Copyright . The Boeing Company. See title page for details.
June 1, 2005  9.10.13
Flight Controls -Controls and Indicators

YC411, YC413

FLAP Lever
.  
selects position of flap control valve, directing hydraulic pressure for flap drive unit

.
position of the LE devices is determined by selecting TE flap position

.
flap positions 30 and 40 arm the flap load relief system.

Flap Gates
Prevents inadvertent flap lever movement beyond:
.
position 1 - to check flap position for one engine inoperative go-around

.
position 15 - to check flap position for normal go-around.

Flap Position Indicator
.
indicates position of left and right TE flaps

.
provides TE flaps asymmetry and skew indication.

FLAPS LIMIT Placard
Indicates maximum speed for each flap setting.
Copyright . The Boeing Company. See title page for details.
9.10.14   June 1, 2005

Flight Controls -Controls and Indicators 737 Flight Crew Operations Manual

FLAP LOAD RELIEF Light YC411, YC413
Illuminated (amber) –
.
if flaps are set at 40:

.
flaps retract to 30 due to excess airspeed or

.
if flaps are set at 30:

.
flaps retract to 25 due to excess airspeed.

Copyright . The Boeing Company. See title page for details.
Flight Controls -Controls and Indicators

Leading Edge Devices

Leading Edge Devices (LE DEVICES) Annunciator Panel
Indicates position of individual LE flaps and slats.
Extinguished – related LE device retracted.

Leading Edge Devices TRANSIT Lights
Illuminated (amber) – related LE device in transit.

Leading Edge Devices Extended (EXT) Lights
Illuminated (green) – related LE slat in extended (intermediate) position.

Leading Edge Devices Full Extended (FULL EXT) Lights
Illuminated (green) – related LE device fully extended.

Leading Edge Annunciator Panel TEST Switch
Press – tests all annunciator panel lights.

Leading Edge Flaps Transit (LE FLAPS TRANSIT) Light
Illuminated (amber) –
.
any LE device in transit

.
any LE device not in programmed position with respect to TE flaps

.
a LE slat skew condition exists (slats 2 through 7 only)

.  
during alternate flap extension until LE devices are fully extended and TE flaps reach flaps 10.

Note: Light is inhibited during autoslat operation in flight.
Copyright . The Boeing Company. See title page for details.
9.10.16   June 1, 2005

Flight Controls -Controls and Indicators 737 Flight Crew Operations Manual

Leading Edge Flaps Extended (LE FLAPS EXT) Light
Illuminated (green) –
.  
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).

Flight Control Surface Position Indicator
YA613, YA626, YA801 - YA809, YC411 - YK104

MFD System (SYS) Switch
Push – SYS
.  
displays flight control surface position indications on lower DU; or if the lower DU is unavailable, displays it on upper DU or inboard DU based on the position of the display select panel selector

.
second push removes indications on the respective DU.

Flight Spoilers (FLT SPLR) (white)
Indicates related (left/right) flight spoilers position:
.
top mark depicts flight spoilers fully deployed

.
bottom mark depicts the spoilers down.

Copyright . The Boeing Company. See title page for details.
Flight Controls -Controls and Indicators 737 Flight Crew Operations Manual

Aileron (AIL) (white)
Indicates related (left/right) aileron position:
.
top mark depicts maximum up position

.
center mark depicts neutral position

.
bottom mark depicts maximum down position.

Elevator (ELEV) (white)
Indicates elevator position:
.
top mark depicts maximum up position

.  
center mark depicts neutral position when on the ground and trimmed in
the green band

.
bottom mark depicts maximum down position.

Note:  Elevator neutral position varies with stabilizer position, flap position and Mach. The center index mark is set for nominal takeoff conditions. With certain airplane nose up trim settings, the pointer will be somewhat displaced.

RUDDER (white)
Indicates rudder position:
.
left mark depicts maximum left position
　
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