Term
| How does the airplane distinguish between air mode and ground mode? |
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Definition
| Gear tilt and nose strut sensors (primary and backup) |
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Term
| Nose gear extension sensing provides a signal to relays controlling functions in which systems? |
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Definition
Stall warning
Nose gear steering |
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Term
| How are the landing gear held in position after retraction? |
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Definition
Main gear are held in the up position by uplocks
The nose gear is mechanically locked in the up position |
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Term
| During landing gear extension or retraction, state what happens if any gear position disagrees with lever position after normal transit time. |
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Definition
The EICAS changes to the expanded format
Affected gear displayed in transit or UP if the gear never unlocked from the up position |
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Term
| Describe the OFF position of the landing gear. |
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Definition
| Landing gear hydraulic system is depressurized |
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Term
| What conditions must be satisfied in order for the landing gear lever lock to release? |
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Definition
Main gear are tilted
Body gear centered |
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Term
| How does the gear extend through the alternate gear extension system? |
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Definition
By pushing the alternate gear extend switches
Uplocks and gear door latches are electrically released
Gear free‐falls
Gravity and air loads extend the gear
Springs pull the downlocks into the locked position |
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Term
| When does body gear steering operate? |
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Definition
When the nose wheel steering angle exceeds 20°
Ground speed decreasing through 15 knots |
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Term
| When is body gear steering deactivated? |
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Definition
| Ground speed increasing through 20 knots |
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Term
| How many degrees can the nose wheel steering system turn the nose gear with the tiller? Rudder pedals? |
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Definition
70° with the tiller
7° with the rudder pedals |
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Term
| Describe the difference between normal and alternate anti-skid braking systems |
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Definition
Normal - individual antiskid protection
Alternate - lateral wheel pairs |
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Term
| What provides automatic brake source selection? |
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Definition
| Pressure-operated selector valves |
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Term
| How does the brake torque limiter function in the alternate brake system? |
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Definition
Brake torque is sensed on an individual wheel basis
Brake pressure is released on a laterally paired wheel basis |
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Term
| What does the BRAKE SOURCE amber light indicate when illuminated? |
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Definition
| Brake hydraulic sources (systems 4, 1, and 2) have low pressure |
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Term
| Why is it necessary to pressurize hydraulic system 4 before pressurizing the other systems? |
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Definition
| Precludes the transfer of hydraulic fluid from system 1 or 2 into system 4, when the parking brake is set, and then released |
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Term
| What is the purpose of the brake accumulator? |
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Definition
| Provides parking brake application |
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Term
| What hydraulic system pressurizes the brake accumulator? |
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Definition
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Term
| Can the airplane be stopped with normal accumulator pressure? |
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Definition
| No, the accumulator is not designed to stop the aircraft |
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Term
| When do the auto brakes apply after landing? |
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Definition
All thrust levers are closed
Ground mode sensed
The wheels have spun up |
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Term
| Can autobrakes be selected when HYD SYS 1 is the active brake source? |
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Definition
| No, the system operates when the normal brake system is operating |
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Term
| What disarms the autobrakes after landing? |
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Definition
Pedal braking applied
Any thrust lever advanced
Speedbrake lever moved to DOWN
DISARM or OFF selected
Autobrake fault
Normal antiskid system fault |
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Term
| When does RTO apply maximum brake pressure? |
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Definition
Airplane on the ground
All 4 thrust levers are retarded to idle
Above 85 knots |
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Term
| What does a white, crosshatched, expanded gear position indication mean? |
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Definition
| Related landing gear in transit |
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Term
| What does an amber X display on an expanded gear position mean? |
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Definition
| Landing gear position indicator inoperative |
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Term
| What does a white empty box on the gear synoptic display indicate? |
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Definition
| Related landing gear door position indicators inoperative |
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Term
| What value on the brake temperature monitoring system causes the BRAKE TEMP Advisory EICAS message to appear? |
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Definition
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