.
selects right FMC for all FMC operations

.
left map will annunciate “FMC R.”

Note:  Moving the source select switch will cause LNAV and VNAV to disengage.
Copyright . The Boeing Company. See title page for details.
11.10.6   December 1, 2000

Flight Management, Navigation -Controls and Indicators 737 Operations Manual
FMC Alert Light
A/P  A/T  FMC 
P/RST  P/RST  P/RST 

FMC Alert Light
Illuminated (amber) –
.
the FAIL light on both CDUs is illuminated, or

.
an alerting message exists for both CDUs, or

.
the test switch is in position 1 or 2. Push – both pilots’ FMC alert lights extinguish.

Navigation Mode Selector

Flight Management, Navigation -Controls and Indicators 737 Operations Manual

Navigation (NAV) Mode Selector
When the associated flight control computer (FCC A or FCC B) is the master, the
respective selector (Captain or First Officer) determines the source of guidance
and control commands provided to the AFDS. The selector also determines the
source for data displays.

FMC – The flight management computer is providing AFDS LNAV and VNAV

commands and display information.
ANS L – The left ANCDU of the alternate navigation system is providing AFDS
LNAV commands and display information.

ANS R – The right ANCDU of the alternate navigation system is providing AFDS

LNAV commands and display information.
When the selector is not in the FMC position, only NAV mode information is
provided to the EHSIs.

Inertial System
IRS Display Unit (ISDU)

Copyright . The Boeing Company. See title page for details.
11.10.8  June 8, 2001

Flight Management, Navigation -Controls and Indicators 737 Operations Manual

Display Selector (DSPL SEL)
TEST (spring–loaded to TK/GS) –
.  
all lights in data displays and on the mode selector unit momentarily
illuminate, followed by a 10 second self-test

.
use only during alignment.

TK/GS –
.
left window displays present true track (course)

.
right window displays present ground speed (knots).

PPOS –
.
left window displays present latitude

.
right window displays present longitude.

WIND –
.
left window displays present inflight true wind direction

.
right window displays present inflight wind speed (knots).

HDG/STS –
.
left window displays present true heading

.
right window displays any applicable maintenance status codes

.  
during alignment, right window displays minutes remaining until
alignment is complete (displays “7” until time remaining is 6 minutes).

Brightness (BRT) Control
Rotate – adjusts brightness of the data displays.

System Display (SYS DSPL) Selector
L – selects left IRS for the data displays.
R – selects right IRS for the data displays.

Enter (ENT) Key
Illuminated (white) – N, S, E, W, or H entries are being keyed.
Push – keyed data is entered into IRS following completion of valid self–test for reasonableness.

Data Displays
Two windows display data for the IRS selected with the system display selector
.
type of data displayed is normally determined by the display selector

.  
keyboard entry of present position or magnetic heading overrides the
selected display

.
last digit of each window is for a decimal place (tenths).

Flight Management, Navigation -Controls and Indicators 737 Operations Manual

Keyboard
Push –
.
alpha keys:

.  
data displays are controlled by the keyboard when the N, S, E, W (latitude/longitude) or H (heading) keys are pressed

.
pressing an alpha key arms the keyboard for numeric entries.

.
numeric keys:

.  
permit manual entry of present position when ALIGN light is
illuminated

.  
permit manual entry of magnetic heading when either mode selector is in ATT.

Clear (CLR) Key
Illuminated (white) – an ENT attempt has failed (entry not accepted by IRS).
Push – extinguishes cue lights and clears data display of any data not yet entered or accepted.
IRS Mode Selector Unit
ALIGN  ON DC 
FAULT  DC FAIL 

ALIGN  ON DC
　
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