XPNDR – transponder operates with altitude reporting.
TA ONLY – enables display of traffic advisory TCAS targets.
TA/RA – enables display of traffic advisory and resolution advisory TCAS targets.
Refer to Chapter 15, Warning Systems.

TEST Switch
Push – initiates self–test.

Identification (IDENT) Switch
Push – transmits an identification signal.

Transponder Switch
TEST – the ATC FAIL light illuminates to indicate the selected transponder is
operational.
STBY – disables transponder modes.

Note:  Transponder modes are enabled only when the airplane is airborne, except for mode S, which operates continuously when the transponder mode selector is out of STBY.
ALT OFF – transponder operates without altitude reporting.
ALT ON – transponder operates with altitude reporting.
TA – enables display of traffic advisory TCAS targets.
TA/RA – enables display of traffic advisory and resolution advisory TCAS targets.
Refer to Chapter 15, Warning Systems.

Copyright . The Boeing Company. See title page for details.
11.10.26   December 1, 2000

Flight Management, Navigation -Controls and Indicators 737 Operations Manual

Air Traffic Control (ATC) Code Selector
Rotate – sets transponder code in transponder.

Transponder Selector
1 – selects transponder No. 1. 2 – selects transponder No. 2.

Identification (ATC IDENT) Switch
Push – transmits an identification signal.

ATC Code Indicator
Shows transponder code.
Shows operating transponder (1 or 2).

Transponder (ATC) FAIL Light
Illuminated – indicates transponder malfunction or test.

Altitude Reporting Switch
1 – enables altitude reporting from ADC No. 1. 2 – enables altitude reporting from ADC No. 2.
1  2  3 

4  5  6 

7  0  CLR 

Altitude Reporting (ALT RPTG) Switch
1 – enables altitude reporting from air data computer No. 1. OFF – transponder operates without altitude reporting. 2 – enables altitude reporting from air data computer No. 2.
Flight Management, Navigation -Controls and Indicators 737 Operations Manual

Transponder (ATC) Switch
1 – selects transponder No. 1. 2 – selects transponder No. 2.

ATC Function Switch
STBY – transponder modes disabled.
ON – selected transponder is on.
AUTO – selected transponder is active when the airplane is in the air.

Air Traffic Control (ATC) Code Switches
Push –
.
numeric switches – set transponder code in transponder

.
CLR switch –

.
first time clears display code

.
second time restores previous code.

 ATC Code Indicator
Shows transponder code.
Displays “F” if a fault in the transponder system is detected.

FAULT Light
Illuminated(white) – indicates system fault has been detected.

Identification (IDNT) Switch
Push – transmits an identification signal.
Copyright . The Boeing Company. See title page for details.
11.10.28  December 1, 2000

Flight Management, Navigation -Controls and Indicators
Weather Radar Panel

Weather Radar Mode Switches
Push – selects mode.
.  
TEST – shows test pattern on map display with WXR selected (except in PLAN mode) and tests transmitter (transmits only up to one second).

.
WX – shows weather radar returns at selected gain level

.  
WX+T (turbulence) – shows weather radar returns and turbulence. Turbulence display is available on the EHSI if the selected map range is 50 nautical miles or less

Note:  Turbulence detection requires presence of detectable precipitation. Clear air turbulence cannot be detected by radar.

.
MAP – shows ground returns at selected gain level

.
IDNT – suppresses ground return in WX and WX+T modes

Note:  Continuous operation is not recommended because weather return intensity may be reduced.

.  
STAB – stabilizes the system from the IRS, placing the antenna under
control of the receiver–transmitter to correct for changes in airplane
attitude.

GAIN Control
Rotate – sets gain in WX, WX+T, and MAP modes.
CAL (calibrated) – gain is set to calibrated level in the full counterclockwise position.
　
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