Clampshell Type Clamp Installation
Figure 401
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747-400 MAINTENANCE MANUAL
TASK 20-11-24-404-005
3. Tubing Clamp - Installation___________________________
A. References
(1) AMM 20-51-01/201, Standard Torque Values
B. Consumable Materials
(1) G00145 Tape - Permacel P421
C. Procedure - Install Clampshell Type Clamps (Fig. 401)
S 424-006
(1) Hold the clampshell halves in their positions and install the clamp.
D. Procedure - Install the Block Clamp Assembly
S 214-003
(1) Make sure each tube is wound three times with P421 Tape, approximately 0.25 inch from the edge of the block.
NOTE: This tape is used to prevent too much clearance between
____ the tube and the clamp. Airplanes may not have this tape because the tube has not been in service long enough to be worn.
S 434-004
(2)
Put the tubes in the applicable notches in the block clamp assembly.
S 424-005
(3)
Put the other half of the block clamp assembly in its position.
S 434-006
(4)
Put the channel on the half of the block clamp assembly that the bolt head will touch.
(5)
Install the bolts through the holes in the block clamp assembly.
S 434-007
NOTE: Make sure the washers are on the bolts.
____
S 434-008
(6) Install the washer and nut on the bolt.
NOTE: Make sure the washers are below the bolt head and the nut.
____
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747-400 MAINTENANCE MANUAL
S 434-013
(7) Tighten the clamp (AMM 20-51-01/201).
TASK 20-11-24-404-010
4. Protective Lacing - Installation
A. Consumables
(1)
A00027 Adhesive - RTV 108 (used on nose landing gear only)
(2)
G00057 Tape - Scotch, 3M #63 (used on nose landing gear only)
(3)
G02503 Lace - Black Nylon Untreated Sleaving (1/8")
B.
Procedure - Install the Protective Lacing (Fig 402)
S 404-011
(1)
Install the lacing per Figure 402 , steps 1 through 3 , except nose landing gear.
S 404-012
(2)
Install the lacing on nose landing gear per Figure 402.
(a)
Prior to pulling locking lace through, before Step 3, apply adhesive to the laces.
(b)
Pull the laces into place, (Step 3), this will bond the laces in place.
(c)
Apply two layers of tape over the lacing. 1) Spirally wrap each layer with a 50% overlap and reverse the direction of the spiral with each layer.
2) Extend the tape 1.0 inch to 1.5 inch beyond each end of the lacing.
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747-400 MAINTENANCE MANUAL
HOSE OR CONDUIT
WOVEN NYLON SLEEVING
STEP 1
TEN WRAPS APPROXIMATELY
STEP 2
0.75 1.50
CUT OFF 0.25 MAX STEP 3 (LACING) OF THE SERVING FROM EITHER END TIE CAN BE MADE CUT OFF 0.25 MAX
FOR TWO OR MORE HOSES
NOTE: ALL DIMENSIONS ARE IN INCHES.
Protective Lacing Installation Figure 402
K03054
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