(4)  
AMM 20-10-21/401, Electrical Bonding

 (5)  
AMM 20-10-21/601, Electrical Bonding

 (6)  
AMM 20-10-22/701, Metal Surfaces

 (7)  
AMM 28-11-00/201, Fuel Tanks

 (8)  
AMM 28-11-01/401, Main Tank Access Doors

 (9)  
AMM 29-11-00/201, Main (Left, Right, and Center) Hydraulic Systems

 C.
Access

 (1)  
Location Zones 541 Main Tank - Rib No. 5 to No. 7 (Left) 641 Main Tank - Rib No. 5 to No. 7 (Right)

 (2)  
Access Panels
 541BB Main Tank
 641BB Main Tank

 D.
Procedure

 S 144-014
 (1)  
Clean the surfaces for a good electrical bond at the locations of the bonding jumpers (AMM 20-10-22/701).

 S 434-017

 (2)  
Put the phenolic washers in their positions at the location of the bolts which hold the heat exchanger.

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 (3)  S 424-018Put the heat exchanger in its position on the washers.
 (4)  S 424-019Install the bolts which hold the heat exchanger.
 (5)  S 434-022Do these steps to adjust the clearance at the heat exchanger lugs: (a) Measure the clearance at each heat exchanger lug. (b) If the clearance is more than 0.008 inch, do these steps: 1) Remove the phenolic washer. 2) Measure the clearance between the heat exchanger lug and the structure. 3) Install an assembly of phenolic washers with the correct thickness.
 (6)  S 214-023Make sure the hydraulic lines align with those on the heat exchanger.
 (7)  S 434-025Connect the bonding jumper with one of the bolts that hold the heat exchanger (AMM 20-10-21/401).
 (8)  S 424-026Tighten the bolts that hold the heat exchanger.
 (9)  S 434-027Cut the hydraulic lines as shown on Fig. 401.
 S 434-028

 (10) Install new sections of the hydraulic line with the permaswage unions (AMM 20-10-09/801).
 S 764-040
 WARNING: MAKE SURE THE RESISTANCE OF THE ELECTRICAL BOND IS NOT MORE
_______ THAN THE LIMITS. THE RESISTANCE OF THE ELECTRICAL BOND IS VERY IMPORTANT IF LIGHTNING HITS THE AIRPLANE.
 (11) Do a check, with a bonding meter, that the resistance of the electrical bond is not more than these limits (AMM 20-10-21/601):
 (a)  
0.0025 ohm resistance between the heat exchanger lug and the bonding jumper.

 (b)  
0.00075 ohm resistance across the swaged unions, from one tube to the other tube.

 NOTE: Do this measure on the tube, 1/4 inch from each end of
____ the union.
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 (c)  0.00041 ohm resistance between the tube and the bulkhead
 fitting.
 NOTE:____ Make this measure on the fitting, one inch from the end
 which has a permaswage and on the tube, 1/4 inch from
　
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