(Ref. Fig. 401/TASK 23-11-36-991-001-B) R **ON A/C 051-099, 301-399, 401-499,
(Ref. Fig. 401A/TASK 23-11-36-991-001)
**ON A/C 106-149, 211-299,
(Ref. Fig. 401B/TASK 23-11-36-991-001-C)
1EFF : ALL 1 23-11-36Page 413 1 1 Aug 01/05 1 1 1CES 1
R **ON A/C 201-210,
R (Ref. Fig. 401C/TASK 23-11-36-991-001-A) **ON A/C ALL
Subtask 23-11-36-420-050
A. Installation of the HF Antenna Coupler
(1)
Clean the component interface and/or the adjacent area.
(2)
Do an inspection of the component interface and/or the adjacent area.
(3)
Remove the blanking caps from the electrical connectors (5) and (6).
(4)
Make sure that the electrical connectors are clean and in the correct condition.
(5)
Carefully install the HF antenna coupler (1) into the rack (4).
(6)
Lift the fasteners and tighten the knurled nuts (3), until the antenna coupler (1) is correctly attached.
(7)
Remove the blanking caps from the connectors (2).
(8)
Make sure that the electrical connectors are clean and in the correct condition.
(9)
Connect the electrical connectors (2) to the antenna coupler (1)
(10) If the aircraft is operated, when an antenna coupler is removed, make sure that: FOR 4RE1 the electrical connectors (2) are disconnected from the related dummy plugs, which are installed near to frame C68. FOR 4RE2 the alternative SHIELD ASSY - EMI P/N A9239825400000 is removed and the electrical connectors (2) are disconnected from it.
Subtask 23-11-36-865-052
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1RE1, 1RE2.
1EFF : ALL 1 23-11-36Page 414 1 1 May 01/05 1 1 1CES 1 Subtask 23-11-36-710-050
C. Do the operational test of the HF system (Ref. TASK 23-11-00-710-001).
5. Close-up
________ R **ON A/C 001-049, 051-099, 101-105, 151-199, 201-210, 301-399, 401-499,
Subtask 23-11-36-410-051
A. Close Access
(1)
Make sure that the work area is clean and clear of tool(s) and other items. FOR 4RE1
(2)
Install the ceiling panel 261CC in the Aft cabin utility area (Ref. TASK 25-23-42-400-002). FOR 4RE2
(3)
Install the ceiling panel 262CC in the Aft cabin utility area (Ref. TASK 25-23-42-400-002).
**ON A/C 106-149, 211-299,
Subtask 23-11-36-410-051-A
A. Close Access
(1)
Make sure that the work area is clean and clear of tool(s) and other items.
(2)
Install the ceiling panel 261CC in the Aft cabin utility area (Ref. TASK 25-23-42-400-002).
**ON A/C ALL
Subtask 23-11-36-862-051
B. De-energize the aircraft electrical circuits
(Ref. TASK 24-41-00-862-002)
1EFF : ALL 1 23-11-36Page 415 1 1 Aug 01/05 1 1 1CES 1 VHF SYSTEM - DESCRIPTION AND OPERATION
______________________________________
1. General
_______
**ON A/C 001-049, 051-061, 101-101, 201-203,
The very high-frequency (VHF) system serves for all short-range voice communications between:
-different aircraft in flight
-aircraft (in flight or on the ground) and ground stations. The VHF system operates within the frequency range defined by ARINC 716
(i.e. 118 to 136.975 MHz with 25 KHz spacing between channels).
R **ON A/C 062-099, 102-149, 151-199, 204-299, 301-399, 401-499,
The very high-frequency (VHF) system serves for all short-range voice communications between:
-different aircraft in flight
-aircraft (in flight or on the ground) and ground stations. R The VHF system operates within the frequency range defined by ARINC 716 R (i.e. 118 to 136.975 MHz with 25 KHz spacing between channels).
The VHF system operates within the frequency range defined by ARINC 716
(i.e. 118 to 136.975 MHz with 8.33 KHz spacing between channels).
R **ON A/C 001-049, 051-099, 101-149, 201-299, 301-399, 401-499,
The aircraft is equipped with two identical VHF systems which are fully
independent.
The VHF3 system (if installed) is also used to transmit data link messages
(ACARS or ATSU).
**ON A/C 151-199,
The aircraft is equipped with three identical VHF systems which are fully
independent.
The VHF3 system is also used to transmit data link messages (ATSU).
The Data function (mode A) of the VHF system is defined by ARINC 750-3.
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