854 

14 CFR Ch. I (1–1–19 Edition) 

Pt. 43, App. A 

the following types, are powerplant major re-
pairs: 

(i) Separation or disassembly of a crank-

case or crankshaft of a reciprocating engine 
equipped with an integral supercharger. 

(ii) Separation or disassembly of a crank-

case or crankshaft of a reciprocating engine 
equipped with other than spur-type propeller 
reduction gearing. 

(iii) Special repairs to structural engine 

parts by welding, plating, metalizing, or 
other methods. 

(3) 

Propeller major repairs. 

Repairs of the 

following types to a propeller are propeller 
major repairs: 

(i) Any repairs to, or straightening of steel 

blades. 

(ii) Repairing or machining of steel hubs. 
(iii) Shortening of blades. 
(iv) Retipping of wood propellers. 
(v) Replacement of outer laminations on 

fixed pitch wood propellers. 

(vi) Repairing elongated bolt holes in the 

hub of fixed pitch wood propellers. 

(vii) Inlay work on wood blades. 
(viii) Repairs to composition blades. 
(ix) Replacement of tip fabric. 
(x) Replacement of plastic covering. 
(xi) Repair of propeller governors. 
(xii) Overhaul of controllable pitch propel-

lers. 

(xiii) Repairs to deep dents, cuts, scars, 

nicks, etc., and straightening of aluminum 
blades. 

(xiv) The repair or replacement of internal 

elements of blades. 

(4) 

Appliance major repairs. 

Repairs of the 

following types to appliances are appliance 
major repairs: 

(i) Calibration and repair of instruments. 
(ii) Calibration of radio equipment. 
(iii) Rewinding the field coil of an elec-

trical accessory. 

(iv) Complete disassembly of complex hy-

draulic power valves. 

(v) Overhaul of pressure type carburetors, 

and pressure type fuel, oil and hydraulic 
pumps. 

(c) 

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. 

(5) Replacing defective safety wiring or 

cotter keys. 

(6) Lubrication not requiring disassembly 

other than removal of nonstructural items 
such as cover plates, cowlings, and fairings. 

(7) Making simple fabric patches not re-

quiring rib stitching or the removal of struc-

tural parts or control surfaces. In the case of 
balloons, the making of small fabric repairs 
to envelopes (as defined in, and in accord-
ance with, the balloon manufacturers’ in-
structions) not requiring load tape repair or 
replacement. 

(8) Replenishing hydraulic fluid in the hy-

draulic reservoir. 

(9) Refinishing decorative coating of fuse-

lage, balloon baskets, wings tail group sur-
faces (excluding balanced control surfaces), 
fairings, cowlings, landing gear, cabin, or 
cockpit interior when removal or dis-
assembly of any primary structure or oper-
ating system is not required. 

(10) Applying preservative or protective 

material to components where no dis-
assembly of any primary structure or oper-
ating system is involved and where such 
coating is not prohibited or is not contrary 
to good practices. 

(11) Repairing upholstery and decorative 

furnishings of the cabin, cockpit, or balloon 
basket interior when the repairing does not 
require disassembly of any primary struc-
ture or operating system or interfere with an 
operating system or affect the primary 
structure of the aircraft. 

(12) Making small simple repairs to fair-

ings, nonstructural cover plates, cowlings, 
and small patches and reinforcements not 
changing the contour so as to interfere with 
proper air flow. 

(13) Replacing side windows where that 

work does not interfere with the structure or 
any operating system such as controls, elec-
trical equipment, etc. 

(14) Replacing safety belts. 
(15) Replacing seats or seat parts with re-

placement parts approved for the aircraft, 
not involving disassembly of any primary 
structure or operating system. 

(16) Trouble shooting and repairing broken 

circuits in landing light wiring circuits. 

(17) Replacing bulbs, reflectors, and lenses 

of position and landing lights. 

(18) Replacing wheels and skis where no 

weight and balance computation is involved. 

(19) Replacing any cowling not requiring 

removal of the propeller or disconnection of 
flight controls. 

(20) Replacing or cleaning spark plugs and 

setting of spark plug gap clearance. 

(21) Replacing any hose connection except 

hydraulic connections. 

(22) Replacing prefabricated fuel lines. 
(23) Cleaning or replacing fuel and oil 

strainers or filter elements. 

(24) Replacing and servicing batteries. 
(25) Cleaning of balloon burner pilot and 

main nozzles in accordance with the balloon 
manufacturer’s instructions. 

(26) Replacement or adjustment of non-

structural standard fasteners incidental to 
operations. 

(27) The interchange of balloon baskets and 

burners on envelopes when the basket or 

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