737 Flight Crew Operations Manual
Flight Management, Navigation -
Controls and Indicators
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
11.10.24 D6-27370-866-EGP
Transponder Panel
1 Transponder (XPNDR) Selector
1 – selects transponder No. 1.
2 – selects transponder No. 2.
2 Air Traffic Control (ATC) Code Selector
Rotate – sets transponder code in transponder.
3 Air Traffic Control (ATC) Code Indicator
Shows transponder code.
Shows operating transponder (1 or 2).
4 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 (traffic advisory/resolution advisory) –
Refer to Chapter 15, Warning Systems.
5 Identification (IDENT) Switch
Push – transmits an identification signal.
2
ALT SOURCE
IDENT
FAIL
ATC 1
2
A
T
C
XPNDR
XPNDR
TA ONLY
ALT RPTG
OFF
STBY
1
1
XPNDR
TA/RA
T
S
C
A
TEST
AFT ELECTRONIC PANEL
1
6
3
7
2
4
5
September 15, 2016
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