I am flying Cessna Citation Longitude or an Boeing 747. I am flying at 3000ft, trying to catch the LOC. As soon as the GS is caught it may happen, that the plane drops below GS in AP mode.
My AP is set to approach mode with auto throttle set.
Could it be that I set the speed to low? When flying at full flaps the copilot suggests a landing speed of 100kts (Cessna)- which let’s my plane stall. 125kts seems to do.
Why don’t you try to do it without auto-throttle and see? Works fine for me, but i don’t use auto throttle as I like to control it. What altitude do you kick off AP and hand fly it? Is it already way off the GS then? Also, is 3000ft the suggested altitude at that airport to pickup the localizer? (seems high but depends on airport elevation)
not sure you can say that in general, but at least you can catch it and see the green bubble descend until it hits the middle, then the plane starts to sink.
I usually use the LOC/GS until 300-500 feet above ground and then turn of AP and auto throttle
From what I found on the internet the landing speed of a Citation Longitude should be between 120-130kts. Copilot suggests 100kts what makes the plane stall.
Check your CG. It might be out of limits.
Yeah, 100 sounds pretty low.
Not much experience on the longitude, mostly fly the FBW A320 and TBM. But you say the ILS indicator goes to the middle and you start to descend? That all sounds right. But doesn’t stay on GS then? If so, that does sound like a speed issue.
I’ve been doing some reading on this. There are actually multiple GS’ because of how ILS works. If you’re high or low, the ILS frequencies are reversed. Hit it at whatever altitude the charts say to and it will work. I’ve done it on several airframes. If you’re altitude(speed too. don’t come in hot) is right, ILS and autoland work perfectly.
I’m pretty sure that false GSs aren’t simulated.
NO default aircraft in MSFS can perform an autoland!
You have to disengage the AP latest between 100-200ft AGL.
When you arm the APR you should be pretty much set up for the approach. Be sure that you are at the correct altitude approaching the FAF. Autothrottle set up at 130 knots and approach flaps set. As soon as you capture the localizer drop the gear. When the AP captures the GS and begins descent set landing flaps. I will usually dial back to 120 knots in the descent phase. Allow the AP to take it down to 300 ft and kill the autothrottle. Confirm you have throttle set to match what the A/T had you at and then kill the AP and hand fly to the flare.
The AP in the sim does NOT provide any Autoland on any aircraft, as @PZL104 mentioned.
NOTE: This is a very generic ILS instruction for the Longitude. The altitudes are published in the appropriate plate for the approach you are flying. Two very important numbers here are the altitude at the FAF and the minimum descent altitude or DH (decision height). You can shut down the A/T and AP at any point you like. Just make sure to be in control once past the DH and committed to land. The last 50 feet is not the time to be messing about in the cockpit, looking for buttons.
I call BS. I’ve done it more times than I can count with the 787 and 747. Hell, I just landed in Vegas on 26R in the 747 with it. Clean it up.
¸noticed that it was linked with headwind/tailwind with the longitude.
could you confirm if you have the same problem without winds?
So a plane can’t auto land? What exactly is going on here? Lol. Follow the charts. They will tell you where you need to be to hit the GS. They work just fine. That’s 5.3 miles out of KLAS 26R. The 747 caught the GS exactly where it should have. I didn’t touch a thing besides dialing the speed back slightly and deployed spoilers w/reverse thrust once I touched down to slow the plane to a stop. The only other thing I typically do in the 787 and 747 is disconnect the AT a couple of miles out. Easy as can be!
On both the longtitude and the 747 i usually keep them around 140. The longtitude has bitten me multiple times with the speedband not being accurate, thinking that my AoA is good, but then dropping down anyways and me having to floor the throttle to grab it before it hits the ground… (i dont do autopilot most of the times though)
The Cj4 has a much slower approach speed at around 110kts usually.
Woof ~ Woof & ~Salute!~
Steiny
It’s BS for you because you apparently don’t know what autoland means.
1.Automatic flare = doesn’t happen in MSFS
2.Automatic thrust reduction to idle = doesn’t happen in MSFS
1+2 aren’t simulated, hence no autoland.
The pitch attitude/AoA on the Longitude is way too high at the correct approach speed.
If you fly with the correct level, or even slightly nose down, pitch attitude, the speed will be way too high.
IMO a serious bug which should be fixed.
Yes, agreed… that’s why i’m taking more speed in, the AoA indicator is almost off the scale if i slow it down. First time i used the speedribbon… that was also the last time i trusted it 
I don’t understand.
The amber band on the speed tape and the AoA gauge are providing the identical information.
What approach are you flying? The AP is doing what you’re telling it to do. If you’re flying a non-precision approach there is no glideslope.
If the speed drops below a certain threshold, the AP can not do what you want it to do!
That was the OPs problem.
Use those speeds with the Longitude
Well, before this update the speedribbon showed a flapspeed that was way too low… EDIT… i’ve checked and at takeoff the speedribbin is correct, upon landing it’s WAY off… the yellow (warning part) was sitting below 110 knots… red at 80…
On takeoff, however, the speedribbon’s yellow ended at 135 knots’ish…
here a screenshot of the approach to land (whilst stalling already, note vertical speed)
