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NEW Alaska B737 Systems > Hydraulics > Flashcards

Hydraulics Flashcards

1
Q

How many hydraulic systems are there? What are they?

A

3 hydraulic systems

A, B, and Standby

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2
Q

What is the normal hydraulic pressure range?

A

3000 PSI +/- 200 PSI

3500 PSI maximum

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3
Q

What is the purpose of the PTU? When does it operate? Any flight deck indications?

A

Allows HYD SYS A power for SYS B fluid

Autoslats and LEDs move at normal rate if
-Airborne,
-Flaps extended,
-Sys B engine pump output pressure low (<2350psi)

No flight deck indications of PTU operation

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4
Q

What components are on Hydraulic System A?

A

Flight Controls
Autopilot A
Landing Gear (and tail-skid)
Normal Nose Wheel Steering
Alternate Brakes
Thrust Reverser #1
PTU

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5
Q

What components are on Hydraulic System B?

A

Flight Controls
Autopilot B
Flaps and Slats
Normal Brakes (and auto brakes and brake accumulator)
Alternate Nose Wheel Steering
Yaw Damper
Thrust Reverser #2
Landing Gear Transfer Unit

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6
Q

What components are on the Standby Hydraulic System?

A

Rudder
Standby Yaw Damper
Thrust Reversers
LE Flaps/Slats

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7
Q

What does positioning a FLT CONTROL switch to STBY RUD do? What is the light logic?

A

Activates Standby Hydraulic System
-Standby hydraulic pump activated
-Respective A/B flight control shutoff valve closes
-Standby rudder shutoff valve opens

Light Logic
-Standby HYD LOW PRESSURE (amber) light armed
-Respective FLT CTRL LOW PRESSURE (amber) light inhibited
-STBY RUD (amber) on
-Master Caution and FLT CONT (amber)

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8
Q

What would cause the automatic operation of the Standby Hydraulic System?

A

Force Fight Monitor (FFM), or

Loss of hydraulic system with flaps extended
-Airborne or wheel speed > 60 knots
-Flaps extended
-Loss of HYD SYS A or B pressure
-Respective FLT CONTROL A/B switch ON (normal/guarded position)

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9
Q

During normal operations, what could cause variations in hydraulic quantity indications?

A

Load on system, such as
-Landing gear retraction (up to 20% drop in A)
-LED extension (up to 20% drop in B)

Cold temperature soaking (up to 20% drop)

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10
Q

What would indicate a hydraulic system requires a refill?

A

Hydraulic quantity below 76%, white RF by quantity indicator

Displayed on the ground with engines shutdown, or

After landing with flaps up

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11
Q

What pressurizes the Hydraulic System Reservoirs?

A

Regulated bleed air prevents fluid foaming and ensures pump fluid supply

A reservoir – left bleed duct
B reservoir – right bleed duct
STBY reservoir – from B reservoir

45-50 PSI (mark on gauge) pressure relief at 60 PSI

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12
Q

Which hydraulic reservoirs have a standpipe?

A

System A reservoir
-20% quantity protected for leak in #1 engine hydraulic pump
–Saves fluid for electric pump

System B reservoir
-Leak in either engine or electric pump, quantity indicates 0%
–Enough fluid remains for PTU operation
-Leak in standby system drains SYS B reservoir to ~70%

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13
Q

With zero quantity indicated for System B, can the PTU still operate?

A

Yes (unless leak in PTU?)

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14
Q

When is the Standby HYD LOW QUANTITY (amber) light armed? When would it illuminate?

A

Low quantity light always armed

Illuminates when Standby Hydraulic reservoir < 50%

Leak in standby hydraulics drains B reservoir to ~70%

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15
Q

What does a LOW PRESSURE (amber) light indicate?

A

ENG/ELEC HYD PUMPS LOW PRESSURE
-Low pump output pressure

STANDBY HYD LOW PRESSURE
-Low output pressure of electric standby hydraulic pump
-Armed when standby pump activated

FLT CONTROL A/B LOW PRESSURE
-Respective hydraulic system pressure low

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16
Q

What does an OVERHEAT (amber) light indicate?

A

Overheat in respective electric hydraulic pump

(Or PTU for ELEC B OVERHEAT)

17
Q

Does the System A reservoir protect against a leak in both pumps? System B reservoir?

A

System A Reservoir Standpipe
-Leak in ENGINE pump – 20% quantity left for electric pump
-Leak in electric pump – 0% quantity, system A lost

System B Reservoir Standpipe
-Leak in EITHER engine or electric pump - 0% quantity indicated
-Fluid remains for PTU (autoslats/LEDs)

18
Q

What indications are there with a Standby Hydraulic leak? Does it affect other systems?

A

Standby HYD LOW QUANTITY (amber light) if quantity < 50%

System B reservoir drains to ~70% but continues to operate normally

19
Q

How should the ELEC hydraulic pump switches be turned ON/OFF?

A

Not simultaneously! Could trip C/Bs in E/E bay

B on then A on

A off then B off

20
Q

What is the landing gear transfer unit?

A

Allows HYD SYS B to retract landing gear if

-Airborne
-Engine 1 N2 < 50%
-Landing gear selected UP and gear not up

21
Q

How are the electric hydraulic pumps cooled? Limitations?

A

Heat exchanger in respective main fuel tank

1,675lbs of fuel in respective main tank for ground operation of electric hydraulic pump

NEW Alaska B737 Systems (16 decks)

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