Installation of the Transmitter Receiver Unit

TASK 34-41-51-400-001-A
Installation of the Transmitter Receiver Unit

CAUTION: WHEN YOU REMOVE OR INSTALL THE TRANSMITTER RECEIVER UNIT, BE CAREFUL NOT TO HIT THE LOCALIZER ANTENNA. THE CLEARANCE BETWEEN THE RADAR ANTENNA ASSEMBLY AND THE LOCALIZER ANTENNA IS SMALL.

ZONE: 110
FIN: 13SQ1 ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE
No specific	AR	CAP - BLANKING
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 0.40 and 0.34 m.daN (35.40 and 30.09 lbf.in )

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
110	RADOME (NOSE CONE TO FR 1)

C. Referenced Information

REFERENCE	DESIGNATION
TASK 34-41-00-740-002-A	BITE Test of the Weather Radar
TASK 53-15-11-010-001-A	Opening of the Radome
TASK 53-15-11-410-001-A	Closing of the Radome
Transmitter Receiver Unit (TRU)

3. Job Set-up
Subtask 34-41-51-860-051-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the WARNING NOTICE(S), 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 5M (16 FT)- ADJUSTABLE is in position in zone 110 below the radome.
(3) Make sure that the radome 110AL is open (Ref. AMM TASK 53-15-11-010-001).

Subtask 34-41-51-865-051-A ** ON A/C NOT FOR ALL

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	COM NAV/RADAR/1	5SQ1	K13

4. Procedure
Subtask 34-41-51-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the Transmitter Receiver Unit (TRU)
(1) Do a visual inspection and clean the component interface and/or the adjacent area.
(2) Install the TRU (3) in the weather-radar antenna drive-unit (1).

NOTE: The retainer springs hold the TRU in position.

(3) Install the two captive screws (4) to attach the TRU (3).
(4) TORQUE the screws (4) to between 0.40 and 0.34 m.daN (35.40 and 30.09 lbf.in )

(5) Remove the CAP - BLANKING from the electrical connectors. Make sure that the electrical connectors are clean and in the correct condition.
(6) Connect the electrical connector (2) to the smaller connector on the TRU (3).
(7) Connect the electrical connector (5) to the larger connector on the TRU (3).

Subtask 34-41-51-865-052-A ** ON A/C NOT FOR ALL

B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	COM NAV/RADAR/1	5SQ1	K13

Subtask 34-41-51-740-050-A ** ON A/C NOT FOR ALL

C. Do the BITE test of the weather radar (Ref. AMM TASK 34-41-00-740-002).

5. Close-up
Subtask 34-41-51-410-050-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tool(s) and other items.
(2) Close the radome 110AL (Ref. AMM TASK 53-15-11-410-001).
(3) Remove the ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE.
(4) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.02 07:15:06 UTC