(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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