2016 PC Guide - Flight Controls - Main5

Question 1

What does the SPEED BRAKE DO NOT ARM light indicate when airborne with the flaps up?

Answer 1

A fault occurred in the auto speed brake system OR wind load alleviation system (as installed)

Question 2

I you get SPEED BRAKE DO NOT ARM light on approach, are any OPC adjustments required?

Answer 2

YES

You must go to the MEL button and then select Auto Speed Brakes Inop.

Question 3

What causes the SPEED BRAKE EXTENDED light to illuminate?

Answer 3

The speed brake lever is beyond the armed position, and…

- Trailing Edge Flaps are more than 10 or...
- RA is less than 800 ft.

Question 4

What conditions must be met for the speed brakes to automatically deploy on landing?

Answer 4

• Speed Brake lever in the armed position
• Speed brake armed light illuminated
• RA less than 10 ft
• Landing gear strut compression or wheel spin up
• Both thrust levers at idle

Question 5

Are there any limitations associated with Speed Brake usage?

Answer 5

YES

• Do not use below 1000 ft AGL
• in flight, do not use with flaps extended
• in flight, do not extend beyond flight detent.

Question 6

What is the purpose of the wing load alleviation system?

Answer 6

The load alleviation system protects the wing from exceeding design load margins with flight spoilers deployed under certain high gross weight and airspeed conditions.

If the system is activated, it will automatically move the speed brake handle to the 50% position.

Movement past the 50% point is restricted by in an emergency can be overridden.

Question 7

What types of Leading Edge Devices are installed on the B737 and what are their normal positions?

Answer 7

LE Flaps - Up or Full Extend

LE Slats - Up, Extend or Full Extend

Question 8

What does the LE FLAPS TRANSIT light indicate?

Answer 8

Leading Edge devices are not in the commanded position

or

leading edge asymmetry is detected

Question 9

When do the Leading Edge Slats move to Full Extend position in the:

• Classic:
• 700:
• 800:

Answer 9

Flap lever is moved beyond…

• Classic: 5
• 700: 5
• 800: 25

Question 10

What is the maximum altitude for extending the flaps?

Answer 10

20,000 ft

Question 11

When is the Trailing Edge Flap Load Relief function operative?

• Classic
• 700
• 800

Answer 11

Trailing edge flaps in positions:

• Classic: 40
• 700: 30 and 40
• 800: 10, 15, 25, 30 and 40

Question 12

If Trailing Edge Flap Load Relief is activated, will the flaps move when a new position is selected.

Answer 12

NO

Question 13

What is the difference between the Classic and NG flap asymmetry detection?

Answer 13

The NG has a Flap Slat Electronic Unit (FSEU)

The classic has a comparator switch in the indicator.

Question 14

If a go-around is conducted after experiencing at TE Flap asymmetry, what is your (PF) initial callout?

Answer 14

“GO AROUND”

Question 15

If a go-around is conducted after experiencing at TE Flap asymmetry, what are the pilot monitoring (PM) actions when the PF calls “Go Around”

Answer 15

• Verify TO/GA on the FMA
• Reply “GO AROUND”
• Adjust thrust levers as necessary
• Verify go-around pitch attitude (15 deg initially)

Question 16

What will happen when you position the landing gear lever UP, after a go-around with a flap asymmetry?

Answer 16

It will retract the landing gear and the landing gear configuration warning horn will sound.

Question 17

After a go-around with a flap asymmetry, and hearing the gear configuration horn sound, should you consider maintaining your current configuration?

Answer 17

Yes, in order to minimize distractions.

Question 18

When manually flying the aircraft, can the stab trim wheel move automatically.

Answer 18

YES - the speed trim system will automatically move the stab trim in conditions like takeoff, climb and go-around

Question 19

What conditions have to exist for the speed trim system to operate?

Answer 19

The system operates if the aircraft has a

• low gross weight and
• aft CG and
• high thrust setting with the autopilot off.

Question 20

What does the Mach Trim system do?

Answer 20

Provides automatic repositioning of the elevators as a function of Mach number to prevent Mach Tuck (the control column will move)

Question 21

Where can you find max speeds to operate with the Mach Trim inop.

Answer 21

AOM Chapter 2 (limitations)
QRH Section 9
Mach Trim System MEL

• NG: 280 kts / 0.82 Mach
• CL: 0.74 Mach

Question 22

What does the Autoslat system do?

Answer 22

Provides stall protection by moving the LE slats from EXT to FULL EXT position prior to stick shaker to improve stall characteristics at high angles of attack.

Question 23

Does the Autoslat system work if the aircraft is clean?

Answer 23

No,

The trailing edge flaps must be positioned 1, 2 or 5 (and 10, 15 and 25 in the -800).

Question 24

What are the primary and backup power for the Autoslats?

Answer 24

Primary - Hydraulic System B

Backup - System A powers the PTU which uses residual system B fluid to drive Autoslats.

Question 25

What is the purpose of the STAB TRIM MAIN ELECT and the STAB TRIM AUTOPILOT cutout switch located on the control stand.

Answer 25

To allow autopilot or main electric trim inputs to be disconnected from the stabilizer trim motor.

Question 26

Is there another way to stop operation of the Main electric and autopilot trim other than the cutout switches?

Answer 26

YES

The control column actuated cutout switches stop the main electric and autopilot trim when the control column movement opposes trim direction.

Question 27

What is the purpose of the STAB TRIM override switch on the center pedestal?

Answer 27

When the STAB TRIM OVERRIDE switch is positioned to OVERRIDE, electric trim can be used regardless of control column position.

Question 28

What does the stabilizer trim well do?

Answer 28

Manually positions the stabilizer.

Manual rotation of the trim wheel can be used to override autopilot or main electric trim.