(4)
 On the flange (11) (RT reference), install a new O-ring (16).

 (5)
 Put the adaptor (12) in position with the arrow which points in the direction of the mounting tray.

 (6)
 Install the flange (11) with the four washers (17) and the four screws (18). TORQUE the screws to between 0.19 and 0.21 m.daN (16.81 and 18.58 lbf.in) and install the lockwire.

 (7)
 Make sure that the pressurization hole in the wave guide is clean.

 Subtask 34-41-41-865-052
 F. Remove the safety clip(s) and the tag(s) and close this(these) circuit
 breaker(s): R 5SQ1, 5SQ2
 Subtask 34-41-41-710-050
 G. Test
 WARNING : MAKE SURE THAT:
_______ -ALL PERSONS ARE MORE THAN 5 METERS (16.4FT) FROM THE ANTENNA. -NO PERSON IS IN THE AREA MADE BY AN ARC OF 135. ON EACH SIDE OF THE AIRCRAFT CENTERLINE. -THERE IS A MINIMUM SAFETY DISTANCE OF 5 METERS (16.4FT) BETWEEN THE AIRCRAFT AND ANY OBSTACLE IN THE AREA MADE BY AN ARC OF 90. ON EACH SIDE OF THE AIRCRAFT CENTERLINE.
 (1)
 Make sure that all wave guide parts are correctly installed.

 (2)
 Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002).

 1EFF : ALL 1 34-41-41Page 410 1 1 May 01/05 1 1 1CES 1

 (3)
 Do the EIS start procedure (ND only) (Ref. TASK 31-60-00-860-001).

 (4)
 On the ADIRS CDU, on the panel 20VU:

 -set the three OFF/NAV/ATT selector switches to NAV.

 (5)
 On the center pedestal, on the weather radar control unit, set the system to ON.

 (6)
 Make sure that the system operates normally: on the ND, the weather radar display is shown.

 (7)
 On the weather radar control unit, set the system to OFF.

 5. Close-up
________ Subtask 34-41-41-860-052
 A. Put the aircraft back to its initial configuration.
 (1)
 Do the EIS Stop Procedure (ND only)(Ref. TASK 31-60-00-860-002).

 (2)
 On the ADIRS CDU set the OFF/NAV/ATT selector switches to OFF.

 (3)
 Make sure that the work area is clean and clear of tool(s) and other items.

 (4)
 De-energize the aircraft electrical circuits (Ref. TASK 24-41-00-862-002).

 (5) Remove the warning notice(s). Subtask 34-41-41-410-050
 B. Close Access
 (1)
 Close the access door 811.

 (2)
 Close the radome 110AL (Ref. TASK 53-15-11-410-001).

 (3)
 Remove the access platform(s).

 1EFF : ALL 1 34-41-41Page 411 1 1 Feb 01/98 1 1 1CES 1 RADIO ALTIMETER - DESCRIPTION AND OPERATION

___________________________________________
 1. General
_______
 The function of the radio altimeter (RA) is to determine the height of the
 aircraft above the terrain.
 One of the main characteristics of the system is that it locks onto the
 leading edge of the reflected wave. This permits to measure the distance
 between the aircraft and the nearest obstacle. The radio altimeter can
 therefore operate over non-flat ground surface.
 2. Component Location
__________________
 **ON A/C 001-049, 051-099, 101-149, 201-299,
 (Ref. Fig. 001)

R **ON A/C 151-199, 401-499,
 (Ref. Fig. 001A)
 **ON A/C 301-399,
 (Ref. Fig. 001B)
 **ON A/C ALL
 -------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF.
 -------------------------------------------------------------------------------2SA1 XCVR-RA, 1 152 826 34-42-33 2SA2 XCVR-RA, 2 152 826 34-42-33 3SA1 FAN-RA XCVR 1 152 826 34-42-45 3SA2 FAN-RA XCVR 2 152 826 34-42-45 5SA1 ANTENNA-RA RCPTN, 1 153 34-42-11 5SA2 ANTENNA-RA RCPTN, 2 153 34-42-11 6SA1 ANTENNA-RA XMSN, 1 153 34-42-11 6SA2 ANTENNA-RA XMSN, 2 153 34-42-11
 1EFF : ALL 1 34-42-00Page 1 1 1 Aug 01/05 1 1 1CES 1

 Radio Altimeter - Component Location
 Figure 001

R 1EFF : 001-049, 051-099, 101-149, 201-299, 1 34-42-00Page 2 1 1 May 01/05 1 1 1CES 1

 Radio Altimeter - Component Location
 Figure 001A

R 1EFF : 151-199, 401-499, 1 34-42-00Page 3 1 1 Aug 01/05 1 1 1CES 1

R  Radio Altimeter - Component Location 
R  Figure 001B 
R 1EFF :  301-399,  1  34-42-00 Page 4 
1  1  May 01/04
 1  1
 1CES  1

 3. System Description__________________ 
　
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