**ON A/C 001-049, 101-105, 151-199,
 34-41-11-991-001 Fig. 401 R **ON A/C 051-099, 106-149, 201-299, 301-399, 401-499,
 34-41-11-991-001-A Fig. 401A
 **ON A/C ALL
 3. Job Set-up
__________
 Subtask 34-41-11-860-051

 A. Aircraft Maintenance Configuration
 (1)
 Make sure that the warning notice, which tells persons not to operate the Weather Radar System, is in position in the cockpit on the center pedestal.

 (2)
 Make sure that the access platform is in position in zone 110 below the radome.

 (3)
 Make sure that the radome 110AL is open (Ref. TASK 53-15-11-010-001).

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 B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
 -------------------------------------------------------------------------------
PANEL DESIGNATION IDENT. LOCATION
 -------------------------------------------------------------------------------
121VU COM NAV/RADAR/1 5SQ1 K13
 **ON A/C 051-099,
 121VU COM NAV/RADAR/2 5SQ2 K14 **ON A/C ALL
 4. Procedure
_________
 **ON A/C 001-049, 101-105, 151-199,

 (Ref. Fig. 401/TASK 34-41-11-991-001) R **ON A/C 051-099, 106-149, 201-299, 301-399, 401-499,
 (Ref. Fig. 401A/TASK 34-41-11-991-001-A)
 **ON A/C 001-049, 101-105, 151-199,

 Subtask 34-41-11-420-056
 A. Installation of the Antenna Assembly
 (1)
 Clean the component interface and/or the adjacent area.

 (2)
 Do an inspection of the component interface and/or the adjacent area.

 (3)
 Make sure that the two top screws (6) are sufficiently loose.

 (4)
 Lift the antenna drive (13) up to its support and engage it in the two top screws (6).

 (5)
 Install the two bottom screws (10) and washers (9).

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 (6)
 Tighten the screws (6) and (10) with the washers (5) and (9).

 (7)
 Remove the blanking caps from the electrical connectors (11) and (12) and the flange of the wave guide (3).

 (8)
 Put the O-ring (4) in the correct position on the flange of the wave guide (3).

 (9)
 Connect the wave guide (3) to the antenna drive (13) with the quick disconnect clamp (2).

 (10) Connect the electrical connector(s) (11).
 Subtask 34-41-11-420-057

 B. Installation of the Antenna Plate
 NOTE : Two persons are necessary to do this work.

____
 (1)
 Attach the antenna (1) to the ring mount (17) with the screws (15) and the lockwashers (16).

 (2)
 Connect the flange of the wave guide (18) to the antenna (1).

 (3)
 Install the screws (20) and the lockwashers (19).

 (4)
 Make sure that the antenna assembly turns correctly in azimuth (AZ) and in elevation (EL).

 (5)
 Make sure that the locking device is installed on the EL and AZ switches (8) to prevent their operation.

R **ON A/C 051-099, 106-149, 201-299, 301-399, 401-499,
 Subtask 34-41-11-420-056-A
 A. Installation of the Antenna Assembly NOTE : Do not remove the transparent plastic windows that are installed:
____
 -
at the inlet of the antenna drive, and

 -
at the interface between the antenna drive, and the antenna plate.

 (1)
 Clean the component interface and/or the adjacent area.

 (2)
 Do an inspection of the component interface and/or the adjacent area.

 (3)
 Make sure that the two top screws (8) are sufficiently loose.

 (4)
 Lift the antenna drive (2) up to its support (9) and engage it in the two top screws (8).

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 (5)
 Install the two bottom screws (11) and the washers (10).

 (6)
 Attach the antenna drive (2). To do this, tighten the screws (8) and

 (11) with the washers (7) and (10).

 (7)
 Remove the blanking caps from the electrical connectors (12) and (13), and from the flange of the wave guide (5).

 (8)
 Put the O-ring (4) in the correct position on the wave guide (3).

 (9)
 Connect the wave guide (5) to the antenna drive (2) with the quick disconnect of the wave guide (3).
　
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