CAS philosophy? Surely you can't be serious. I am serious and don't . . .
Yes, Gulfstream has reinvented the way we look at the CAS. And they've done a pretty good job of it too. If you understand how CAS messages are displayed and filtered, you will have a much easier time making V1 and troubleshooting decisions.
Everything here is from the references shown below, with a few comments in an alternate color.
CAS Messages are no longer strictly grouped in Red, Amber, Cyan, White order and then, within a color grouping grouped with the most recent on top. Now when a particular CAS message can be said to have caused other CAS messages, that CAS message is called an Umbrella CAS and will have a "(U)" placed at its end. The messages that were caused as a result are called "Consequential Alert" messages and are preceded by a ">" symbol. And there are more changes. But the bottom line is that you will be able to more quickly discern the important messages from those that are just results.
We've had a sort of CAS filtering in the past which could be aided with an "Inhibit" button to further remove distracting messages during critical phases of flight. This system does all that automatically and promises to only display the messages worth knowing during three critical phases of flight. As far as I know, if the airplane appears flyable just before V1, the only reason to abort would be a triple or double chime or evidence of fire.
Photo: CAS Message filtering, AOM, §2B-07-30, figs. 6 and 7.
Click photo for a larger image
Critical CAS messages are always displayed during the takeoff and/or landing phases of flight.
Some messages are not displayed during both the low speed and high speed segments of takeoff until safely airborne. Some examples of these messages include, but are not limited to: DU 3 Overheat, Cabin Phone Call, and Strobe Lights Off.
An example of how low speed filtering works is as follows:
Some messages are not displayed during the high speed segment of takeoff until safely airborne. Some examples of these messages include, but are not limited to: L Oil Temperature Low, BFCU Active (U), and L OUTBD BRK Degrade.
An example of how high speed filtering works is as follows:
If the V1 speed is not available or not calculated by the flight management system (FMS), the high speed takeoff inhibit remains inactive.
Some messages are not displayed during the landing phase of flight. Some examples of these messages include, but are not limited to: Bleed Configuration, TSC 2 Fail, and NAV Lights Off.
An example of how landing filtering works is as follows:
Gulfstream GVII-G500 Airplane Flight Manual, Revision 4, August 29, 2019
Gulfstream GVII-G500 Production Aircraft Systems, Revision 3, July 15, 2019
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