UNSCHEDULED SERVICING - DESCRIPTION AND OPERATION
_________________________________________________
1. General
_______ This section provides instructions related to the servicing operations for which no frequency is specified. It is divided as follows:
-AIRCRAFT PROTECTION (Ref. ATA 12-31),
-SAMPLING FOR ANALYSIS (Ref. ATA 12-32),
-PRE-CONDITIONING (Ref. ATA 12-33),
-SYSTEM LINE FLUSHING (Ref. ATA 12-36).
AIRCRAFT PROTECTION - DESCRIPTION AND OPERATION
_______________________________________________
1. General
_______ Safe operation of aircraft in cold weather conditions raises specific problems. Aircraft downtime and delays in flight schedules caused by cold weather problems can be minimized by a program of preventive cold weather servicing. Procedures for cold weather servicing during cold weather must be developed by the operator. This servicing must meet their specific requirements based on :
-their cold weather experience
-
the available equipment and materials
-
the climatic conditions existing at their bases This topic contains information to assist the operator in defining developing, and implementing cold weather preventive maintenance procedures
R that will minimize aircraft downtime and improve the safe operating level of R the aircraft in adverse climatic conditions . These procedures are:
-12-31-11,P. Block 201 ANTI-ICING PROTECTION
-12-31-12,P. Block 201 ICE AND SNOW REMOVAL.
-12-31-21,P. Block 201 AIR CONDITIONING.
-12-31-24,P. Block 201 ELECTRICAL POWER.
-12-31-25,P. Block 201 EQUIPMENT/FURNISHINGS.
-12-31-27,P. Block 201 FLIGHT CONTROLS.
-12-31-28,P. Block 201 FUEL.
-12-31-31,P. Block 201 INDICATING/RECORDING SYSTEMS AND NAVIGATION.
-12-31-32,P. Block 201 LANDING GEAR.
-12-31-35,P. Block 201 OXYGEN SYSTEM
-12-31-38,P. Block 201 WATER/WASTE.
-12-31-49,P. Block 201 AUXILIARY POWER UNIT.
-12-31-51,P. Block 201 STRUCTURE.
-12-31-52,P. Block 201 DOORS.
-12-31-71,P. Block 201 POWER PLANT.
Cold Soak Definition
The aircraft is in cold soak configuration when :
-it is parked in cold weather (Outside Air Temperature (OAT) lower than 0 deg.C (32.00 deg.F)) and
-there is no supply of power to the aircraft (no air conditioning).
2. De-icing and Anti-icing Guidelines__________________________________
A. De-Icing and Anti-Icing Glossary
(1) De-icing is a procedure to remove frost, ice, snow and slush from the aircraft surfaces.
R R (2) De-icing fluids are normally applied heated. Typical de-icing fluids are :
- Heated water
- Newtonian fluids (ISO or SAE or AEA Type I) - Mixtures of water and Type I fluid - Non-Newtonian fluid (ISO or SAE or AEA Type II or Type IV fluid) - Mixtures of water and Type II or Type IV fluid.
R R R R (3) De-icing and anti-icing fluids shall be heated according to the fluid manufacturer's guidelines. For Type I fluids, water loss can cause undesirable aerodynamic effects.
R R R For Type II and type IV fluids, therminal exposure and/or water loss can cause a reduction in fluid viscosity leading to lower holdover times.
R R R R R R R R Any of the following situations or a combination of them can accelerate the fluid performance degradation: - low fluid consumption, - trucks being in standby mode with heating system on for extended periods of time, - high temperatures in fluid tanks, - high temperatures in water tanks which are in direct contact with the fluid tanks (no insulation between tanks).
R (4) Anti-icing is a precautionary procedure which provides protection against the formation of frost or ice and snow accumulation on the treated surfaces of the aircraft for a limited period of time, the holdover time.
R (5) Anti-icing fluids are normally applied cold directly onto clean aircraft surfaces. Typical anti-icing fluids are : - Newtonian fluids (ISO or SAE or AEA type I) - Mixtures of water and Type I fluid - Non-Newtonian fluids (ISO or SAE or AEA Type II or Type IV) - Mixtures of water and Type II or Type IV fluid.
R (6) Non-Newtonian Fluids (Type II or Type IV) have a viscosity that reduces with increased air flow over the fluid.
R (7) Newtonian Fluids (Type I) have a low viscosity that only changes with temperature 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320飞机维护手册 AMM SERVICING 2(43)
