302-120-402 - Goodyear Flight Mate Butyl Tube 302-120-402 7.50/8.50-10 TR 25 S

302-120-402 – Goodyear Flight Mate Butyl Aircraft Tube (7.50/8.50-10)

Available now through the AirParts Aero marketplace.

Overview Section

The Goodyear Flight Mate 302-120-402 is a premium butyl rubber aircraft inner tube designed for high-performance piston and turboprop aircraft.1 Engineered specifically for use with 7.50-10 and 8.50-10 tire sizes, this tube is the industry standard for maintaining consistent tire pressure and resisting air seepage over long periods.2

Constructed from advanced butyl compounds, the Flight Mate series is favored by flight departments for its superior air retention compared to natural rubber alternatives.3 The TR-25 valve stem configuration is a side-mount, straight valve specifically angled for easy access on 10-inch wheel assemblies, ensuring that pre-flight pressure checks are efficient and accurate.4

Key Features Section

• Continuous Ribbon Butyl Construction: Manufactured using a seamless process that eliminates thin spots and potential leak paths, providing uniform wall thickness throughout the tube.

• Superior Air Retention: Butyl rubber is significantly less porous than natural rubber, maintaining stable inflation pressures for longer intervals and reducing "flat-spotting" during aircraft storage.5

  
  

  
  

• High-Heat Resilience: Formulated to withstand the thermal spikes generated during heavy braking and high-speed taxiing without losing structural elasticity.

• TR-25 Valve Stem: Equipped with a precision-forged TR-25 valve, designed for high-pressure applications and compatible with standard aviation inflation tools.6

  
  

  
  

• Ozone and Aging Resistance: The synthetic compound is highly resistant to environmental degradation and ozone cracking, extending the service life of the tube in extreme climates.

• Uniform Fitment: Sized specifically to fill the tire cavity completely, preventing "folds" or "creases" that can lead to internal chaffing and sudden deflation.

Technical Specifications Section

Aircraft Compatibility Section

The 302-120-402 is a primary component for aircraft requiring a 10-inch wheel assembly:

• Beechcraft King Air 90 / 100 / 200 / 300: Commonly utilized in main gear assemblies for older or heavy-duty configurations.

• Cessna 208 Caravan: Ideal for the rugged, high-frequency operations of cargo and bush pilots.7

  
  

  
  

• Piper PA-31 Navajo / Chieftain: Provides the reliability needed for commuter and air-taxi service.

• Twin Commander 500/600 Series: Reliable performance for multi-engine corporate transport.8

  
  

  
  

• Agricultural Aircraft (Air Tractor / Thrush): Essential for handling the heavy loads and soft-field conditions typical of aerial application.

Technical Applications & Safety

Inner tubes are critical for the structural integrity of the tire assembly. A fold or wrinkle introduced during installation can cause a "chaffing" failure that mimics a blowout.

Safety Warning: Never reuse a tube after a tire has worn out. Over time, the tube "grows" to fit the shape of the tire carcass. If installed in a new tire, the older, stretched tube can overlap or fold, leading to internal heat buildup and failure. Always use Tire Talc during installation to allow the tube to shift and seat correctly against the tire carcass without sticking or pinching.

Technical Engineering Insight

The engineering value of the 302-120-402 lies in its Molecular Permeability Coefficient. Natural rubber tubes allow air to pass through the molecular structure at a rate that can cause a 5% pressure loss in just a few weeks. Goodyear’s Flight Mate butyl compound reduces this permeability by nearly 10x. This is especially vital for heavy turboprops like the King Air; maintaining precise pressure ensures that the tire footprint remains optimal, preventing uneven tread wear and reducing the "rolling resistance" that can negatively impact fuel burn and takeoff distances.

Installation & Maintenance Addendum

1. Talc Application: Liberally apply tire talc to both the tube and the inside of the tire. This acts as a dry lubricant to ensure the tube "crawls" into place as it is inflated.

2. Dual Inflation Method: Inflate the tube partially to seat it, then completely deflate it before final inflation. This process allows any trapped air between the tube and tire to escape and any folds to straighten out.

3. Valve Core Inspection: Always install a new high-pressure valve core (e.g., MS20813-1) when installing a new tube to prevent slow leaks at the stem.