Transfer (TFR) Switch
TFR – STANDBY frequency moved to ACTIVE frequency; ACTIVE frequency moved to STANDBY frequency.
Frequency Selector
Rotate – manually selects the standby frequency.
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Flight Management, Navigation -Controls and Indicators
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.
Transponder Panel
YA613, YA626, YC411, YC413
Transponder (ATC) Selector 1 – selects transponder No. 1. 2 – selects transponder No. 2.
Air Traffic Control (ATC) Code Selector
Rotate – sets transponder code in transponder.
Air Traffic Control (ATC) Code Indicator
Shows transponder code.
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Flight Management, Navigation -Controls and Indicators 737 Flight Crew Operations Manual
Shows operating transponder (1 or 2).
Transponder Mode Selector
TEST – starts ATC transponder functional test.
STBY (standby) – does not transmit.
ALT (altitude reporting) OFF – transponder operates without altitude reporting.
ALT (altitude reporting) ON – transponder operates with altitude reporting.
TA(traffic advisory) and TA/RA (resolution advisory) – Refer to Chapter 15,
Warning Systems.
Identification (IDENT) Switch
Push – transmits an identification signal.
Transponder (ATC) FAIL Light
Illuminated (amber) – indicates transponder malfunction.
Altitude (ALT) Selector
1 – enables altitude reporting from air data computer No. 1. 2 – enables altitude reporting from air data computer No. 2. YA686 - YA809, YD651 - YK104
Transponder (XPNDR) Selector 1 – selects transponder No. 1. 2 – selects transponder No. 2.
Air Traffic Control (ATC) Code Selector
Rotate – sets transponder code in transponder.
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Flight Management, Navigation -Controls and Indicators 737 Flight Crew Operations Manual
Air Traffic Control (ATC) Code Indicator
Shows transponder code.
Shows operating transponder (1 or 2).
Transponder Mode Selector
TEST – starts ATC transponder functional test.
STBY (standby) – does not transmit.
ALT RPTG (altitude reporting) OFF – transponder operates without altitude
reporting.
XPNDR (transponder) – transponder operates with altitude reporting.
TA (traffic advisory) ONLY, and TA/RA (resolution advisory) – Refer to Chapter
15, Warning Systems.
Identification (IDENT) Switch
Push – transmits an identification signal.
Transponder (XPNDR) FAIL Light
Illuminated (amber) – indicates transponder malfunction.
Altitude (ALT) SOURCE Selector
1 – enables altitude reporting from air data computer No. 1. 2 – enables altitude reporting from air data computer No. 2. YC153, YC154
AFT ELECTRONIC PANEL
Transponder (XPNDR) Selector
1 – selects transponder No. 1.
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Flight Management, Navigation -Controls and Indicators 737 Flight Crew Operations Manual
2 – selects transponder No. 2.
Air Traffic Control (ATC) Code Selector
Rotate – sets transponder code in transponder.
Air Traffic Control (ATC) Code Indicator
Shows transponder code.
Shows operating transponder (1 or 2).
Transponder Mode Selector
TEST – starts ATC transponder functional test.
STBY (standby) – does not transmit.
ALT RPTG (altitude reporting) OFF – transponder operates without altitude
reporting.
XPNDR (transponder) – transponder operates with altitude reporting.
TA (traffic advisory) ONLY, and TA/RA (resolution advisory) – Refer to Chapter
15, Warning Systems.
Identification (IDENT) Switch
Push – transmits an identification signal.
Transponder (XPNDR) FAIL Light
Illuminated (amber) – indicates transponder malfunction.
Altitude (ALT) SOURCE Selector
1 – enables altitude reporting from air data computer No. 1. 2 – enables altitude reporting from air data computer No. 2.
Traffic Collision Avoidance System (TCAS) Functions
Refer to Chapter 15, Warning Systems.
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