Removal of the Transmitter Receiver Unit

TASK 34-41-51-000-001-A
Removal 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	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

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

C. Referenced Information

REFERENCE	DESIGNATION
TASK 53-15-11-010-001-A	Opening of the Radome
Transmitter Receiver Unit (TRU)

3. Job Set-up
Subtask 34-41-51-865-050-A ** ON A/C NOT FOR ALL

A. Open, safety and tag this(these) circuit breaker(s):

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

Subtask 34-41-51-010-050-A ** ON A/C NOT FOR ALL

B. Get Access
(1) In the cockpit, put a WARNING NOTICE(S) on the center pedestal, to tell persons not to operate the weather radar system.
(2) Put the ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE in position in zone 110 below the radome.
(3) Open the radome 110AL (Ref. AMM TASK 53-15-11-010-001).

4. Procedure
Subtask 34-41-51-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the Transmitter Receiver Unit (TRU)
(1) Disconnect the electrical connectors (2) and (5) from TRU (3).
(2) Put CAP - BLANKING on the disconnected electrical connectors (2) and (5).
(3) Loosen the two captive screws (4) from the TRU (3).

NOTE: The TRU will move down a small distance. The retainer springs hold the TRU in position.

(4) Remove the TRU (3) from the weather-radar antenna drive-unit (1).
(5) Put the TRU (3) in a correct container.

[Rev.10 from 2021] 2026.04.02 07:15:05 UTC