Flaps and leading edge devices (800)

Question 1

How many leading edge flaps are on each wing?

Answer 1

Two

Question 2

How many slats are on each wing?

Answer 2

Four

Question 3

What does the LE FLAPS TRANSIT (amber) tell you?

Answer 3

• any LE device in transit
• any LE device not in programmed position with respect to TE flaps
• a LE uncommanded motion condition exists (two or more LE flaps or slats have moved away from their commanded position)
• illuminates during alternate flap extension until LE devices are fully extended and TE flaps reach flaps 10.
  (Light is inhibited during auto slat operation in flight)

Question 4

What does the LE FLAPS EXT (green) tell you?

Answer 4

• all LE flaps extended and all LE slats in extended (intermediate) position (TE flap positions 1, 2 and 5)
• all LE devices fully extended (TE flap positions 10 through 40).

Question 5

Some 737-800s can land with flap 15, what is the main reason for selecting flap 15 for landing?

Answer 5

Used if approach climb performance is a factor.

Question 6

Flap extension should not be attempted above which altitude?

Answer 6

20,000 feet

Question 7

Which hydraulic system normally extends and retracts the LE devices and TE flaps?

Answer 7

B

Question 8

When the flap lever is moved from UP to 1, 2 or 5 what happens to the LE devices?

Answer 8

LE flaps extend to fully extended position.
LE slats extend to the extend position (intermediate).

Question 9

When the flap lever is moved above position 5 what happens to the LE devices?

Answer 9

LE flaps remain in fully extended position.
LE slats extend to fully extended position.

Question 10

Autoslat operation is normally powered by hydraulic system B. Is there a backup if this fails?

Answer 10

Yes, there is a Power Transfer Unit.
The PTU uses system A pressure to power a hydraulic motorized pump, pressurizing system B fluid to provide power for the autoslat operation

Question 11

How is the ALTERNATE FLAPS system powered?

Answer 11

Electric motor

Question 12

When using alternate flaps the LE flaps and slats are driven to the full extended position using which system?

Answer 12

Standby hydraulic system.

Question 13

Does the alternate flaps system provide asymmetry or skew protection?

Answer 13

No

Question 14

Can the standby hydraulic system retract the LE devices?

Answer 14

No

Question 15

What type of leading edge devices are inboard of each engine?

Answer 15

2 Krueger flaps

Question 16

What type of leading edge devices are outboard of each engine?

Answer 16

4 slats