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provide flight planning, navigation, and performance information to the crew. ND
map center and map expanded modes are still available. LNAV and VNAV
guidance coupled to the autopilot however are not available when the IRS is
inoperative.
The CDU POS INIT page displays the SET HDG prompt immediately after any
IRU or AHRU failure. However, voted heading information is still being sent to
the IRS from the working IRUs and AHRUs and no aircrew action is required.
Should the IRS fail however, the aircrew must use the SET HDG prompt to
periodically sync the display heading to the standby compass magnetic heading.
The following functions are inoperative after failure of the IRS:
AFDS Modes:
Navigation Functions:
• FMC VNAV pages
• ND Wind Direction and Speed (wind arrow)
• LNAV
• VNAV
• TO/GA
• LOC
• G/S
• FPA
• TRK HOLD/SEL
• HDG HOLD/SEL*
787 Flight Crew Operations Manual
Flight Management, Navigation -
Navigation Systems Description
Boeing Proprietary 11.20.5
PFD Functions:
• PFD Heading*
Note: *These functions are operative when standby magnetic compass heading
is entered on the POS INIT page.
Note: ND map mode display following IRS failure references TRK.
Note: Autobrakes are also inoperative.
The following additional functions are inoperative after failure of both the IRS and
GPS:
• ND Map (center and expanded)
• CDU active leg course and distance
• CDU direct-to a waypoint
• FMC Alternate Airport DIVERT NOW
• FMC navigation radio autotuning
Air Data and Attitude Sources
The PFDs receive trusted voted air data from the ADRS. The ADRS is composed
of left, center, and right pitot and static systems. The ADRS is completely
independent of the IRS.
Should the ADRS air data become invalid, backup airspeed and altitude are
automatically provided by the IRS and GPS systems. Whenever backup airspeed
is in use, an AOA SPD flag appears on both the PFD and HUD speed tapes.
Whenever backup altitude is in use, a GPS ALT flag appears on both the PFD and
HUD altitude tapes. The airspeed and altitude displayed under this condition is not
adequate for operation in the ATC environment and is intended only to provide a
means to safely land the airplane at the nearest suitable airfield.
The air data modules are remote sensors that convert the sensed analog pressures
to digital values for the air data functions within the ADRS. In addition, the ADRS
receives data from two angle of attack vanes, an airframe mounted dual element
total air temperature probe, and engine TAT sensors.
The integrated standby flight display (ISFD) receives data from the center pitot
static system. Altitude, attitude, and airspeed are independent of IRU and AHRU
values.
787 Flight Crew Operations Manual
Flight Management, Navigation -
Navigation Systems Description
11.20.6 Boeing Proprietary
IRS Schematic, Normal Mode
ISFD
PFD MFD
MFD
PFD
LEFT RIGHT
AFDS
ADRS
LEFT CENTER RIGHT
PITOT PITOT PITOT
STATIC STATIC STATIC
ALTITUDE
AIRSPEED
ATTITUDE
ISFD
ALTITUDE
AIRSPEED
ATTITUDE
HEADING
POSITION
IRS
INERTIAL REFERENCE UNIT
ATTITUDE HEADING REFERENCE UNIT
PRIMARY FLIGHT INSTRUMENTS
160
127
10
10
APP
220
180
240
13000
12600
13200
20
40 200 1
APP 29.92 IN
ATT RST BARO
HP/IN
12
GPS
MFD
787 Flight Crew Operations Manual
Flight Management, Navigation -
Navigation Systems Description
Boeing Proprietary 11.20.7
IRS Schematic, With NAV INERTIAL SYS Message
ISFD
PFD MFD MFD
MFD
PFD
LEFT RIGHT
ALTITUDE
AIRSPEED
ATTITUDE
HEADING
POSITION
PRIMARY FLIGHT INSTRUMENTS
ADRS
LEFT CENTER RIGHT
PITOT PITOT PITOT
STATIC STATIC STATIC
ALTITUDE
AIRSPEED
ATTITUDE
ISFD
160
127
10
10
APP
220
180
240
13000
12600
13200
20
40 200 1
APP 29.92 IN
ATT RST BARO
HP/IN
12
GPS
787 Flight Crew Operations Manual
Flight Management, Navigation -
Navigation Systems Description
11.20.8 Boeing Proprietary
IRS Schematic, With NAV AIR DATA SYS Message
Air Data Reference System (ADRS)
The ADRS calculates airplane altitude and airspeed for the displays, flight
management system, flight controls, engine controls, and other systems. The
　
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