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Use caution when using ADF and/or VOR raw data. ADF orientation (true or
magnetic) is determined by the heading reference selected by the crew. VOR
radials are displayed according to the orientation of the VOR station.
October 31, 2006
777/787 Flight Crew Training Manual
Climb, Cruise, Descent and
Holding
Copyright © The Boeing Company. See title page for details.
FCT 777/787 Preliminary (TM) 4.17
Communications should be handled according to the applicable enroute charts.
Above 82 degrees N, SATCOM is unavailable. HF frequencies and HF SELCAL
must be arranged by the flight crew prior to the end of SATCOM coverage.
Routine company communications procedures should include flight following to
enable immediate assistance during a diversion or other emergency.
777-200 - 777-300ER
Note: To use SATCOM on the ground, the ADIRU must be aligned.
787-8
Note: To use SATCOM on the ground, the IRSs must be aligned.
When navigating in the polar regions, magnetic heading should be considered
unreliable or totally useless for navigation. Magnetic variations typically are
extreme, often are not constant at the same point and change rapidly as airplane
position changes. Ensure the computer flight plan shows true tracks and true
headings. Grid headings may also be used as a reference for those airplanes
equipped with grid heading indicators although no airplane systems use grid
heading. For some high latitude airports, grid headings are shown on the
instrument approach procedures. Note that unmapped areas in the GPWS terrain
data base display as magenta dots on the map, regardless of the airplane altitude.
The primary roll mode for polar operations should be LNAV, which may be used
with the heading reference switch in the NORM position. HDG SEL/HOLD and
TRK SEL/HOLD are functional but require the manual selection of TRUE
heading reference. Deviations from planned route may be accomplished in TRK
SEL or HDG SEL.
If either the North Pole (NPOLE) or the South Pole (S90EXXXXX or
S90WXXXXX) waypoint is used, a rapid heading and track reversal occurs
passing the polar waypoint. If operating in HDG/TRK SEL or HDG/TRK HOLD
while near either pole, it is necessary to frequently update the heading/track
selector to reflect the rapidly changing and/or reversed heading/track or the AFDS
will command an unwanted turn. For this reason, LNAV is the preferred roll mode.
Loss of both GPS units results in an increased ANP and possible display of the
NAV UNABLE RNP message but normally would not prevent polar operation.
October 31, 2006
777/787 Flight Crew Training Manual
Climb, Cruise, Descent and
Holding
Copyright © The Boeing Company. See title page for details.
4.18 FCT 777/787 Preliminary (TM)
777-200 - 777-300ER
The ADIRU is a fault tolerant unit. Total failure of the ADIRU is an extremely
unlikely event since a number of independent failures must occur before all
navigation functions are lost. In the unlikely event the ADIRU does fail, the
non-normal checklist provides the crew with inoperative items and necessary
crew actions. With at least one GPS operational, the Navigation Display is
operational and accurately displays the FMC route and airplane track and position
information. LNAV is inoperative. A heading reference must be entered into the
FMC to regain use of the compass rose. Because of the large and rapidly changing
magnetic variations in the polar regions, it may be more practical to enter the true
track as a heading reference while in the polar region. This provides a more
intuitive navigation display and allow tracking of the planned route in HDG SEL.
True track may be obtained from the computer flight plan or from the Navigation
Display. Magnetic compass information should be used, if available, to update the
heading reference when departing the polar region. With a total ADIRU failure,
plan a raw data ILS or Non-ILS approach.
787-8
The IRS is a fault tolerant unit. Total failure of the IRS is an extremely unlikely
event since a number of independent failures must occur before all navigation
functions are lost. In the unlikely event the IRS does fail, the non-normal checklist
provides the crew with inoperative items and necessary crew actions. With at least
one GPS operational, the Navigation Display is operational and accurately
displays the FMC route and airplane track and position information. LNAV is
inoperative. A heading reference must be entered into the FMC to regain use of
the compass rose. Because of the large and rapidly changing magnetic variations
in the polar regions, it may be more practical to enter the true track as a heading
　
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