Endeavor CRJ900 systems: Pneumatics, Ice +
Rain, ECS Exam with Multiple Choice Questions
and Verified Answers 100% A+ Graded
Name the aircraft functions that use pressurized bleed air: - CORRECT ANSWER -4th stage:
pressurizes oil reservoir, 6th and 10th stage and APU feed into the
common bleed manifold for Anti-Ice, ECS and Engine Starts.
If the High Pressure Valve (HPV) opens, will the system
continue to supply 6th stage air to the manifold? - CORRECT ANSWER -No, there are check
valves in place that prevent the 10th stage air from
going back into the 6th stage ports.
With the APU running, and the BLEED VALVES selector
to the AUTO position, what will be the primary bleed
source on the ground? - CORRECT ANSWER -APU under normal conditions, if Anti-Ice is
selected on, then it will switch to the engines.
When will the bleed valve source switch from the APU to
the engines on the ground in AUTO? - CORRECT ANSWER -Anti-Ice on, or if the
APU is not ready to load, or for some reason can not support the air load.
You takeoff with the APU on and the anti-ice off, when will
the bleed valves switch automatically from the APU to the
engines? - CORRECT ANSWER -Takeoff Bit set - Flaps ≤ 20°, Gear is up and Thrust levers
retarded from the TOGA detent.
, On approach you turn on the APU, assuming you are not
using anti-ice, when will the bleed valves source switch from
the engines back to the APU? - CORRECT ANSWER -When the Approach Bit is set: Gear
Down or Flaps > 20°.
Which valves does ACSC 1 (2) control? - CORRECT ANSWER -ACSC 1: Left PRSOV and HPV, APU
Load Control Valve^("asks" ECU), and Bleed Isolation Valve.^
ACSC2:
Right PRSOV and HPV, Aft cargo temp/heater
^ACSC2 can control if 1 failed
Describe APU LCV "Interlock" protection: - CORRECT ANSWER -LCV is protected if an engine
bleed is commanded to open, then the LCV
will shut to protect the APU from backflow issues.
Which pneumatic valves will close following the selection of either ENG FIRE PUSH switchlights?
- CORRECT ANSWER -PRSOV and HPV
What would cause a L (R) ENG BLEED caution message to
appear? - CORRECT ANSWER -ACSC fault, HPV fault, PRSOV fault
Name all of the things that would cause the EBVs to close: - CORRECT ANSWER -Auto-close:
ACSC Signal lost, fire signal, engine lost, leak, loss of DC, valve fail
Rain, ECS Exam with Multiple Choice Questions
and Verified Answers 100% A+ Graded
Name the aircraft functions that use pressurized bleed air: - CORRECT ANSWER -4th stage:
pressurizes oil reservoir, 6th and 10th stage and APU feed into the
common bleed manifold for Anti-Ice, ECS and Engine Starts.
If the High Pressure Valve (HPV) opens, will the system
continue to supply 6th stage air to the manifold? - CORRECT ANSWER -No, there are check
valves in place that prevent the 10th stage air from
going back into the 6th stage ports.
With the APU running, and the BLEED VALVES selector
to the AUTO position, what will be the primary bleed
source on the ground? - CORRECT ANSWER -APU under normal conditions, if Anti-Ice is
selected on, then it will switch to the engines.
When will the bleed valve source switch from the APU to
the engines on the ground in AUTO? - CORRECT ANSWER -Anti-Ice on, or if the
APU is not ready to load, or for some reason can not support the air load.
You takeoff with the APU on and the anti-ice off, when will
the bleed valves switch automatically from the APU to the
engines? - CORRECT ANSWER -Takeoff Bit set - Flaps ≤ 20°, Gear is up and Thrust levers
retarded from the TOGA detent.
, On approach you turn on the APU, assuming you are not
using anti-ice, when will the bleed valves source switch from
the engines back to the APU? - CORRECT ANSWER -When the Approach Bit is set: Gear
Down or Flaps > 20°.
Which valves does ACSC 1 (2) control? - CORRECT ANSWER -ACSC 1: Left PRSOV and HPV, APU
Load Control Valve^("asks" ECU), and Bleed Isolation Valve.^
ACSC2:
Right PRSOV and HPV, Aft cargo temp/heater
^ACSC2 can control if 1 failed
Describe APU LCV "Interlock" protection: - CORRECT ANSWER -LCV is protected if an engine
bleed is commanded to open, then the LCV
will shut to protect the APU from backflow issues.
Which pneumatic valves will close following the selection of either ENG FIRE PUSH switchlights?
- CORRECT ANSWER -PRSOV and HPV
What would cause a L (R) ENG BLEED caution message to
appear? - CORRECT ANSWER -ACSC fault, HPV fault, PRSOV fault
Name all of the things that would cause the EBVs to close: - CORRECT ANSWER -Auto-close:
ACSC Signal lost, fire signal, engine lost, leak, loss of DC, valve fail
