What is the maximum operating altitude for JP-4 or JET B fuel?

The maximum operating altitude for JP-4 or JET B fuel is established based on their properties and performance characteristics in aviation. JP-4 and JET B are fuels that have specific volatility and freezing point ranges, which influence their use in high-altitude conditions.

At altitudes above 16,000 feet, the low temperatures encountered can lead to fuel icing and poor combustion due to the reduced pressure and temperature conditions. Both JP-4 and JET B have been rated for effective performance up to this altitude, ensuring reliable operation of the aircraft engines powered by these fuels under typical operating conditions. Therefore, the maximum safe limit for their use is capped at 16,000 feet, making this the accurate answer.

In contrast, the other altitude options provided either exceed this maximum safe altitude for these specific fuels or do not apply to their operational limitations, which can result in performance issues if attempted.