(2)
The second task is the instructions to apply the corrosion preventive compound.
(3)
The third task is the removal of corrosion preventive compound.
TASK 51-24-13-107-001
2. Prepare the Surface___________________
A. Consumable Materials
(1)
B00535 Solvent - Perchloroethylene, Technical, O-T-236
(2)
G00034 Cheesecloth - Clean and Lint-Free
(3)
G00000 Tape - Masking, No. 221, 3M company
(4)
G00000 Caps - Protective closure for exposed oxygen system tubing
(5)
G00818 Film - Plastic
(6)
G00111 Sheeting - Plastic Film,Mylar
(7)
G00000 Polyethylene
(8)
G00000 Polyvinyl Chloride
(9)
G00000 Paper - Polyethylene coated
B. References
(1)
AMM 24-22-00/201, Manual Control
(2)
AMM 20-41-01/201, Static Grounding (Airplanes)
(3)
AMM 35-00-00/201, Oxygen
C. Procedure
S 587-002
(1)
Remove the electrical power (AMM 24-22-00/201).
(2)
Ground the airplane (AMM 20-41-01/201).
(3)
Clean the surfaces with a vacuum cleaner.
S 587-003
S 147-004
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747-400 MAINTENANCE MANUAL
S 117-005
(4) Clean the surface with perchloroethylene solvent.
NOTE: You must fully clean the surface to help the corrosion
____ preventive compound get in the surface and mating surfaces.
S 957-006
(5)
Apply masking tape or plastic to the adjacent surfaces.
S 957-007
(6)
Apply masking tape to the open electrical connector to keep contamination out of the electrical contacts.
S 957-008
WARNING: DO NOT LET CORROSION PREVENTIVE COMPOUND GET IN THE OXYGEN
_______ SYSTEM. IF THE CORROSION PREVENTIVE COMPOUND GETS IN THE OXYGEN SYSTEM, A FIRE OR AN EXPLOSION CAN OCCUR.
(7)
Make sure you keep the BMS 3-23 corrosion preventive compound out of the oxygen system (AMM 35-00-00/201).
S 957-009
(8)
Put covers on the control cables, pulleys, teflon bearings, rubber, silicone, and lubricated surfaces.
NOTE:____Masking tape is not sufficient. Use plastic or equivalent covers to fully seal the equipment from the compound.
TASK 51-24-13-607-010
3. Corrosion Preventive Compound - Apply
_____________________________________
A. General
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747-400
MAINTENANCE MANUAL
WARNING: THE BMS 3-23 IS APPROXIMATELY AS POISONOUS AS KEROSENE OR
_______ ALIPHATIC NAPHTHA. USE THE SAME PRECAUTIONS FOR BMS 3-23 AS KEROSENE. WHEN YOU SPRAY THE BMS 3-23 IN A CLOSED AREA, A GAS CONCENTRATION OF 500 PPM (PARTS PER MILLION) IS THE MAXIMUM COMFORTABLE WORKING LIMIT. AT THIS CONCENTRATION, A PERSON CAN WORK FOR 8 HOURS. GAS LEVELS MORE THAN 500 PPM ARE NOT FULLY POISONOUS, BUT YOU MUST SUPPLY A FLOW OF AIR TO KEEP THE AREA COMFORTABLE. PERCHLOROETHYLENE IS THE RECOMMENDED SOLVENT BECAUSE IT IS NONFLAMMABLE. BUT, PERCHLOROETHYLENE IS POISONOUS. YOU MUST SUPPLY A FLOW OF AIR IF YOU WILL USED IT IN CLOSED AREAS. RESPIRATORY DEVICES AND SKIN PROTECTION CAN BE NECESSARY.
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