landing gear

What does the GEAR DISAGREE EICAS message mean?

A disagreement between the handle position and the actual gear position — GEAR DISAGREE — Gear position disagrees with Landing Gear lever position after normal transit time. [Ref: Chapter 14 — Landing Gear — 14.30.1]

In what cases will expanded gear position be displayed?

For GEAR DISAGREE and for inoperative gear position indication system [Ref: FCOM Chapter 14 — Landing Gear]

After gear retraction with the gear lever in OFF, the tilt position is…

The tilt position is maintained hydraulically (center/body) and mechanically (wing) [Ref: FCOM 14.20.1]

The automatic gear lever lock prevents landing gear retraction after liftoff until…

The gear is centered and tilted — In flight, the lever lock is released when the main gear are tilted and the body gear is centered. [Ref: Chapter 14 — Landing Gear — 14.20.1]

Which hydraulic systems are necessary for pushback?

Hydraulic systems 1 and 4 [Ref: FCOM Chapter 14 — Landing Gear]

How can you open the hydraulically operated gear doors?

With the ground door release handle; it bypasses hydraulics, releases door uplocks, and the door opens by free fall [Ref: FCOM Chapter 14 — Landing Gear]

During normal operation, which statement is correct regarding landing gear hydraulic supply?

Wing gear is supplied by hydraulic system 4; nose and body gear by hydraulic system 1 [Ref: FCOM 14.20.1]

Nose wheel and main body gear steering is powered by which hydraulic system?

Hydraulic system 1 — Nose wheel and body gear steering is powered by hydraulic system 1. [Ref: Chapter 14 — Landing Gear — 14.20.3]

Is tilt guaranteed after emergency gear extension?

No [Ref: FCOM 14.20.1]

The alternate brake system is powered by…

Hydraulic system 1, with hydraulic system 2 as backup — The alternate brake system is powered by hydraulic system 1 or 2. [Ref: Chapter 14 — Landing Gear — 14.20.1]

The normal hydraulic brake system is powered by…

Hydraulic system 4 — The normal brake system is powered by hydraulic system 4. [Ref: Chapter 14 — Landing Gear — 14.20.1]

The brake temperature amber/high range is…

5 or higher — amber - high range; 5 or higher [Ref: Chapter 14 — Landing Gear — 14.10.8]

The brake temperature white/normal range is…

0 to 4 — white - normal range; 0 to 4 [Ref: Chapter 14 — Landing Gear — 14.10.8]

What color does the gear position indicator show before blanking when all gear are up and locked?

White; it blanks after 10 seconds [Ref: FCOM Chapter 14 — Landing Gear]

RTO will become active above…

85 knots groundspeed — The RTO autobrake setting commands maximum braking pressure if: • the airplane is on the ground • groundspeed is above 85 knots, and • all thrust levers are closed [Ref: Chapter 14 — Landing Gear — 14.20.5]

The brake accumulator is normally pressurized by hydraulic system 4. True or False?

True [Ref: FCOM 14.30.1]

Full rudder pedal deflection will turn the nose wheel up to…

7 degrees in either direction — The rudder pedals can be used to turn the nose wheels up to 7 degrees in either direction. [Ref: Chapter 14 — Landing Gear — 14.20.3]

Upon gear retraction, the main gear is held up and locked with trapped hydraulic pressure when the gear handle is selected OFF. True or False?

False [Ref: FCOM 14.20.1]

When will BODY GEAR STRG EICAS message display?

When any body gear is not centered when it should be — The FCOM describes the triggering logic as “>BODY GEAR STRG Advisory Body gear steering unlocked when commanded locked, or pressurized when not commanded.” Those are the conditions that lead to When any body gear is not centered when it should be. [Ref: FCOM 14.30.1]

With full rudder deflection, will the body gear steering move?

No; rudder maximum is 7°, body gear steering needs 20° [Ref: FCOM Chapter 14 — Landing Gear]

Can the body gear steering move with full rudder deflection?

No; rudder maximum is 7°, body gear steering needs 20° [Ref: FCOM Chapter 14 — Landing Gear]

With the alternate brake system pressurized, the parking brake works on pairs of wheels. True or False?

