Pneumatics

Question 1

What is the purpose of the Bleed Switching Valve:

Answer 1

A pneumatically operated valve that is normally open, that receives HP and LP bleed air from compressor section of the engine. The valve provides an output of combined bleed air to maintain pressure within a specified pressure range, using HP bleed air at a minimum.

Question 2

Does the Cabin Door Seal use HP or LP air:

Answer 2

HP

Question 3

Besides the Cabin Door Seal what other systems use HP air:

Answer 3

NAC A/I, Right engine BYPASS AIR and on either engine will augment pressure and temperature demands for the environmental system

Question 4

What systems use LP air:

Answer 4

Air Conditioning and Pressurization, EMER pressurization, Pneumatic Boots, Boot Suction Ejector, Pressurization Ejector, Hydraulic Reservoir pressure

Question 5

How do you know if you have a Bleed Air duct high temperature:

Answer 5

The BLEED HI PRESS annunciator light will illuminate

Question 6

How would you know if a bleed air overpressure occurred in the pylon:

Answer 6

An ITT rise of 20 to 30 deg C would occur on the respective engine and the silver blowout plug would be blown out