C. Put the aircraft back to its initial configuration.
(1)
Do a reset of each ELAC:
- on the panel 49VU, open then close the ELAC1 C/B,
- on the panel 121VU, open then close the ELAC2 C/B.
(2)
De-energize the aircraft electrical circuits
(Ref. TASK 24-41-00-862-002).
(3)
Make sure that the work area is clean and clear of tool(s) and other items.
R 1EFF : 106-149, 213-213, 221-299, 301-399, 1 34-22-25Page 518 1401-499, 1Aug 01/05 1 1 1CES 1 ILS - DESCRIPTION AND OPERATION
_______________________________
1. General
_______
R **ON A/C 001-004,
The function of the Instrument Landing System (ILS) is to provide the crew and airborne system users with lateral (LOC) and vertical (G/S) deviation signals, with respect to the approach ILS radio beam transmitted by a ground station. The localizer operates in a frequency band which ranges from 108.10 MHz to
111.95 MHz.
The glide operates in a frequency band which ranges from 329.15 MHz to
335.00 MHz.
R **ON A/C 051-060,
R The function of the instrument landing system is to measure deviations R between aircraft flight path and R - glide slope R - runway alignment axis (localizer). R The localizer operates in a frequency band which ranges from 108 MHz to R 111.95 MHz. R The glide operates in a frequency band which ranges from 328.6 MHz to 335.4 R MHz.
R **ON A/C 001-004, 051-060,
2. Component Location
__________________ R (Ref. Fig. 001)
-------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF.
-------------------------------------------------------------------------------2RT1 RECEIVER-ILS, 1 95VU 121 811 34-36-31 2RT2 RECEIVER-ILS, 2 96VU 122 811 34-36-31 3RT ANTENNA-LOCALIZER 1/2 110 110AL 34-36-11 4RT ANTENNA-GLIDE/SLOPE 1/2 110 110AL 34-36-18
R 1EFF : 001-004, 051-060, 1 34-36-00Page 1 1 1 Config-1 May 01/05 1 1 1CES 1R ILS - Component Location R Figure 001
R 1EFF : 001-004, 051-060, 1 34-36-00Page 2 1 1 Config-1 May 01/05 1 1 1CES 1
3. System Description__________________
R A. Principle The ILS principle is to receive and demodulate the localizer and glide slope signals transmitted by a ground station. This ILS ground station is composed of: - a localizer transmitter located at the departure end of the runway - a glide slope transmitter located at one side of the front-course of the runway. Each signal is radiated to produce two intersecting lobes, one above the other (glide slope), or side by side (localizer). Each lobe is modulated at predominantly 90 or 150 Hz in each case, so that an aircraft flying down the centerline bisecting the two partially-overlapping lobes would receive an AM-modulated signal with equal levels of each tone. These lines of equal modulation define the localizer course, which bisects the runway centerline, and the G/S course, which provides a glide path at an angle of 2.5 deg. to 3 deg. (Ref. Fig. 002) A station identification is also transmitted on the localizer signal, through a Morse-coded, AM-modulated, 1020 Hz tone. Receive operations are initiated by the selection of a localizer frequency by the frequency control device. Each of the 40 selectable localizer frequencies is paired with one of the 40 glide slope frequencies and the selection of the localizer channel automatically selects the paired glide slope one. In approach mode, the correct ILS frequency being selected, the localizer and glide slope signals are received, filtered, amplified and demodulated by the ILS receiver. With regard to the modulation comparison, it then provides the crew and system users with lateral and vertical deviations.
B. System Architecture
R **ON A/C 001-004,
R (Ref. Fig. 003)
R **ON A/C 051-060,
R (Ref. Fig. 003A)
R 1EFF : 001-004, 051-060, 1 34-36-00Page 3 1 1 Config-1 May 01/05 1 1 1CES 1
R ILS Principle Figure 002
R 1EFF : 1 1 1CES 001-004, 051-060, 1 111 Page 434-36-00 Config-1 May 01/05
ILS - Block Diagram
R Figure 003
R 1EFF : 001-004, 1 34-36-00 Page 5
1 1 Config-1 May 01/05
1 1
1CES 1
R ILS - Block Diagram
R Figure 003A
1EFF : 051-060, 1 34-36-00 Page 6
1 1 Config-1 May 01/05
1 1
1CES 1
