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BMI A320 - Nose Gear Fault? Or Poor Loading?  
User currently offlinelegoguy From United Kingdom, joined Jun 2006, 3313 posts, RR: 39
Posted (4 years 7 months 2 weeks 1 day 3 hours ago) and read 3664 times:

I was out spotting today at the local airport and noticed a BMI A320 which was taxing out for departure with quite an obvious rearwards tilt. Linked is a picture of the aircraft in question from today.

I'm just wondering what is causing the aircraft to lean backwards? Poor loading and balancing or is the nose gear somehow damaged?

http://farm5.static.flickr.com/4057/4350171586_bbbbd7d299_o.jpg

Dave


Can you say 'Beer Can' without sounding like a Jamaican saying 'Bacon'?
7 replies: All unread, jump to last
 
User currently offlinetdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 1, posted (4 years 7 months 2 weeks 1 day 1 hour ago) and read 3622 times:

Quoting legoguy (Thread starter):
I'm just wondering what is causing the aircraft to lean backwards? Poor loading and balancing or is the nose gear somehow damaged?

Could just be a very aft CG (not "poor", just odd) or an overserviced nosegear strut.

Tom.


User currently offlinebassbonebobo From United States of America, joined Apr 2008, 66 posts, RR: 0
Reply 2, posted (4 years 7 months 2 weeks 22 hours ago) and read 3576 times:

I can't speak for the A320 but this is a very common sight on smaller aircraft (Piper Cherokee, C172, etc.) In my experience it can be accomplished with a well executed soft field landing followed by minimal braking. My instructor and I would make the last landing of a lesson a soft-field and see if we could get the plane to its tie-down without compressing the nose strut..

In the case of that photo, however, my guess would be a combination of an aft CG and an overserviced nose strut. A light touchdown followed by a long rollout on arrival could play some roll, though.

I'm interested to hear from any A320 pilots or mechanics on this one.



Rule #176. Any device that can crawl across the table on medium, does not need to be brought into the office.
User currently offline474218 From United States of America, joined Oct 2005, 6340 posts, RR: 9
Reply 3, posted (4 years 7 months 2 weeks 9 hours ago) and read 3385 times:

Quoting bassbonebobo (Reply 2):
In the case of that photo, however, my guess would be a combination of an aft CG and an overserviced nose strut. A light touchdown followed by a long rollout on arrival could play some roll, though.

Could be that the brakes had been applied or there was a bump on the runway and the nose strut was rebounding when the picture was snapped.


User currently offlineDocLightning From United States of America, joined Nov 2005, 19738 posts, RR: 59
Reply 4, posted (4 years 7 months 1 week 6 days 22 hours ago) and read 3245 times:

Quoting 474218 (Reply 3):

Could be that the brakes had been applied or there was a bump on the runway and the nose strut was rebounding when the picture was snapped.

He said he saw it taxi out with the tilt, so presumably he means that it was that way for a while. I appreciate the above responses. What is "overserviced?"


User currently offlinetdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 5, posted (4 years 7 months 1 week 6 days 20 hours ago) and read 3208 times:

Quoting DocLightning (Reply 4):
What is "overserviced?"

Too much pressure in the strut. For a given ambient temperature, there's a proper range of pressure that should be in the strut to give the proper extension for a given weight. If you put too much charge in the strut, it will be longer than it's supposed to be at a given weight.

Tom.


User currently offlinelegoguy From United Kingdom, joined Jun 2006, 3313 posts, RR: 39
Reply 6, posted (4 years 7 months 1 week 6 days 12 hours ago) and read 3117 times:

Many thanks for the replies. Indeed the aircraft also taxied out onto the runway with the rearwards tilt so it could not be attributed to a bump in the runway as the photo was taken. I assame then that a rearwards centre of gravity would not have any serious effects on flight apart form a slight nose up attitude.

Thanks again guys,

Dave



Can you say 'Beer Can' without sounding like a Jamaican saying 'Bacon'?
User currently offlinetdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 7, posted (4 years 7 months 1 week 6 days 9 hours ago) and read 3075 times:

Quoting legoguy (Reply 6):
I assame then that a rearwards centre of gravity would not have any serious effects on flight apart form a slight nose up attitude.

As long as you're inside the flight envelope, there's no serious effect. It shouldn't result in a nose-up attitude. An aft CG actually reduces the amount of downforce the tail has to provide, which reduces the amount of lift the wing needs to generate, which reduces AoA, which leads to a more nose-down attitude. But the change is so tiny I suspect it's functionally invisible.

Tom.


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