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Apply waterproof compound (TB 05-027D) on :
- hinges and locks of all access doors,
- hinges of cabin doors, baggage compartment door and tabs hinges,
- doors locks by spraying into the lock itself. Do not spray product on the lock placards. Insist on areas which could retain or trap humidity by streaming or condensation.
4) Airframe and wing interior
The airframe and the wing interior are closed areas in which agressions liable to bring corrosion are limited to ambiant humidity and condensation.
Apply waterproof compound (TB 05-027D) by spraying through access doors (apply Service Letter No. SL 10-030-57 at the latest revision, if necessary) and all removable elements (wing tips, tail cone, etc ...) in order to reach all areas. Particularly insist on :
- attachments by screws or rivets,
- flight controls cables,
- equipment (electrohydraulic generator, fuel selector, fuel pump),
- fluids pipes fittings,
- control rods end fittings,
- the wing spar (area included between the main landing gear and the two wing splicings),
- treatments in fuselage (skins / frames, skins / spars, skins / skins),
- treatments in wings (skins / ribs, skins / spars, skins / skins),
- electric connections.
Insist on low points which could retain or trap humidity by streaming or condensation. F. Important remarks
WARNING : AS THESE PRODUCTS ARE ORGANIC PRODUCTS, THEY MUST NEVER BE SPRAYED ON OXYGEN EQUIPEMENT
In no case, application of the product does replace lubrication operations of hinges, rotating parts and other mobile links of the aircraft.
On the other hand, lubricating properties of the product may be favourably used on small mechanisms
which are less stressed such as microswitches, access doors hinges and locks, tabs hinges, etc ...
G. Periodicity (Figure 201)
The protection life time after application of products mainly depends on environmental conditions to which are exposed the elements to be protected.
For the whole aircraft, these conditions are essentially :
- humidity ratio,
- atmosphere salinity or acidity,
- sand or dust atmosphere ratio,
- storage conditions outside or in hangar.
NOTE : The climatic areas are shown in Figure 201, however, local conditions may be more or less severe.
Moreover, some aircraft areas are submitted to a more severe environment as they are more exposed to agents such as :
- water, stones, mud or grass projections,
- action of corrosive agents such as exhaust gases, fuel, cleaning products or solvents. There results a classification of aircraft areas by severity decreasing order :
Area 100 - engine compartment
Areas 500, 600, 700 - landing gears (and their wells in the case of retractable landing gears)
Areas 200, 300, 500, 600 - structural and flight controls parts, hardware, doors mechanisms
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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(40)
