737 MAX Flight Crew Operations Manual
Flight Management, Navigation -
Controls and Indicators
MN-FLT-OH-201
11.10.23
5
Identification (IDENT) Switch
Push – transmits an identification signal.
6
Transponder (ATC) FAIL Light
Illuminated (amber):
• indicates transponder malfunction or
• ADS-B inoperative.
7
Altitude (ALT) Selector
1 – enables altitude reporting from air data computer No. 1.
2 – enables altitude reporting from air data computer No. 2.
1B785, 1B786, 1J585 - 1J594
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.
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
March 1, 2021