Thales 421, Эксплуатация и обслуживание, Страница: 176 / 256

LLZ 421
Repair Operation and Maintenance
ILS 420
6−34
Ed. 01.10 SOAC
6.6.3.3 Replacing LLZ Antenna
A large number of settings or alignments must usually be remade after replacing components of the
LLZ antenna system or nearfield monitor dipole. A special flight test is also necessary. For the LLZ
antennas refer also to the corresponding Technical Manual Part 3, Antenna Description.
6.6.3.4 Replace and reconfigure Subassemblies LCP, LG−A and LG−M
Before starting any replacement it is recommended to read out all parameters of the installation: Save
all parameters in a file (with ADRACS ’Data’ submenu ’Up−/Download Data’, resp. with MCS ’Snap-
shot’ submenu ’Save’), make a printout of all parameters, or write down manually the indicated pa-
rameters if other measures are not possible.
It is also recommended to generate a copy of the specific site files as backup:
a) Using the PC User Program ADRACS, click on the ’Control’ button in the Main Status window, se-
lect ’File Transfer’ and ’Copy SITE file to PC’ in the submenu.
Using the ’MCS File Transfer’ tool, select ’FILE OPERATIONS’ in the MASTER MENU, select func-
tion ’COPY SITE FILE TO PC’.
b) Copy all files with the extensions *.sit , *.oio , *.msk , *.ptt or *.dat..
The LCP subassembly contains routines which allow to configure the LCP to the system ILS 420 or
CVOR/DVOR and which are used to update the firmware of the basic subassembly LG−
X . LG− X
means that the spare processor board is not assigned to be an Audio Generator (−A) or Monitor bo-
ard (−M). This is performed by SW after inserting the LG−
X board to its defined location.
The load and boot routine assigns the neutral board to its destination in either TX1 or TX2 as LG−A
or LG−M. This procedure has also to be done when replacing LG−A or LG−M from TX1 to TX2. The
LCP routine checks the LCP hardware. The LG−
X update routine performs an internal COM port link
between the LCP communication port COM1/PC1 (and a connected PC/laptop) and one of the LG− X
communication ports. For LG− X update, the application "420ILS LGX Flash memory Configuration"
has to be installed and started on the PC. The LG− X software itself is stored on floppy disks (or a
CD−ROM).
During LCP reset and system start, two LCP screen contents are available:
− the LCP Control Menu (Fig. 6−8 a), if buttons S1 and S4 have been pressed and hold,
− the LCP Warning text (Fig. 6−8 b), if the LCP has been replaced and no configuration is set.
CAUTION
Do not use function S2 of LCP Control Menu unfounded. This feature is intended for fac-
tory use only or if the drive must be cleaned up, or to delete faulty
*.sit or *.oio files.
To copy the LCP software to the LCP (see 6.6.3.4.1 ) use commands of the PC user program:
a) Using ADRACS program, click the ’Control’ button in the Main Status window, select ’File Transfer’.
Using the ’MCS File Transfer’ tool, select ’FILE OPERATIONS’ in the MASTER MENU.
b) Select ADRACS command ’Copy PC file to RAM’ resp. MCS command ’COPY PC FILE TO SITE’.
NOTE: If there is no communication to the LCP with the PC User Program, the LCP control menu
offers to start a transfer routine with S3 to establish communication. Once the commu-
nication is available the LCP SW can be copied to LCP. If this fails, check the link to PC
or replace the CPU board which possibly is faulty.