LLZ 421
Operation and Maintenance Preliminary Remarks
ILS 420
AEd. 01.10
SOAC
PRELIMINARY REMARKS
The equipment manuals for ILS Localizer 421 (1F and 2F versions) comprise:
PART
CONTENTS CODE NO.
1 Equipment Description 83140 55525
2 Operation and Maintenance
3 Antenna System Description Dipole/Reflector
Antenna System Description LPD 2F
Antenna System Description LPD 1F
83140 55523
83140 55524
83140 55526
This Technical Manual Part 2 describes Operation and Maintenance with the chapters below:
1 General Information
2 Installation
3 Operation
4 Alignment Procedure LLZ−1F (Dipole/Reflector antenna, 14E)
5 Alignment Procedure LLZ−2F (Dipole/Reflector antenna, 13/21E)
6 Maintenance, Fault Location and Repair
7 Alignment Procedure LLZ−1F (LPD antenna)
8 Alignment Procedure LLZ−2F (LPD antenna)
The LLZ−1F specific alignment procedure is contained in Chapter 4 and 7, and the LLZ−2F specific
alignment procedure in Chapter 5 and 8. Installation guidelines concerning both LLZ−1F and
LLZ−2F are contained in Chapter 2. All informations concerning the antenna systems are contained
in Part 3 of the LLZ equipment manuals.
Since it is not possible to include modifications, such as those which may be made to circuitry details
or dimensioning in the interests of technical progress, in the Technical Manual, we should point out
that questions of detail should always be answered using the technical documentation supplied with
the system. It is possible that drawing numbers used in this description are no longer contained in
the set of drawings supplied (LLZ−1F (2F), Volume A to B (C)), but rather than (to conform with the
system) they have been replaced by new drawings with another number. Please carry out a once−on-
ly check on the basis of delivery list supplied and exchange where appropriate.
Description and use of the ’PC User Program’ will be found for ADRACS in the Technical Manual,
Code No. 83140 55324, for MCS in the Technical Manual, Code No. 83140 55325.
MARK SYMBOLS
To get the best out of the navigation systems you should study the contents of this manual care-
fully. In particular you should familiarize yourself with the marks given in this manual which are
highlighted for easy recognition:
Cautions call attention to methods
and procedures which must be
followed to avoid damage to
equipment.
Warnings call attention to methods,
procedures or limits which must be
followed precisely to avoid injury to
persons.
NOTE or REMARK : For more information about operations.
WARNING
CAUTION
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