787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Flight Management, Navigation -
Controls and Indicators
Copyright © The Boeing Company. See title page for details.
D615Z003-TBC 11.10.11
Inertial System
Inertial Reference System (IRS)
Illuminated (white) – airplane battery powers IRS.
Note: ON BAT light illuminates only when IRS has been aligned on airplane or
ground power, and primary power is subsequently removed or failed
(battery power only remains). On the ground, a warning horn is sounded in
the nose wheel well to alert the ground crew that the IRS is depleting the
battery.
ON – applies power to the associated IRS.
OFF – removes power from the associated IRS.
Note: IRS selectors must be pulled out before moving to the OFF position.
1
On Battery (ON BAT) Light
2
IRS Selectors
OVERHEAD PANEL
ON
OFF
ON
OFF
IRS
RIGHT
ON BAT
LEFT
2
1
June 16, 2008
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