skanza
Well-known member
- Joined
- Nov 17, 2006
- Posts
- 376
PROPER INFLATION PROCEDURES(CONT’D)
Mounted Tube-Type Tires
A tube-type tire that has been freshly mounted and installed should be closely monitored during the first
week of operation, ideally before every takeoff. Air trapped between the tire and the tube at the time of
mounting will seep out under the beads, through sidewall vents or around the valve stem, resulting in an
underinflated assembly.
Mounted Tubeless Tires
A slight amount of gas diffusion through the liner material and casing of tubeless tires is normal. The
sidewalls are purposely vented in the lower sidewall area to bleed off trapped gases, preventing separation
or blisters. A tire/wheel assembly can lose as much as five percent (5%) of the inflation pressure in a
24-hour period and still be considered normal. If a soap solution is used to check leaks, it is normal for
small amounts of bubbles to be observed coming from the vent holes.
COLD PRESSURE SETTING
The following recommendations apply to cold inflation pressure setting:
1. Minimum service pressure for safe aircraft operation is the cold unloaded inflation pressure specified by
the airframe manufacturer.
2. The loaded service inflation must be specified four percent (4%) higher than the unloaded inflation.
3. A tolerance of minus zero (-0) to plus five percent (+5%) of the minimum pressure is the recommended
operating range.
4. If “in-service” pressure is checked and found to be less than the minimum pressure, the following table
should be consulted. An “in-service” tire is defined as a tire installed on an operating aircraft.
PROCEDURES FOR HOT TIRE INFLATION PRESSURE CHECKS
When it is deemed necessary to make “hot” tire inflation pressure checks between normal 24 hourly
“cold” tire pressure checks, follow these procedures to identify any tire that has lost pressure faster than
its axle mate(s).
Cold Tire Service Pressure Recommended Action
100 to 105 percent of loaded service pressure None - normal cold tire operating range.
95 to less than 100 percent of loaded service pressure Reinflate to specified service pressure.
90 to less than 95 percent of loaded service pressure Inspect tire/wheel assembly for cause of pressure loss.
Reinflate & record in log book.
Remove tire/wheel assembly if pressure loss is greater
than 5% and reoccurs within 24 hours.
80 to less than 90 percent of loaded service pressure Remove tire/wheel assembly from aircraft
(See NOTE below).
Less than 80 percent of loaded service pressure Remove tire/wheel assembly and adjacent tire/wheel
assembly from aircraft (See NOTE below).
0 percent Scrap tire and mate if air loss occurred while rolling
(See NOTE below).
NOTE:
Any tire removed due to a pressure loss condition should be returned to an authorized repair
facility or retreader, along with a description of the removal reason, to verify that the casing has not24-HOURLY “COLD” TIRE PRESSURE CHECKS.
sustained internal degradation and is acceptable for continued service.
Do not approach a tire/wheel assembly that shows signs of physical damage which might
compromise its structural integrity. If such conditions exist refer to operator safety procedures
for damaged tire/wheel assemblies.
THIS PROCEDURE DOES NOT REDUCE OR REPLACE THE NEED AND IMPORTANCE OF
What is the purpose of this post? Just curious...