Page 690 - PPL-engelsk 2025
P. 690
Aircraft general knowledge
Always check for “flat spots” on the tires before you go out to fly. If you don't
notice them, but the next person on the plane does, you will be blamed for the
damage.
Many tires are actually just without a tread.
The grooves in the tire serve partly as wear
indicators. So, when the tread is gone or partially
gone, it's time to change the tire.
The tire here is from a Storch Fieseler and has wear indicators.
8.3.5.2 The oleo leg
The oleo leg is a special construction.
One part of the undercarriage leg functions
as a cylinder in which the other part can
move like a piston.
There is oil above the piston and air above
that. The air is pumped up to pressure, whereby the undercarriage can carry its
share of the aircraft's weight when it is stationary on the ground.
Impact during driving and landing compresses the air and thus also the entire
undercarriage leg, whereby oil is forced up through an opening at a regulated
speed, depending on the magnitude of the
impact.
The undercarriage provides great drag which is
why they are often shielded with fairings. On
more advanced aircraft, retractable
undercarriage is available.
Flyveteori PPL(A)(UL)/LAPL Henning Andersen, Midtjysk Flyveskole© 2025 690
