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of very "effective" processes can prove to be more detrimental than useful in the long run - refer to 12-20-03.
Washing the equipment can cause the removal of "temporary protection" (such as oil, grease, etc...) on certain components (actuator cylinder, hinge, mechanical coupling, etc...). Apart from "pre-maintenance check washing", any temporary protection shall be restored immediately after cleaning the equipment.
B. Inspections
Irrespective of the care taken for cleaning equipment and applying protective products, latent corrosion risks subsist and therefore require equipment surveillance.
Such surveillance may be exercised by :
- systematic inspections possibly part of the scheduled inspections - refer to 05-20-00.
- pinpoint inspections depending on exceptional operating conditions or special risks connected with a
geographical situation,
- thorough inspection of the following areas :
• fuselage lower sections,
underside of wings and stabilizers,
wing internal structure, especially between root and fuel tank fwd and aft of spar,
structures under floors and carpets,
structures hidden by heat insulating and soundproofing materials,
"low points" incorrectly drained,
watertight but air untight compartments. Due to temperature changes, their 'breathering' permits the introduction of moisture and buildup of condensation water,
electrical harnesses and connectors (condensation favors fungus, spurious currents and short circuits),
dissimilar elements (clamps, steel supports, cadmium-plated parts secured to stainless steel parts, etc...),
landing gear components (wheels, actuator housing, cylinders),
areas exposed to exhaust gases (frequent cleaning),
piano type hinges,
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Validity : S / N 1 - 9999
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(BA) OCT 97
. battery area (electrolyte spillage),
. antennas, dynamic and static ports, radomes, etc... C. Maintenance of anticorrosive protections
Inspections, usually performed after cleaning the equipment, may reveal, even without corrosion as such, defects in the protective coatings applied to the equipment upon fabrication or reconditioning :
- paint flaking or chafing,
- coating scratches,
- varnish crazing,
- clad separation,
- vanishing surface treatment, etc...
Such defects should be reworked as early as possible to ensure equipment protection continuity and avoid incipient corrosion that should start in such defects.
Unpainted metal surfaces
The application of a (TB 05-909A) or (TB 05-909B) polishing product permits regular care of metal surfaces. Scratches should be removed with a (TB 05-909C) or (TB 05-910A) polishing product according to size.
Painted metal surfaces
Dulled or very slightly scratched painted surfaces can be reconditioned with a (TB 11-906) glossing and protecting product.
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TB20 MAINTENANCE MANUAL 20 STANDARD PRACTICES AIRFRAME TB20飞机维护手册 20 标准施工机体(32)
