(2)
Refinish the surface with the correct primer and paint.
(3)
Install replacement tires and wheels (Ref 32-45-11/401).
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500 Brake Cooling Schedule
May 01/03 Figure 201 (Sheet 1) 5-51-111
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Brake Cooling Schedule 500
5-51-111 Figure 201 (Sheet 2) May 01/03
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MERCURY SPILLAGE CONDITION - MAINTENANCE PRACTICES (CONDITIONAL INSPECTION)
1. General
A. It is assumed that any significant quantity of mercury on board an airplane is properly
contained, packaged and labeled for loading in a cargo compartment.
B. The spillage of mercury or a mercury compound, within an airplane, requires immediate action for its isolation and recovery to prevent possible corrosion damage to and possible embrittlement of aluminum alloy structural components.
C. All metallic aircraft structure which is wetted by elemental mercury suffers severe degradation in strength. The rate of diffusion of mercury into a metal is dependent on the specific metal contacted and the protective finish applied; however, once diffusion has started it cannot be stopped. Structural degradation may not be visually apparent until the structure is subject to load (Ref Structural Repair Manual, Chapter 51, Mercury Spillage Corrective Action).
D. When using X-ray equipment to detect mercury, droplets of mercury will show on a negative as small white spots. Corrosion and embrittlement will show as tree-like forms completely penetrating a structural component.
E. Personnel precautions
(1) Mercury spreads very easily from one surface to another. It adheres to hands, shoes, clothes, tools, hoses, etc.; therefore, the following precautions must be observed:
(a)
Allow no through traffic from the contaminated section to any "clean" section.
(b)
Avoid contact with surfaces suspected of being contaminated. If necessary, use wood or fiber sheets to support body while working in the area. Do not attempt to pick up free mercury or amalgamated mercury by hand.
(c)
Clean tools with soap and hot water or by a steam bath. Discard drill bits after use on mercury contaminated structure.
(d)
Wear wing socks in the contaminated area to prevent scratching the exposed surfaces. Throw away socks after use. Clean shoes with vacuum cleaner and wash them with hot water and soap. Thoroughly wash clothes worn during cleanup as soon as possible.
(e)
Always wash thoroughly after contacting mercury. Keep hands away from mouth. Do not eat, smoke or even blow nose without first washing your hands carefully.
(f)
Appreciable amounts of mercury will vaporize at normal temperatures to the extent that a stagnant air mass will become dangerous to personal health.
WARNING: ALWAYS PROVIDE AMPLE VENTILATION WHILE CLEANING MERCURY CONTAMINATED AREAS.
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F. Precautions for cleaning up mercury spilled on floor.
(1)
When mercury is found on the floor, do not remove access plates/inspection plates, screws, rivets, etc., from floor. Any hole which is left open in the contaminated area of the floor may allow mercury to spread to the structure underneath the floor.
(2)
Do not use cleaning materials such as solvents, solids or polishes on the contaminated areas. These materials may promote the corrosion.
(3)
If hands become contaminated while working with clean-up equipment, do not touch any exposed metal in the surrounding area as you may contaminate it.
(4)
If corrosion is evident and clean-up cannot be completed immediately, coat contaminated area with corrosion preventative oil (CP oil) or with engine oil. This helps to slow down the rate of corrosion and also helps to prevent spreading of the contamination.
2. Equipment and Materials
A. Corrosion preventative oil, or engine oil
B. Cardboard
C. Paper troughs
D. Scotch tape
E. Zinc oxide tape
F. Medicine dropper
G. High capacity vacuum cleaner
H. Trap-type glass container
I. Mercury vacuum pump, Lab Safety Supply Co., P.O. Box 1368, Jonesville, Wisconsin 53545
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