737 MAX Flight Crew Operations Manual
Flight Management, Navigation -
Navigation Systems Description
11.20.12
MN-FLT-OH-201
IRS Instrument Transfer Switch Schematic
Radio Navigation Systems
Automatic Direction Finding (ADF)
1B785, 1B786, 1J585 - 1J594
An automatic direction finding (ADF) system enables automatic determination of
magnetic and relative bearings to selected facilities.
One ADF receiver is installed. The ADF bearing signal is sent to the pointer on
the DUs. The audio is heard by using the ADF receiver control on the audio
selector panel.
If heading or track information is lost or invalid, ADF bearing pointers on the DUs
will be removed. Relative bearings, indicated by pointers, may be correct if the
receiver is operating.
NAV
ALIGN
OFF
ATT
DISPLAY
OUTBOARD
UNIT
NAV
ALIGN
OFF
ATT
R
L IRS
AUTOTHROTTLE
AUTOTHROTTLE
RIGHT IRSs
THE LEFT AND
CAPABILITY BETWEEN
AUTOMATIC SWITCHING
COMPUTER HAS
COMPUTER
RADAR
WEATHER
DISPLAY
INBOARD
DISPLAY
OUTBOARD
NO. 1 DPC
ON R
ON L
BOTH
BOTH
NORMAL
IRS
NORMAL
ON R
BOTH
NO. 2 DPC
UNIT
UNIT
ON L
BOTH
DISPLAY
INBOARD
UNIT
B
AFDS FCC
EACH FLIGHT CONTROL
POSITION
IRS TRANSFER SWITCH
LOGIC DEPENDENT UPON
INTERNAL SWITCHING
COMPUTER HAS
2
2
1
1
2
A
AFDS FCC
AUTO-
PILOT
AUTO-
PILOT
AUTO-
PILOT
AUTO-
PILOT
Pitch
Heading
Pitch
Heading
Roll
Roll
FLIGHT
DIRECTOR
FLIGHT
DIRECTOR
All
All
AFDS FCC USES
FROM IRS
OFF-SIDE ROLL DATA
ON-SIDE PITCH AND
3
March 1, 2021
