NAVIGATION AND
COMMUNICATION
AIRPLANE
OPERATIONS
MANUAL
2-18-75
Page
14
Code
01
REVISION 39
AOM-145/1114
HGS EICAS MESSAGES
TYPE MESSAGE MEANING
CAUTION HGS FAIL Failure in the HGS system.
ADVISORY AIII NOT AVAIL
The AIII approach mode is not
available.
HGS CAPABILITY TEST
This test verifies the HGS capability to perform the AIII mode.
To execute this test, press the TEST button on the HCP and select the
first option “HGS CAPABILITY” in the HGS TEST MENU displayed on
the Combiner. In case of no AIII capability detected, the faults will be
displayed on the Combiner.
If the system is capable of performing the AIII mode, “AIII” is displayed
on the left side of the Combiner while “NO CAPABILITY FAULTS
DETECTED” is displayed on the right side.
HGS CONTROLS AND INDICATORS
HGS CONTROL PANEL (HCP)
1 - NUMERICAL KEYPAD
− Used to enter runway (length, elevation) and glideslope data.
2 - DISPLAY SCREEN
− Displays, from the top to bottom:
− The active HGS (PRI, IMC, VMC or AIII) mode.
− The selected standby mode.
− The selected runway length or elevation.
− The selected angle for approach.
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