Skip to main content

Hub slippage

The Tire and hub system in aircraft just like any other wheel, work in combination with each other to provide a smooth translation motion of the aircraft. However the forces acting on the aircraft and a car or a bike is where the difference starts. Aircraft wheel has to bear a lot of load during its rotation as compared to a car.
This is why the hub slippage is most common in aircraft and not a car or a bike. This is a phenomenon where the hub and tire slip under the immense pressure exerted by the aircraft load.
This phenomenon does not occur on all tires. Some of the tires that allow such phenomenon are:
1. All Helicopter tube tires
2. Tires having inner tube.
3. The tire pressure being less than 150 Psi.

The hub slippage is detected by painting a red paint on the hub and tire. The pain being a strip of width of 1 inch and length of 2 inch. After every take off and landing the wheel is inspected for slippage. If the alignment of the paint on the hub and the tire exceed more than 1/4 inch then the wheel assembly should be replaced.


Failure to correct tire slippage may cause the valve steam to be ripped from the tube. So this is a critical check that needs to be performed on a plane.

All about aircraft tires...

Labels

Labels:

Comments

Post a Comment

Popular posts from this blog

ATA numbering system

 An aircarft has a lot of parts, manufacturing them is one thing maintaining them is some other level challange. Thus to describe what needs to be done for what part requires a lot of documentation.  The easy way engineers have come up is to name each section of the aircraft as different title numbers.  ATA- Air Traffic association. It was created by people in ATA so called ATA chapters.  with 100 chapters ATA  So when some one says ATA chapter 72 it will always mean engine. ATA 27 flight controls ATA 32 landing gear ATA 72 is engine  and so on If we go even deeper. ATA 72-00-01 is fan module ATA 72-00-02 is core module ATA 72-00-03 is HPT Module ATA 72-00-04 is LPT module ATA 72-00-05 is AGB module and so on
Post a Comment
Read more

Thrust Reversal

Thrust Reversal consist of 2 words. Thrust and reversal. This is a process adopted to reduce the aircraft velocity during landing. It is a type of braking system. The braking system in an aircraft consist of: 1. Landing Gear brakes. 2. Ground Spoilers 3. Thrust reversal. So while talking about the thrust reversal, the type of aircraft has an important role to play. For the propeller driven aircraft  the reverse thrust is achieved with the appropriate change in the blade angle. However for a jet engine the reversal of the thrust come in basically 2 major types: 1. Reversal by the use of hot exhaust. 2. Reversal by the use of cold bypass air. Classification in terms of mechanism used are: 1. Target (bucket) type  Operated With hydraulics in turbojet engine 2. Clamshell (Cascade) type  Operated with Pneumatics in Low bypass turbofan engine 3. Coldstream type The cold stream reverser system is activated by an air motor in High bypass turbofan engine ...
Post a Comment
Read more

PT6A-27

General Engine specification Blog1. It is a turboprop engine- free turbine . This is an engine used in airplanes like DHC-6 Twin Otter 300  Harbin Y-12 Beechcraft This a Pratt and Whitney Canada Engine. One of the most famous and successful company to produce turboprop engine. Compressor  It consist of 3 stage axial compressor and 1 stage centrifugal flow compressor. Combustion  Annular reverse flow (right to left according to diagram above) combustion with 14 simplex burner (Glow plugs) Turbine 1 stage free power turbine and 1 sage gas generator power turbine.(Left to right according to diagram above) Other specs: Fuel type: aviation kerosine Overall pressure ratio- 6.3:1 Air mass flow: 5.3 lb/s Power to weight ration: 2.14 hp/lb 
Post a Comment
Read more