Tyre flat spots
 

Is there a time limit an aircraft can remain parked in the same position before the tyres develop flat spots or some maintenance schedule for moving them to prevent this happening?

I think flat spots are only developing when you brake too hard on landing?

But what type of aircraft are you talking about? We've had our Piper parked throughout winter without noticing the air was leaking.... filling it up and checking it revealed no damages. I have no idea about heavier stuff, but my guess is that as long as there is air in the tyres, it shouldn't pose a problem.

Dunlop advice:

"Wheels should be rotated at least every 2 weeks by 90 degrees to relieve flat spots that will form on the contact patch.

Tires must be correctly inflated before the aircraft is moved.

The crew might notice vibrations during taxi and take-off when the aircraft is operated for the first time after a period of storage. The vibration is caused by flat-spots and it should diminish during the first taxi and take off. Crews should be informed of this issue."

https://www.dunlopaircrafttyres.co.u...rked-aircraft/

MM for 777 long term parking gives rotate the tires or tow a short distance once a month.

Certainly the RAF advice was to rotate the wheels periodically, I would expect this originated from manufacturer's guidance. The 'flat spot' due to weight on ground will be more pronounced (I hope) than any resulting from a skid, assuming that the tyre still holds air after the skid...

The phenomenon would be more noticeable in very cold weather, when the tyre rubber is harder, and slower to recover true shape upon first use of the day. Tyres will heat up during taxi, but a short taxi and rapid take off could be a bumpy ride.

Many a time I've had to taxi an aircraft with flat spots on the gear from prolonged rest ( 2-3 days even).. I did find that being twin wheeled bogies, a corner turn stopped the very low frequency bounce...The out of round condition was never noticable after the next landing.