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737-800 Systems > Hydraulics > Flashcards

Hydraulics Flashcards

(55 cards)

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1
Q

Amber Electric Hydraulic Pump OVERHEAT Lights

A

Hydraulic Fluid used to cool and lubricate electric motor driven pump has overheated
OR
Pump itself has overheated

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2
Q

Amber Hydraulic pump LOW PRESSURE lights

A

Output pressure LOW
Note: When Fire switch pulled, LOW PRESSURE light DEACTIVATED

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3
Q

Explain ON and OFF position Electric Hydraulic Pump Swicthes

A

ON - powers associated electric driven pump
Off - electric power removed from pump

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4
Q

Explain ON and OFF position for
ENGINE Hydraulic Pump Switches

A

ON - DEENERGISE Blocking valve in pump to allow pump pressure to enter

OFF - ENERGISES blocking Valve to block pump flow output

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5
Q

Why should ENGINE hydraulic pumps remain ON at shutdown?

A

To prolong solenoid life

As ON position DEENERGISES blocking Valve

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6
Q

How is Hydraulic Quantity displayed?

A

Via MFD SYS in Lower DU

Indicates digital percentage (0-106%)

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7
Q

Where else can hydraulic quantity displayed?

A

Displayed at each reservoir in the main wheel well

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8
Q

How is Hydraulic Pressure indicated and what is it’s Normal and Maximum pressure?

A

Via MFD SYS

Normal pressure - 3000 PSI
Max pressure - 3500 PSI

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9
Q

What hydraulic pressure is indicated when both ENG and ELEC hydraulic pumps for the same system is OFF?

A

May Indicate hydraulic RESERVOIR pressure

Normally LESS THAN 100 PSI

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10
Q

What does RF (white) indication mean?

A

Hydraulic quantity BELOW 76%

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11
Q

When is RF (white) indication valid?

A
  1. On the ground + both engine shutdown
  2. After Landing with flaps up during taxi-in
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12
Q

What happens when FLIGHT CONTROL Switches to STDY RUD?

A

Activates Standby pump

Opens standby rudder shutoff valve to pressurise standby rudder power control unit

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13
Q

What happens when FLIGHT CONTROL Switches to OFF?

A

Closes flight control shutoff valve isolating,
1. Ailerons
2. Elevators
3. Rudder
From associates Hydraulic system pressure

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14
Q

Why is FLIGHT CONTROL Switches positioned ON?

A

Guarded position - normal operating position

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15
Q

What does Flight Control LOW PRESSURE lights indicate?

A

Indicates low hydraulic system (A or B) pressure to ailerons, elevators and rudder

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16
Q

When is Flight Control LOW PRESSURE lights DEACTIVATED?

A

When FLIGHT CONTROL switch positioned to STBY RUD

AND

Standby rudder shutoff valve opens

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17
Q

What does STANDBY HYDRAULIC LOW QUANTITY light indicate?

A

Low quantity in standby hydraulic reservoir

Always armed

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18
Q

What does STANDBY HYDRAULIC LOW PRESSURE light indicate?

A

Standby pump output pressure is LOW

Armed only when standby pump operation selected

OR

Automatic standby function activated

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19
Q

Explain ALTERNATE FLAPS master switch positions

A

OFF (guarded position) - normal operating position

ARM - closes TE flap bypass valve, activates standby pump, arms ALTERNATE FLAPS position switch

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20
Q

What does STBY RUD ON light indicate?

A

Standby Hydraulic system is commanded to pressurise standby power control unit

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21
Q

How many hydraulic system does B737-800 have?

A

System A, B and Standby

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22
Q

Can System A/B power all flight control with no decrease in airplane controllability?

A

TRUE

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23
Q

Where is each hydraulic reservoir located?

Study These Flashcards
A

Main wheel well area

24
Q

How are System A and B pressurised?

