25-58-05
ALL ú ú 04 Page 405 ú Oct 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
MAIN DECK CARGO BARRIER NETS - REMOVAL/INSTALLATION
___________________________________________________
1. General_______
A. This procedure contains these tasks:
(1)
A removal of the cargo barrier net.
(2)
A removal of the cargo barrier strap.
(3)
An installation of the cargo barrier net.
(4)
An installation of the cargo barrier strap.
B. The cargo barrier net is at station 720 and is above the ceiling panels.
C. The function of the cargo barrier net is to give protection to the occupants in the upper deck from cargo loads over ten feet high.
D. The cargo barrier strap is at station 770.
E. The function of the cargo barrier strap is to stop any pallet or container higher than 8 feet from going forward.
TASK 25-58-06-004-076
2. Cargo Barrier Net Removal (Fig. 401)_________________________
A. Access
(1) Location Zones
231 Main Deck Body Sta 488 to 854, Left
232 Main Deck Body Sta 488 to 854, Right
B. Procedure
S 014-070
(1)
Remove the contoured ceiling panel to get access to the net.
(2)
Remove the sidewall panels.
S 034-068
(3)
Release the tie-back straps on the left and right sides to release the tension of the cargo barrier net.
(4)
Remove the bolts that attach the straps to the floor beam fittings.
S 014-071
S 034-069
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25-58-06
ALL ú ú 07 Page 401 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
S 034-072
(5)
Remove the bolts that attach the straps to the side attachment fittings.
S 034-073
(6)
Remove the bolts that attach the straps to the upper support attachment fittings.
S 024-074
(7)
Remove the net.
TASK 25-58-06-004-080
3. Cargo Barrier Strap Removal (Fig. 402)___________________________
A. Access
(1) Location Zones 231 Main Deck Body Sta 488 to 854, Left 232 Main Deck Body Sta 488 to 854, Right 233 Area Aft of Upper Deck Body Sta 632 to 860, Left 234 Area Aft of Upper Deck Body Sta 632 to 860, Right
B. Procedure
S 034-077
(1)
Remove the quick-release pins that attach the straps to the upper supports.
S 034-078
(2)
Remove the bolts that attach the straps to the side supports.
S 024-079
(3)
Remove the strap.
TASK 25-58-06-404-082
4. Cargo Barrier Net Installation (Fig. 401)______________________________
A. Access
(1) Location Zones 231 Main Deck Body Sta 488 to 854, Left 232 Main Deck Body Sta 488 to 854, Right 233 Area Aft of Upper Deck Body Sta 632 to 860, Left 234 Area Aft of Upper Deck Body Sta 632 to 860, Right
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25-58-06
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL
STRAP ATTACHMENT SEE A
STRAP TIEBACK 1 STRAP TIEBACK 1
FLOOR BEAM
ATTACHMENT TIEBACK STRAP
ATTACHMENT
SEE B
SEE C
SIDE
ATTACHMENT
FITTING
BARRIER NET
BOLT
STRAP FWD
STRAP ATTACHMENT
(EXAMPLE)
A
NOTE: HAND TIGHTEN TIE-BACK STRAPS TO APPROXIMATELY
1____ 30 POUNDS TENSION TO HOLD NET IN POSITION SO MINIMUM CLEARANCE OF 0.5 INCH FROM CONTROL CABLES IS MAINTAINED.
Cargo Barrier Net Installation Figure 401 (Sheet 1)
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