Installation of the Emergency Locator Transmitter (ELT) Antenna

TASK 25-65-14-400-001-A
Installation of the Emergency Locator Transmitter (ELT) Antenna

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

ZONE: 200
FIN: 112MX ** 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	2	ACCESS PLATFORM 6M (20 FT)
No specific	2	SCRAPER - NON METALLIC
No specific	2	STEPLADDER 1.0 M (3.3 FT)
No specific	AR	TAPE - MASKING
No specific	Torque wrench: range to between 0.50 and 0.40 m.daN (44.25 and 35.40 lbf.in )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.04QAB2)	Coating_- Flexible Structure
(Material No.04TMB2)	Varnish-- Electrical Bonding Structure
(Material No.06AAB1)	Polysulfide Sealant-General Purpose Fillet -
(Material No.06AEB2)	Polysulfide Sealant-Low Adhesion Fillet Structure
(Material No.08BAA9)	Non Aqueous Cleaner-General - -
(Material No.14DBB1)	Release Agent-- Liquid Wax -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
200	UPPER HALF FUSELAGE
261BC

D. Referenced Information

REFERENCE	DESIGNATION
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A	De-energize the Ground Service Network Supplied from the External Power
TASK 25-23-42-000-002-A	Removal of the Ceiling Panels - Aft Utility Area
TASK 25-23-42-400-002-A	Installation of the Ceiling Panels - Aft Utility Area
TASK 25-65-00-740-001-A	Emergency Locator Transmitter (ELT) System - BITE Test
Antenna 112MX ** ON A/C NOT FOR ALL
Antenna 112MX ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 25-65-14-860-051-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the ground service network is energized
(Ref. AMM TASK 24-42-00-861-001).
(2) In the cabin:
(a) Make sure that ceiling panel 261BC (Ref. AMM TASK 25-23-42-000-002) is removed.
(b) Make sure that a STEPLADDER 1.0 M (3.3 FT) is in position below the antenna.
(3) At the antenna:
(a) Make sure that an ACCESS PLATFORM 6M (20 FT) is in position below the antenna.

Subtask 25-65-14-860-051-J ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the ACCESS PLATFORM 6M (20 FT) is in position at the antenna.

4. Procedure
Subtask 25-65-14-914-050-A ** ON A/C NOT FOR ALL

CAUTION: AT OR BEFORE THE END OF THE APPLICABLE TIME LIMIT (3 OR 10 DAYS), IT IS NECESSARY TO DO THE FULL INSTALLATION:

REMOVE THE ANTENNA
CLEAN THE FUSELAGE AND ANTENNA SURFACES AND REMOVE ALL SIGNS OF HUMIDITY
INSTALL THE ANTENNA WITH FULL INSTALLATION OF THE SEALANT.

IF YOU DO NOT DO THIS, THERE IS A RISK OF WATER INFILTRATION AND CORROSION.

A. Aircraft Antenna Sealant-Exemption
The table that follows gives the time limits for sealant installation for each radio-navigation, surveillance and communication antenna.
These limits are adapted to:

Antenna installation configuration
Antenna location
Antenna sensitivity to water infiltration
Sealant availability.

(1) Configuration of antenna installation:

Sealant between the antenna and the fuselage (interposition sealant)
Plus sealing bead around the antenna
Plus sealant on the heads of the screws
Plus O-ring at the antenna connector level.

(2) If the airline has sealant but does not want to wait until the sealant is cured:

Authorization to fly up to 10 days without sealing bead around the antenna if the interposition sealant was applied and the O-ring installed.
Authorization to fly up to 10 days without sealant on the heads of the screws.

(3) If the airline has no sealant available:

Authorization to fly up to 3 days without sealant (interposition sealant plus sealing bead plus sealant on the head screws) if the O-ring is installed.

