B737 Landing Gear (Old)

Front 1

Which hydraulic system powers landing gear and nose wheel steering?

Back 1

Hydraulic system A

Front 2

Which hydraulic system powers normal brakes?

Back 2

Hydraulic system B

Front 3

What prevents the landing gear lever from moving to the UP position on the ground?

Back 3

A landing gear lever lock. An override trigger in the lever may be used to bypass the landing gear lever lock.

Front 4

What holds the main gear in place when they are up?

Back 4

Mechanical uplocks.

Front 5

What holds the nose gear in place when it is up?

Back 5

An overcenter lock and enclosed by doors which are mechanically linked to the gear.

Front 6

What does placing the LANDING GEAR lever in the OFF position do?

Back 6

Hydraulic pressure is removed from the landing gear system

Front 7

What protection is there to keep a damaged tire from spinning into the wheel well?

Back 7

When a fitting in the wheel well ring opening is impacted, that gear stops retracting and free falls back to the down position. The affected gear cannot be retracted until the fitting is replaced.

Front 8

What does the Landing Gear Transfer Unit do?

Back 8

It uses hydraulic system B pressure to raise the landing gear.

Front 9

What conditions would cause the landing gear transfer unit to operate?

Back 9

•airborne, •No. 1 engine RPM drops below a limit value, •LANDING GEAR lever is positioned UP, •either main landing gear is not up and locked

Front 10

What happens when the LANDING GEAR lever is moved to DN?

Back 10

Hydraulic system A pressure is used to release the uplocks. The landing gear extends by hydraulic pressure, gravity and air loads.

Front 11

What keeps the landing gear down and locked?

Back 11

Overcenter mechanical and hydraulic locks hold the gear at full extension.

Front 12

Do the nose wheel doors remain open when the gear is down?

Back 12

Yes

Front 13

How does the manual landing gear extension work?

Back 13

Manual gear releases on the flight deck are used to release uplocks that allow the gear to free–fall via gravity and air loads to the down and locked position.

Front 14

What happens when you open the manual extension access door?

Back 14

•manual landing gear extension is possible with the LANDING GEAR lever in any position, •normal landing gear extension is possible if hydraulic system A pressure is available, •landing gear retraction is disabled.

Front 15

Can the landing gear be retracted normally following a manual extension?

Back 15

Yes, by: •closing the manual extension access door, •moving the LANDING GEAR lever to DOWN with hydraulic system A pressure available, and then, •positioning the LANDING GEAR lever to UP

Front 16

When is nose wheel steering available?

Back 16

The nose gear is in the down position and compressed by weight of the airplane.

Front 17

When is hydraulic pressure available to the steering metering valve?

Back 17

When positioning the landing gear control lever to down.

Front 18

What conditions are necessary to activate alternate nose wheel steering?

Back 18

NOSE WHEEL STEERING switch is placed to ALT, normal quantity is in the system B reservoir, and the airplane is on the ground.

Front 19

When would alternate nose wheel steering not be available?

Back 19

A hydraulic leak downstream of the Landing Gear Transfer Unit, resulting in a loss of hydraulic system B fluid in the reservoir, would cause a sensor to close the Landing Gear Transfer Valve.

Front 20

How do you depressurize the nose wheel steering for pushback?

Back 20

A lockout pin may be installed in the towing lever to depressurize nose wheel steering OR you can depressurize hydraulic system A.

Front 21

What powers the alternate brake system?

Back 21

Hydraulic system A

Front 22

What system pressurizes the brake accumulator?

Back 22

B

Front 23

What is the purpose of the brake accumulator?

Back 23

It provides several braking applications or parking brake application if both normal and alternate brakes fail.

Front 24

Which systems is antiskid protection provided?

Back 24

Normal and alternate brake systems.

Front 25

What is the difference between antiskid protection for the normal and alternate brakes?

Back 25

The normal brake hydraulic system provides each main gear wheel with individual antiskid protection. The alternate brake hydraulic system provides antiskid protection for main gear wheel pairs instead of individual wheels.

Front 26

What other protections does the normal and alternate brake system provide?

Back 26

Locked wheel, touchdown, and hydroplane protection.

Front 27

Is antiskid protection available even with the loss of both hydraulic systems?

Back 27

Yes

Front 28

What does the autobrake system do?

Back 28

It uses hydraulic system B pressure to provide maximum deceleration for rejected takeoff and automatic braking at preselected deceleration rates immediately after touchdown.

Front 29

Will the auto brake system work with the alternate brakes?

Back 29

No

Front 30

Is antiskid system protection provided during autobrake operation?

Back 30

Yes

Front 31

What conditions do you need to arm the RTO mode prior to takeoff?

Back 31

•airplane on the ground, •antiskid and autobrake systems operational, •AUTO BRAKE select switch positioned to RTO, •wheel speed less than 60 knots, •forward thrust levers positioned to IDLE

Front 32

Describe the RTO self test.

Back 32

AUTO BRAKE DISARM light illuminates for one to two seconds and then extinguishes after RTO selection

Front 33

What will trigger RTO auto braking?

