190-01115-01 G3X/G3X Touch Installation Manual - GDU 37X Config and Post Install Checkout
Rev. AC
Page 33-132
GAP 26 Alert Configuration (-20 version only)
If the discrete output (bare blue wire) from the control box is connected to one of the EIS discrete input
pins on the GEA 24 or GSU 73, the status of the GAP 26 heater can be displayed in one of three ways
(following), depending on user preference:
1. The discrete input configuration shown in Figure 33-38 will result in a green "PITOT HEAT"
indication that will appear on the PFD any time the GAP 26 heater is powered and the probe
temperature is above approximately 25° C (77° F). If pitot heat is powered off or inoperative, the
green "PITOT HEAT" indication will not appear.
Figure 33-38 Configuration #1
2. The discrete input configuration shown in Figure 33-39 will result in a yellow "PITOT TEMP"
alert that will appear on the PFD any time the GAP 26 heater is powered off, or if it is powered on
but the probe temperature is below approximately 25° C (77° F). If pitot heat is powered and the
probe temperature is sufficiently high, the yellow "PITOT TEMP" alert will not appear.
Figure 33-39 Configuration #2
3. The discrete input configuration shown in Figure 33-40 will result in a yellow "PITOT TEMP"
alert that will appear on the PFD similar to Configuration #2, with additional logic that
automatically prevents the yellow "PITOT TEMP" alert from appearing if the outside air
temperature is above approximately 7° C (45° F). This configuration provides the same indication
as Configuration #2, but hides the pitot temperature alert when flying in warmer weather
conditions.
Figure 33-40 Configuration #3