25
What is the Purpose pressurisation at the reservoirs?
Ensure positive fluid flow to all pumps
26
Systems pressured by A Hydraulics?
Ailerons - rudder - elevators Flight spoilers (2,4,9,11) Ground Spoilers ( 1,6,7,12) Alternate brakes No. 1 Reversers Autopilot A Normal steering Landing gear Power transfer unit
27
Systems pressured by system B?
Ailerons - rudder - elevators Flight spoilers (3,5,8,10) LE Flap and Slats TE Flaps Normal brakes No.2 reverser Autopilot B Alternate steering Landing gear transfer valve Autoslats Yaw damper
28
Advantage Engine Driven pump Vs Electric Driven Pump?
Engine pump Supplies 6 times fluid volume of electric pump
29
What happens when ENG driven hydraulic pump OFF?
Energises blocking valve to block pump output However, Pump continues to rotate
30
What happens when pulling engine fire switch for related system?
Engine drive Hydraulic LOW PRESSURE light deactivated Fluid flow to pump shuts off
31
What does ELEC hydraulic pump control?
Controls related Electric Motor pump
32
What happens if Loss of an engine drive pump?
High demand on electric pumps Resulting in intermittent LOW PRESSURE for remaining electric pump Flight control LOW PRESSURE light MASTER CAUTION FLT CONT & HYD annunciator
33
Other purpose of hydraulic fluid?
Cooling and lubrication of pumps
34
What happens to hydraulic fluid before returning to reservoir?
Passes through heat exchanger
35
Where are Heat exchangers located?
System A: Main fuel tank No.1 System B: Main fuel tank No.2
36
Minimum fuel for ground operation of ELECTRIC PUMPS?
760kg In related MAIN TANKS
37
What happens if leak develops in ENGINE pump Line for system A?
STANDPIPE in reservoir prevents total fluid loss System A pressure is maintained by A ELECTRIC pump
38
What happens if leak develops in ELEC pump Line for system A?
Quantity is system A reservoir steadily decreases to ZERO All system pressure lost
39
What happens if leak develops in either pump Line for system B?
Quantity indicates ZERO System B pressure is LOST
40
Does System B leak affect Standby hydraulic Operation?
NO
41
Purpose of Power Transfer Unit (PTU)?
Supply Additional hydraulic fluid to operate autoslats, LE flaps and slats when system B ENG pump is inoperative
42
How does PTU operate?
Uses SYSTEM A pressure to power hydraulic pump that pressurises system B hydraulic fluid
43
PTU Automatic Operation criteria?
PTU operates automatically when; - SYSTEM B ENG pump pressure drops below limits - Airborne - flaps not less than 15 but not up
44
Purpose of Landing Gear Transfer Valve?
Supply hydraulic fluid to RAISE landing gear when SYSTEM A ENG pump is lost
45
How does Landing Gear Transfer Valve Operate?
System B ENG pump supplies hydraulic fluid to transfer valve to raise gear
46
When does Landing Gear Transfer Valve Operate?
Airborne No.1 Engine RPM drops below Limit (system A) Landing gear lever UP Either main gear not up and locked
47
How can Standby Hydraulic be Activated?
Manual or Automatic
48
How many Pumps does the standby hydraulic system contain?
A Single ELECTRIC MOTOR PUMP
49
What does Standby Hydraulic Pump power/ supply?
Thrust Reversers Rudder LE Flaps and Slats (extend only) Standby yaw damper
50
Manual Operation of Standby Hydraulic system?
Position EITHER FLT CONTROL switch to STBY RUD
51
What is affected during Manual Operation of Standby Hydraulic System?
Standby ELEC pump activated Standby rudder shutoff valve opened Standby system to power rudder and thrust reverser Illuminates STBY RUD ON, MASTER CAUTION, FLT CONT annunciator ——————- Shuts off flight control shutoff valve Deactivates flight control LOW PRESSURE light
52
How is Automatic Operation of Standby Hydraulic system initiated?
When Loss of either A/B systems and, Flaps extended and, Wheel speed > 60kts or airborne and, FLT CONTROL switch ON (guarded)
53
What is affected during Automatic Operation of Standby Hydraulic System?
Standby ELEC pump activated Standby rudder shutoff valve opened Standby system to power rudder and thrust reverser Illuminates STBY RUD ON, MASTER CAUTION, FLT CONT annunciator
54
What is the Difference between Automatic and Manual Operation of Standby Hydraulic system?
During Automatic Operation, Flight control shutoff valve for ailerons elevators and rudder is NOT SHUTOFF FLT CONTROL LOW PRESSURE lights remain illuminated ——— Only when STBY RUD is position - above statement is changed
55
What happens when ALTERNATE FLAPS master switch is positioned ARMED?
Activated standby electric pump Closes TE flaps bypass valve Arms ALTERNATE FLAPS position switch Allows standby system to power LE Flaps, slats and reversers

737-800 Systems (2 decks)

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