COMMENT: The Moroccan aerobatic team ‘La Marche Verte’ perform a formation manoeuvre with three aircraft spinning through multiple rotations while inverted.
spindle /sp.nd(.)l/ noun a pin or bar which rotates or on which something rotates . A cup anemometer has three cups, mounted on a spindle, that are driven by the wind causing the spindle to rotate.
spine /spa.n/ noun the longitudinal central part of an engine . Annular inner and outer air casings form a tun-nel around the spine of the engine.
spinner /sp.n./ noun a cap that fits over the hub of the propeller of an air-craft
spiral /spa.r.l/ adjective winding continuously in circles as it ascends or descends
spiral dive /spa.r.l da.v/ noun a
dangerous uncontrolled turning descent of an aircraft in which rate of descent and speed increase
spline /spla.n/ noun a groove in a shaft for meshing or engaging with another component
split /spl.t/ noun 1. a division 2. a break along a line, especially in wood, plastic or rubber . a split in a tyre . verb
1. to divide . Retractable undercar-riages can be split into three groups. 2. to break along a line . One of the tyres split on impact. (NOTE: splitting – split)
. adjective divided or broken along a line
split bus system /spl.t bs
s.st.m/ noun an electrical system in which there are two separate power generation systems . The parallel sys-tem and the split bus system are both used to distribute electrical power.
spoiler /sp..l./ noun a hinged sur-face on the upper wing which, when opened, decreases lift and increases drag . If a problem occurs in the spoiler system a master caution light illumi-nates.
COMMENT: Spoilers are sometimes called ‘speed brakes’. They are used during the descent prior to landing and immediately after landing to decrease lift and increase braking effect.
sponson /sp.ns.n/ noun an air-filled structure or small wing projecting from the lower hull of a seaplane to keep it steady on water
spontaneous /sp.nte.ni.s/ adjec-tive happening without external cause .
Spontaneous ignition may occur if oxy-gen is allowed to come into contact with oil or grease.
spool /spul/ noun one complete axial-compressor rotor . The single spool compressor consists of one rotor assembly and stators. . verb . to spool down to allow the revolutions of a tur-
spot 216
bofan engine to decrease . to spool up to increase the revolutions per minute of a turbofan engine
spot /sp.t/ noun 1. a special or small place . Charts should be kept in a con-venient spot in the cockpit. 2. a small roundish mark or piece . a spot of oil on a shirt . spot height the height of a par-ticular place, e.g. a mountain peak, marked on a chart
spotlight /sp.tla.t/ noun a powerful, often moveable light which illuminates a small area . A spotlight is mounted on the roof.
spray /spre./ noun 1. a body of liquid in fine drops . The generator is cooled by oil spray delivered by the constant speed drive section. 2. a container that sends out liquid in fine drops . verb to apply or to send out liquid in the form of fine drops . Some engines have the coolant sprayed directly into the com-pressor inlet, but for axial flow com-pressor engines, it is more suitable to spray the coolant into the combustion chamber inlet.
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