Term
| Which components are only powered by HYD SYS 1? |
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Definition
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Term
| Which components are only powered by HYD SYS 2? |
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Definition
| Outboard brakes and main gear downlock assist actuators |
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Term
| Which components are only powered by HYD SYS 3? |
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Definition
| Main landing gear including nose door, nose wheel steering and inboard brakes |
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Term
| How is each B pump powered? 1A? 3A? 3B? 2B? |
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Definition
1A, 3A - AC BUS 2
3B, 2B - AC BUS 1 |
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Term
| Which pump is energized when the ADG is deployed? |
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Definition
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Term
| When do the 1B and 2B pumps operate automatically when in the AUTO position? |
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Definition
| Associated bus is powered Cross-side generator is operating Flaps > 4° |
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Term
| What pressure are the hydraulic accumulators precharged to? |
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Definition
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Term
| What are the average capacities of the hydraulic reservoirs? |
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Definition
System 1: 3 liters
System 2: 4 liters
System 3: 11 liters |
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Term
| When do the 1B and 2B pumps operate automatically when in the ON position? |
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Definition
Air: associated bus is powered, cross-side generator is operating
Ground: associated bus is powered |
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Term
| When does the 3B pump operate automatically when in the AUTO position? |
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Definition
| AC BUS 1 is powered Either engine driven generator is operating Flaps > 4° |
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Term
| What is the purpose of the priority valves? |
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Definition
| Cuts off hydraulic pressure to main and nose gear selector valves when HYD SYS 3 pressure falls below 2100 psi |
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Term
| "HYD PUMP/EDP" and "HYD LO PRESS" caution |
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Definition
| Motor pump or system pressure falls below 1800 psi |
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Term
| How are HYD SYS 1 and 2 shutoff valves closed? |
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Definition
| With the ENG FIRE PUSH switch |
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Term
| Explain "load shedding" with regard to the B pumps. |
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Definition
| Prevents an electrical overload condition during single-generator operation |
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Term
| Which hydraulic components are located in the right wheel well? |
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Definition
| System 3 accumulator, reservoir and ground service panel |
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Term
| What does a red EDP input line on the hydraulic EICAS synoptic page indicate? |
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Definition
| Hydraulic SOV did not close following an engine fire |
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Term
| Which hydraulic system powers the left aileron? |
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Definition
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