01 Airframes

Water-based fire extinguishers are most suitable for use on:

• Combustible metals and fuel.

• Electrical equipment and paper.

• Paper and furnishing fabrics.

• Wheel and brake fires.

It is good practice, when flying over large areas of water, that life jackets:

• Should be carried under the pilots’ seats.

• Are worn, uninflated.

• Should be inspected periodically for leaks.

• Are worn inflated.

Semi-monocoque can be defined as:

• A stressed skin with supported apertures containing an internal structure framework.

• A framework of light-gauge steel tubes welded together to form a space frame of triangular shape.

• A structure with no apertures at all.

• An apertureless structure with load bearing formers being supported by stringers and longerons over a stressed skin.

A true ‘monocoque’ structure:

• Would have bulkheads set in place to separate the different sections of the aircraft.

• Would have a framework consisting of light gauge steel tubes welded together.

• Is sometimes referred to as ‘Strained Skin’ construction.

• Would have no apertures at all.

The type of gas which is stored in the activating cylinder of a life jacket:

• Is extremely toxic and great care should be taken, when topping up the lifejacket, not to breathe any of it in.

• Is Carbon Dioxide.

• Is highly inflammable.

• Is Carbon Monoxide.

A BCF fire extinguisher:

• Gives off highly toxic fumes and should never be used in an enclosed cockpit.

• Is quite safe to use in an enclosed cockpit.

• Is only suitable for wood or fabric fires and is, therefore, of no use in a cockpit.

• Is quite safe to use in an enclosed cockpit if the cockpit is subsequently ventilated.

The component parts of the wing shown in the diagram are:

• Primary Spar, Formers, Stringer

• Front Spar, Secondary Spar, Former

• Front Spar, Formers, Rear Spar

• Stringers, Secondary Spar, Former

A flying control lock:

• Will constrain the control column to its design limits so as not to overstress the airframe during normal operations.

• Must always be used when flying in gusty conditions.

• Is used to lock the controls on the ground to prevent damage in high wind conditions.

• Is only necessary on the elevators.