.
TO–FROM ambiguity indicator show a FROM indication.

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

Flight Management, Navigation -Controls and Indicators 737 Operations Manual

ILS TEST Switches With an ILS frequency selected: Push UP/LT–
.
 the glideslope indicates one dot up

.
 localizer indicates one dot left. Push DN/RT–

.
 the glideslope indicates one dot down

.
 localizer indicates one dot right.

Frequency Indicator
Indicates the frequency selected by the frequency selector.

Frequency Selector
Rotate – manually selects the desired frequency.
VHF NAV Transfer Switch

VHF NAV Transfer Switch
BOTH ON 1 – switches the VHF navigation source to VHF NAV receiver No. 1.
NORMAL – VHF navigation source is from default VHF NAV receiver.
BOTH ON 2 – switches the VHF navigation source to VHF NAV receiver No. 2.

Flight Management, Navigation -Controls and Indicators

Transponder Panel

Transponder Air Traffic Control (ATC) Switch
1 – selects transponder No. 1. STBY – does not transmit. 2 – selects transponder No. 2.

 ATC Code Indicator
Shows transponder code.

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

ATC Code Selectors
Rotate – sets transponder code in transponder.

Reply Light
Illuminated (green) –
.
transponder replying to ground interrogation

.
test in progress.

Altitude Reporting (ALT RPTG) Switch
1 – enables altitude reporting from air data computer No. 1. OFF – transponder operates without altitude reporting.
Copyright . The Boeing Company. See title page for details.
11.10.22  June 8, 2001

Flight Management, Navigation -Controls and Indicators 737 Operations Manual
2 – enables altitude reporting from air data computer No. 2.

Test Switch
Push – with the transponder air traffic control (ATC) switch in position 1 or 2, the reply light illuminates to indicate the selected transponder is operational.

Altitude Reporting (ALT RPTG) Switch
ON – enables altitude reporting.
OFF – transponder operates without altitude reporting.

 ATC Code Indicator
Shows transponder code.

ATC Code Selectors
Rotate – sets transponder code in transponder.

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

Transponder Mode Selector
L – selects transponder No. 1.
STBY – does not transmit.
R – selects transponder No. 2.

Flight Management, Navigation -Controls and Indicators 737 Operations Manual

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.

 ATC Code Indicator
Shows transponder code.

ATC Code Selectors
Rotate – sets transponder code in transponder.

FAULT Light
Illuminated (amber) – indicates transponder malfunction.

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

Transponder Mode Selector
TEST – starts ATC transponder functional test for transponder No. 1.
1 – selects transponder No. 1.
STBY – does not transmit.
2 – selects transponder No. 2.
TEST – starts ATC transponder functional test for transponder No. 2.

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

As installed
AFT ELECTRONIC PANEL

Transponder (XPNDR) Selector
1 – selects transponder No. 1. 2 – selects transponder No. 2.

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

Altitude Source Selector
1 – enables altitude reporting from ADC No. 1. 2 – enables altitude reporting from ADC No. 2.

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

Transponder (XPNDR) FAIL Light
Illuminated – indicates transponder malfunction.

Transponder Mode Selector
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.
　
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