COMMENT: Each licence has its own specific requirements and privileges. In the UK, one of the fundamental differences between a Private Pilot’s Licence and other types of licence is that the holder of a PPL is not allowed to fly for ‘hire or reward’, i.e. the pilot cannot receive payment for flying.
licence holder /la.s(.)ns h.υld./ noun 1. a person who has a licence 2. a leather case, etc., in which to keep the licence document
license /la.s(.)ns/ noun US same as licence . verb to give somebody a licence or official permission to do or to own something
lie /la./ verb 1. to be in a flat position, often horizontal . Seat rails are attached to the floor beams and lie level with the flooring. 2. to be situated . Great circles are represented by curves which lie on the polar side of the rhumb line. (NOTE: Care should be taken with the verbs to lie, as defined here: lie – lay – lain; to lie meaning ‘not to tell the truth’: lie – lied – lied and lay, meaning
‘to put down’ as in ‘lay the book on the table’: lay – laid – laid.) life jacket /la.f dk.t/ noun an
inflatable device, sometimes resem-bling a sleeveless jacket, to keep a per-son afloat in water . Pull down the tog-gles to inflate the life jacket.
life raft /la.f rɑft/ noun a small boat-like vessel for use on an emergency over water
life vest /la.f vest/ noun same as life jacket . You will find a life vest under your seat.
lift /l.ft/ noun 1. a component of the total aerodynamic force acting on an aerofoil which causes an aeroplane to fly . In level flight, a lift force equal to the weight must be produced. . The pilot can achieve maximum lift by pull-ing hard back on the controls. 2. an electrically operated machine for mov-ing people or goods between the floors of a building (NOTE: The US English is elevator.) . verb to move to a higher position . A foot-pound is the ability to lift a one pound weight a distance of one foot.
COMMENT: Bernoulli’s principle states that if the speed of a fluid increases, its pressure decreases; if its speed decreases, its pressure increases. Wings are shaped so that the high-speed flow of air that passes over the curved upper surface results in a decrease in pressure. Lift is created because of the pressure differential between upper and lower surfaces of the wing. Lift is also created because the angle of attack allows the airflow to strike the underside of the wing. Daniel Bernoulli (1700–82) was a Swiss scientist.
light /la.t/ noun 1. brightness pro-duced by the sun, the moon, a lamp, etc.
2. electromagnetic radiation which can be sensed by the eyes . artificial light light made by using electrical, gas, etc., power 3. a source of light such as a lamp
. Switch off the navigation lights. .
adjective 1. without much weight, not heavy . Aluminium is a light metal. 2. of little force or requiring little force . a light wind a gentle wind . light con-trols flying controls which do not need much pilot effort to move them 3. of lit-
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