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Touble When Landing In FS9.  
User currently offlineAirNick From United Kingdom, joined Mar 2007, 41 posts, RR: 0
Posted (7 years 3 weeks 2 days 7 hours ago) and read 6874 times:

Okay, this is happening consistently.

When on approach I intercept the localizer and leave 3000 feet (as instructed) by turning off whats left of the autopilot ie. As I was coming into approach, I disengage different parts of the autopilot one by one.

The problem is when turning off the altitude part of the autopilot (which is the final thing I do) the nose suddenly lifts - and doesn't stop lifting. This takes a good amount of force to get it back level, only to find when you let go, the nose lifts again.

Should this be happening?

Nick.

[Edited 2007-08-06 21:55:37]

10 replies: All unread, jump to last
 
User currently offlineANITIX87 From United States of America, joined Mar 2005, 3303 posts, RR: 13
Reply 1, posted (7 years 3 weeks 2 days 7 hours ago) and read 6865 times:
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Check the trim on your horizontal stabiliser. That would be my advice. I don't know exactly where it should be, as I tend to either land nose-wheel first, or to slam my main gear down, bounce, and then land nose-wheel first.

TIS



www.stellaryear.com: Canon EOS 50D, Canon EOS 5DMkII, Sigma 50mm 1.4, Canon 24-70 2.8L II, Canon 100mm 2.8L, Canon 100-4
User currently offlineEbs757 From United States of America, joined Jul 2006, 758 posts, RR: 0
Reply 2, posted (7 years 3 weeks 2 days 7 hours ago) and read 6864 times:

If your coming in too slow your elevator is going to trim your nose up like that.


Viva la Vida
User currently offlineJamesbuk From United Kingdom, joined May 2005, 3968 posts, RR: 4
Reply 3, posted (7 years 3 weeks 2 days 7 hours ago) and read 6853 times:

Basically the Autopilot trimmed the aircraft into a nose up position, all it means is when you take it off autopilot, nose trim it out untill you feel comfortable, i normally trim it to about neutral so its not pushing up or down. The trim gauge is normally on the panel where the throttles are.

Rgds --James--



You cant have your cake and eat it... What the hells the point in having it then!!!
User currently offlineStevesdream69 From Italy, joined Feb 2007, 22 posts, RR: 0
Reply 4, posted (7 years 3 weeks 1 day 18 hours ago) and read 6807 times:

Recently started sim-flying. In an instrumental landing (ILS) should I just switch the ILS button on to get the liner to correctly descent on the runway? How would the autopilot be set at that time?
At the moment once I get the final instructions from ATC i switch all the autopilot off and descend manually.
I am simflying airbus 320 or 738 at the moment and I usually manage to make heavy landing not exactly on the runway just before. I'm getting there LOL, but I don't know how to start using the ILS. Any quick tip?


User currently offlineGAIsweetGAI From Norway, joined Jul 2006, 933 posts, RR: 7
Reply 5, posted (7 years 3 weeks 1 day 16 hours ago) and read 6792 times:

You might want to make sure you disconnect the autothrottle when you disengage the altitude hold. Just a thought.  Smile


"There is an art, or rather a knack to flying. The knack lies in learning how to throw yourself at the ground and miss."
User currently offlineStevesdream69 From Italy, joined Feb 2007, 22 posts, RR: 0
Reply 6, posted (7 years 3 weeks 1 day 16 hours ago) and read 6789 times:

So.... I have autopilot engaged, I switch the ILS button on, disconnect autothrottle and altitude hold. How about heading? Should I leave it on? Or shoud I disengage the heading as well?

User currently offlineANITIX87 From United States of America, joined Mar 2005, 3303 posts, RR: 13
Reply 7, posted (7 years 3 weeks 1 day 12 hours ago) and read 6771 times:
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I don't know if FS is the same, but on x-plane you choose LOC as the source for the heading hold, and NAV on the autopilot source (with the ILS frequency as the active NAV radio frequency). Then, as long as you approach the ILS from a small enough angle, it should intercept the glideslope.

TIS



www.stellaryear.com: Canon EOS 50D, Canon EOS 5DMkII, Sigma 50mm 1.4, Canon 24-70 2.8L II, Canon 100mm 2.8L, Canon 100-4
User currently offlineGAIsweetGAI From Norway, joined Jul 2006, 933 posts, RR: 7
Reply 8, posted (7 years 3 weeks 1 day 7 hours ago) and read 6746 times:

When you have the approach/ILS hold engaged as well as the heading and altitude hold, the heading hold will disconnect when you intercept the localizer and the altitude hold disconnects when you cross the glideslope. After that you should have no problem disconnecting the autopilot and autothrottle. If the nose still wants to pitch up, you do have a slight problem that I wouldn't know how to solve.


"There is an art, or rather a knack to flying. The knack lies in learning how to throw yourself at the ground and miss."
User currently offlineACDC8 From Canada, joined Mar 2005, 7642 posts, RR: 35
Reply 9, posted (7 years 3 weeks 18 hours ago) and read 6708 times:

It's most likely your pitch trim, you need to adjust it as you disconnect your autopilot. I don't play FS nearly as much as I used to, but I am very sure that this is what your problem is as I've had it with certain (not all) FS aircraft. However, another problem I've had quite often is when the autopilot intercepts the g/s, the ALT hold will go off and the plane will go almost vertical for no apparent reason. Thats one problem I've still not been able to figure out, but your's sounds like you just need to adjust the trim.


A Grumpy German Is A Sauerkraut
User currently offlineZarniwoop From United Kingdom, joined Apr 2005, 265 posts, RR: 0
Reply 10, posted (7 years 3 weeks 12 hours ago) and read 6681 times:

Can you give more details of your sequence of turning things of and exactly when?

If you are in level flight with the autopilot & autothrottle on and switch the autopilot off then the plane should theoretically stay in level flight (since the autopilot is just changing the trim instead of you). If anything changes it will be a slow drift not a sudden change in pitch or bank.
The only problem I have noticed with FS9 is that the resolution of the trim is sometimes not good enough to maintain a constant level flight (ie, you have to keep adjusting the trim up and down). The autopilot does this as well. So if the autopilot is constantly adjusting the trim (& autothrottle if it is on) to maintin level flight and speed then when you switch one of them off it could explain a suddent change in pitch. Some autopilots work better than others in FS9.

The best sequence of events that I have found for transitioning from level flight to the ILS in FS9 is to use the autopilot to maintain altitude, heading and speed to get lined up with the runway. When you intercept the glideslope turn off the autopilot and hand fly. Up to you wether you switch off the autothrottle off or not. One less thing to think about but I find manually control of the throttle is better when adding in flaps, etc. I'm not sure why you would want to slowly turn of bits of the autopilot as you intercept the glideslope.


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