Back 33

Wheel speed above 90 kts and thrust levers retarded to IDLE

Front 34

Can RTO be selected in flight?

Back 34

No, the RTO mode is automatically disarmed when both air/ground systems indicate the air mode.

Front 35

What does the system do in the air if RTO is selected?

Back 35

The AUTO BRAKE DISARM light does not illuminate and the AUTO BRAKE select switch remains in the RTO position.

Front 36

What does a red illuminated Landing Gear Indicator Light indicate?

Back 36

-Related landing gear is in disagreement with the LANDING GEAR lever position (either in transit OR unsafe), -Landing gear is not down and locked when below 800 ft AGL and either thrust lever in idle.

Front 37

What does an extinguished red Landing Gear Indicator Light indicate?

Back 37

-Landing gear is down and locked with the Landing Gear Lever DN, -Landing gear up and locked with the Landing Gear Lever UP or OFF.

Front 38

What does an illuminated green Landing Gear Indicator Light indicate?

Back 38

Related landing gear is down and locked.

Front 39

What does an extinguished green Landing Gear Indicator Light indicate?

Back 39

Related landing gear is not down and locked.

Front 40

Can the landing gear warning horn sound if all the landing gear is down and locked?

Back 40

No, the horn is deactivated if all gear is down and locked.

Front 41

What is the difference between the center and overhead panel Landing Gear Indicator Lights?

Back 41

They are a redundant but separate set of indicator circuits and lights. Landing gear is down and locked if at least one indicator on the center and overhead panel for each gear is green.

Front 42

What would cause the amber AUTO BRAKE DISARM light to illuminate?

Back 42

-Manual brakes applied during RTO or landing, -A malfunction exists in automatic braking system, -RTO mode selected on ground (illuminates two seconds then extinguishes), -SPEED BRAKE lever moved to down detent during RTO or landing, -Thrust levers advanced during RTO or landing, -Landing made with RTO selected.

Front 43

What would cause the amber AUTO BRAKE DISARM light to be extinguished?

Back 43

-Auto brake OFF or -Auto brake armed.

Front 44

What would cause the amber ANTISKID INOP light to illuminate?

Back 44

A system fault is detected. Also, a fault in the parking brake system MAY make it illuminate.

Front 45

How far will the rudder pedals alone turn the nose wheel?

Back 45

7 degrees.

Front 46

How far will the Nose Wheel Steering Wheel turn the nose wheel?

Back 46

78 degrees.

Front 47

Can the rudder pedal nose wheel steering be combined with the Nose Wheel Steering Wheel?

Back 47

No, the Nose Wheel Steering Wheel overrides the rudder pedals.

Front 48

With RTO selected, what happens if a takeoff is rejected below 90 knots?

Back 48

Nothing. Autobraking is NOT initiated, the AUTO BRAKE DISARM light is NOT illuminated, and the RTO autobrake function remains armed.

Front 49

What happens if a landing is made with RTO selected?

Back 49

No autobraking action occurs and the AUTO BRAKE DISARM light illuminates two seconds after touchdown.

Front 50

After landing, when does autobrake application begin?

Back 50

Both thrust levers are in IDLE and the main wheels spin up.

Front 51

Can you select landing autobrakes after touchdown?

Back 51

Yes, as long as they are selected before decelerating through 30 kts.

Front 52

From which hydraulic pressure source(s) are the parking brakes set with?

Back 52

A or B, or if either are not pressurized, then the brake accumulator.

Front 53

What is the quantity and location of the air/ground sensors?

Back 53

6, two on each landing gear.

Front 54

What does it mean if you are on the ground and a red landing gear indicator light illuminates?

Back 54

There has been a gear sensor failure.

Front 55

What is the Air/Ground system logic for Emergency Exit Doors inflight?

Back 55

Flight locks engage when either engine N2 is above 50% and 3 or more Entry/Service doors are closed

Front 56

What is the Air/Ground system logic for Emergency Exit Doors on ground?

Back 56

Flight locks disengage when either thrust lever is below 53 degrees.

Front 57

What is the Air/Ground system logic for Pack Valves inflight?

Back 57

With one pack operating, regulates to high flow with the flaps up.

Front 58

What is the Air/Ground system logic for Pack Valves on ground?

Back 58

With one pack operating, regulates to high flow only when pack is operating from the APU and both engine bleed switches are off.

Front 59

What is the Air/Ground system logic for Pressurization inflight?

Back 59

Allows programmed pressurization in the automatic modes.

Front 60

What is the Air/Ground system logic for Pressurization on ground?

Back 60

Allows pressurization only at high power settings.

Front 61

What is the Air/Ground system logic for Ram Air inflight?

Back 61

Ram air fans operate whenever packs operate.

Front 62

What is the Air/Ground system logic for Ram Air on ground?

Back 62

Ram air fans operate whenever packs operate. Deflectors are extended.

Front 63

What is the Air/Ground system logic for Wing Anti-ice inflight?

Back 63

Control valves open when switch is ON. Thrust setting and duct temperature logic are bypassed.

Front 64

What is the Air/Ground system logic for Wing Anti-ice on ground?

