Aircraft General Knowledgemedium#394
High-pressure bleed air from engines must be regulated because:
A
It is too cold
B
It is at excessive temperature and pressure for pneumatic consumers
CorrectC
It contains oil contamination
D
It has insufficient volume
Explanation
Engine bleed air can exceed 400°C and 50 psi; it must be regulated (cooled and pressure-reduced) before use.
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