Cruise speed hold

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maartenvd84
Posts: 11
Joined: Fri Jan 19, 2018 5:19 am

Cruise speed hold

Post by maartenvd84 » Wed Dec 26, 2018 4:47 am

Hi,

When I'm performing a climb (while still being under 10.000ft), the C750 nicely sticks to the 250kt speed limit as instructed by the FMC.
But once I'm in cruise mode, the 'purple indicated .78 LRC' does not seem to be applied although my throttles are in CRU mode...
Any ideas what I might be doing wrong? --> AP activated, VNAV and NAV activated.
CRU mode.jpg
Thanks! Happy holidays!
Maarten
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WarpD
Posts: 277
Joined: Mon Sep 11, 2017 6:26 pm

Re: Cruise speed hold

Post by WarpD » Sat Dec 29, 2018 12:30 am

What you're "doing wrong" is believing there's an autothrottle on the aircraft. There isn't.

FLC and VFLC are speed holds only in that they adjust aircraft pitch to maintain a set speed. The throttle detents command the aircraft's FADEC to maintain a given thrust level. Not a speed.
Best Regards,
Ed Wilson [WarpD]

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maartenvd84
Posts: 11
Joined: Fri Jan 19, 2018 5:19 am

Re: Cruise speed hold

Post by maartenvd84 » Wed Jan 02, 2019 6:33 am

Hi Ed,

Thanks for the clarifications!
Got it now!

Kind regards,
Maarten

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