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Cessna 550 / 551 Citation II

Postby Drdawidventer » Mon Feb 18, 2019 6:19 pm

Good day

I'm trying out the above mentioned aircraft and experiencing problems with the AP Approach.

The glideslope is initially followed, but a few miles out - the aircraft abruptly pulls up, losing control and crashing.

Same thing happens with both the 550 and the Citation II.

Have no problems with the other aircrafts' AP and Approach.

Any advice?

Regards
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Re: Cessna 550 / 551 Citation II

Postby wkitty42 » Mon Feb 18, 2019 6:25 pm

turn off the AP and fly it in by hand? ;)
"You get more air close to the ground," said Angalo. "I read that in a book. You get lots of air low down, and not much when you go up."
"Why not?" said Gurder.
"Dunno. It's frightened of heights, I guess."
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Re: Cessna 550 / 551 Citation II

Postby Drdawidventer » Mon Feb 18, 2019 6:32 pm

Yeah, could try that..... New to flight and flight simulation, didn't known about all the AP stuff - really interesting, and wanted to try it out on the Citation 550 / 551 after a few successful landings with the 172 and 180s. Suck at manual approach. Thanks for the reply though.
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Re: Cessna 550 / 551 Citation II

Postby WoodSTokk » Tue Feb 19, 2019 7:09 am

The AP disconnects at 500 AGL.
This means, you must hold an eye on the radar altimeter while AP is on and in approach mode.
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Re: Cessna 550 / 551 Citation II

Postby Drdawidventer » Tue Feb 19, 2019 5:33 pm

Nope, occurs at an altitude of 3000-4000. Trying to make a video of it to share on the forum, but the AP goes completely haywire now. Cant even get it to initiate the approach at the moment.... :(
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Re: Cessna 550 / 551 Citation II

Postby Drdawidventer » Tue Feb 19, 2019 5:47 pm

Seems like the best small / light aircraft remain the 172 and 180s. Others all have issues.
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Re: Cessna 550 / 551 Citation II  

Postby stuart » Wed Feb 20, 2019 10:44 am

Hi,

A couple of thoughts:

1) Is it possible that the aircraft is stalling because you've not got sufficient power? On some AP modes, the aircraft will following the glideslope by adjusting the pitch. If power is set too low, it will be descending at below the glideslope rate. In this case the AP will command more and more pitch up until it stalls. I've encountered this myself when tuning the autopilot for the FG1000 C182T.

2) Are you approaching the glideslope from above or below? Normally you approach it from below from level flight. If you are approaching it from above, it's likely that the AP will overshoot, descend below the glideslope and then have to make a huge correction.

I would suggest ensuring you are completely familiar with the 172/182 and how the autopilot and ILS system works before moving onto more complex aircraft. That way you'll ahve a much better understanding of what the AP is doing. Just like in real life :).

-Stuart
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