(10)   wing main ribs and compression members;

(11) wing or tail surface brace struts;

(12) engine mounts;

(13) fuselage longerons;

(14) members of the side truss, horizontal truss, or bulkheads;

(15) main seat support braces and brackets;

(16) landing gear brace struts;

(17) axles;

(18) wheels; (19) parts of the control system such as control columns, pedals, shafts, brackets, 

   or  horns;

(20) repairs involving the substitution of material; (21) the repair of damaged areas in metal or plywood stressed covering exceeding 

   six inches in any direction;

(22) the repair of portions of skin sheets by making additional seams.

(23) the splicing of skin sheets; (24) the repair of three or more adjacent wing or control surface ribs or the leading 

   edge of wings and control surfaces, between such adjacent ribs; (25) repair of fabric covering involving an area greater than that required to repair 

   two adjacent ribs; (26) replacement of fabric on fabric covered parts such as wings, fuselages,  

  stabilisers, and control surfaces;

(27) repairing, including re-bottoming, of removable or integral fuel tanks and oil tanks. (b) "Power Plant Major Repairs."  

Repairs of the following parts of an engine and repairs of the following types, are power plant major repairs —

(1) separation or disassembly of a crankcase or crankshaft of a reciprocating engine equipped with an integral supercharger;

(2) separation or disassembly of a crankcase or crankshaft of a reciprocating engine equipped with other than spur-type propeller reduction gearing;

(3) special repairs to structural engine parts by welding, plating, metalising, or other methods;

 (c) "Propeller Major Repairs"

 Repairs of the following types to a propeller are propeller major repairs —

(1)    any repairs to or straightening of steel blades;

(2) repairing or machining of steel hub;.

(3) shortening of blades;

(4) re-tipping of wood propellers;

(5) replacement of outer laminations on fixed pitch wood propellers;

(6) repairing elongated bolt holes in the hub of fixed pitch wood propellers;

(7)  inlay work on wood blades;

(8) repairs to composition blades;

(9)  replacement of tip fabric;

(10) replacement of plastic covering;

(11) repair of propeller governors;

(12)  overhaul of controllable pitch propellers; (13) repairs to deep dents, cuts, scars, nicks, etc., and straightening of aluminium 

blades;

(14) the repair or replacement of internal elements of blades.

 (d) "Appliance Major Repairs."

 Repairs of the following types to appliances are appliance major repairs —

(1) calibration and repair of instruments;

(2) calibration of avionics or computer equipment;

(3) rewinding the field coil of an electrical accessory;

(4) complete disassembly of complex hydraulic power valves;

(5) overhaul of pressure type carburettors, and pressure type fuel, oil, and hydraulic pumps.
 
APPENDIX 3 TO 5.005:   PREVENTIVE MAINTENANCE (DEFINITION)
 (a) "Preventive Maintenance."

Preventive maintenance is limited to the following work, provided it does not involve complex assembly operations -

(1) removal, installation and repair of landing gear tires;

(2) replacing elastic shock absorber cords on landing gear;

(3) servicing landing gear shock struts by adding oil, air, or both;

(4) servicing landing gear wheel bearings, such as cleaning and greasing.
　
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