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A
747-400 MAINTENANCE MANUAL
 MERCURY SPILLAGE CONDITION - MAINTENANCE PRACTICES (CONDITIONAL INSPECTION)
___________________________________________________________________________
 1.  General
_______
 A.  One task is supplied in this procedure. The task is mercury spillage conditional inspection.
 B.  This section supplies an inspection and clean up procedures for areas where mercury has touched the airplane.
 C.  All metal airplane structure which is touched by mercury will decrease in structural strength. The rate at which mercury goes into the metal is different for each type of metal. Also, the type of protective finish applied to the metal will change the rate at which the mercury will go into the metal.
 NOTE: When the mercury starts to go into the metal, it can not
____
 be stopped.

 D.  The decrease in structural strength may not be seen until a load is applied to the structure.
 TASK 05-51-11-202-001
 2.  Mercury Spillage Conditional Inspection
_______________________________________
 A.  Standard Tools and Equipment
 (1)  
Vacuum Cleaner - High Capacity

 (2)  
Portable X-ray Equipment

 (3)  
Sensing Device (Mercury Sniffer)

 (4)  
Trap-Type Glass Container

 (5)  
Mercury Vacuum Pump - Lab Safety Co. P.O. Box 1368, Jonesville, Wisconsin 53545

 (6)  
10X Hand Lens

 (7)  
Medicine Dropper

 B.  Consumable Materials
 (1)  
G00009 Compound - Corrosion Inhibiting, BMS 3-23, Type II

 (2)  
D00066 Oil - Turbine Eng, Synthetic, MIL-L-23699

 (3)  
G00000 Cards - Index, 5x8, Standard Weight Paper Stock

 (4)  
G00000 Paper - Typewriter 8-1/2x11, 25 percent Cotton Fiber, 16 Weight

 (5)  
G00000 Tape - Transparent, 3M Scotch 810, Magic Transparent

 C.  Procedure-(Corrective Measures)
 S 222-002
 (1)  Examine the spill.
 (a)  
Make a note of the quantity of mercury which has touched the airplane structure.

 (b)  
Make a note of the location where the mercury has touched the airplane structure.

 (c)  
Isolate the airplane structure which the mercury has touched.

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 ALL  ú ú 01 Page 201 ú Jun 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 (d)
(e)

(f)

(g)

A
747-400 MAINTENANCE MANUAL
If the clean-up cannot be done immediately, apply a layer of corrosion inhibiting compound or engine oil.
 NOTE: This will slow the rate at which the mercury goes
____ into the airplane structure.
Inspection, clean-up, and repair must be done before the next
 flight.
Examine the lower lobe for mercury contamination.
 1) Remove the insulation blankets in the area where the

 mercury has touched the airplane. a) Discard the insulation blankets. 2) Remove the insulation downstream of the area where the mercury touched the airplane.
 NOTE: Remove the insulation to the nearest lateral
____
 fluid dam.

 3) Use a 10X hand lens to visually examine the structure. a) Look for any bare metal, scratches, or chipped paint. 4) Any areas from step (f) 3) and any joint which might been touched by mercury must be X-rayed.
 NOTE: Droplets of mercury show on an X-ray negative
____ as small white spots. Mercury corrosion and embrittlement show as tree-like forms which penetrate the structural component.
Examine the main deck for mercury contamination. 1) Examine the floor seals in the area where the mercury has touched the airplane.
 2)  If the floor seal appears to have been damaged or touched by the mercury, apply a small amount of water to the floor seal. a) Look to see if the water leaks through the floor seal.
 3)  If the floor seals show signs of damage, remove the floor panels and examine the structure below.
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 05-51-11
　
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