Term
| What is the power source for each hydraulic pump? |
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Definition
1 and 4 are air driven pumps
2 and 3 are electric pumps |
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Term
| What does the hydraulic SYS FAULT fault light indicate? |
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Definition
Low system pressure
Low reservoir quantity
Excessive fluid temperature |
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Term
| What does an ENGINE hydraulic pump low PRESS light indicate? |
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Definition
| Low engine hydraulic pump pressure |
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Term
| When will the demand pumps be commanded to operate if the hydraulic demand pump selector is in the AUTO position? |
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Definition
Fuel control switch is in CUTOFF
Engine pump output pressure is low
1 and 4 also operate when:
-Flaps in transit
-Flaps out of up in flight |
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Term
| What does a hydraulic demand pump low PRESS light indicate? |
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Definition
Selector position OFF or AUX
Demand pump operates and output pressure is low
Demand pump fails to operate |
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Term
| What is the purpose of the auxiliary pump? |
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Definition
| Used for ground handling operations |
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Term
| How is the system 4 Aux pump powered? |
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Definition
| AC power through the Ground Handling Bus |
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Term
| What do you monitor when placing the #4 Demand pump to AUX? |
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Definition
Verify SYS FAULT light extinguished
PRESS light remains illuminated
BRAKE SOURCE light extinguished
Brake accumulator pressure in green band |
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Term
| Why is HYD PRESS DEM 4 displayed during engine start? |
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Definition
| Demand pump selector in AUX and engine pump is pressurized |
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Term
| Why are the hydraulic reservoirs pressurized by the bleed air system? |
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Definition
Prevent pump cavitation
Ensure positive flow during high demand conditions |
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Term
| What does a hydraulic reservoir quantity indication of .80 mean, on the secondary EICAS mean? |
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Definition
| 80% of normal service level 1.0 is full (100%) |
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Term
| What does a magenta RF displayed next to a hydraulic quantity indicator on the secondary EICAS mean? |
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Definition
| The reservoir requires refill (displays on ground only) |
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Term
| What are the indications of a HYQUIM (Hydraulic Quantity Interface Module) failure? |
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Definition
Intermittent or fluctuating:
SYS FAULT lights
HYD QTY LOW X advisory messages
EICAS quantity indications |
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Term
| How does pulling a fire switch affect the hydraulic system? |
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Definition
Closes hydraulic fluid SOV
Depressurizes EDP
Energizes demand pump |
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Term
| What are some examples of major system components powered by System 1? |
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Definition
Steering
Body gear
Alternate brakes
Inboard trailing edge flaps
Primary flight controls
Autopilot |
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Term
| What are some examples of major system components powered by System 2? |
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Definition
Alternate brakes
Primary flight controls
Spoilers
Stabilizer trim
Elevator feel
Lower yaw damper
Autopilot |
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Term
| What are some examples of major system components powered by System 3? |
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Definition
Primary flight controls
Spoilers
Stabilizer trim
Elevator feel
Upper yaw damper
Autopilot |
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Term
| What are some examples of major system components powered by System 4? |
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Definition
Wing gear
Normal brakes
Outboard trailing edge flaps
Primary flight controls
Inboard spoilers |
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Term
| Which hydraulic systems operate the autopilot? |
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Definition
| L,C,R autopilot servos are powered by systems 3,1,2 respectively |
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Term
| With a loss of HYD SYS 4, how are the flaps and gear lowered? |
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Definition
Flaps: secondary mode
Gear: alternate gear extension |
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