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zoom Z 0
zoom 1 Abnormally steep climb trading speed for
height; applies chiefly to majority of aeroplanes whose
T/W ratio is much less than 1 even at near SL; normally a
manoeuvre in low-level display flying.
2 Optimized steep climb by high-performance jet
(which at SL might have T/W greater than 1, and thus
could make sustained climb at 90°) at high altitude,
normally starting at maximum level Mach, trading speed
for height in order to reach exceptional height far above
sustained level ceiling.
3 To enlarge or reduce image of object in TV, video,
camera, etc, using lens of continuously variable focal
length (* lens).
4 In air-combat, unloaded low-alpha climb to gain
maximum height for minimum dissipation of energy.
zoom boundary Limits of flight envelope (in which
ordinate is altitude) attained by zooming (see zoom [2]).
zoom ceiling That attained with a zoom (2).
zoom climb Zoom (1); second word redundant.
zoom domain The extension of the design envelope
above the 1g ceiling which can be reached in a zoom.
Zorflex Actvated-charcoal cloth (CCI).
ZOS Zone of separation.
ZP Zone of protection.
ZPI Zone position indicator radar.
ZPU Hostile AAA using close-range automatic
weapons (US colloq., from a Soviet 14.5 mm AA gun
designation).
ZR 1 Freezing rain.
2 Zenitnaya raketnaya = SAM; K adds system, PVO
has its own entry, SD adds medium-range, V troops
(USSR, R).
Zr Zirconium.
ZrB 2 Zirconium boride.
ZRE Plus suffix numeral, British Mg-Zr alloys.
ZROC Zero rate of climb; hence * speed, that (on back
of drag curve) at which slender delta can just hold height
at full power near SL.
ZSA Zonal safety analysis.
ZST Zone standard time.
ZTA Ceramic comprising tetragonal zirconia in
alumina.
ZTC Zero temperature controller.
ZTDL Zero-thrust descent and landing.
ZTP Zero-thrust point.
ZTV Zone trim valve, governs each zone (7) in controlling
ECS.
Zulu, zulu 1 Phonetic word for Z, thus * time = UTC, *
flightplan = one wherein all times are UTC [previously
GMT].
2 Denotes QRA status (USAF).
3 Airmet advisory: freezing, icing.
ZVEI Zentralverband der Elektrotechnik-Industrie
und Elektronikindustrie [electronics manufacturers;
office D-60596 Frankfurt am Main] (G).
Zwilling Twin or coupled, esp. twin-fuselage (G).
Zyglo NDT process in which part is coated with
penetrant dye, cleaned, coated with powder developer
(which extracts dye from any cracks) and examined in UV
when dye fluoresces.
Zytel Nylon materials which remain flexible at extreme
cryogenic temperatures (registered name).
Z 0 Z-zero, a factor determining buckling characteristics
of fibre-reinforced panels, varying with the ply directions.
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