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would equate to a position accuracy of approximately 1.2 NM or
better of the FMS position on a 95% probability basis. A Q of 01
(one) is best, and as the numbers get larger the position is less
certain
NOTE: When the aircraft is within 300 NM of DME sources, the
POSITION UNCERTAIN message will become active when
the Q exceeds 28. Outside of DME range, a Q of 60 is
required to activate the POSITION UNCERTAIN message.
Once the threshold has been set at 60, it will remain at that
value until the Q displayed on the Sensor Summary page is
reduced to 10 (at which time 28 will once again become the
threshold). When the system position is being corrected by
action of the DME, the message displayed will be
POSITION CORRECTING.
Next to the line select keys are the status or quality factors of the
individual navigation sensors installed. (The sensor's quality factor,
like the system's Q factor, is the sensor's best estimate of its error in
tenths of a nautical mile.) The status displayed next to each sensor
will be one of the following:
D - The associated sensor has been either manually or automatically
deselected.
FAIL - The associated sensor has been detected as failed or the
system has been turned on and no data was received within 12
seconds.
ALIGN - The associated IRS is in the align mode. The aircraft must
remain stationary until alignment is complete.
Section II
Control & Display
2423sv602 2-13
Change 1
ATT - The associated IRS is in the attitude mode. No navigational
data is available.
NAV - The associated IRS is in the navigation mode (alignment is
complete) and navigational data is available.
TEST - Doppler is in self test mode.
UNLOCK - Doppler is in unlock mode.
Each individual sensor's status page may be displayed by pressing
the line select key corresponding to the desired sensor. From this
sensor status page, the sensor may then be deselected or
reselected by pressing the line select key corresponding to the SEL
(select) or DESEL (deselect) option.
NORM - All Doppler velocity labels are being received and indicating
normal status.
MEM - All Doppler labels are being received, none indicate fail, and
one or more indicates memory.
DATA Page 3 - FMS Position
This page shows the FMS system position and all long range
sensors with their position differences expressed in radial nautical
miles from the FMS position.
When the line select key corresponding to one of the sensors is
pressed, that sensor's coordinates and position difference (broken
into N-S and E-W components) are displayed just below the FMS
position. The selected sensor will be displayed in small characters
and the arrow will be removed from the display.
Section II
Control & Display
2-14 2423sv602
Change 1
DATA Page 4 - General Data
This is a general purpose data page. If desired, manual entries may
be made for date, time, and variation. Provisions are also made for
a manual entry of heading data. A manual heading entry would only
be made in the event of failure of all heading inputs. Advisory
information is provided concerning software version numbers and
current aircraft steering commands.
HDG - Displayed within parenthesis is the source of the heading
data being used by the navigation computer. Next to this is the
present aircraft heading. A "T" indicates that this is a true heading.
With the cursor over the HDG entry field, pressing the LIST key will
access a display from which optional heading source selections may
be made. If the heading is input manually, (MAN) will be displayed
(ref: HDG SOURCE Page after this paragraph).
PITCH - Display of analog pitch (degrees) being received from
external Vertical Gyro, IRS or AHRS. “+” is up and “-” is down.
ROLL - Display of analog roll (degrees) being received from external
Vertical Gyro, IRS or AHRS.
VARIATION - The magnetic variation is automatically computed and
displayed between the latitudes of S60 and N73. (MAN), if
displayed, indicates the variation has been manually input.
ROLL CMD- Display of roll steering command being sent from the
navigation computer to the flight guidance system. An "R" indicates
a right roll and an "L" indicates left roll. The digits following the sign
are the number of degrees of bank being commanded.
DATE - The date shown is that corresponding to the date in
Greenwich, England. Input of the date is numerical by Day-Month-
Year; for example, 201092 would be 20th of October 1992.
UTC - Coordinated Universal Time is entered as hours and minutes
　
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