The geometry of the main landing gear leg and the pivoting four wheel bogie beam changes during retraction or extension. The angle of the bogie beam with respect to the leg assembly is driven by
The crew oxygen system provides oxygen to the cockpit crew consist of
a fix high pressure source and a low pressure distribution
The masks presented to the passengers in case of cabin decompression provide
The purpose of the pneumatic system is to supply aircraft users with pressurized air. Mention 3 aircraft users.
What are the sources to supply high pressure air?
What is the purpose of the Precooler?
The precooler is an air to air heat exchanger. The cold fan air flow crosses the hot air for cooling reasons. The Fan Air Valve pneumatically regulates the fan air flow to the precooler.
What is the purpose of the APU?
The APU is an independent source for pneumatic and electrical power.
How is the APU started?
APU Battery driven electrical starter