Subtask 25-65-14-160-050-A ** ON A/C NOT FOR ALL

B. Cleaning Preparation for Installation

Antenna 112MX ** ON A/C NOT FOR ALL

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

(1) Remove unwanted material from the interface between the antenna (2) and the outer surface of the fuselage (5) with a SCRAPER - NON METALLIC.
(2) Clean the work area:

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

(a) Clean the interface between the antenna (2) and the outer surface of the fuselage with Non Aqueous Cleaner-General - - (Material No.08BAA9) and a Textile-Lint free Cotton - (Material No.14SBA1) .
(b) Make sure that the work area is dry before you continue.
(3) Do an inspection of the component interfaces and the adjacent area.
(4) Make sure that there is no paint, corrosion or sealants in the screw holes for the antenna (2).

NOTE: This is necessary because the antenna electrical bonding is made through the antenna screws (1).

(5) Apply TAPE - MASKING to these areas:

On the outer surface of the fuselage (5), around the interface with the antenna (2).
On the holes for the antenna connector (3) and for the screws (2).
Around the contour of the antenna (2) where sealants are not necessary.

Subtask 25-65-14-420-051-A ** ON A/C NOT FOR ALL

C. Installation of the Antenna

Antenna 112MX ** ON A/C NOT FOR ALL

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

(1) At the antenna:
(a) Apply materials:

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

1 Apply Release Agent-- Liquid Wax - (Material No.14DBB1) on the outer surface of the antenna (2) that will touch the fuselage (5).
2 Apply Polysulfide Sealant-Low Adhesion Fillet Structure (Material No.06AEB2) on the outer surface of the fuselage (5) that will touch with the antenna (2).
(b) Remove the masking tape from the holes for the antenna connector (3) and for the srews (2).
(c) Remove the CAP-BLANKING from each electrical connector and receptacle.
(d) Make sure that all the electrical connections are clean and in the correct condition.
(e) Make sure that the O-ring seal (4) (RAYAN P/N 2909) is in a correct and serviceable condition.
(f) Install the O-ring seal (4).
(g) Put the antenna (2) on the outer surface of the fuselage (5) and install the screws (1).
(h) TORQUE the screws (1) to between 0.50 and 0.40 m.daN (44.25 and 35.40 lbf.in )

.
(i) Remove unwanted sealant with a SCRAPER - NON METALLIC.
(j) Remove unwanted masking tape.
(k) Clean the work area:

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

1 Clean the work area with Non Aqueous Cleaner-General - - (Material No.08BAA9) and Textile-Lint free Cotton - (Material No.14SBA1) .
(l) Make sure that the bonding resistance between the antenna (2) and the surface of the fuselage (5) is not more than 5 milliohms (Ref. AMM TASK 20-28-00-912-802).
(2) In the cabin:
(a) Connect the antenna connector (3) to the antenna (2).
(b) Pull the heat protective webbing fully over the antenna connector (3) and make sure that it is flush with the fuselage ceiling.
(c) Set the toggle switch of the ELT to the ARMED position.

Subtask 25-65-14-160-050-J ** ON A/C NOT FOR ALL

D. Cleaning Preparation for Installation

Antenna 112MX ** ON A/C NOT FOR ALL

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

(1) Remove old material from the antenna (2) interface and the outer surface of the fuselage (5) with a SCRAPER - NON METALLIC.
(2) Clean the area:

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

(a) Clean the antenna (2) interface and the outer surface of the fuselage with Non Aqueous Cleaner-General - - (Material No.08BAA9) and a lint-free cotton cloth Textile-Lint free Cotton - (Material No.14SBA1) .
(b) Make sure that the area is dry before you continue.
(3) Do an inspection of the component interfaces and the adjacent area.
(4) Make sure that there is no paint, corrosion or sealants in the screw holes of the antenna (2).

NOTE: This is necessary because the antenna electrical bonding is made through the antenna screws (1).

(5) Mask these areas with TAPE - MASKING:

On the outer surface of the fuselage (5), around the area that interfaces with the antenna (2).
On the screw holes and the hole for the connector, in the fuselage structure.
Around the edge of the antenna (2) where sealants are not necessary.

