Systems Questions Flashcards
When is APR armed?
Weight on wheels Engine Speed switches ON N1 above 79% N1 speed control operating Both DCUs
What is the purpose of APU interlock protection?
What is the sequence for transferring bleeds from APU to engine (bleeds closed takeoff)?
Engine bleeds to APU bleeds?
To protect the APU from back flow from the engine 10th stage.
APU to engine: right 10th - ISOL - left 10th - APU LCV
Engine to APU: APU LCV - left 10th - ISOL - right 10th
What happens when either ENG FIRE PUSH button is pressed?
Fuel SOV closes Hydraulic SOV closes Bleed SOV closes Trips GEN off Arms squibs
What does SSP stand for and what does it control?
Source Select Panel - will unlock ED 1 or ED 2 should one display fail so more than just e primary page can be displayed.
What is the DRP and what does it do?
The Display Reversionary Panel and it is used to select either an additional EICAS display or PFD display on the MFD
What is the ECP
EICAS Control Panel and is used to control the secondary EICAS display.
Explain boost pump logic
Two conditions must be met: pump switch must be armed and must have low pressure in that sides fuel feed manifold; if both are met, then the pump will turn on and if one is on, they are both on. All logic for one pump must be met. If half the logic is met for one and the other half is met for the other pump, they will not turn on.
How long is APR armed for and how long will it be engaged after firing?
Armed for 5 minutes and will be engaged for an additional 5 minutes after firing.
How much will APR boost N1?
2% above the current thrust setting.
If you take off reduced thrust, APR will NOT increase thrust to max allowable. APR will only increase thrust to 2% above the reduced thrust setting.
When is N1 speed control engaged?
Engine speed switches must be on and N1 above 79%
N2 speed control is always available. Below 79% N1, N2 speed control is in use.
