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A
757
MAINTENANCE MANUAL
FUEL TANK VENTSEE C
(BOTTOM OF RIGHT WING)
SEE C
SEE A
FUEL TANK VENT SEE B
(BOTTOM OF LEFT
SEE C WING)
SEE A
SEE B
SEE A SEE C
SEE B SEE C SEE A
STATIC FUEL TANK VENT
DISCHARGER (BOTTOM OF LEFT AND RIGHT WINGS)
ALUMINUM OR
SETSCREW
TITANIUM BASE
EXAMPLE TRAILING EDGE
SURFACE INSTALLATION
A TITANIUM BASE DISCHARGER BASE
BASE RIVETED
ADAPTER ASSEMBLY
TO ADAPTER
ALUMINUM BASE STATIC DISCHARGER SETSCREW SETSCREW
STATIC
DISCHARGER
EXAMPLE TRAILING EDGE SURFACE INSTALLATION WITH ADAPTER ASSEMBLY
B
EXAMPLE STABILIZER TIP, WING TIP
AND FIN CAP INSTALLATION
C
Static Discharger Installation
Figure 201
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MAINTENANCE MANUAL
S 862-065
WARNING:_______USE THE PRECAUTIONS THAT FOLLOW WHEN YOU USE A MEGOHMMETER. IF YOU DO NOT USE PRECAUTIONS, THEN IT IS POSSIBLE THAT AN EXPLOSION OR FIRE CAN OCCUR.
(4) Use these precautions for possible fuel vapors when you use a megohmmeter:
(a)
Use the Quadtech 1863 megohmmeter or equivalent meter with a 500 VDC test voltage and a maximum 5 milliampere short circuit current.
(b)
Do not use a megohmmeter at these locations: 1) Area adjacent to or below a wing fuel tank vent, five foot
(1.524 meters) diameter column, from vent to ground.
2) Zero to 18 inches (457 mm) above the ground in the area around the airplane.
(c) Make sure that: 1) Area is well ventilated. 2) Metal workstands are grounded. 3) Megohmmeter is plugged into a grounded receptacle. 4) Megohmmeter is insulated from metal work stands.
S 862-074
(5)
Set the megohmmeter to 500 VDC test voltage.
S 222-005
(6)
Measure the resistance between the discharger tip and the base for all the dischargers. Make a sponge, cotton cloth, or paper towel wet with tap water, and push against the tip of the discharger. Put the megohmmeter leads on the base and on the wet cloth. Examine resistance readings as follows:
NOTE: It is important to have good contact between the wet cloth
____ and the flat area of the discharger tip end. It is not sufficient to clip the megohmmeter lead directly to the tip.
S 222-066
(7)
Make sure that the measured resistance is between 6-100 megohms.
(8)
Replace the dischargers that do not read the correct resistance.
S 862-006
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TASK 23-61-01-202-071
3. Static Discharger Base Inspection/Check_______________________________________
A. Equipment
(1) Bonding meter (SWPM 20-20-00)
B. References
(1) AMM 51-21-10/701, Decorative Exterior Finishes
C. Access
(1) Location Zones
500/600 Left Wing/Right Wing
300 Empennage and Body Section 48
D. Procedure
S 222-067
WARNING:_______MAKE SURE THAT THE BONDING METER IS RESISTANT TO EXPLOSION. IF NOT, IT IS POSSIBLE THAN AN EXPLOSION OR FIRE CAN OCCUR.
(1)
Use a bonding meter (SWPM 20-20-00) to do a check of the static discharger bond between the discharger bases and airplane surface.
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