P A P E R - III
Category A : AIRFRAME (AIRCRAFT HAVING AUW BELOW 5700 KG.)
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1. Aircraft Materials
Knowledge of effect of various alloying elements used in
steel, properties and their use.
Knowledge of Heat treatment of Steel and Aluminium.
Knowledge of surface hardening processes used on aircraft
metals.
Knowledge of welding techniques such as gas welding, arc
welding, electric welding etc.
Knowledge of identification and physical characteristics of
commonly used composite materials, plastics, sealants and
rubbers and their inspection and repair.
Detailed knowledge of metal/ fabric materials used in air-
craft structure; the types of defects associated with them;
inspection for deterioration, and methods of rectification
and reprotection; procedures for testing the soundness of
these materials. Doping process.
Knowledge of the various methods used for removal of
corrosion from common aircraft metals and methods employed
to prevent corrosion.
Knowledge of types of wood and glue and their characteris-
tics, general defects, tests, inspection and repair.
Knowledge of cables, chains and sprockets.
2. Aerodynamics
Knowledge of the characteristics of the subsonic airflow and
the various terms used therein.
Knowledge of the characteristics of the aerofoils.
Knowledge of the forces acting on the Aircraft during all
phases of flight.
Detailed knowledge of Aircraft Stability and Control.
Knowledge of the effect of altitude,weight,changes of engine
power on performance of the aircraft.
3. Aircraft Structures
General understanding of the various types of structures
used in Aircraft construction, Station Nos.
Knowledge of such terms as damage tolerance, aging Aircraft,
SSID.
Knowledge of fail-safe and safe-life concept.
Knowledge of various types of methods used on tubular struc-
ture, semi-monocoque fuselage, method of attachment of wing
to the fuselage; permanent and semi-permanent joints, their
inspection and repair.
4. Aircraft Systems
General knowledge of the function, maintenance and
inspection of the following :
(a) Structure and structural components constructed from
metal, glass fibre, glass reinforced plastic, vinyl,
perspex.
(b) Furnishing materials, paints, surface finishes and
associated materials.
(c) Elementary flying controls; hydraulics; pneumatics;
landing gear; brakes; nose wheel steering; ice and rain
protection; fire detection and protection, warning and
extinguishing; oxygen; airconditioning and pressuriza-
tion systems; wheels; tyres; brakes; antiskid.
(d) Windows, doors and emergency exits.
5. Aircraft Instruments and Equipments
Detailed knowledge of the procedures of replacement and in-
situ operational tests of all instruments (except the engine
related instruments) and equipment (except where the use of
special test instrument/ equipment is required.)
Knowledge of construction of various types of Direct Reading
Compass, various related terms used in electricity/ magnet-
ism, and compass swing precautions and procedures.
6. Inspection Of Aircraft
Knowledge of minor defects, their reporting, investigation
and methods of rectification and repair of minor defects,
rigging of aircraft, periodical inspection necessary to
check the serviceability of the Aircraft, preparation of a
brief report with the help of sketches if necessary in case
of damage to the Aircraft. Symmetry check, Balancing of
control surfaces; duplicate inspection.
Detailed knowledge of the various inspections such as heavy
landing, lightening strike , overweight landing, abnormal
flight loads etc.; Familiarity of the structural manuals,
various types of repairs given by the manufacturer therein;
incorporation of alternate/ equivalent materials; raising up
of modifications, repair schemes to the aircraft during
overhaul.
Knowledge of terms related to aircraft weighing, prepara-
tion/ precautions for weighing, preparation of weight sched-
ule, calculation of centre of gravity.