ENDEAVOR 9E CRJ 900 SYSTEMS ORAL EXAM
2026 WITH VERIFIED QUESTIONS AND
ANSWERS|| GUARANTEED PASS
How many ICE detectors are on the airplane, and how do they go about
reporting ice? - ANSWER-Two. They vibrate at a specific frequency. As ice
collects on them, they frequency slows down until at a specific point it triggers
ice detected and you get an ICE Caution message (if not protected) or ICE
Advisory message (if protection on)
What would cause you to get an "ICE" Caution message and the "ICE"
switchlight to illuminate? - ANSWER-Ice detection system detects ice without
having the Ice Protection Systems active you get the Caution.
What fire protection/smoke detectors do we have? - ANSWER-Wing: dual
loop, last two feet temp sensors.
Engine/Bleed ducts: dual loop + extinguish
APU: dual loop + extinguish
Cowl anti-ice duct: pressure transducer
MLG bay: single loop
Cargo: smoke detectors (3 front, 2 aft). 2 extinguishers, one fast, one slow must
use both on fwd or aft.
LAV: smoke detectors, automatic trash bin extinguishers
How long do pax have until oxygen depleted? - ANSWER-13 minutes
,How do you know proper amount of oxygen to depart with? - ANSWER-Look
at table in ODH (operational data handbook)
CFM CH2 limitations
When would you turn windshield heat to high? - ANSWER-to deice windshield
Describe how the Cargo bottles function: - ANSWER-There are two bottles, a
fast and a slow discharge rate. Both fire at the same time into a single cargo
compartment. The fast discharge should put out the flames and the slow
discharge will keep the flames suppressed for up to 60 min.
How many scavenge pumps are there per wing? - ANSWER-2
What is the only way to close the fuel SOV's? - ANSWER-Fire pushlight
You takeoff with the APU on and the anti-ice off, when will the bleed valves
switch automatically from the APU to the engines? - 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? -
ANSWER-When the Approach Bit is set: Gear
Down or Flaps > 20°.
What would cause a L (R) ENG BLEED caution message to appear? -
ANSWER-ACSC fault, HPV fault, PRSOV fault
Name all of the things that would cause the EBVs to close: - ANSWER-Auto-
close: ACSC Signal lost, fire signal, engine lost, leak, loss of DC, valve fail
,What is the difference between automatic and manual temperature control?
What can trigger amber pack light? - ANSWER-Auto = ACSC controls temp
outputs and keeps the packs within safe upper and lower temp limits.
Manual = directly control valve positions. No protection.
Overtemp/pressure can trigger amber pack light.
List everything that would happen, including the indications, after pressing
EMER DEPRESS at FL250: - ANSWER-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
14,500 ± 500 = Cabin Alt limiter holds cabin alt.
How many pressure controllers are there? Active when? How do you know
which is active? - ANSWER-2, only one active at a time. ECS synoptic page:
"PRESS CONT 1" or "PRESS CONT 2"
When will the pressure controllers change automatically? How can you change
them manually? - ANSWER-If one fails, and on each landing. "PRESS CONT"
switch twice to manually change.
If the CPAM-like microprocessor should fail, which of the
CPAM functions will be lost? - ANSWER-Auto Pax O2 drop, Auto Pax sign
What is the difference between DIFF PRESS and CABIN ALT? - ANSWER-
Diff press: Diff Press >8.6, overpressurizing.
Cabin ALT caution: Cabin ALT >8500 feet
Cabin ALT warning: Cabin ALT >10,000 feet
, (14000 feet CPAM deploys pax oxy masks)
How can you determine the level of the potable water system? How many
tanks? - ANSWER-FULL/EMPTY indicator light at the
forward galley.
1 forward galley sink
compartment, 1 tail section heated. Serviced through external service panel
How would you disable a GPS receiver? - ANSWER-FMS: Index page, GNSS
control, Select L1/L2 to deselect GPS
Which windshields / windows would be heated following a
loss of all normal AC generators? - ANSWER-Captain's side window only.
