Operation (figs. 1-8 and 1-9).
The bleed air flows from
the prioritization regulating valve to the precooler at a
pressure up to 44 ƒ5 psi and flows through passageways
capabilities. The cooling air (ambient) flows from the fan
the cooling air flow to bleed air flow has a ratio of 3:1,
and at minimum the ratio drops to approximately 1:1.
Precooler Fin Geometries.