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rfresh737
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Gulfstream IV FLCH IAS Modes

Tue Jun 28, 2022 7:16 pm

The GIV avionics manual is a little confusing to me. It says if I press FLCH that IAS will appear in the PFD's FMA (vertical mode) column. When I press FLCH I see FLCH in the FMA, yet the manual talks about IAS as a pitch mode. So, how do you get the IAS mode to display?
 
GalaxyFlyer
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Re: Gulfstream IV FLCH IAS Modes

Thu Jun 30, 2022 1:26 pm

Where’s the altitude set at? The current level, higher or lower?
 
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rfresh737
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Re: Gulfstream IV FLCH IAS Modes

Thu Jun 30, 2022 1:36 pm

Taking off and right after lift off at 400 feet, you press FLCH. I see that the A/T PFD FMA center column (throttles column) shows FLCH and the right side of the FMA (vertical mode) shows IAS. The manual shows an 'IAS 'in the throttles column of the FMA but I don't see how you get that to display?
 
GalaxyFlyer
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Re: Gulfstream IV FLCH IAS Modes

Thu Jun 30, 2022 3:07 pm

Not Gulfstream guy, I flew Globals, so I’m guessing and didn’t see anyone trying to answer. The autothrottle mode should be THRUST and vertical FLC, but again, not a GLF/Honeywell pilot. Try having the altitude selector at some higher altitude.
 
Jungleneer
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Re: Gulfstream IV FLCH IAS Modes

Thu Jun 30, 2022 4:04 pm

If it is similar to Primus 1000 avionics, if you press FLCH for climb it will be IAS. A pitch mode holding the speed. If you press FLCH for descent, it is indicated FLCH, but controlling fixed vertical speed.
 
GalaxyFlyer
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Re: Gulfstream IV FLCH IAS Modes

Thu Jun 30, 2022 4:20 pm

Are you sure about the locations of throttle, lateral and vertical mode annunciations? I just looked at a Honeywell on YT and it shows A/T left, Lateral left center, Vertical modes, right center. Is IAS in white or magenta?
 
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rfresh737
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Re: Gulfstream IV FLCH IAS Modes

Fri Jul 01, 2022 3:13 am

GalaxyFlyer wrote:
Are you sure about the locations of throttle, lateral and vertical mode annunciations? I just looked at a Honeywell on YT and it shows A/T left, Lateral left center, Vertical modes, right center. Is IAS in white or magenta?


Yes, I am sure about the FMA columns for the GIV. The A/T's are in the center of the five columns. We use the word SLAVE to help us remember:

S L A V E
speed lateral nav ATs vertical nav elevation (altitude)

I'm guessing that the FMS must be the one to paint 'IAS' in the A/T column. I see no other mechanism to do that. When the pilot presses FLCH that puts IAS in the vertical nav column. I need to spend more time watching the FMA work during a flight.
 
GalaxyFlyer
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Re: Gulfstream IV FLCH IAS Modes

Fri Jul 01, 2022 12:06 pm

S in speed is Autothrottles, A in ATs is which channel, 1 or 2 is active. Are you a simmer?
 
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rfresh737
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Re: Gulfstream IV FLCH IAS Modes

Fri Jul 01, 2022 4:35 pm

No...not a simmer...instructor...GIV...don't get much time in the actual aircraft.
 
GalaxyFlyer
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Re: Gulfstream IV FLCH IAS Modes

Fri Jul 01, 2022 8:56 pm

Here’s a link to Honeywell video on PFD.

https://youtu.be/c_I9uPIW1c0
 
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rfresh737
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Re: Gulfstream IV FLCH IAS Modes

Sat Jul 02, 2022 3:07 am

Thank you...

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