AVIT 428 Block 3 Exam Questions and Answers Fully Solved
How many hydraulic systems are there? - Answers 3
System A, B and Standby
How do you control hydraulics? - Answers Hydraulic Panel on FO side
What kind of pumps are part of A, B, and Standby? - Answers A and B: engine driven and electric
pump
Standby: Just electric pump
Explain System A hydraulics - Answers Engine 1 pump and electric pump
Both operate at same time
Controls various flight controls and gear
Explain System B hydraulics - Answers Engine 2 pump and electric pump
Various controls and brake
How do you manually activate the Standby hydraulics? - Answers Set FLT Control switch to
STBY RUD
ALTERNATE FLAPS to ARM
How does the Standby hydraulic system automatically turn on? - Answers Loss of A or B
Flaps extended
In flight or >60 kts
FLT Control Switch A or B is ON
What does the Standby hydraulic system power? - Answers Rudder
Flaps
Thrust Reverser
Yaw damper
How many reservoirs are there on the aircraft? - Answers 3
, A, B or Standby
What is the standby reservoir connected to? How do we know it is low? - Answers Connected to
reservoir B in order to be filled as needed
Low oil quantity display if reservoir is too low
What is a standpipe? - Answers Prevents full loss of pressure if there is a leak in reservoir A
Provides for Power Transfer Unit in reservoir B
What PSI are the engine driven pumps? Electric? - Answers Both 3,000 PSI
What are the normal hydraulic pressures? Max? min? - Answers Normal: 3,000
Max: 3,5000
Preflight minimum: 2,800
What is the power transfer unit? (PTU) - Answers Uses fluid from A to drive a pump which
pressurizes B if engine pump failed
How are the ailerons controlled? - Answers Power Control Unit (PCU)
Aileron feel and centering unit attached to autopilot
How are the flight spoilers controlled? - Answers Hydraulic system A and B control their own
spoilers
Spoiler Mixer: Controls spoilers proportional to ailerons
What is the aileron transfer mechanism? - Answers Isolates 1 control wheel in case of a jam
How are the elevators controlled? What is manual reversion? - Answers PCU
Also has elevator feel system
Manual reversion: elevator still works in case of hydraulic failure
How is the horizontal stabilizer controlled? - Answers Electric trim motor
Also manual trim wheels
How many hydraulic systems are there? - Answers 3
System A, B and Standby
How do you control hydraulics? - Answers Hydraulic Panel on FO side
What kind of pumps are part of A, B, and Standby? - Answers A and B: engine driven and electric
pump
Standby: Just electric pump
Explain System A hydraulics - Answers Engine 1 pump and electric pump
Both operate at same time
Controls various flight controls and gear
Explain System B hydraulics - Answers Engine 2 pump and electric pump
Various controls and brake
How do you manually activate the Standby hydraulics? - Answers Set FLT Control switch to
STBY RUD
ALTERNATE FLAPS to ARM
How does the Standby hydraulic system automatically turn on? - Answers Loss of A or B
Flaps extended
In flight or >60 kts
FLT Control Switch A or B is ON
What does the Standby hydraulic system power? - Answers Rudder
Flaps
Thrust Reverser
Yaw damper
How many reservoirs are there on the aircraft? - Answers 3
, A, B or Standby
What is the standby reservoir connected to? How do we know it is low? - Answers Connected to
reservoir B in order to be filled as needed
Low oil quantity display if reservoir is too low
What is a standpipe? - Answers Prevents full loss of pressure if there is a leak in reservoir A
Provides for Power Transfer Unit in reservoir B
What PSI are the engine driven pumps? Electric? - Answers Both 3,000 PSI
What are the normal hydraulic pressures? Max? min? - Answers Normal: 3,000
Max: 3,5000
Preflight minimum: 2,800
What is the power transfer unit? (PTU) - Answers Uses fluid from A to drive a pump which
pressurizes B if engine pump failed
How are the ailerons controlled? - Answers Power Control Unit (PCU)
Aileron feel and centering unit attached to autopilot
How are the flight spoilers controlled? - Answers Hydraulic system A and B control their own
spoilers
Spoiler Mixer: Controls spoilers proportional to ailerons
What is the aileron transfer mechanism? - Answers Isolates 1 control wheel in case of a jam
How are the elevators controlled? What is manual reversion? - Answers PCU
Also has elevator feel system
Manual reversion: elevator still works in case of hydraulic failure
How is the horizontal stabilizer controlled? - Answers Electric trim motor
Also manual trim wheels
