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03-05-90: High Latitude Navigation
The Electronic Flight Instrument System (EFIS) does not display magnetic heading
above 73¡N or 60¡S due to loss of valid magnetic heading output from the IRSs. With
FMS displayed as the navigation source, the heading display will automatically switch
from MAG to TRUE at 72¡ 30ÕN. However, the switch from MAG to TRUE at 59¡ 30ÕS is
not automatic and must be accomplished by the pilot on FMS CDU MAINTENANCE
page 3. If TRUE is not selected prior to 60¡S, the compass card on the PFD and ND will
display a red ÒHDG FAILÓ and the course deviation indicators will be removed.
Selection of a short-range navigation source (VOR, ILS, TCN or MLS) above 73¡N or
60¡S will also result in the display of red ÒHDG FAILÓ and removal of course deviation
indicators on the PFD and ND. Attempting to select LNAV or APR on the Guidance Panel
will result in a blue ÒCPL DATA INVALIDÓ message on EICAS. Navigation using either
VOR, ILS, TCN or MLS data above 73¡N or 60¡S latitude requires compliance with the
following special procedures:
1. The Pilot Not Flying (PNF) should select either IRS 2 (dual IRS installation)
or IRS 3 (triple IRS installation) as the PFD heading and attitude source
using the SENSOR menu on the Display Controller.
2. Note current TRUE Heading from the PFD and Magnetic Variation for
current location from available charts. Calculate Magnetic Heading (TRUE
to MAG, add WEST / subtract EAST).
3. On the FMS CDU, select the Position Sensors IRS Status Page for the
selected IRS.
4. Switch the selected IRS to ATT REF mode.
5. When IRS Status Page displays the ÒSET MAG HDGÓ prompt, enter the
Magnetic Heading calculated in Step 2 via the scratchpad.
6. The Pilot Flying (PF) should select the IRS that is in ATT REF for the
approach and landing.
7. Select the appropriate short range NAV source (NAV 1/2, ILS 1/2, TCN
1/2, MLS 1/2) via the Display Controller.
8. VOR / TCN navigation can only be accomplished using raw data. With the
autopilot engaged, the Heading Select mode may lighten pilot workload.
ILS / MLS navigation can be accomplished using APPROACH mode of the
Flight Director and/or Autopilot.
OPERATING MANUAL
EXPANDED NORMAL PROCEDURES 03-05-00
Page 5
May 30/02
Revision 7
CAUTION
NAVIGATION BASED ON THE IRS IN THE ATT REF
MODE SHOULD BE KEPT TO THE MINIMUM TIME
POSSIBLE DUE TO THE IRS DRIFT RATES.
MAGNETIC HEADING INFORMATION BASED ON
THIS PROCEDURE SHOULD BE CLOSELY
MONITORED AND UPDATED WHEN NECESSARY.
NOTE:
To navigate using VOR / ILS / TCH / MLS stations that
are oriented to TRUE NORTH, TRUE heading must be
inserted in Step 5 instead of calculated MAG heading.
03-05-100: Polar Navigation
FMS Navigation in either Polar Region can only be accomplished with NZ-9101 or
NZ-9111 software installed. At 85¡N or S, the NZ-9101 or NZ-9111 will display scratchpad
message ENTERING POLAR REGION. At this point, the FMS selects its highest priority
sensor for navigation. (Under normal circumstances, FMS 1 would use IRS 1 and FMS 2
would use IRS 2.)
The FMS uses its highest priority sensor during all operations in the Polar Region. At
84¡N or S when departing the region, the message EXITING POLAR REGION will be
displayed. The FMS will resume blending of the available sensors upon departure from
the Polar Region.
If the ßight plan requires navigation directly over either Pole, the heading change at the
Pole will be instantaneous. However, the course change to the waypoint past the Pole
will take approximately thirty (30) seconds to occur. With LNAV engaged, the autopilot
will commence a turn to the currently displayed track until the updated desired track to
the next waypoint is displayed.
NOTE:
The PLAN mode on the ND is unusable while at or
near the Poles.
NOTE:
The DBDIs are unusable while in the Polar Region.
OPERATING MANUAL
03-05-00 EXPANDED NORMAL PROCEDURES
Page 6
May 30/02
Revision 7
AFTER LANDING PROCEDURES
03-06-10: After Landing
1. Ignition.............................................................................................................OFF
2. Transponder ..........................................................................................STANDBY
3. Flaps .................................................................................................AS DESIRED
4. Anti-Ice and Anti-Ice Heaters ........................................................................OFF
5. Fuel Boost Pumps .........................................................OFF (ONE EACH SIDE)
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湾流4操作手册 Gulfstream IV Operating Manual 3(37)
