Removal of the Weather-Radar Antenna Assembly

TASK 34-41-11-000-802-A
Removal of the Weather-Radar Antenna Assembly

WARNING: MOVE THE RADAR ANTENNA ASSEMBLY CAREFULLY TO PREVENT INJURY TO PERSONS AND DAMAGE TO EQUIPMENT. THE RADAR ANTENNA ASSEMBLY (ANTENNA/DRIVE) WEIGHS APPROXIMATELY 15kg (33lb).

CAUTION: DO NOT USE THE LOCALIZER ANTENNA AT THE BOTTOM OF THE RADOME AS A SUPPORT.

ZONE: 110
FIN: 11SQ ** ON A/C NOT FOR ALL
FIN: 7SQ ** 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	1	ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE
No specific	1	BAG - PLASTIC
No specific	AR	CAP - BLANKING
No specific	1	CONTAINER - CLEAN, APPLICABLE
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	WARNING NOTICE(S)

B. Work Zones and Access Panels

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

C. Referenced Information

REFERENCE	DESIGNATION
TASK 53-15-11-010-001-A	Opening of the Radome
Weather-Radar Antenna Assembly ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 34-41-11-865-085-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
** ON A/C NOT FOR ALL
121VU	COM NAV/RADAR/2	5SQ2	K14

Subtask 34-41-11-010-061-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 below the radome at zone 110.
(3) Open radome 110AL (Ref. AMM TASK 53-15-11-010-001).

4. Procedure
Subtask 34-41-11-020-074-A ** ON A/C NOT FOR ALL

A. Removal of the Weather Radar Antenna
(1) One person must hold the antenna during its removal.

WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.

(2) Remove and discard the lockwire and loosen the bolts (14).
(3) Remove the antenna (17) and put it in the BAG - PLASTIC and in the CONTAINER - CLEAN, APPLICABLE.

Subtask 34-41-11-020-075-A ** ON A/C NOT FOR ALL

B. Removal of the Weather-Radar Antenna Assembly

NOTE: Two persons are necessary for the removal of the antenna drive. One person holds the antenna drive and the other person removes all the bolts.

(1) Disconnect the electrical connector (11).
(2) Loosen the quick-disconnect clamp (8) and disconnect the wave guide (4) from the antenna drive (1).
(3) Remove and discard the O-ring (3).
(4) Put CAP - BLANKING on the disconnected connectors (11) and (12), and on the flange of the wave guide (4).
(5) Remove the bottom bolts (10) and the washers (9).
(6) Loosen the top bolts (5) and the washers (6), but do not remove them.
(7) Lift the antenna drive (1) until the holes (2) are at the same level as the top bolts (5) and then pull it carefully.
(8) Remove the antenna drive (1) and put it in a plastic bag and in a correct container.

[Rev.10 from 2021] 2026.04.01 01:01:06 UTC