Back 64

When switch is ON, valves cycle open or closed based on thrust/temperature logic. Switch trips OFF at liftoff.

Front 65

What is the Air/Ground system logic for Autothrottle inflight?

Back 65

Enables go-around below 2000 ft radio altitude.

Front 66

What is the Air/Ground system logic for Autothrottle on ground?

Back 66

Disengaged 2 seconds after landing. Takeoff mode enabled.

Front 67

What is the Air/Ground system logic for TO/GA switches inflight?

Back 67

Flight director engages go around mode.

Front 68

What is the Air/Ground system logic for TO/GA switches on ground?

Back 68

Flight director engages takeoff mode.

Front 69

What is the Air/Ground system logic for ACARS inflight?

Back 69

Send out signal at strut extension for takeoff.

Front 70

What is the Air/Ground system logic for ACARS on ground?

Back 70

Send out signal at strut compression for landing.

Front 71

What is the Air/Ground system logic for Voice Recorder inflight?

Back 71

Prevents tape erasure.

Front 72

What is the Air/Ground system logic for Voice Recorder on ground?

Back 72

Allows tape erasure when parking brake is set.

Front 73

What is the Air/Ground system logic for Engine Idle Control inflight?

Back 73

Enables minimum flight idle.

Front 74

What is the Air/Ground system logic for Engine Idle Control on ground?

Back 74

Enables minimum ground idle.

Front 75

What is the Air/Ground system logic for Thrust Reverser inflight?

Back 75

Thrust reverse disabled.

Front 76

What is the Air/Ground system logic for Thrust Reverser on ground?

Back 76

Thrust reverse enabled.

Front 77

What is the Air/Ground system logic for APU Fire Horn inflight?

Back 77

Wheel well horn disabled.

Front 78

What is the Air/Ground system logic for APU Fire Horn on ground?

Back 78

Wheel well horn enabled.

Front 79

What is the Air/Ground system logic for Cargo Fire Protection inflight(A6-FEH and on)?

Back 79

Second extinguishing bottle timer enabled.

Front 80

What is the Air/Ground system logic for Cargo Fire Protection on ground(A6-FEH and on)?

Back 80

Second extinguishing bottle timer disabled.

Front 81

What is the Air/Ground system logic for Speed Brake Lever Actuator inflight?

Back 81

Can be armed to raise ground spoilers for landing.

Front 82

What is the Air/Ground system logic for Speed Brake Lever Actuator on ground?

Back 82

Activates SPEED BRAKE lever on landing if armed. Rejected takeoff feature available. Drives to down when thrust lever advanced.

Front 83

What is the Air/Ground system logic for Auto Slat inflight?

Back 83

System enabled with flaps 1 - 25 selected. PTU available if system B pressure is lost.

Front 84

What is the Air/Ground system logic for Auto Slat on ground?

Back 84

System is disabled.

Front 85

What is the Air/Ground system logic for Flight Recorder inflight?

Back 85

Operates any time electrical power is available.

Front 86

What is the Air/Ground system logic for Flight Recorder on ground?

Back 86

Operates any time electrical power is available and either engine is operating.

Front 87

What is the Air/Ground system logic for FMC inflight?

Back 87

FMC position updated from GPS, DME, or VOR/DME.

Front 88

What is the Air/Ground system logic for FMC on ground?

Back 88

FMC position updated from GPS.

Front 89

What is the Air/Ground system logic for Standby Hydraulic inflight?

Back 89

Pump automatic operation with flaps extended and A or B pressure lost.

Front 90

What is the Air/Ground system logic for Standby Hydraulic on ground?

Back 90

Automatic operation enabled when wheel speed is above 60 kts.

Front 91

What is the Air/Ground system logic for Antiskid inflight?

Back 91

Releases normal or alternate brakes for touchdown protection.

Front 92

What is the Air/Ground system logic for Antiskid on ground?

Back 92

Allows normal antiskid braking after wheel spin up.

Front 93

What is the Air/Ground system logic for Autobrake inflight?

Back 93

Allows selection of landing mode.

Front 94

What is the Air/Ground system logic for Autobrake on ground?

Back 94

RTO mode is available and landing mode may be selected after touchdown if wheel speed is greater than 30 kts.

Front 95

What is the Air/Ground system logic for Landing Gear Lever Lock inflight?

Back 95

Lever lock solenoid released.

Front 96

What is the Air/Ground system logic for Landing Gear Lever Lock on ground?

Back 96

Lever lock solenoid latched.

Front 97

What is the Air/Ground system logic for Landing Gear Transfer Unit inflight?

Back 97

Enabled.

Front 98

What is the Air/Ground system logic for Landing Gear Transfer Unit on ground?

Back 98

Disabled.

Front 99

What is the Air/Ground system logic for Stall warning inflight?

Back 99

Enabled.

Front 100

What is the Air/Ground system logic for Stall Warning on ground?

Back 100

Disabled.

Front 101

What is the Air/Ground system logic for Takeoff Warning inflight?

Back 101

Disabled.

Front 102

What is the Air/Ground system logic for Takeoff Warning on ground?

Back 102

Enabled.