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A
747-400
MAINTENANCE MANUAL
S 374-021
(4)
If you adjusted the shim laminations, apply primer to the bare shim surface.
S 434-011
(5)
Install the weather seal around the bottom of the dorsal fin.
S 864-022
(6)
Make sure the seal is smooth around the bottom of the dorsal fin.
S 434-012
(7)
Attach the bonding jumper to the aft side of dorsal fin rib.
S 224-013
(8)
Do a check to make sure the resistance between the dorsal fin rib and the leading edge rib is less than 0.010 ohms (Ref 20-22-01/601).
S 124-023
(9)
If it is necessary, clean the mating surfaces for the bonding jumper with abrasive paper.
S 434-014
(10)
Install the fasteners around the bottom of the dorsal fin.
S 224-015
(11)
Make sure the fastener heads are smooth with the dorsal fin skin.
NOTE:____ The maximum distance below the surface is 0.010 inch.
The maximum distance above the surface is 0.002 inch. Do not
cut the fastener heads to get the correct flushness.
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55-30-03
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A
747-400 MAINTENANCE MANUAL
EMPENNAGE ACCESS PANELS - REMOVAL/INSTALLATION
_________________________________________________
1. General_______
A. This procedure contains two tasks:
(1)
The first task is the removal of the panels from the empennage.
(2)
The second task is the installation of the empennage panels.
(3)
Remove the panel as follows:
-Loosen the screws on the panel.
-Remove the panel from the empennage.
(4)
Install the panel as follows:
-Clean and remove the remaining sealant
-Install the panel
-Tighten the screws
-Seal the space between the skin panels
B. The panels are part of the panel assemblies of the empennage . The edge of each panel is held together directly between the adjacent honeycomb panel and panel stiffener.
TASK 55-30-10-004-001
2. Panel Removal______________
A. Access
(1) Location Zone
320 Vertical Stabilizer
330 Horizontal Stabilizer, Left
340 Horizontal Stabilizer, Right
B. Procedure
S 024-002
(1) Remove the panel.
(a) To remove the panel, remove the bolts on the panel edge.
TASK 55-30-10-404-003
3. Panel Installation__________________
A. Consumable Materials
(1)
B00184 Solvent - Presealing Cleaning, BMS 11-7
(2)
A00099 Sealant - BMS 5-95
(3)
B00624 Compound - Lubricant BMS 3-28
B. References
(1) AMM 20-51-01/201, Standard Torque Values
C. Access
(1) Location Zone
320 Vertical Stabilizer
330 Horizontal Stabilizer, Left
340 Horizontal Stabilizer, Right
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747-400 MAINTENANCE MANUAL
D. Procedure
S 424-004
(1) Install the panel.
(a)
If you use the same panel, remove the sealant from the lower surface of the panel edge.
(b)
Put the aft and forward panel edge into their positions between the adjacent honeycomb panel and the panel stiffener.
(c)
Make sure that you put the panel in the center of the opening before you install the screws.
(d)
Apply BMS3-28 lubricant to the fasteners prior to installation (AMM 20-51-01/201).
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