What is AILC? - ANSWER-Anti-ice and Leak Detection
-Controls wing anti-ice and cross bleed valves
-Monitors and automatically isolates wing/fuselage leak/overheats
-Controls cowl anti-ice and gives alerts
-Can request ACSC to close valves in case of leak
What is ADSHC? - ANSWER-Air Data Sensor and Heater Controllers
-Probes/Vanes
-3 controllers: (1): Mostly left (2) Mostly right (3) standby
What is CPC? - ANSWER-Cabin Pressure Controllers
2026 WITH VERIFIED QUESTIONS AND
ANSWERS|| GUARANTEED PASS
How many ICE detectors are on the airplane, and how do they go about
reporting ice? - ANSWER-Two. They vibrate at a specific frequency. As ice
collects on them, they frequency slows down until at a specific point it triggers
ice detected and you get an ICE Caution message (if not protected) or ICE
Advisory message (if protection on)
What would cause you to get an "ICE" Caution message and the "ICE"
switchlight to illuminate? - ANSWER-Ice detection system detects ice without
having the Ice Protection Systems active you get the Caution.
What fire protection/smoke detectors do we have? - ANSWER-Wing: dual
loop, last two feet temp sensors.
Engine/Bleed ducts: dual loop + extinguish
APU: dual loop + extinguish
Cowl anti-ice duct: pressure transducer
MLG bay: single loop
Cargo: smoke detectors (3 front, 2 aft). 2 extinguishers, one fast, one slow must
use both on fwd or aft.
LAV: smoke detectors, automatic trash bin extinguishers
How long do pax have until oxygen depleted? - ANSWER-13 minutes
,How do you know proper amount of oxygen to depart with? - ANSWER-Look
at table in ODH (operational data handbook)
CFM CH2 limitations
When would you turn windshield heat to high? - ANSWER-to deice windshield
Describe how the Cargo bottles function: - ANSWER-There are two bottles, a
fast and a slow discharge rate. Both fire at the same time into a single cargo
compartment. The fast discharge should put out the flames and the slow
discharge will keep the flames suppressed for up to 60 min.
How many scavenge pumps are there per wing? - ANSWER-2
What is the only way to close the fuel SOV's? - ANSWER-Fire pushlight
You takeoff with the APU on and the anti-ice off, when will the bleed valves
switch automatically from the APU to the engines? - 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? -
ANSWER-When the Approach Bit is set: Gear
Down or Flaps > 20°.
What would cause a L (R) ENG BLEED caution message to appear? -
ANSWER-ACSC fault, HPV fault, PRSOV fault
Name all of the things that would cause the EBVs to close: - ANSWER-Auto-
close: ACSC Signal lost, fire signal, engine lost, leak, loss of DC, valve fail
,What is the difference between automatic and manual temperature control?
What can trigger amber pack light? - ANSWER-Auto = ACSC controls temp
outputs and keeps the packs within safe upper and lower temp limits.
Manual = directly control valve positions. No protection.
Overtemp/pressure can trigger amber pack light.
List everything that would happen, including the indications, after pressing
EMER DEPRESS at FL250: - ANSWER-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
14,500 ± 500 = Cabin Alt limiter holds cabin alt.
How many pressure controllers are there? Active when? How do you know
which is active? - ANSWER-2, only one active at a time. ECS synoptic page:
"PRESS CONT 1" or "PRESS CONT 2"
When will the pressure controllers change automatically? How can you change
them manually? - ANSWER-If one fails, and on each landing. "PRESS CONT"
switch twice to manually change.
If the CPAM-like microprocessor should fail, which of the
CPAM functions will be lost? - ANSWER-Auto Pax O2 drop, Auto Pax sign
What is the difference between DIFF PRESS and CABIN ALT? - ANSWER-
Diff press: Diff Press >8.6, overpressurizing.
Cabin ALT caution: Cabin ALT >8500 feet
Cabin ALT warning: Cabin ALT >10,000 feet
, (14000 feet CPAM deploys pax oxy masks)
How can you determine the level of the potable water system? How many
tanks? - ANSWER-FULL/EMPTY indicator light at the
forward galley.
1 forward galley sink
compartment, 1 tail section heated. Serviced through external service panel
How would you disable a GPS receiver? - ANSWER-FMS: Index page, GNSS
control, Select L1/L2 to deselect GPS
Which windshields / windows would be heated following a
loss of all normal AC generators? - ANSWER-Captain's side window only.
What is AILC? - ANSWER-Anti-ice and Leak Detection
-Controls wing anti-ice and cross bleed valves
-Monitors and automatically isolates wing/fuselage leak/overheats
-Controls cowl anti-ice and gives alerts
-Can request ACSC to close valves in case of leak
What is ADSHC? - ANSWER-Air Data Sensor and Heater Controllers
-Probes/Vanes
-3 controllers: (1): Mostly left (2) Mostly right (3) standby
What is CPC? - ANSWER-Cabin Pressure Controllers