False [Ref: FCOM 14.30.1]

If the BRAKE SOURCE light is illuminated, what does it mean?

All braking source is lost [Ref: FCOM Chapter 14 — Landing Gear]

If the antiskid system is lost, what other system will you lose?

Autobrake [Ref: FCOM Chapter 14 — Landing Gear]

How will the braking system remain pressurized if you lose hydraulic system 4?

Automatically — If hydraulic system 4 pressure is low, hydraulic system 1 supplies pressure to the alternate brake hydraulic system. If hydraulic pressure in systems 4 and 1 are low, system 2 powers the alternate brake system. [Ref: Chapter 14 — Landing Gear — 14.20.4]

After an emergency gear extension, will the gear doors remain open, and will you get an EICAS message about it?

Yes, the doors remain open; no EICAS message — Gear doors may remain open for the affected gear after alternate extension. Final configuration is dependent on the malfunction. [Ref: Chapter 14 — Landing Gear — 14.20.3]

If the brake accumulator displays 800 psi, will you have normal braking?

No [Ref: FCOM Chapter 14 — Landing Gear]

After alternate gear extension, what system will not be available?

Autobrake [Ref: FCOM 14.20.1]

The alternate gear extension…

Electrically releases the door uplocks [Ref: FCOM Chapter 14 — Landing Gear]

The ANTISKID message indicates…

A fault detected in the antiskid system (loss of protection) [Ref: FCOM 14.30.1]

If the antiskid system is lost…

ANTISKID displays adjacent to affected wheels; longer landing distance; braking/autobrake effectiveness reduced; risk of tire blowout/locked tire [Ref: FCOM Chapter 14 — Landing Gear]

When is the EICAS message BRAKE TEMP displayed?

At 5 or higher — The FCOM describes the triggering logic as “File Highlight EICAS Alert Messages Note: Configuration (CONFIG) warning messages are described in Chapter 15, Section 30, “EICAS Messages.” Message.” Those are the conditions that lead to At 5 or higher. [Ref: FCOM 14.30.1]

What causes the gear to extend when the alternate gear extension switches are used?

Gravity, free fall and spring locks — The gear uplocks and gear door latches are electrically released, allowing the gear to free fall. Gravity and airloads extend the gear and springs pull the downlocks into the locked position. [Ref: Chapter 14 — Landing Gear — 14.20.3]

The parking brake accumulator stores enough pressure to set the parking brake but is not designed to stop the airplane. True or False?

True [Ref: FCOM Chapter 14 — Landing Gear]

The ANTISKID message indicates the loss of…

Antiskid for one wheel or more [Ref: FCOM 14.30.1]

What causes the gear to extend when the alternate gear extension switches are used?

Gravity / free fall — The FCOM describes the triggering logic as “Hydraulic power for nose and body gear retraction, extension, and steering is supplied by hydraulic system 1.” Those are the conditions that lead to Gravity / free fall. [Ref: FCOM Chapter 14 — Landing Gear]

Reverse thrust after landing influences the brake pressure provided by the autobrake system. True or False?

True — To maintain the selected airplane deceleration rate, autobrake pressure is reduced as other controls, such as thrust reversers and spoilers, contribute to total deceleration. [Ref: Chapter 14 — Landing Gear — 14.20.5]

The RTO mode is activated by…

Airplane on the ground, groundspeed above 85 knots, and all thrust levers closed (idle) — The RTO autobrake setting commands maximum braking pressure if: • the airplane is on the ground • groundspeed is above 85 knots, and • all thrust levers are closed [Ref: Chapter 14 — Landing Gear — 14.20.5]

If the normal brake accumulator pressure indication shows zero, which statement is correct?

The parking brake can be set with either the normal or alternate braking system pressurized [Ref: FCOM 14.10.1]

When will the AUTOBRAKE disengage after landing?

Manual braking, thrust advanced, or disarming the autobrake system — The system disarms immediately if any of the following occur: • pedal braking applied • any Thrust lever advanced after landing • Speedbrake lever moved to DOWN detent … • DISARM or OFF position selected … • autobrake fault [Ref: Chapter 14 — Landing Gear — 14.20.5]

Parking brake can only be set with hydraulic system 4 pressurized. True or False?

