(g)
Make the area dry with clean cloths.
(h)
Repair the area if it is necessary after it is fully dry.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
MERCURY SPILLAGE CONDITION - MAINTENANCE PRACTICES
__________________________________________________ (CONDITIONAL INSPECTION)
________________________
1. General_______
A. This section gives procedures to examine and clean the airplane after a mercury spill.
B. When elemental mercury leaks on to an all metallic structure, severe structural strength degradation occurs. The rate of the diffusion of the mercury into a metal is related to the type of metal touched. The diffusion is also related to the type of finish protection the metal has. But, when the diffusion has started, it can not be stopped. Structural degradation is not always visually apparent until a load is applied to the structure.
C. Make a record of the general quantity of the mercury spilled.
D. Make a record of the location where the mercury was spilled.
E. Isolate the mercury spill area to prevent contamination to other areas.
F. The inspection/removal/repair must be made before subsequent flights.
G. Structural repairs are necessary if there are signs of mercury
contamination.
H. Make sure that no free mercury is in the airplane. Use mercury sniffers and X-ray equipment (if available) to find free mercury.
TASK 05-51-21-212-001
2. Mercury Spillage Conditional Inspection_______________________________________
A. Equipment
(1)
Medicine dropper
(2)
High capacity vacuum cleaner
(3)
Trap-type glass container
(4)
Mercury vacuum pump, Lab Safety Supply Co.,
P.O. Box 1368, Janesville, Wisconsin 53545
(5)
10X hand lens
(6)
Sensing device (mercury sniffer) or equivalent
(7)
Portable X-ray equipment
B. Consumable Materials
(1) Corrosion preventive oil, or engine oil
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757
MAINTENANCE MANUAL
(2)
Cardboard
(3)
Paper troughs
(4)
Scotch tape
(5)
Zinc oxide tape
C. References
(1)
AMM 25-50-07/401, Insulation - Cargo Compartment
(2)
AMM 53-01-01/401, Floor Panels
D. Mercury Spillage Inspection and Clean-up
S 142-002
WARNING:_______DO NOT GET MERCURY IN YOUR MOUTH, OR EYES, OR ON YOUR SKIN. DO NOT BREATH THE FUMES FROM THE MERCURY. PUT ON PROTECTIVE SPLASH GOGGLES AND GLOVES WHEN YOU CLEAN A MERCURY SPILL. MERCURY IS POISONOUS AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(1) Remove all of the mercury you can see with cardboard and paper troughs. You can also use zink oxide tape, eye droppers, or a vacuum cleaner.
(a) Vacuum the area where the mercury spillage occurred.
1) Clean a small mercury spill with a trap-type glass container, or a high flow vacuum cleaner.
NOTE: Mercury fumes can cause contamination to a
____ commercial vacuum cleaner.
2) Clean a large mercury spill with a mercury vacuum cleaner.
E. Lower Lobe (Major Zone 100) Mercury Spillage
S 022-003
(1)
Remove the insulation blankets in the spill area and discard them. Also remove all of the insulation downstream of the spill to the nearest lateral fluid dams (AMM 25-50-07/401).
S 142-010
(2)
Remove all of the mercury you can see with cardboard and paper troughs. You can also use zink oxide tape, eye droppers, or a vacuum cleaner.
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