What is the purpose of the rubber packing mounted on the mating surface of the outer wheel half of a split-type wheel?

The purpose of the rubber packing mounted on the mating surface of the outer wheel half of a split-type wheel is to prevent air leakage from the tubeless tire. This rubber packing creates a seal that ensures the integrity of the tire's air pressure, which is crucial for the performance and safety of the aircraft. Maintaining proper tire pressure enhances fuel efficiency, provides the necessary traction and handling characteristics on the runway, and ensures that the aircraft can take off and land safely.

When the wheel halves are assembled, the rubber packing compresses to form a tight seal. This design is especially important for tubeless tires since any air loss can lead to diminished tire performance, unsafe handling, and increased wear.