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Skywest ERJ 175 Systems Questions with
Detailed Verified Answers
What kind of checklist is the Safety and Power Up? Ans: Captain or FO Read And Do
checklist
What is the minimum battery voltage for normal ops? Ans: 22.5V
What sources of external power are available to the ERJ 175? Ans: Both AC and DC
After turning on Batteries 1 and 2, which displays should come on? Ans: 2 and 3
What areas have fire detection and protection? Ans: Engines, APU, Cargo
Compartments both aft and fwd, Lavatories
When must the safety and power up checklist be performed? Ans: The first flight of
the day in a particular plane or when a power down was required.
Emergency Equipment Ans: Flashlight - both CA and FO, Life Vest - CA, FO and
jumpseat, Circuit Breakers - CA, FO, Escape Rope - CA, FO, Landing Gear and RAT
Safety Pin - FO, PBE & Halon Fire Extinguisher & Crash Axe - Doorway, Oxygen &
Headset - Observer Seat
What are you looking for when battery 1 on and battery 2 Auto Ans: 1) Screen 2
(status page) & 3 (EICAS) should illuminate 2) IESS powering up (90 sec alignment)
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3) Battery Voltage (Min 22.5V for normal ops, 21.0 - 22.5 Recharge procedure, less
than 20.9 - call maintenance)
What is the significance about 22.5V Ans: 22.5V should give enough power for 10
minutes of battery power with 2 APU restart attempts
What are we looking for when performing the Fire Extinguisher Test? Ans: 6 - 5 - 2
- 2 - 2 6-Lights on overhead panel, 5-EICAS messages, 2-Master Warnings, 2-ITT
Fires, 2-Aural Warnings
APU FADEC will shut off if: Ans: In-Flight: UFO U-underspeed, F-FADEC critical fault,
O-overspeed Ground: UFO SHELF S-sensor fail, H-high oil temp, E-EGT (high), L-low
oil pressure, F-fire
APU FADEC fire detection automatic Ans: On Ground: 10 seconds lag on shutting it
off. Anytime: 1 minute later the APU emergency stop button will light up.
Cargo Fire Halon Extinguisher How many? Differences? Usage? Ans: 2 Halon
Extinguishers, high-rate goes off when button pressed. low-rate keeps going off in
short spurts for 75 minutes.
Cargo fire extinguisher with EICAS message usage Ans: With message (IN FLIGHT)
the button will blow the high-rate and then 1 minute after the low-rate will discharge
automatically. (GROUND) pushing the button will blow the high-rate only. The button
has to be pushed again for the low-rate bottle.
Cargo fire extinguisher without EICAS message usage Ans: (IN FLIGHT) push the
button 2 times the low-rate is automatic. (GROUND) push the button 2 times and
only the high-rate goes off. Need to push the button 1 more time for low-rate bottle.
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What are the sources of electrical power Ans: DC Power - Battery, AC Power - GPU,
APU, IDG, When they all fail the RAC takes over.
What is the TRU? Ans: Transformer rectifier unit, converts AC to DC
APU Max Re-starting Altitude Ans: 30,000 ft
APU Max Operating Altitude Ans: 33,000 ft
Logic for AC powering up sources Ans: Onside - Inside - Outside - CrossSide
If receiving an airplane already powered up, what must be done with regard to the
Safety and PowerUp Checklist? Ans: It must be verified compliant and the fire panel
test must be accomplished.
What would you do if you discover a battery at 20.5V upon power up? Ans: Call
maintenance
After starting the left engine with the APU on, what generator will power AC Bus
2(Right Engine, Not Running)? Ans: APU Generator
Leaving the GPU button pressed in and after being disconnected from AC external
power will? Ans: Not allow you to reconnect to AC power until the button is
repressed in.
With a non-annunciated Aft Cargo fire on the ground, how many times do you need to
press the Aft Cargo button to discharge the low-rate fire bottle? Ans: Three
The originating flow is? Ans: Accomplished anytime maintenance has been
performed.
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All primary and secondary flight controls employ fly-by-wire technology except the
Ans: Ailerons
What is the alternate mode for flight control operation if the normal mode fails? Ans:
Direct Mode
The originating flow is accomplished on the first flight of the day? Ans: True
What is the primary purpose of the power transfer unit (PTU)? Ans: Assist in landing
gear extension and retraction
What are the primary flight controls? Ans: Ailerons which includes the multifunction
roll spoilers, Elevators, Rudder
What are the secondary flight controls? Ans: Horizontal Stabilizer, Flaps & Slats,
Multi-function spoiler, dedicated ground spoilers
What is the primary function and purpose for the FCM (flight control modules) Ans:
This is the brain - the computer that decides yes I'm going to do this, or not in
regards to moving the Rudder, Elevator, and Spoiler
What are the 4 ACE (Actuator Control Electronics) Ans: ACE is the signal box that
translates our control inputs into electronic signals for the PCU to perform. P-ACE
(primary) Rudder and Elevators S-ACE(spoiler) HS-ACE (horizontal stabilator) SF-ACE
(slat/flap)
Protections the FMS gives us Ans: 1) Elevator Thrust Compensation Function 2) AOA
Limiting - Stall Protection Activation 3) Multifunction Spoiler Operation Mode 4)
Rudder Control System Operation Mode 5) Yaw Damper
Skywest ERJ 175 Systems Questions with
Detailed Verified Answers
What kind of checklist is the Safety and Power Up? Ans: Captain or FO Read And Do
checklist
What is the minimum battery voltage for normal ops? Ans: 22.5V
What sources of external power are available to the ERJ 175? Ans: Both AC and DC
After turning on Batteries 1 and 2, which displays should come on? Ans: 2 and 3
What areas have fire detection and protection? Ans: Engines, APU, Cargo
Compartments both aft and fwd, Lavatories
When must the safety and power up checklist be performed? Ans: The first flight of
the day in a particular plane or when a power down was required.
