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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
(f) Torque the four support bolts for the transfer plate to 160-180 pound-inches.
S 972-018
(6) Measure the airplane pitch and roll at the reference transfer location:
NOTE: Make sure the digital protractor on the reference plate and
____
the transfer plate is turned in the same direction.
Look to see if the digital protractor reads a minus or plus angle or it reads an up or down directional arrow.
(a) LUCAS ANGLE STAR DP-60; Push the ALT REF switch on the digital protractor to operate in the normal (gravity reference) mode.
NOTE: Use the digital protractor in one mode, either the
____ normal or alternate reference (ALT REF) mode, through the entire adjustment.
Use the same measure scale through the full adjustment. The procedure that follows is written in the usual mode of operation.
(b)
Set the digital protractor on the reference plate to read pitch (Fig. 201).
(c)
Set the ON/OFF switch on the digital protractor to ON.
(d)
KERR STROM PRO 3600; Make sure the digital protractor has been in position for five seconds before reading the display.
(e)
Push the ALT REF switch on the digital protractor to operate in the normal (gravity reference) mode.
NOTE: Use the digital protractor in one mode, either the
____ normal or alternate reference (ALT REF) mode, through the entire adjustment.
Use the same measure scale through the full adjustment. The procedure that follows is written in the usual mode of operation.
(f)
Read and record the plus or minus pitch value on the digital protractor.
(g)
Set the digital protractor on the reference plate to read roll (Fig. 201).
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747-400 MAINTENANCE MANUAL
(h)
KERR STROM PRO 3600; Make sure the digital protractor has been in position for five seconds before reading the display.
(i)
Read and record the plus or minus roll value on the digital protractor.
(j)
LUCAS ANGLE STAR DP-60; Keep the ON/OFF switch on the digital protractor in the ON position.
S 822-020
(7) Adjust the WXR antenna mount to the airplane pitch value:
NOTE: Make sure the digital protractor on the transfer plate
____ is in the same direction as on the reference plate.
(a)
Loosen the six pitch bolts that hold the WXR antenna mount to the radome structure.
(b)
Make clean the measure surfaces on the transfer plate with a lint-free dry cloth.
(c)
Put the digital protractor on the pitch measure surface of the reference plate.
(d)
KERR STROM PRO 3600; Make sure the digital protractor has been in position for five seconds before reading the display.
(e)
Move the WXR antenna mount slowly in pitch until the value is within | 0.10 degree of the reference plate value.
NOTE: With Kell Strom Pro 3600, each time the antenna is
____ moved, do not read the protractor display until the protractor has been in position for 5 seconds.
(f)
Carefully tighten the two top and two bottom pitch adjustment bolts to a value of 50 to 80 pound-inches.
(g)
Do a check of the digital protractor pitch value.
1) The pitch value must be within the reference plate value | 0.10 degree.
(h)
Tighten the two pitch pivot bolts to a value of 50 to 80 pound-inches.
S 822-021
(8) Adjust the WXR antenna mount to the airplane roll value:
NOTE: Make sure the digital protractor on the transfer plate
____ is in the same direction as on the reference plate.
(a)
Loosen the two bottom and the top center roll adjustment bolts on the WXR antenna mount.
(b)
Make clean the measurement surfaces on the transfer plate with a lint-free dry cloth.
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