S 222-072
(2)
Use method 1 or method 2 to measure the bond resistance.
(a) Method 1 - Use a bonding meter (SWPM 20-20-00) to measure the dc resistance between the static discharger base and the bonded airplane surface.
NOTE: This resistance measurement is for in-service bonds
____ and static discharger bases. You will get a different measurement value for a newly installed bond and static discharger base.
Make sure both leads touch bare metal. When a surface is coated with paint, scrape off a small amount of paint or use a sharp probe to penetrate the paint.
1) Do the test as follow: a) Put one meter lead on the discharger base. b) Put one meter lead on the airplane surface.
2) ALUMINUM DISCHARGER BASE INSTALLED ON ALUMINUM SKIN; Make sure the resistance is not more than 0.5 ohms. 3) ALUMINUM DISCHARGER BASE INSTALLED ON THORSTRAND SURFACE; Make sure the resistance value is not more than 0.05 ohms.
CAUTION: CAREFULLY CLEAN THE SURFACE ONLY UNTIL THE BRIGHT
_______ ALUMINUM COMES INTO VIEW. DAMAGE TO THE ALUMINUM COATING AND THE GLASS FIBERS CAN OCCUR.
a) If necessary, clean the Thorstrand surface by hand. Apply Scotch Brite to make a small area rough.
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757 MAINTENANCE MANUAL
4) TITANIUM DISCHARGER BASE INSTALLED ON A CARBON COMPOSITE SURFACE; Make sure the resistance value is not more than 5.0 ohm.
5) ALUMINUM DISCHARGER BASE INSTALLED ON A KEVLAR SURFACE (HORIZONTAL STABILIZER TIP); Make sure the resistance value is not more than 0.5 ohms.
6) Paint the area where paint was removed for the airplane surface resistance test (AMM 51-21-10/701).
(b) Method 2 - Use a bonding meter (SWPM 20-20-00) to do a check of the bond resistance between two adjacent discharger bases.
NOTE: This resistance measurement is for in-service bonds
____ and static discharger bases. You will get a different measurement value for a newly installed bond and static discharger base.
Make sure both leads touch bare metal. When a surface is coated with paint, scrape off a small amount of paint or use a sharp probe to penetrate the paint.
1) Do the test as follow: a) Put one meter lead on the discharger base. b) Put one meter lead on the adjacent discharger base.
2) ALUMINUM DISCHARGER BASE INSTALLED ON ALUMINUM SKIN; Make sure the resistance is not more than 1.0 ohm. 3) ALUMINUM DISCHARGER BASE INSTALLED ON THORSTRAND SURFACE; Make sure the resistance value is not more than 0.10 ohms.
4) TITANIUM DISCHARGER BASE INSTALLED ON A CARBON COMPOSITE SURFACE; Make sure the resistance value is not more than 10.0 ohms.
5) ALUMINUM DISCHARGER BASE INSTALLED ON A KEVLAR SURFACE (HORIZONTAL STABILIZER TIP); Make sure the resistance value is not more than 1.0 ohms.
S 102-056
(3) For discharger bases that do not read the correct resistance, do the steps that follow:
(a)
Remove the base.
(b)
Clean the bonding surfaces.
(c)
Install or replace the discharger base. Refer to the Static Discharger Base Removal/Installation section.
TASK 23-61-01-002-009
4. Static Discharger Removal (Fig. 201)
_________________________
A. Access
(1) Location Zones
500/600 Left Wing/Right Wing
300 Empennage and Body Section 48
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757 MAINTENANCE MANUAL
B. Removal of Trailing Edge Type Static Discharger:
S 032-010
(1)
Loosen the setscrew four or five turns on the discharger.
S 022-011
(2)
Put a thin-bladed screwdriver or putty knife into the junction between the discharger casting and the discharger base.
(a) Pry on the discharger and pull out on the sides of the discharger casting to remove the discharger from the base.
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