AW 139 Hydraulics Flashcards
When is the Hydraulic Utilities Shut-Off Valve (SOV) closed?
When there is an oil leak (automatically when there is an oil leak)
When setting the Shut-Off Valve (SOV) 1 switch on the Hydraulic Control Panel to CLOSE, what cautions are displayed?
1 SERVO, 1 HYD OIL PRESS
When setting the Shut-Off Valve (SOV) 2 switch on the Hydraulic Control Panel to CLOSE, what cautions are displayed?
2 SERVO, 2 HYD OIL PRESS
In case of failure of Hydraulic Pump #2, what cautions are displayed?
2 HYD PUMP
In case of failure of Hydraulic Pump No.1, what cautions are displayed?
1 HYD PUMP, 1 SERVO, 1 HYD OIL PRESS, EMERG LDG PRESS
What is the effective recovering action after receiving a HYD UTIL PRESS caution?
SOV 1 and SOV 2 switches on the Hydraulic Control Panel are ineffective (are not relevant to recovery the malfunction)
What would be the pressure indication on the Hydraulic System #1, with the Hydraulic Control Panel Shut-Off Valve (SOV) #1 set to CLOSE ?
About 207 bar
What condition will allow the Shut-Off Valve (SOV) 1 to CLOSE?
Tail Rotor Shut-Off Valve (TRSOV) valve is open
What action should be carried out after a 2 HYD PUMP caution?
Continue flight
What is the main function of the Hydraulic Electric Pump?
Provides flight controls freedom of movement check
Which caution could be displayed with the 1 SERVO caution?
EMER LDG PRESS in case of loss of pressure on the system
What is the recovering action in case of 2 SERVO caution?
Land as soon as practicable
Which of the following conditions could illuminate the 2 SERVO caution ?
The control valve in a servoactuator is jammed or loss of pressure on the system
After setting the SOV switch on the Hydraulic Control Panel to No.1 CLOSE, what cautions are displayed?
1 SERVO, 1 HYD OIL PRESS
If the SOV 1 switch on the Hydraulic Control Panel has been set to CLOSE and there is a subsequent drop of pressure on system 2:
The SOV switch is automatically reset
Pressure on system 1 is reinstated
On PCM 1 the utilities shut-off valve is closed by the following microswitch(es):
MIN (22%)
The pressure transducers in the PCM is located:
Before F/C shut-off valve, before utilities shut-off valve
TRSOV in the Hydraulic Circuit 2 is closed by the following microswitch(es) in the PCM 2 reservoir:
LOW 2 (28%)
On PCM 1 the utilities shutt-off valve is closed by the following microswitch(es):
MIN (22%)
LOW 2 (28%) microswitch in the PCM 2 provides the following:
Opens utilities shut-off, closes TRSOV
The pressure transducer in the PCM is located:
Before F/C shut-off valve, before utilities shut-off valve
In case of 2 HYD PUMP caution:
Continue flight
In case of 1 HYD PUMP caution:
Land as soon as practicable
In case of 4 HYD PUMP caution:
Continue flight
The hydraulic Electrical Pump:
Is provided with an overheating switch
Once pressed the ON pushbutton to operate the hydraulic Electrical Pump, the pushbutton:
Is automatically switched off after two minutes
In the Hydraulic Circuit 2 the TRSOV solenoid during normal operation is:
De-energized, open
In the Hydraulic Circuit 2 the TRSOV solenoid during shut-off operation is:
Energized, closed
When setting SOV 1 switch on the Hydraulic Control Panel to CLOSE, the pressure indicator 1 on MFD shows:
About 207 bar
In case of total loss of pressure on hydraulic system 2:
The cautions HYD UTIL PRESS and SERVO are lit on
Extend landing gear using EMER DOWN switch on Landing Gear Control Panel and land as soon as practicable
In case of HYD UTIL PRESS caution:
SOV 1 and SOV 2 switches on the Hydraulic Control Panel are ineffective
In case of 1 HYD OIL TEMP caution:
Lower landing gear and set SOV 1 switch on Hydraulic Control Panel to CLOSE
In case of 2 HYD OIL TEMP caution:
