787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Flight Instruments, Displays -
Controls and Indicators
Copyright © The Boeing Company. See title page for details.
10.10.48 D615Z003-TBC
ALTN – non-normal position. The PFD and HUD alternate air data/attitude source
is selected as follows:
• air data – backup airspeed and altitude are displayed on the onside PFD,
HUD and ND
• attitude – ISFD attitude displayed on the onside PFD and HUD
Heading Reference
Heading Reference Controls
Pushing alternately selects the heading reference for the PFDs, NDs, AFDS, and
FMCs.
NORM –
• normally references magnetic north
• automatically references true north when north of 82°N or south of 82°S
latitude or within the vicinity of the magnetic poles (PFDs, NDs, and
FMCs)
• provides no reference for AFDS roll modes other than LNAV when north
of 82°N or south of 82°S latitude or in the vicinity of the magnetic poles
TRUE – references true north regardless of latitude.
When the AFDS roll mode is HDG SEL, switching the heading reference switch
from NORM to TRUE or TRUE to NORM engages the HDG HOLD mode.
When the AFDS roll mode is TRK SEL, switching the heading reference switch
from NORM to TRUE or TRUE to NORM engages the TRK HOLD mode.
1
Heading Reference (HDG REF) Switch
HEADING REF
TRUE
NORM
OVERHEAD PANEL
1
February 15, 2010
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