Emergency Equipment Ans: Flashlight - both CA and FO, Life Vest - CA, FO and
jumpseat, Circuit Breakers - CA, FO, Escape Rope - CA, FO, Landing Gear and RAT
Safety Pin - FO, PBE & Halon Fire Extinguisher & Crash Axe - Doorway, Oxygen &
Headset - Observer Seat
What are you looking for when battery 1 on and battery 2 Auto Ans: 1) Screen 2
(status page) & 3 (EICAS) should illuminate 2) IESS powering up (90 sec alignment)
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3) Battery Voltage (Min 22.5V for normal ops, 21.0 - 22.5 Recharge procedure, less
than 20.9 - call maintenance)
What is the significance about 22.5V Ans: 22.5V should give enough power for 10
minutes of battery power with 2 APU restart attempts
What are we looking for when performing the Fire Extinguisher Test? Ans: 6 - 5 - 2
- 2 - 2 6-Lights on overhead panel, 5-EICAS messages, 2-Master Warnings, 2-ITT
Fires, 2-Aural Warnings
APU FADEC will shut off if: Ans: In-Flight: UFO U-underspeed, F-FADEC critical fault,
O-overspeed Ground: UFO SHELF S-sensor fail, H-high oil temp, E-EGT (high), L-low
oil pressure, F-fire
APU FADEC fire detection automatic Ans: On Ground: 10 seconds lag on shutting it
off. Anytime: 1 minute later the APU emergency stop button will light up.
Cargo Fire Halon Extinguisher How many? Differences? Usage? Ans: 2 Halon
Extinguishers, high-rate goes off when button pressed. low-rate keeps going off in
short spurts for 75 minutes.
Cargo fire extinguisher with EICAS message usage Ans: With message (IN FLIGHT)
the button will blow the high-rate and then 1 minute after the low-rate will discharge
automatically. (GROUND) pushing the button will blow the high-rate only. The button
has to be pushed again for the low-rate bottle.
Cargo fire extinguisher without EICAS message usage Ans: (IN FLIGHT) push the
button 2 times the low-rate is automatic. (GROUND) push the button 2 times and
only the high-rate goes off. Need to push the button 1 more time for low-rate bottle.
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What are the sources of electrical power Ans: DC Power - Battery, AC Power - GPU,
APU, IDG, When they all fail the RAC takes over.
What is the TRU? Ans: Transformer rectifier unit, converts AC to DC
APU Max Re-starting Altitude Ans: 30,000 ft
APU Max Operating Altitude Ans: 33,000 ft
Logic for AC powering up sources Ans: Onside - Inside - Outside - CrossSide
If receiving an airplane already powered up, what must be done with regard to the
Safety and PowerUp Checklist? Ans: It must be verified compliant and the fire panel
test must be accomplished.
What would you do if you discover a battery at 20.5V upon power up? Ans: Call
maintenance
After starting the left engine with the APU on, what generator will power AC Bus
2(Right Engine, Not Running)? Ans: APU Generator
Leaving the GPU button pressed in and after being disconnected from AC external
power will? Ans: Not allow you to reconnect to AC power until the button is
repressed in.
With a non-annunciated Aft Cargo fire on the ground, how many times do you need to
press the Aft Cargo button to discharge the low-rate fire bottle? Ans: Three
The originating flow is? Ans: Accomplished anytime maintenance has been
performed.
, Page | 4
All primary and secondary flight controls employ fly-by-wire technology except the
Ans: Ailerons
What is the alternate mode for flight control operation if the normal mode fails? Ans:
Direct Mode
The originating flow is accomplished on the first flight of the day? Ans: True
What is the primary purpose of the power transfer unit (PTU)? Ans: Assist in landing
gear extension and retraction
What are the primary flight controls? Ans: Ailerons which includes the multifunction
roll spoilers, Elevators, Rudder
What are the secondary flight controls? Ans: Horizontal Stabilizer, Flaps & Slats,
Multi-function spoiler, dedicated ground spoilers
What is the primary function and purpose for the FCM (flight control modules) Ans:
This is the brain - the computer that decides yes I'm going to do this, or not in
regards to moving the Rudder, Elevator, and Spoiler
What are the 4 ACE (Actuator Control Electronics) Ans: ACE is the signal box that
translates our control inputs into electronic signals for the PCU to perform. P-ACE
(primary) Rudder and Elevators S-ACE(spoiler) HS-ACE (horizontal stabilator) SF-ACE
(slat/flap)
Protections the FMS gives us Ans: 1) Elevator Thrust Compensation Function 2) AOA
Limiting - Stall Protection Activation 3) Multifunction Spoiler Operation Mode 4)
Rudder Control System Operation Mode 5) Yaw Damper
