S 377-012
(3)
Refer to the manufacturer's instruction to mix the conductive coatings.
S 937-011
(4)
Identify the container with a label. Write the date and hour when the compound was mixed and the hour when the pot life ends.
NOTE: The conductive coating compound has a pot life of 4 |0.5
____ hours at 75 |0.5°F. Do not use the compound if its pot life has ended.
S 377-013
(5)
Let the conductive coating compound stay for not less than 30 minutes before it is used.
S 957-014
(6)
Apply masking tape to all adjacent areas.
S 377-015
WARNING: DO NOT APPLY PAINT THAT HAS METAL PARTICLES ON THE ANTENNA
_______ FAIRINGS. THE METAL PARTICLES IN THE PAINT CAN CAUSE THE ANTENNA TO OPERATE INCORRECTLY.
(7)
Apply the conductive coating compound with a spray gun or use a brush. Make sure the dry film thickness is 0.6 |0.2 mil (0.006 |0.002 inch).
S 377-016
(8)
Let the conductive coating cure before you measure the conductivity (Fig. 702).
NOTE: Let the conductive coating that is in fastener holes cure for
____ not less than 20 minutes before you install the fasteners.
S 767-017
(9) Do these steps to measure the conductivity of the conductive coating by the Ohms Per Square Method (Fig. 703):
(a) Push the two probes of the multimeter against the conductive coating.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
51-24-03
ALL ú ú 01 Page 703 ú Jun 10/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
180
170 160 150 140 130 120 110 100
90
80
70
TEMPERATURE (`F)
15 30 45 60 75 90 105120
TIME (MINUTES)
Drying Time - BMS 10-21, Type III
Figure 702
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
51-24-03
ALL ú ú 01 Page 704 ú Oct 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
U23303
A
747-400 MAINTENANCE MANUAL
(b)
Measure the resistivity between the two strips by use of the multimeter.
(c)
The measured value multiplied by 10 will give the value of resistivity in ohms/square.
(d)
The maximum permitted resistivity is 300,000 ohms/square.
S 107-018
(10) Do these steps, if the resistivity of the conductive coating is more than 300,000 ohms/square:
(a)
Sand the area with 240 grit or finer abrasive paper. Do not sand through the coating.
(b)
Remove the remaining particles with a clean cheesecloth that is moist with aliphatic naphtha. Then dry the surface with a clean cheesecloth.
(c)
Apply the new layers of conductive coating. Refer to the above procedure.
(d)
Do the above steps to measure the conductivity of the new layers of coating.
S 377-019
(11) Do these steps, if you are to apply a topcoat.
(a) Rub the conductive coating with a clean cheesecloth that is moist with solvent.
ALUMINUM FOIL STRIPS
Method for Measuring Resistance of Conductive Finish by the Ohms Per Square Method
Figure 703
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
51-24-03
ALL ú ú 01 Page 705 ú Oct 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
(b) Rub the surface with a clean, dry cheesecloth before the solvent dries. Clean the surface until no soil or dust
(c) particles are found on a clean cheesecloth.Apply BMS 10-79 Type II or III in a uniform coat, free of runs and wrinkles, to a dry film thickness of 0.5 to 0.8 mil within 24 hours after application of conductive coating (AMM 51-24-11/701).
中國航空網(wǎng) m.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：747-400 AMM 飛機(jī)維護(hù)手冊 結(jié)構(gòu) STRUCTURES(33)
