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Tires and Maintenance

Tires and Maintenance. Tire Bursts and Damage. Tires burst from outboard right to left Loud noises and physical motions. First to burst at 137+ knots. Last to burst. Damage and Brake Loss. Tire fragments struck airplane Brakes lost early in sequence. 219 psi. Tire Construction and Heat.

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Tires and Maintenance

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  1. Tires and Maintenance

  2. Tire Bursts and Damage • Tires burst from outboard right to left • Loud noises and physical motions First to burst at 137+ knots Last to burst

  3. Damage and Brake Loss • Tire fragments struck airplane • Brakes lost early in sequence

  4. 219 psi Tire Construction and Heat • Heavy loads, high speed, high pressure • Pressure loss about 2% per day (Learjet 60) • Flex creates heat • Nylon fibers found melted • Low pressure increases flex

  5. Loss of Inflation Pressure • Full inflation: 219 psi • At 2% inflation loss per day for this tire • After 8 days: 185 psi (requires replacement) • Low inflation not visually detectable • After 3 weeks: 140 psi(accident airplane) • Interview matched damaged inner liner • Inconsistencies in maintenance manuals

  6. Checking Inflation Pressure • Technically simple • FAA inconsistent about pilots checking • Tire Pressure Monitoring Systems (TPMS)

  7. Requirements: 14 CFR 25.733 • Major change in 1979 • Missing actual conditions include • No tests with camber • No tests with maximum allowable wear • Brake regulations changed • No tests at minimum permissible inflation • Test failures at 7 takeoff cycles (test conditions) of 10% underinflation and maximum rated load

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