Lower landing gear, set SOV 2 switch on the Hydraulic Control Panel to CLOSE, land as soon as practicable
The SOV 1 switch on the Hydraulic Control Panel can be set to CLOSE if the following cautions are lit:
1 HYD OIL TEMP
When setting SOV switch on the Hydraulic Control Panel to CLOSE:
Utilities shut-off valve remains de-energized
SOV 1 switch on the Hydraulic Control Panel can be set to CLOSE only if:
TRSOV valve is open
When setting SOV 1 switch on the Hydraulic Control Panel to CLOSE, the following cautions are lit on:
1 SERVO, 1 HYD OIL PRESS
When setting SOV 2 switch on the Hydraulic Control Panel to CLOSE, the following cautions are lit on:
2 SERVO, 2 HYD OIL PRESS
In case of failure of pump 2 on Hydraulic System 2, the following cautions are lit on:
2 HYD PUMP
In case of failure of pump 1 on Hydraulic System 1, the following cautions are lit on:
1 HYD PUMP, 1 SERVO, 1 HYD OIL PRESS, EMERG LDG PRESS
The Hydraulic circuit 2 is losing oil. After some time you would expect to see:
The caution HYD UTIL PRESS and then the caution 2 SERVO
The Hydraulic circuit 1 is losing oil. After some time you would expect to see:
The caution EMER LDG PRESS together with the caution 1 HYD MIN
The Hydraulic circuit 2 is losing oil. After some time you would expect to see the following cautions:
HYD UTIL PRESS appears, then 2 SERVO appears and HYD UTIL PRESS disappears, then HYD UTIL PRESS appears together with 2 HYD MIN
If the SOV 1 switch on the Hydraulic Control Panel has been set to CLOSE and there is a subsequent droop of pressure on system 2.
The SOV switch is not automatically reset
If the SOV 1 switch on the Hydraulic Control Panel has been set to CLOSE and there is a subsequent drop of pressure on system 2:
The SOV switch is automatically reset
Pressure on system 1 is reinstated
In case of 2 HYD MIN caution:
Lower landing gear, land as soon as practicable
If the caution 1 HYD MIN is lit on you could set to CLOSE on the Hydraulic Control Panel:
The SOV 1 switch
If the caution 2 HYD MIN is lit on you could set to CLOSE on the Hydraulic Control Panel:
The SOV 2 switch
SERVO caution is provided when the servoactuator main spool valve is jammed in the center and:
Flight controls are operated
The microswitch on servoactuator is operated when:
A main spool valve is jammed together with a low pressure condition in the hydraulic circuit
In case of 2 SERVO caution:
Lower landing gear, land as soon as practicable
In case of 2 SERVO caution:
Control valve in a servoactuator is jammed or loss of pressure on the system
Tail Rotor Shut-Off Valve is closed or SOV 2 switch on the Hydraulic Control Panel is set to CLOSE
In case of 1 SERVO caution:
Control valve in a servoactuator is jammed or loss of pressure on the system
The 2 SERVO caution could be lit together with:
2 HYD MIN
The 1 SERVO caution could be lit together with:
EMER LDG PRESS in case of loss of pressure on the system
The SOV 2 CLOSE selection on the Hydraulic System Control Panel is:
Inhibited if the flight control actuators low pressure exists in the hydraulic system no. 1
The PRESS amber legend of the HYD 1 indicator on the Hydraulic System Control Panel is lit when:
The hydraulic pressure drops below a predetermined value together with the cautions 1 HYD PRESS, the SERVO and the EMERG L/G PRESS and 1 HYD PUMP
The Hydraulic circuit 1 is losing oil. After some time you would expect to see the following cautions:
EMER LDG PRESS appears together with 1 HYD MIN , then 1 SERVO appears
When setting SOV switch on the Hydraulic Control Panel to CLOSE:
Utilities shut-off valve remains open
The microswitch on servoactuators is operated when:
A main spool valve is jamed together with a low pressure condition in the hydraulic circuit
In case 2 SERVO caution:
Land as soon as practicable