Landing Gear

Question 1

How many degrees can the nose gear be controlled by either rudder or tiller?

Answer 1

Rudder: 7º either direction

Tiller: 70º either direction (overrides breaks)

   * Body Gear operate above 20º with airspeed below 15 knts
   * Body Gear deactivate and centered above 20 knts

Question 2

How many gear compose the landing gear systems

Answer 2

• nose wheel (steerable)
• Main Gear:
  
  • 2 Body Gear of 4 wheels each (steerable)
  • 2 Wing Gear of 4 wheels each (non-steerable)

Question 3

Air/Ground sensing system

Answer 3

• nose gear extension sensing (for stall warning and steering)
• main gear tilt sensors - tilted (air mode); not tilted (ground mode)

Question 4

When is the landing gear lever lock release?

Answer 4

• in flight; main gear tilted and body gear centered

- pushing and holding override switch

Question 5

How many landing gear doors?

Answer 5

Nose Gear:

• 2 x hydraulic doors
• 2 x mechanical door

Main Body Gear

• 1 x hydraulic door
• 2 x mechanical door

Main Wing Gear

• 1 x hydraulic door
• 1 x mechanical door

Question 6

What keeps the lading gear in the UP/Down positions?

Answer 6

Up:

• nose gear: mechanically locked
• main gear: unlocks

Down:
- all gear: down locks

Question 7

What happens if a gear is not up and locked after normal transit time?

Answer 7

• EICAS Gear indication changes to expanded non-normal format
• effected gear will show in transit or Down

Question 8

Landing Gear Alternate Extension

Answer 8

• activated by pushing Alternate Gear Extension switches
• gear up locks and door latches are electrically released
• gravity extends gear
• springs pull downlocks in to position

Question 9

Components of Brake System

Answer 9

• Normal Brakes
• Alternate brakes
• anti-skid protection
• auto brakes
• parking brake
• brake accumulator

Question 10

Alternate Brake systems

Answer 10

• HYD 1 supplies alternate brakes if HYD 4 pressure is low

- HYD 2 supples alternate brakes if HYD 4 and 1 pressure is low

Question 11

Brake Torque Limiter

Answer 11

• sensor detect excessive torque during breaking

- signal sent to antiskid valve to release brake pressure

Question 12

Auto-break arming:

Answer 12

• normal breaks functioning
• anti-skid functioning
• on the ground; RTO can only be selected
• in flight; five levels of deceleration

Question 13

When does RTO activate?

Answer 13

• RTO selected
• on the ground above 85 kts
• all thrust levers moved to idle

Question 14

When does autobreak activate?

Answer 14

• ground mode sense
• wheel spin up
• thrust levers idle

Question 15

How much pressure does the brake accumulator provide?

Answer 15

• pressurized by HYD 4
• enough pressure to set and hold parking brake
• not enough to stop aircraft

Question 16

Which hydraulic system should be pressurized first with parking brake set?

Answer 16

HYD 4 to prevent transfer of hydraulic fluid from HYD 1 or 2

Question 17

BRAKE SOURCE Light

Answer 17

Active brake hydraulic sources (hydraulic systems 4, 1, and 2) have low pressure

Question 18

Sequence of events during Landing Gear Retraction

Answer 18

• lever moved to UP positions
• landing gear doors open
• automatic braking occurs
• landing gear hydraulically retract
• after retraction indicator changes to UP for 10 secs and then blanks

Question 19

Brake Temp Amber

Answer 19

Relative value 5 or higher

Question 20

After Alternate Gear Extension after loss of HYD #4 what is the sequence of the gear doors?

Answer 20

• Gear doors remain open (no hydraulic pressure)
• After Landing Gear Lever is placed DN (via checklist):
  
  • nose gear doors close (on HYD #1)
  • main body gear doors close (on HYD #1)
  • wing gear doors remain open (on HYD #4)