FPLTOIF for the first time

ThirdParty
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Hey there I’m using fpltoif for the first and I’m not a real pilot so can’t understand this. Can anyone please help. Thank’s.

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That’ll be your speeds for different stages of flight. 250 kts under 10,000, 300 under FL280 and M0.78 above FL280.

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OK Thank you.

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Slight correction to @TaipeiGuru, it’s only for the climb and descent part, for cruise use the normal cruise speed of the aircraft.
You don’t have to follow the profile, especially descent cuz STAR often have a 280 limit.

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That’s literally what the last number represents. Your cruise. .78 is the cruising speed of the aircraft.

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You seem to be using an A320

250kt to 10000’
300kt above 10000’
When 300kt=.78M (usually around 24000-26000)
Then you adjust your speed down to maintain .78M until reaching top of climb and then you’ll be cruising at either .78M or .80

If you’re using an A320-the fuel factor in simbrief is -15 that will give you close to perfect fuel burn on the SB flight plan!

As an aside- .78M at FL280 where the IF autopilot changes over from speed in Knots to speed in Mach is usually between 292-296kt depending on air density/temperature etc. So as you keep climbing from say FL265 up, you’ll need to keep dropping a knot or two off your speed to maintain .78M

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Here is an example of cruise speed being different:
B757 climb profile is 250/290/78 but cruise is M.80

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Yea i know. It makes a whole what? 5 minute difference if that. Now if it’s telling you to cruise at .78 in a A388 well then somethings is wrong. But the difference between.78-.80 is so marginal.

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It can mean 30-50kt ground speed though which could potentially give you an arrival time of 30 min to almost an hour earlier than .78 🤷‍♂️

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Guys, don’t forget this user is not an expert. I would’ve kept it simple and try not to confuse him.
Just my 0.02c

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i think it’s worth mentioning since some aircraft have different climb and descent mach speeds
eg. CRJ9 has .77 for climb and .74 for descent.

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