Thales 421, Operation And Maintenance, Page: 68 / 256

LLZ 421
Operation Operation and Maintenance
ILS 420
3−2
Ed. 01.07 SOAC
3.2.1 Indicators and Controls on LCP Front
Indicator Color Function if indicator lights Remarks
ALARM red Monitor 1 and 2 are in ALARM state (i.e. relevant sig-
nals are out of tolerance):
Alarm is set if the monitors being in executive mode
detect that the signal is radiated with defects caused
by faults in the aerial transmitter (or antenna); the
faulty transmitter is shut down and if available the
standby transmitter is changed to aerial. If the radiated
signal remains faulty the system is shut down
or
ECU fault
or
Monitor 1 and 2 are in Bypass/Maintenance Mode. executive bypass
WARNING yellow The station is supplied by battery or has a BITE war-
ning
or
Monitor 1 and 2 are in Bypass/Maintenance Mode. standby bypass
NORMAL green All transmitter and monitor equipment is switched on,
initialized and serviceable for the intended category of
operations (no WARNING and no ALARM).
Control Position Function Remarks
Key−Lock
Switch
Push button
REMOTE
LOCAL
MAINTENANCE
S1,S2,S3,S4
S2+S3 simult.
S1+S4 simult.
Station enabled for remote control,
local control commands at LCP disabled
Station enabled for local operation,
control commands from remote disabled
System set to maintenance mode: ’Monitor
Bypass’ is set, ALARM indication is lit.
Function keys meaning defined per SW menu
Lamp test and audible alarm test if simulta-
neously pressed
Call up of LCP control menu, if simultaneously
pressed during LCP reset or system restart
Station is operable.
Local read out of
values possible
Station is not oper-
able.
Remote read out of
values possible
Station is not oper-
able.
Service activity
Ed. 07.08