S 864-027
(1) Open these circuit breqakers and attach DO-NOT-CLOSE tags:
(a) P7 Overhead Circuit Breaker Panel
1) 7C7 WXR L RT
2) 7C19 WXR R RT
S 014-028
(2)
Open the nose radome (AMM 53-52-01/201).
S 024-029
(3)
Remove waveguide Section 1:
(a)
Remove the screws and washers from the flanges between waveguide Sections 1 and 2.
(b)
Release the quick disconnect that holds the waveguide Section 1 to the antenna waveguide.
(c)
Remove the screw, nut, and the support clamp from waveguide Section 1.
(d)
Remove waveguide Section 1 and gaskets.
S 024-117
(4) Put dust caps on the waveguide flanges.
D. Waveguide Section 2 Removal.
NOTE: To remove waveguide section 2, access is necessary
____ to get into the nose radome and below the compartment floor in the nose cargo door section.
S 864-031
(1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a) P7 Overhead Circuit Breaker Panel
1) 7C7 WXR L RT
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747-400 MAINTENANCE MANUAL
2) 7C19 WXR R RT
S 014-032
(2)
Open the nose radome (AMM 53-52-01/201).
S 014-236
(3)
Get access to section 2 below the compartment floor:
(a) Release the 18 fasteners that hold the cargo floor panel.
WARNING: STEP ONLY ON THE FLOOR BEAMS WHEN YOU REMOVE CARGO FLOOR
_______ PANEL. THE FLOOR PANELS BETWEEN THE BEAMS CAN FLEX AND CAUSE YOU TO FALL. IF YOU DO NOT OBEY THESE INSTRUCTIONS, INJURY TO PERSONNEL AND/OR DAMAGE TO THE WEATHER RADAR EQUIPMENT OR BLANKET MATERIAL CAN OCCUR.
WARNING:_______THE CARGO FLOOR PANEL IS HEAVY. TO PREVENT INJURY, TWO PEOPLE ARE REQUIRED WHEN LIFTING OR MOVING THE CARGO FLOOR PANEL.
CAUTION: DO NOT PUSH OR PULL THE CARGO FLOOR PANEL ACROSS THE FLOOR
_______ BEAMS. THIS ACTION CAN CAUSE DAMAGE TO THE BLANKET MATERIAL.
(b) Carefully remove the cargo floor panel.
S 024-034
(4) Remove waveguide Section 2:
(a)
Remove screws and lockwashers from flanges between sections 1 and 2.
(b)
Remove eight screws from bulkhead flange.
(c)
Remove screws and lockwashers from flanges between sections 2 and 3.
(d)
Remove two screws, two nuts and four washers that hold the aft waveguide tab to the aft support bracket.
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747-400 MAINTENANCE MANUAL
(e)
Remove two screws, two nuts and four washers that holds the forward waveguide tab to the forward support bracket.
(f)
Support section 2 and carefully pull section 2 forward through the hole in bulkhead.
(g)
Remove waveguide Section 2 and gaskets.
S 024-118
(5) Put dust caps on waveguide flanges.
E. Waveguide Section 3 Removal
NOTE: To remove waveguide Section 3, it is necessary to get into the
____ nose radome and below the compartment floor in the nose cargo door.
S 864-036
(1) Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a) P7 Overhead Circuit Breaker Panel
1) 7C7 WXR L RT
2) 7C19 WXR R RT
S 014-238
(2) Get access to section 3 below the compartment floor:
(a) Release the 18 fasteners that hold the cargo floor panel.
WARNING: STEP ONLY ON THE FLOOR BEAMS WHEN YOU REMOVE CARGO FLOOR
_______ PANEL. THE FLOOR PANELS BETWEEN THE BEAMS CAN FLEX AND CAUSE YOU TO FALL. IF YOU DO NOT OBEY THESE INSTRUCTIONS, INJURY TO PERSONNEL AND/OR DAMAGE TO THE WEATHER RADAR EQUIPMENT OR BLANKET MATERIAL CAN OCCUR.
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