CSI 5 | QUESTIONS AND ANSWERS | 2026 UPDATE | WITH COMPLETE SOLUTION
What are the three HYD systems called?
HYD Panel [Hydraulics] - (answer)Green, Blue and Yellow Systems
How is each hydraulic system normally powered?
HYD Panel [Hydraulics] - (answer)• GREEN - engine driven
• BLUE - electrically driven
• YELLOW - engine or electrically driven
When does the BLUE pump normally operate?
HYD Panel [Hydraulics] - (answer)After the first engine is started
If the BLUE system lost pressure, how would pressure be restored?
HYD Panel [Hydraulics] - (answer)• The RAT must be deployed. It does not deploy automatically upon
BLUE system loss of pressure, so it must be manually deployed with the RAT MAN ON pushbutton.
What can be done to correct low ACUM PRESS indication?
HYD Panel [Hydraulics] - (answer)On the ground, coordinate with ground personnel and turn on the
beacon and YELLOW ELEC pump
With no HYD system power, how can the FWD CARGO door be opened?
HYD Panel [Hydraulics] - (answer)By using a hand pump.
,CSI 5 | QUESTIONS AND ANSWERS | 2026 UPDATE | WITH COMPLETE SOLUTION
What causes the PTU to operate in if in AUTO?
HYD Panel [Hydraulics] - (answer)Differential pressure of 500 psi between GREEN and YELLOW systems
When is the PTU inhibited?
HYD Panel [Hydraulics] - (answer)• On the ground with master switches split and either the nose wheel
steering disconnected or the parking brake ON
• For 40 seconds after cargo door is operate
What are some users of the GREEN system?
HYD Panel [Hydraulics] - (answer)• Landing gear
• Normal brakes
• Slats and flaps
• ENG 1 thrust reverser
What are some users of the BLUE system?
HYD Panel [Hydraulics] - (answer)- Emergency generator.
- Slats.
What are some users of the YELLOW system?
HYD Panel [Hydraulics] - (answer)• Flaps
• Nose wheel steering
• Alternate brakes
, CSI 5 | QUESTIONS AND ANSWERS | 2026 UPDATE | WITH COMPLETE SOLUTION
What do the priority valves do in the HYD systems?
HYD Panel [Hydraulics] - (answer)Removes hydraulic power from the heavy users and protects the flight
controls.
What would cause a FAULT light in the ENG 1 pump?
HYD Panel [Hydraulics] - (answer)- Pump low pressure.
- Over temp in reservoir.
- Low air pressure in reservoir.
- Low quantity.
If the FAULT light illuminates in the ENG 1 pump, what would identify the
specific reason for the FAULT?
HYD Panel [Hydraulics] - (answer)ECAM will display the reason
What type of flight control system does the A320 family aircraft utilize?
Flight Controls & Flight Control Laws [Flight Controls] - (answer)• Fly-By-Wire system
Describe how the flight controls are controlled and activated.
Flight Controls & Flight Control Laws [Flight Controls] - (answer)Electrically Controlled and Hydraulically
Activated
How is NORMAL LAW indicated on the PFD?
What are the three HYD systems called?
HYD Panel [Hydraulics] - (answer)Green, Blue and Yellow Systems
How is each hydraulic system normally powered?
HYD Panel [Hydraulics] - (answer)• GREEN - engine driven
• BLUE - electrically driven
• YELLOW - engine or electrically driven
When does the BLUE pump normally operate?
HYD Panel [Hydraulics] - (answer)After the first engine is started
If the BLUE system lost pressure, how would pressure be restored?
HYD Panel [Hydraulics] - (answer)• The RAT must be deployed. It does not deploy automatically upon
BLUE system loss of pressure, so it must be manually deployed with the RAT MAN ON pushbutton.
What can be done to correct low ACUM PRESS indication?
HYD Panel [Hydraulics] - (answer)On the ground, coordinate with ground personnel and turn on the
beacon and YELLOW ELEC pump
With no HYD system power, how can the FWD CARGO door be opened?
HYD Panel [Hydraulics] - (answer)By using a hand pump.
,CSI 5 | QUESTIONS AND ANSWERS | 2026 UPDATE | WITH COMPLETE SOLUTION
What causes the PTU to operate in if in AUTO?
HYD Panel [Hydraulics] - (answer)Differential pressure of 500 psi between GREEN and YELLOW systems
When is the PTU inhibited?
HYD Panel [Hydraulics] - (answer)• On the ground with master switches split and either the nose wheel
steering disconnected or the parking brake ON
• For 40 seconds after cargo door is operate
What are some users of the GREEN system?
HYD Panel [Hydraulics] - (answer)• Landing gear
• Normal brakes
• Slats and flaps
• ENG 1 thrust reverser
What are some users of the BLUE system?
HYD Panel [Hydraulics] - (answer)- Emergency generator.
- Slats.
What are some users of the YELLOW system?
HYD Panel [Hydraulics] - (answer)• Flaps
• Nose wheel steering
• Alternate brakes
, CSI 5 | QUESTIONS AND ANSWERS | 2026 UPDATE | WITH COMPLETE SOLUTION
What do the priority valves do in the HYD systems?
HYD Panel [Hydraulics] - (answer)Removes hydraulic power from the heavy users and protects the flight
controls.
What would cause a FAULT light in the ENG 1 pump?
HYD Panel [Hydraulics] - (answer)- Pump low pressure.
- Over temp in reservoir.
- Low air pressure in reservoir.
- Low quantity.
If the FAULT light illuminates in the ENG 1 pump, what would identify the
specific reason for the FAULT?
HYD Panel [Hydraulics] - (answer)ECAM will display the reason
What type of flight control system does the A320 family aircraft utilize?
Flight Controls & Flight Control Laws [Flight Controls] - (answer)• Fly-By-Wire system
Describe how the flight controls are controlled and activated.
Flight Controls & Flight Control Laws [Flight Controls] - (answer)Electrically Controlled and Hydraulically
Activated
How is NORMAL LAW indicated on the PFD?
