Installation of the Low Earth Orbit (LEO) Passive Antenna

TASK 23-28-13-400-802-A
Installation of the Low Earth Orbit (LEO) Passive Antenna

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

ZONE: 230
FIN: 1016RV1 ** 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 6M (20 FT) - ADJUSTABLE
No specific	1	SCRAPER - NON METALLIC
No specific	1	TAPE - MASKING
No specific	Torque wrench: range to between 35 and 30 lbf.in (0.40 and 0.34 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.04FEC2)	Primer Paint-Polysulfide Corrosion Inhibiting Structure
(Material No.06AAA1)	Polysulfide Sealant_General Purpose Brushable -
(Material No.06AAB1)	Polysulfide Sealant-General Purpose Fillet -
(Material No.06ABF1)	Polysulfide Sealant-Fuel Tank Quick Curing -
(Material No.08BAA9)	Non Aqueous Cleaner-General - -
(Material No.14DBB1)	Release Agent-- Liquid Wax -
(Material No.14QDB1)	Wire-Locking Dia: 0.5 mm (0.020 inch) CRES Nickel Alloy -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
230	FWD PASSENGER COMPARTMENT

D. Referenced Information

REFERENCE	DESIGNATION
TASK 20-28-00-912-802-A	Electrical Bonding - General Maintenance Procedure
TASK 23-28-00-740-001-A	BITE Test of the SATCOM system
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
LEO Passive Antenna

3. Job Set-up
Subtask 23-28-13-860-054-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

Subtask 23-28-13-865-077-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	SATCOM	240RV	K01

Subtask 23-28-13-941-060-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Make sure that the ACCESS PLATFORM 6M (20 FT) - ADJUSTABLE is in position at zone 230.

4. Procedure
Subtask 23-28-13-420-056-A ** ON A/C NOT FOR ALL

A. Installation of the LEO Passive Antenna

LEO Passive Antenna ** ON A/C NOT FOR ALL

(1) Do an inspection of the component interfaces and the adjacent area.
(2) Remove the used sealant from the fuselage structure (6) with the SCRAPER - NON METALLIC.
(3) Clean the component interface and/or the adjacent area with Non Aqueous Cleaner-General - - (Material No.08BAA9) and the Textile-Lint free Cotton - (Material No.14SBA1) .
(4) Apply Release Agent-- Liquid Wax - (Material No.14DBB1) at the bottom of the antenna (2).
(5) Remove the TAPE - MASKING from the coaxial connector (4) and the screw holes.
(6) Remove the blanking cap from the coaxial connector (4).
(7) Put the gasket (3) in position on the adaptation plate (5) and align it with the screw holes.
(8) Connect the coaxial connector (4) to the antenna (2).

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.

(9) Safety the coaxial connector (4) with the 14QDB1Wire-Locking Dia: 0.5 mm (0.020 inch) CRES Nickel Alloy -.
(10) Put the antenna (2) in position.
(11) Align the antenna (2) with the gasket (3) and the screw holes.
(12) Install the screws (1).
(13) TORQUE the screws (1) to between 35 and 30 lbf.in (0.40 and 0.34 m.daN )

in a diagonally opposite sequence.
(14) Make sure that the bonding contact resistance between the antenna (2) and the fuselage structure (6) is not more than 5.0 milliohms (Ref. AMM TASK 20-28-00-912-802).
(15) Apply a bead of Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) or Polysulfide Sealant-Fuel Tank Quick Curing - (Material No.06ABF1) around the antenna (2).
(16) Apply Primer Paint-Polysulfide Corrosion Inhibiting Structure (Material No.04FEC2) , Polysulfide Sealant_General Purpose Brushable - (Material No.06AAA1) or Polysulfide Sealant-General Purpose Fillet - (Material No.06AAB1) on the heads of the screws (1).

Subtask 23-28-13-914-050-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.

B. Aircraft Antenna Sealant-Exemption

If it is not possible to apply sealant and wait for the cure time, refer to the table that follows. It gives the sealant application time-limits for the LEO passive antenna.
These limits agree with:

The antenna installation configuration
The antenna location
The antenna sensitivity to water infiltration
The sealant availability.

Configuration of the antenna installation	If the airline has sealant but does not want to wait until the sealant is cured	If the airline has no sealant available
Conductive gasket between the antenna and the fuselage: Sealing bead around the antenna Sealant on the heads of the screws.	No exemption possible for the conductive gasket (risk of water infiltration between the aircraft and the antenna). It is permitted to fly for a maximum of 10 days without sealing bead around the antenna if the conductive gasket is installed.	It is permitted to fly for a maximum of 10 days without sealant on the heads of the screws.

NOTE: When there is no sealing bead, there is a risk of aerodynamic noise.

Subtask 23-28-13-865-078-A ** ON A/C NOT FOR ALL

C. 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	SATCOM	240RV	K01

Subtask 23-28-13-740-053-A ** ON A/C NOT FOR ALL

D. BITE Test with the Multipurpose Control & Display Unit (MCDU)
(1) Do the BITE test of the SATCOM system (Ref. AMM TASK 23-28-00-740-001).

5. Close-up
Subtask 23-28-13-410-054-A ** 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).

Subtask 23-28-13-862-052-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.03.31 23:12:44 UTC