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Endeavor CRJ900/700 SYSTEMS (Workbook) Pneumatics, Ice+Rain, ECS
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Endeavor CRJ900/700 SYSTEMS (Workbook) Pneumatics, Ice+Rain, ECS
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Endeavor CRJ900/700 SYSTEMS (Workbook)Pneumatics, Ice+Rain, ECS
Name the aircraft functions that use pressurized bleed air: ✔️Ans - 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? ✔️Ans - 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? ✔️Ans - 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? ✔️Ans - 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? ✔️Ans - 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? ✔️Ans - When the Approach Bit is set: Gear
Down or Flaps > 20°.
Which valves does ACSC 1 (2) control? ✔️Ans - 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: ✔️Ans - 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? ✔️Ans - PRSOV and HPV
What would cause a L (R) ENG BLEED caution message to
appear? ✔️Ans - ACSC fault, HPV fault, PRSOV fault
Name all of the things that would cause the EBVs to close: ✔️Ans - Auto-
close: ACSC Signal lost, fire signal, engine lost, leak, loss of DC, valve fail
What are the five isolation zones of the Bleed Air Leak
Detection System? ✔️Ans - Wing Zone, R/L Engine Bleed Zones, R/L Cowl
Zones
How will the AILC automatically respond to a bleed air
leak? ✔️Ans - Tries to close the source valve for the leak to isolate it.
Which valves open during engine start? ✔️Ans - Air Turbine Starter
Which valves automatically close during engine start? ✔️Ans - Flow
control valves (pack control valves) and anti-ice valves close
What is the difference between automatic and manual
temperature control? ✔️Ans - Auto = ACSC controls temp outputs and
keeps the packs within safe upper and lower temp limits.
Manual = directly control valve positions. No protection.
List everything that would happen, including the
indications, after pressing EMER DEPRESS at FL250: ✔️Ans - Emer
Depress Caution,
8500ft = Cabin Alt Caution
10,000ft = Cabin Alt Warning with Aural, pax signs in auto
14,000ft ± 300 = Rubber jungle with Caution message
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