Every time I land the Airbus A321 in FSX the nose wheel collapses every time. Why is this happening and how did I fix? This video is similar to what I am experiencing: http://www.youtube.com/watch?v=cqk5g5Nvms4

Maybe a misplaced contact point for the nose wheel? You will need to take a look at the corresponding aircraft.cfg entry for the A321. If you could post the "contact points" section of that file here, I will check mine (provided you're having trouble with the deafult one, I don't have any addon A321 installed at the moment), and if my assupmtion is correct, I'll tell you the right values.

Did you make any changes to the aircraft.cfg lately (or possibly some addon did that for you, e.g. some mission pack installer)? Becaues otherwise it would be hard to explain why that entry would change.

Thanks for your reply. It is actually an addon A321 (Project Airbus I think) which I recently installed and I haven't changed anything on it. Here are the contacts points in the aircraft.cfg file:

//--------------------------------------------------------

[Contact_Points]
max_number_of_points=50.0
static_pitch=-0.319722
static_cg_height=11.60811023622
gear_system_type=0.0
emergency_extension_type=2.0

point.0 = 1, 50.8, 0.0, -11.96, 800, 0.0, 1.533, 68.0, 1.0, 1.44, 0.68, 13.2, 12.9, 0.0, 252.0, 282.0
point.1 = 1, -4.2, -12.45, -12.27, 1200, 1.0, 1.68, 0.0, 0.72, 1.54, 0.8, 14.0, 13.7, 2.0, 252.0, 282.0
point.2 = 1, -4.2, 12.45, -12.27, 1200, 2.0, 1.68, 0.0, 0.72, 1.54, 0.8, 14.2, 13.3, 2.0, 252.0, 282.0
point.3 = 2, -13.75, -54.58,  -0.50, 750,  0.0, 0.000,  0.0, 0.0,  0.00, 0.00,  0.0,  0.0, 5.0,   0.0,   0.0

point.4 = 2, -13.75, 54.58, -0.50, 750, 0.0, 0.0, 0.0, 0.0,  0.00, 0.0,  0.0,  0.0, 6.0, 0.0, 0.0
point.5 = 2, -65.25, 0.0, 0.05, 750, 0.0, 0.0, 0.0, 0.0, 0.00, 0.0, 0.0,  0.0, 9.0, 0.0, 0.0
point.6 = 2,  66.16, 0.0, -3.16, 750, 0.0, 0.0, 0.0, 0.0, 0.00, 0.0, 0.0,  0.0, 4.0, 0.0, 0.0

//--------------------------------------------------------

Sorry, I can't help you with that one, btu having a quick looks at the contact points they seem OK to me (assuming that the entries 0, 1 and2 are the landing gear entries).But since I have no idea what the others do (except point5 - that one is most likely relevant for tail strikes), you could try if commenting the entries 3-6 out (putting // infront of the entry) and see if that helps. If it does, you can bring them back step by step to see which entry is the culprit.

Hi, the first point is your nose wheel. The next two are your main gear.

 

point.0 = 1, 50.8, 0.0, -11.96, 800, 0.0, 1.533, 68.0, 1.0, 1.44, 0.68, 13.2, 12.9, 0.0, 252.0, 282.0

                                           ^^^^                           ^^^

 

EDIT: Please make a backup of your aircraft.cfg before fiddling with the following sections:

You might try changing the impact damage threshold from 800 FPM to 1200 to match your main gear, or even 1600 which is my AXE setting (nose and main are all 1600 FPM).

Also your Static Compression is way bigger than it should be. Maybe 0.3 or 0.4 there would help.

 

FYI Here is how each comma-separated section is decoded (from the SDK).

0  Class
1  Longitudinal Position        (feet)
2  Lateral Position             (feet)
3  Vertical Position            (feet)
4  Impact Damage Threshold      (Feet Per Minute)
5  Brake Map                    (0=None, 1=Left, 2=Right)
6  Wheel Radius                 (feet)
7  Steer Angle                         (degrees)                                                                                  
8  Static Compression           (feet)  (0 if rigid)
9  Max/Static Compression Ratio
10 Damping Ratio                (0=Undamped, 1=Critically Damped)
11 Extension Time               (seconds)
12 Retraction Time              (seconds)
13 Sound Type
14 Airspeed limit for retraction (KIAS)
15 Airspeed that gear gets damage at (KIAS)