Simviation Forums

Hi all,

I dont fly boeing much because of a small problem....on touchdown the plane usually bumps up again or tilts downwards too much because I dont know how to adjust my (what I believe is called elivator trim?). In the airbus panel you can see how much the elevator trim is and adjust it using the up and down keys! the b777 and b737 panels dont have this! any idea how to perform a decent landing with a boeing without the airplane bumping upwards?...taking into account i perform for ILS landing at between 140-180 KIAS depending on the aircraft and weather conditions....many many thanks

how much weight on the aircraft?? are flaps deployed? when you say tilts up are you mains in the ground..it is normal for a boeing jets to tend to nose up when you land..and there is a maneuver to counter that..its called the boeing push by boeing piolts..that phrase is not in the manuels just something boeing piolts came up with...on touch down the relax off back pressure just a bit..this dont mean push the nose down because you will drill the nose into the ground..it somewhat a balencing act...tilting foward sounds like your a bit slow on touch down weight ans ballance could be out of wack or not trimmed right..or in both of these scenarios it could be that the plane is not trimmed for landing cofiguration ..check out some in the cockpit landings on you tube watch the yolk inputs..you will see what im talking about.....i cant speek for airbus, dont know much about them..

Hi all,

I dont fly boeing much because of a small problem....on touchdown the plane usually bumps up again or tilts downwards too much because I dont know how to adjust my (what I believe is called elivator trim?). In the airbus panel you can see how much the elevator trim is and adjust it using the up and down keys! the b777 and b737 panels dont have this! any idea how to perform a decent landing with a boeing without the airplane bumping upwards?...taking into account i perform for ILS landing at between 140-180 KIAS depending on the aircraft and weather conditions....many many thanks

no, what i meant is, when i touchdown, my aircraft bumps up in the air and touch down again later on the runway......its because i need to adjust my up and down key even when the autopilot is on! how?

autopilot should be off on landing unless you have an autoland..which is a guage you can download..if autopilot is off then sounds like your bouncing due to exsessive speed..what is your aircraft weight and what plane are you useing..

no, what i meant is, when i touchdown, my aircraft bumps up in the air and touch down again later on the runway......its because i need to adjust my up and down key even when the autopilot is on! how?

That's how Boeing got it's name, isn't it? :-?






Really though, it just sounds like you might be coming in a little hot.

LOVE IT

That's how Boeing got it's name, isn't it? :-?






Really though, it just sounds like you might be coming in a little hot.

I agree that your airspeed as you touch down is probably too high... or maybe you are descending too rapidly.
In either case, final approach is no time to be fiddling with the trim.

autopilot should be off on landing unless you have an autoland..which is a guage you can download..if autopilot is off then sounds like your bouncing due to exsessive speed..what is your aircraft weight and what plane are you useing..

no, what i meant is, when i touchdown, my aircraft bumps up in the air and touch down again later on the runway......its because i need to adjust my up and down key even when the autopilot is on! how?

lol yea really really good pilots can land with autopilot(without autoland), u can see it on youtube.

really really good sim pilots will land without help from auto land or autopilot...they will fly the plane in themself ...if the RVR is low then you shoot a cat 1 or cat 2 approach cat 3 with auto land ..if the autopilot is doing everything on the approach and landing then wheres the challenge..use whats available to you when its needed ...just like full scale pilots...after all isent that the point.. regards

autopilot should be off on landing unless you have an autoland..which is a guage you can download..if autopilot is off then sounds like your bouncing due to exsessive speed..what is your aircraft weight and what plane are you useing..

no, what i meant is, when i touchdown, my aircraft bumps up in the air and touch down again later on the runway......its because i need to adjust my up and down key even when the autopilot is on! how?

lol yea really really good pilots can land with autopilot(without autoland), u can see it on youtube.

Well I would have to say that your landing speed is too high and that your realism settings are set to low. That is why your plane bonnces like a ball cause when you hit the ground at high speeds, you should have crashed but since your realism settings is set to low, it resets and the plane with such high speeds and with flaps down flys up again and since your engines have probably flared then it drops and the situation repeats itself etc.

I think you should land your Boeing at speeds around 140-180 knots depending on the type of Boeing U are flying, the weight, weather conditions etc. Go to the flying lessons in fs9 and see the landing speed.

Don't forget to arm your spoliers too when U land. It helps

amaru, first of all are you using a joystick or the keyboard? If keyboard, hats off to you, I've never got the hang of it. If you haven't got a stick, even a cheap two-axis one will transform the game for you.

Secondly, about trim, all the Boeings have trim indicators. In the 737 and 777 they are small wheels on the panel, with gauges giving you the trim position in terms of degrees up or down; the 747 is different, the indicator is on the throttle pedestal, which you have to call up.

But, in any case, the indicators are only useful for setting the trim before takeoff; in flight, they don't help because you have no way of knowing what setting is appropriate to a given situation. The correct method is to watch the nose of the aeroplane, and/or the 'rate of climb and descent' gauge, and trim the aircraft to fly straight and level at a given airspeed. In level flight, depending on the fuel load etc., most aeroplanes fly 'level' at between 2 and 3 degrees upward trim.

In any case, if the autopilot is 'on,' it will be handling the trim itself. It will immediately 'unwind' any trim setting you put in.

As for the approach, 140 knots is fine for almost any airliner. 180 is way too fast. In any case, one shouldn't confuse 'approach speed' (say 140) with 'landing speed,' touchdown speed, which is much lower. Nor should you try to land with the autothrottle on. Normal practice is to turn the autopilot and speed hold off at about 1,000 feet (or 500 at the latest), cut all power as you cross the threshold, and then 'flare' - ease the stick back to raise the nose, and then hold that position while the speed drops off and the aeroplane 'settles' by itself. Again, glance at the 'rate of descent' gauge and try to get it down to about 200 feet a minute.

Touchdown in an airliner usually occurs at about 110 knots. And the very best landings are the ones where even YOU don't know exactly when you're going to hear the wheels start rumbling!

Step-by-step guide and more tips here:-

http://www.simviation.com/cgi-bin/yabb2/YaBB.pl?board=COF;action=display;num=1111322151

Hope some at least of all that helps.

Hi amaru.

If you're still bouncing on touchdown even following the great advice above, there is something to check in the aircraft.cfg file that may help, if you're confident about editing it. (Make a backup first.)

In the [contact_points] section, look at the three points for the landing gear (0, 1 and 2). This example from my 737 Experience FD shows the left main gear.

point.1=1.0, -3.16, -9.4, -7.80, 1574.80, 1.0, 1.64, 0.0, 1.0, 2.50, 0.95, 7.90, 7.90, 2.0, 250.0, 300.0

Highlighted is the damping ratio figure for the gear (1.0 is max damping) - too low a setting makes the gear too bouncy and will result in the effect you describe. The figure shown works well with the 737, and you shouldn't bounce with a good landing. Adjust until you're happy with it, although you might find with practice at landing that you don't need to make any adjustment at all.