
Air-combat numeral code, usually: 1, SARH mssile selected; 2, IR missile selected; 3, guns; 4, fired outside parameters to distract enemy. There is an alternative, used to report method used to dispose of adversary: 1, radar, AAM; 2, IR AAM; 3, gun(s); 4, made opponent fly into ground.
Special form of split flap that moves at first rearwards and then downwards along tracks, thus producing initial large increase in lift and at full deflection giving high lift and drag for landing.
Four-way cross – Airshow manoeuvre in which two pairs of aircraft roll wings vertical to pass in a close head-on. Fox away – Verbal code: “AAM has been fired or released” (DoD).
Jet engine for VTOL with two front fan nozzles and two rear core-jet nozzles, which in VTOL mode provides lift from four jets in rectangular pattern; or an aircraft equipped with such an engine.