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magnetic variation along the route and
converts back and forth so that we have an
accurate route to follow. In the far North
however, the lines of variation start to get
closer and closer together to the extent
that in one particular area, they are so
close that the distance between the
computed variation changes so rapidly with
our groundspeed that the computations
can’t keep up. When that happens, the
FMS, along with the HSI in some aircraft
such as the Global Express show a big red
“HDG FAIL” upon entering the “keyhole”. In
fact, above 73° North and below 60°
South, it won’t compute variation at all
because the lines of variation are too close
at those latitudes (north and south) and are
not even stored in the variation database.
So all navigation above and below those
regions is in True all the time.
Ok, so now we can answer the first part of
the first question, “What is it?” At the same
time we answer the second question,
“Where is it?” Basically, it’s a box from the
ground up, the location of which is fairly
specifically located between 90° and 120°
West longitude and 70° to 72° North
latitude. Because the FMS cannot keep up
with the variation changes, your FMS will
annunciate, as you enter the keyhole,
“ACTIVE MODE IS MAG HDG” and your
HSIs annunciate the red “HDG FAIL” until
you manually switch to TRUE. I’ve flown
through it several times and you can see it
happen almost to the degree although it
does vary minutely. A flight from Seattle
(KBFI) to Stockholm (ESKN) for example,
takes you right through the keyhole.
Now, what do you do about it? The answer
is, basically nothing. In the Global Express,
the HSIs go into “HDG FAIL” mode, but the
airplane is still navigating as it always has.
Nothing is wrong and nothing changes
except what you see on the HSIs and the
FMS. If you choose to go into manual
“TRUE” mode, simply go into Nav/Maint/Pg
3 and switch manually to Selected Hdg
Mode “TRUE” (2R) and your HSIs come
back. If you do nothing, it will come out the
other side on its own and operations will
appear normal. I believe that other types
such as the GV series do change to TRUE
mode on the HSIs without pilot input.
Bottom line, not a big deal, unless you’re
not expecting it and don’t know what it is.
That can be a cause for concern until you
either figure it out or you come out the
other end wondering what just happened.
Customer Corner
6
Upcoming FMS Seminars and Briefings
Set Up Procedures for the NZ-2000
Navigation Computer
When installing a new NZ-2000 Navigation
Computer, or sending a NZ-2000 for a software
mod, repair or upgrade, it may be necessary to
perform the following steps:
• Load the current Navigation Database (NDB).
See Section 6 of the FMS Pilot Manual
(DATA LOAD)
• Load the Aircraft Database (ACDB). (G-IV’s
skip this step) See Section 6 of the FMS
Pilot Manual (DATA LOAD)
The ACDB’s are located on Disk 1 and Disk
2 of the NDB. Software versions 4.1 to 4.5
use V1. (Example: H800A-V1). The exception
to this is that 4.1 Mod F uses V2. Software
Versions 4.8 and greater use V2.
(Example: H800A-V2 )
Disk 1 of the Navigation database contains a
document identifying all ACDBs contained in
the current cycle and the applicable
aircraft/FMS software version. (ACDB.pdf)
• After Loading the ACDB you must enter the
aircraft tail number into the FMS. This is
done on PERF INIT page one
• Set up the Vspeed labels. After loading or
reloading an aircraft database on non-TOLD
equipped aircraft, Vspeed label names and
their values need to be reset. Once the
aircraft database is loaded, the following
steps can be taken to ensure these labels
are set.
From the NAV IDENT page:
• Push MAINTENANCE (4L),
• NEXT, SETUP (4L),
• VSPD LABELS (2L).
This brings up the T.O. VSPEED LABELS
page where the labels are named. After
naming, push SAVE (4L).
• The Vspeed label values are then entered in
the TAKEOFF and LANDING pages, while
performing PERF INIT.
A60-1128-000-000
September 2009
© 2009 Honeywell International Inc.
C O N T A C T I N F O R M A T I O N
Honeywell Aerospace
1944 E. Sky Harbor Circle
Phoenix, AZ 85034 USA
AeroTechSupport@honeywell.com
800-601-3099
　
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