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6.3.6 RADALT Maintenance Page
The RADALT page (see Figure 6-7) selects the configuration of radar altimeter
inputs. If no radar altimeters are installed set configuration of RA1 and RA2 to
NONE.
Radar altimeters are selected by equipment type, i.e. ALT55 for Collins ALT55
altimeter, etc.
Once the equipment is selected, the radar altitude can be read from the data
VALUE line to check for correct operation.
For analog inputs, a corresponding VALID input is present. Ensure that this item
is VALID during normal operation and INVALID during TEST of the RA or
when the RA is powered off.
Note: For Analog radar altimeters, mis-setting the Radar altimeter selection may
show a correct value below 500' and an incorrect value above 500'. Therefore, if
any troubleshooting is required regarding Radar Altimeter operation it is
suggested that a test flight be performed in VFR conditions and the Radar
Altitude be monitored on the ST3400 maintenance page simultaneously with the
Radar Altimeter indicator to check for correct operation.
The Decision Height (D HGT) discrete input may be VALID-LOW or VALID-
HIGH. This will produce a 'MINIMUMS' audio callout.
82002-IM-L
Figure 6-7: RADALT
ST3400 INSTALLATION MANUAL
6-11
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