Landing Gear/Brakes

Question 1

Gear Position Disagree light (amber)

Answer 1

Gear position disagrees with the lever position

Question 2

Landing Gear Lever positions

Answer 2

UP - pressurizes UP hydraulic lines
DN - pressurized Down hydraulic lines
OFF - removes hydraulic press from system

Question 3

Nose gear deflection by rudder and steering tiller

Answer 3

Rudder - 7º

Nose Wheel Steering tiller - up to 65º

Question 4

AUTOBRAKES Light (amber)

Answer 4

Autobrakes are disarmed or inoperative

Question 5

Autoborake RTO

Answer 5

automatically applies maximum braking pressure

• above 85 knts groundspeed
• thrust levers idle

Question 6

Brake Source Light

Answer 6

Both normal and alternate brake system pressure is low

Question 7

Reserve Brake Switch ON

Answer 7

• Allows use of reserve right hydraulic fluid
• Activates right electric hydraulic pump
• Isolates the right electric hydraulic pump power to the normal brake system

Question 8

Hydraulic power source for brakes

Answer 8

Normal and Reserve Brakes - Right hydraulic system (757)
Alternate brakes - left hydraulic system (757)

Normal Brake - Right hydraulic (767)
Alternate and Reserve Brakes - Center hydraulic (767)

Question 9

How does air/ground sensing system receive air/ground logic signals

Answer 9

Tilt sensor on each main gear
- configure aircraft systems to appropriate air/ground status

Nose gear strut compression sensors
- for stall warning and portions for caution and warning system

Question 10

Landing Lever Lock

Answer 10

• automatically locks landing gear lever on the ground-
• controlled by main gear tilt sensors
• manual override switch

Question 11

Landing Gear Normal Retraction

Answer 11

• both main gear tilt after takeoff releasing lever lock
• lever in Up position pressurized lines and starts retraction
• Gear and Door lights illuminate showing gear in transit (gear, door, and lever position disagree)
• Gear doors open and landing gear retracted into position
• gear and doors held up by up locks (757); rest on gear doors (767)

Question 12

Alternate Gear Extention (757)

Answer 12

• Alt Gear extend switch selected ON
• battery bus powers a DC electric pump
• trapped fluid in the supply line release all gear doors and uplocks
• gear free-fall to down and locked position
• Gear doors remain open (GEAR DOORS light displays)

Question 13

Components of Brake System

Answer 13

• Normal/reserve brake hydraulic system
• Alternate brake hydraulic system
• Brake accumulator
• Anti-skid protection
• Autobrake system
• Parking brake

Question 14

When does Alternate Braking become active?

Answer 14

• selection of alternate braking is automatic
• powered by left hydraulic system
• if right hydraulic pressure becomes low

Question 15

Back up braking if Normal/Reserve and Alt braking are lost

Answer 15

braking supplied by accumulator

- can provide several brake applications and parking brake application

Question 16

Anti-Skid Protection system

Answer 16

Provides Anti-skid, locked wheel, touchdown, and hydroplaning protection

• anti-skid valves reduce brake pressure
• normal/reserve brakes provide anti-skid to each main gear wheel
• alt braking provides anti-skit to laterally paired wheels

Question 17

When are autobrakes automatically supplied?

Answer 17

• one of fives levels of deceleration selected (1, 2, 3, 4, MAX AUTO)
• aircraft on the ground with wheel spin up
• thrust levers idle
• selected deceleration level occurs when pitch angel is less than 1º

Question 18

When will Autobrake automatically disarm

Answer 18

• brake pedal application
• either thrust lever advanced after landing
• speed break lever to full up after being deployed
• DISARM or OFF selected
• autobrake fault
• Normal anti-skid faul

Question 19

Landing Gear and Brake hydraulic source (767)

Answer 19

Landing Gear and Steering - Center Hydraulic system
Normal Brakes - right hydraulic system
Alternate Brakes - Center Hydraulic system

Question 20

Reserve Brake and Steering Switch (767)

Answer 20

Selected ON:

− Turns on center hydraulic system #1 electric pump regardless of switch position – and –
− Provides pressure to alternate brake system – and –
− Provides pressure to nosewheel steering system
− Isolates Center Hydraulic system fluid

Question 21

When are brake temperature readings accurate (767)

Answer 21

10-15 mins

Question 22

Tailskid system (767)

Answer 22

• extends for takeoff and landing

- helps protect the pressurized part of the aircraft from contract with the ground

Question 23

Alternate Gear Extension (767)

Answer 23

− Alternate gear extension uses battery bus to power an electric motor that uses a cable to
release the nosegear uplocks and main gear door locks

Question 24

Normal gear extension airspeed limit

Answer 24

270 kts/0.82M

Question 25

Alternate gear extension airspeed limit

Answer 25

250 knts/0.75M

Question 26

Reserve Brakes and Steering system (767)

Answer 26

Inflight, if center hydraulic system quantity sensed low, system automatically:

− Closes Isolation valve
♦ Shuts off center hydraulic system pressure from all components except: 
◊ Reserve brakes – and – 
◊ Nosewheel steering
− Opens Supply valve 
♦ Supplies center system standpipe protected fluid to: 
◊ Reserve brakes – and – 
◊ Nosewheel steering