Subtask 25-65-14-420-051-J ** ON A/C NOT FOR ALL

E. Installation of the Antenna 112MX

Antenna 112MX ** ON A/C NOT FOR ALL

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

(1) Apply materials:

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

(a) Apply Release Agent-- Liquid Wax - (Material No.14DBB1) on the interface of the antenna (2).
(b) Apply Polysulfide Sealant-Low Adhesion Fillet Structure (Material No.06AEB2) on the outer surface of the fuselage (5), that interfaces with the antenna (2).
(2) Remove the masking tape from the screw holes and the hole for the connector.
(3) Remove the CAP-BLANKING from each electrical connector and receptacle.
(4) Make sure that all the electrical connections are clean and in the correct condition.
(5) Install the O-ring seal (4):
(a) Make sure that the O-ring seal (4) (RAYAN P/N 2909) is in a correct and serviceable condition.
(6) Connect the connector (3) to the antenna (2).
(7) Put the antenna (2) on the outer surface of the fuselage, and install the screws (1).
(8) Tighten the screws (1) and TORQUE to between 0.50 and 0.40 m.daN (44.25 and 35.40 lbf.in )

.
(9) Remove unwanted sealant with a nonmetallic scraper.
(10) Remove unwanted masking tape.
(11) Clean the area:

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

(a) Clean with Non Aqueous Cleaner-General - - (Material No.08BAA9) , and a lint-free cotton cloth Textile-Lint free Cotton - (Material No.14SBA1) .
(12) Make sure that the bonding resistance between the antenna (2), and the surface of the fuselage is not more than 5 milliohms (Ref. AMM TASK 20-28-00-912-802).

Subtask 25-65-14-740-050-A ** ON A/C NOT FOR ALL

F. Do the BITE test (Ref. AMM TASK 25-65-00-740-001).

Subtask 25-65-14-740-050-J ** ON A/C NOT FOR ALL

F. Do the BITE test (Ref. AMM TASK 25-65-00-740-001).

Subtask 25-65-14-370-050-A ** ON A/C NOT FOR ALL

G. Application and Curing of Sealants

Antenna 112MX ** ON A/C NOT FOR ALL

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

(1) Apply materials:

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

(a) Apply a bead of Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) around the bottom edge of the antenna (2) and on the heads of the screws (1).
(b) Make a smooth contour of the sealant around the bottom edge of the antenna (2) and the heads of the screws (1).
(c) Let the sealants become hard.
(d) Apply Coating_- Flexible Structure (Material No.04QAB2) on the sealant around the bottom edge of the antenna (2).
(e) Apply Varnish-- Electrical Bonding Structure (Material No.04TMB2) on the sealant on the heads of the screws (1).

Subtask 25-65-14-370-050-J ** ON A/C NOT FOR ALL

G. Application and Curing of Sealants

Antenna 112MX ** ON A/C NOT FOR ALL

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

(1) Apply materials:

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

(a) Apply a bead of Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) around the bottom edge of the antenna (2) and on the heads of the screws (1).
(b) Make a smooth contour of the sealant around the bottom edge of the antenna (2) and the heads of the screws (1).
(c) Let the sealants get hard.
(d) Apply Coating_- Flexible Structure (Material No.04QAB2) on the sealant around the bottom edge of the antenna (2).
(e) Apply Varnish-- Electrical Bonding Structure (Material No.04TMB2) on the sealant on the heads of the screws (1).

5. Close-up
Subtask 25-65-14-942-050-A ** ON A/C NOT FOR ALL

A. Close Access
(1) In the cabin:
(a) Install ceiling panel 261BC (Ref. AMM TASK 25-23-42-400-002).
(b) Remove the STEPLADDER 1.0 M (3.3 FT).
(2) At the antenna:
(a) Remove the ACCESS PLATFORM 6M (20 FT).
(3) Make sure that the work area is clean and clear of tools and other items.
(4) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

Subtask 25-65-14-942-050-J ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the access platform(s).
(3) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

Subtask 25-65-14-862-051-A ** ON A/C NOT FOR ALL

B. De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).

[Rev.10 from 2021] 2026.03.31 23:41:13 UTC