Pneumatics Flashcards
True or False: The Pneumatics system provides air for airstair door seal pressurization?
True
True or False: The Pneumatics Electronic Control Unit (ECU) uses left and right digital channels for control with no associated backup channels.
False
Prior to engine start, what source provides bleed air for the pneumatic system?
APU
When BLEED 1 or BLEED 2 switches are selected OFF, what is the result in the associated bleed air system?
- The nacelle SOV closes
- HP SOV closes
How many engine bleed ports are used to supply bleed air to the pneumatic system?
2 for each engine
After engine start, bleed air is primarily provided by what sources?
Left and Right Engines
True or False: Bleed air is continuously supplied to the deicing system, regardless of flightdeck bleed switch positions.
True
True or False: If the DC starter/generator were to fail, the engines can still be started using APU bleed air.
False
If one or more protective bleed air sensors exceed normal values, what will the ECU system do?
Takes source offline by closing SOV
The ECU and _____ are used to determine whether the HP port or the LP port will be used for bleed air.
Power Lever Position
During lower power settings, the ECU uses which port(s) for bleed air?
HP Port
During higher power settings, the ECU uses which port(s) for bleed air?
LP Port
Prior to engine start, the bleed control switches should be in the _____ position?
Off
When the engines are running, the bleed control switches should be set to what position?
1 and 2 ON
How many different positions are there on the bleed flow control selector?
3