False [Ref: FCOM 14.30.1]

The antiskid system with normal or alternate braking always protects each main wheel individually. True or False?

False — The normal brake hydraulic system provides each main gear wheel with individual antiskid protection. The alternate brake hydraulic system provides antiskid protection to lateral wheel pairs … rather than to individual wheels. [Ref: Chapter 14 — Landing Gear — 14.20.4]

After takeoff, how is the autobrake selector positioned to OFF?

Automatically [Ref: FCOM Chapter 14 — Landing Gear]

Select the correct statement about nose wheel steering.

Nose wheel steering is powered by hydraulic system 1 [Ref: FCOM 14.20.1]

To what speed will the autobrake system provide automatic braking?

To a complete stop — The system provides braking to a complete stop or until it is disarmed. [Ref: Chapter 14 — Landing Gear — 14.20.5]

What disarms the autobrakes after landing?

DISARM/OFF selected; pedal braking; any thrust lever advanced; speedbrake lever moved to DN after deployment; autobrake fault; normal antiskid fault; loss of normal brake hydraulic pressure [Ref: FCOM 14.30.1]

How long is the gear UP indication displayed on EICAS after all gears are up and locked?

10 seconds — The EICAS landing gear position indication changes to UP for 10 seconds and then blanks. [Ref: Chapter 14 — Landing Gear — 14.20.2]

What holds the main landing gear in the retracted position with the gear lever OFF?

Uplocks — After retraction, the main gear are held in the up position by uplocks. [Ref: Chapter 14 — Landing Gear — 14.20.2]

What happens when tiller and rudder pedals are operated simultaneously on the ground?

Tiller inputs override rudder pedal inputs — Tiller inputs override rudder pedal inputs. [Ref: Chapter 14 — Landing Gear — 14.20.3]

When is the EICAS message CONFIG PARKING BRK displayed?

Parking brake set on ground, airspeed below V1, three or more fuel control switches in RUN, and engine 2 or 3 thrust in takeoff range — The FCOM describes the triggering logic as “File Highlight EICAS Alert Messages Note: Configuration (CONFIG) warning messages are described in Chapter 15, Section 30, “EICAS Messages.” Message.” Those are the conditions that lead to Parking brake set on ground, airspeed below V1, three or more fuel control switches in RUN, and engine 2 or 3 thrust in takeoff range. [Ref: FCOM Chapter 14 — Landing Gear]

When does the EICAS message ANTISKID OFF display?

Antiskid power off on all wheels, or parking brake lever released and parking brake valve not fully open, or brake system control unit power loss — ANTISKID OFF — Antiskid power off on all wheels, or parking brake lever released and parking brake valve not fully open, or brake system control unit power loss occurs. [Ref: Chapter 14 — Landing Gear — 14.30.1]

After takeoff, how is the autobrakes selector positioned to OFF?

Automatically [Ref: FCOM Chapter 14 — Landing Gear]

When is the EICAS message BRAKE TEMP displayed?

One or more brakes equal to or greater than 5 units — BRAKE TEMP — Temperature of one or more brakes excessive. Brake temperature equal to or greater than 5 units. [Ref: Chapter 14 — Landing Gear — 14.30.1]

When the autobrake system is armed during landing, when are the brakes applied after touchdown?

All thrust levers closed, ground mode sensed, and wheels spun up — After landing, autobrake application begins when: • all thrust levers are closed, • ground mode is sensed, and • the wheels have spun up [Ref: Chapter 14 — Landing Gear — 14.20.5]

The accumulator stores enough pressure to set the parking brake but is not designed to stop the airplane. True or False?

True [Ref: FCOM Chapter 14 — Landing Gear]

When is body gear steering activated?

Nose wheel angle more than 20° and speed below 15 knots; deactivated and centered above 20 knots — Body gear steering operates when the nose wheel steering angle exceeds 20 degrees. … Body gear steering is activated when ground speed decreases through 15 knots. [Ref: Chapter 14 — Landing Gear — 14.20.3]