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A
747-400
MAINTENANCE MANUAL

 (c)  Put the digital protractor on the roll 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 roll until the value is
 within | 0.10 degree of the reference plate value.
 (f)  Move the WXR antenna mount slowly in roll 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.
 (g)  Carefully tighten the two bottom and top center roll adjustment
 bolts to a value of 50 to 80 pound-inches.
 (h)  Do a check of the digital roll value.
 1) The roll value must be within the reference plate value
 | 0.10 degree.
 (i)  Set the ON/OFF switch on the digital protractor to OFF.
 (j)  Remove the digital protractor from the transfer plate.
 (k)  Remove the transfer plate from the WXR antenna mount.
 1) Remove the two bottom transfer plate bolts from the WXR
 antenna mount.
 2) Loosen the two top support bolts.
 3) Remove the transfer plate from the WXR antenna mount.
 (l)  Tighten the top left and top right roll adjustment bolts to a
 value of 50 to 80 pound-inches.

 S 082-022
 (9)  
Remove the two top antenna support bolts and washers, which are part of the G34004 transfer plate, from the WXR antenna mount.

 S 412-023

 (10)
 Install the two top antenna support bolts and washers into the WXR antenna mount.

 S 082-018

 (11)
 Remove test equipment from the airplane:

 (a)  
Put the four transfer plate bolts with washers into the holes supplied in the transfer plate.

 (b)  
Remove the reference plate from the reference transfer points between STA 1460 and 1480 and LBL 20.50 and 29.50.

 S 412-019
 (12) Install the equipment that follows between STA 1460 and 1480 and BLB 20.50 and 29.50.
 (a)  
Install the floor panels (AMM 53-21-02/401).

 (b)  
Install the passenger seats (AMM 25-25-01/401).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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MAINTENANCE MANUAL

 TRAFFIC ALERT AND COLLISION AVOIDANCE SYSTEM (TCAS) - DESCRIPTION & OPERATION
_____________________________________________________________________________
 1.  General
_______
 A.  The Traffic Alert and Collision Avoidance System (TCAS) keeps surveillance on proximate airplane traffic and supplies safe separation between your airplane and other airplanes, that have ATCRBS or Mode S transponders, in the event of flight path conflict.
 B.  One TCAS system is installed on the airplane. The TCAS system consists of one TCAS computer, two phased array directional antenna, and a control unit (ATC control panel). TCAS information is shown on the Primary Flight Display and Navigation Display.
 C.  TCAS interrogates proximate airplanes and receives the altitude, bearing and other data from the intruder airplane via Air Traffic Control (ATC) system. The TCAS computer will analyze the data and determine if the intruder airplane pose a threat to your airplane. If there is a potential threat, TCAS will issue resolution advisories which will instruct the pilot to avoiding the conflict. If there is no threat the TCAS will track the intruder airplane's position.
 D.  TCAS operates in two modes: TA ONLY mode which only tracks the proximate airplane traffic and TA/RA mode which tracks intruder airplanes and issue resolution advisories.
 E.  The TCAS uses this equipment (Fig. 1):
 F.  The basic Traffic Alert and Collision Avoidance System (TCAS) supplies safe separation between your airplane and other airplanes that have ATCRBS or Mode S Transponders.
　
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