Embraer EMB145 - Page 548

ABNORMAL
PROCEDURES
AIRPLANE
OPERATIONS
MANUAL
1-03-59
Page
12
Code
03
REVISION 40
AOM-145/1114
IRS/MSU FAILURE ANNUNCIATION
LIGHT
OPERATION PHASE
POWER ON ALIGNMENT IN FLIGHT
ALIGN
 No light:
 Check IRS
CB’s.
 Set mode
select switch to
ALIGN or NAV.
 Press MSU
Test switch.
Annunciator
bulb must be
replaced if the
other MSU
annunciators
do light.
 Flashes
immediately after
entry:
 Check and
reenter latitude
or longitude.
 Reenter same
latitude or
longitude.
 Flashes at the end
of alignment:
 Enter latitude.
 Check and
reenter latitude.
 Allow additional
time for
alignment.
 Flashes:
 Select the
remaining IRU
by pressing the
IRS Button on
the associated
reversionary
panel.
 If necessary set
mode select
switch to ATT.
FAULT

Set mode select
switch to OFF for
at least 3 sec.
Then set mode
select switch back
to ALIGN or NAV.

Associated with
ALIGN
annunciation:

Recheck
coordinates and
reenter latitude.

Allow additional
time for
alignment.

Try new
alignment. Set
mode select
switch to OFF
for at least 3
sec, then to
ALIGN, and
enter present
position.
 Select the
remaining IRU by
pressing the IRS
Button on the
associated
reversionary panel.
 If necessary set
mode select switch
to ATT.