NORMAL –
.
left FMC controls CDUs and provides input to the autothrottle system

.
right FMC operates in synchronization with left FMC

.
maps display composite information from both FMCs BOTH ON R –

.
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.
FMC Alert Light

FMC Alert Light
Illuminated (amber) – YA613, YA626
.
the FAIL light on CDU(s) is illuminated, or

.
an alerting message exists for both CDUs, or

.
test switch is in position 1 or 2.

Push – both pilots’ FMC alert lights extinguish.
Copyright . The Boeing Company. See title page for details.
11.10.12   March 28, 2005

Flight Management, Navigation -Controls and Indicators
Global Positioning System (GPS) Light
ALIGN  ON DC 
FAULT  DC FAIL 

ALIGN  ON DC 
FAULT  DC FAIL 

Global Positioning System (GPS) Light
Illuminated (amber) –
.
indicates failure of both GPS sensor units

.  
indicates failure of a single GPS sensor unit when either system
annunciator panel is pushed to initiate a recall

.  
with single GPS sensor failure, light extinguishes when the system recall is reset.

Copyright . The Boeing Company. See title page for details.
Flight Management, Navigation -Controls and Indicators

Inertial System
IRS Display Unit (ISDU)

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 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).

Copyright . The Boeing Company. See title page for details.
11.10.14   March 28, 2005

Flight Management, Navigation -Controls and Indicators 737 Flight Crew Operations Manual
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. For alignments greater than 15 minutes, the
window displays 15 until the time remaining reaches 14 minutes. The
display then counts down in one minute intervals.

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).

Keyboard
Push –
.
alpha keys:

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

.
pushing 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.

Copyright . The Boeing Company. See title page for details.

Flight Management, Navigation -Controls and Indicators 737 Flight Crew Operations Manual

Clear (CLR) Key
Illuminated (white) – an ENT attempt has failed (entry not accepted by IRS).
Push – clears data display of any data not yet entered or accepted. If illuminated, cue lights extinguish.
　
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