Over Head Panel Touch Screens (OHPTS)
The three touch screens on the overhead panel take the place of all those switches and dials you grew up with, only better. Once you start to remember what page to look at to find what you need, they become fairly intuitive.
How it is usually done . . .
Consider the humble fuel panel in a Gulfstream G550. It has a few jobs that involve a bunch of switches: turn pumps on or off, turn valves open or closed, turn the Heated Fuel Return System on or off. We've been doing it basically this way since the GII.
So what's wrong with what has worked since the 1960s? Plenty. That fuel panel is taking up valuable cockpit real estate. The switches don't have a backup, if one breaks, you may or may not be able to continue. And those switches will eventually break because of the many times they have to be pressed. Okay, you probably thought of those reasons. Well here is another: it takes a human being to press those buttons. Even if the only option is to press a switch, the airplane cannot do it for you.
How it is done in the GVII . . .
Photo: G500 fuel page displayed on an OHPTS, PAS, p. 3-14
Click photo for a larger image
The fuel panel is just one page of eight on one, two, or three OHPTS screens. It has the same switches as the G550 fuel panel but contains more information. There are no physical parts to wear out and if the screen goes bad, you have two others. Those fuel pumps can be turned on or off by the APU or the engines. If you have an amber CAS message pointing to this page, the "FUEL" button on bottom with be shown in amber to help guide you to this page.
Green (such as the IRS/APU/Batt button shown) indicates an normal condition.
White (such as the ECS button shown) indicates the button is not selected, informational text, or label.
Gray (not depicted) means a selection that is not available.
Cyan (such as the IRS 1 On Batt button shown) indicates an operating condition that triggers a cyan CAS message.
Blooming (such as the cyan Fire Test shown) indicates the user has contacted a touch area.
Amber (such as the L Alt Pump button shown) indicates an operating state that triggers an amber CAS message, a condition without a CAS message meaning pilot action required, or something that is not armed but selected on. A halo around a menu button means a failure that would trigger an amber CAS message associated with that page.
Red (such as the ECS button shown) indicates an operating state that triggers a Red CAS message associated with that page.
OHPTS IRS APU BATT Page
The APU page will have a Fire Test Switch if the APU Master is off. It will also have messages for various conditions: "APU Ready" (ready to start), "APU Door" (APU door failed to open), "APU Fault" (start checks have failed), "Cowl Door Open" (right engine cowl door is open.
The batteries island will show you the status of the main ship's batteries, the EBHA, and the UPS. If the RAT is active, it will show you its status.
For more about this page, see: G500 Electrical System.
OHPTS ECS Page
For more about this page, see: G500 Air Conditioning System.
OHPTS Exterior Lights Page
OHPTS Fuel Page
For more about this page, see: G500 Fuel System.
OHPTS Hydraulics / CPCS Page
OHPTS Cockpit Lights Page
OHPTS Anti-Ice Page
For more about this page, see: G500 Ice and Rain Protection System.
OHPTS DU Control / Test Page
The FDR/CMC button places an event stamp on the FDR recording using the CMC time series recording.
The CVR Test button causes the CVR to test.
The Master Test button performs a test of the indicated items (annunciators, smoke detectors, passenger oxygen, and equipment overheat). Selecting "System Test" gives you an opportunity to test these individually, as well as test for the RAT, Fire, and both engine ignition lanes on both engines.
Gulfstream GVII-G500 Airplane Flight Manual, Revision 1, August 31, 2018
Gulfstream GVII-G500 Production Aircraft Systems, Revision 1, Oct 1, 2018