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How many hydraulic systems are on the airplane?
- 3 independent systems
- 1, 2 and 3
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What systems use hydraulic power?
- Flight controls
- Spoilers
- Landing gear
- Nose wheel steering
- Wheel brakes
- Thrust reverser
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Can hydraulic fluid be transferred between systems?
No
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How many hydraulic pumps are on the aircraft?
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How many electric hydraulic pumps are used for each system?
- System 1 and 2 each have 1 electric pump
- System 3 has 2
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The ERJ operates at what nominal pressure?
3000psi
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How long after powerup before any hydraulic pumps should be turned on and why?
3 mins, to allow pbit to complete the test
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What is the primary and backup power source for each system?
- EDP primary, ACMP backup
- Sys 3 A is primary, B is backup
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When will AC Electric pump 1 or 2 automatically activate?
- Ground
- Flaps greater than zero or
- Ground speed greater than 50kts
- Flight
- Engine or EDP failure or
- Flaps greater than zero
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Can we disable the engine driven hydraulic pump? What is the importance of this?
If the sys 1 or sys 2 engine pump shutoff button is pushed, it will isolate the engine driven pump from the rest of the system, but will continue to run. This could result in the engine getting hot
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What happens when you push the sys 1 or sys 2 ENGINE PUMP SHUTOFF guarded buttons?
Closes the hydraulic SOV, isolates the respective EDP from the hydraulic system.
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What is the PTU, how does it work and why?
- Power Transfer Unit
- Pump is Sys 2 driven with by a pump in Sys 1
- It assists the landing gear retraction and extension in the event of an Eng 2 or EDP 2 failure
- No transfer of hydraulic fluid occurs
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What conditions must be met for the PTU to automatically activate during TO and Landing?
- Engine 2 or EDP 2 fails
- Flaps not set to 0 or landing gear not up and locked
- EDP 1 not fail
- Hydraulic reservoir 2 qty above 12%
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Why do we need a PTU when the #2 electric pump is the backup to the #2 EDP?
To assist with landing gear in the event EDP 2 or ENGINE 2 fails.
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Will the PTU work on the ground?
No
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What is the primary purpose of HYD Sys 3?
Backup for the flight controls
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Why are HYD ACMP 3A and 3B switch On and Auto respectively?
- 3A pump is primary and has no automation
- 3B pump is backup and automatically activates when in the auto position
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What is the purpose of ELEC PUMP 1 and 2?
Backup to the respective EDP
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What does the ON position do on HYD SYS 1 and 2 ELEC PUMP knob?
Overrides the system logic and turns the pump on
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Which HYD pumps are automatically switched on for TO and LAND?
System 1 and 2
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In an electrical emergency what provides hydraulic pressure to the flight controls until the RAT comes online?
- HYD sys 3 accumulator
- After 8 sec, the RAT will power ACMP 3A
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What, if any, HYD ACMP will function if the RAT is the only power source?
HYD ACMP 3A
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Using RAT power, if HYD sys 3A fails, will 3B operate?
No, it will not be powered by the RAT
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What are the items that are different on HYD SYS 2 from HYD SYS 1?
- Nose wheel steering
- Inboard brakes
- Landing gear
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The hydraulic pbit will run when?
All 3 hydraulic reservoirs are 10C or above and the hydraulic system is pressurized
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What will interrupt the hydraulic pbit?
Moving the flight controls
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Hydraulic system 3 powers which flight controls?
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During cold weather operations, if PBIT countdown timer has reached 25 Hrs or less. What is required after shutdown at the arrival gate?
Perform a hydraulic PBIT test
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When must a hydraulic warmup be accomplished?
First flight of the day at temps below minus 18F
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