Tire pressure check is not required if correct tire pressure was determined within the last how many hours?

• A. 24 hours
• B. 72 hours
• C. 48 hours
• D. 96 hours

Answer: (B)

The key idea is that tire pressure readings have a validity window. If the correct tire pressure was determined within the last 72 hours and nothing about the tires or conditions has changed, you do not need to perform a new tire pressure check before towing. This 72-hour window reflects a balance between safety and efficiency: pressures can drift with temperature, load, or minor tire settling, but within that period the prior measurement is still acceptable for operation. If factors such as a change in load, ambient temperature extremes, tire damage, or air leaks occur, or the aircraft has undergone maintenance or movement that could affect pressure, you should recheck the pressures. The other time frames are either too aggressive or too lax for typical operations, whereas 72 hours provides the standard that supports safe towing without unnecessary rechecks.