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EIFS Display: 1.0 nm F.S.
CDU Display: XTK (T)
Approach Active:
EFIS Display: 2 degrees to 0.3 nm F.S.
CDU Display: XTK (A)
Enroute Mode:
EFIS Display: 5.0 nm F.S.
CDU Display: XTK (E)
Approach Armed:
EFIS Display: 1.0 nm F.S.
CDU Display: XTK (T)
Enroute Scaling
When the FMS is operating in the enroute mode, the normal CDI
scaling is linear at ± 5.0 nautical miles (e.g., full scale deflection of
the CDI needle indicates a deviation of 5.0 miles from the desired
track, regardless of the aircraft’s distance from the waypoint.
Section V
Operations
5-82 2423sv602
Change 1
Approach Armed Scaling
When 50 miles from the end-of-approach (direct distance to the
runway, not along the flight plan), the “APPR ARM” option becomes
available. This is indicated by the appearance of “APPR ARM ->“
on Line Select Key [3R] on NAV page 1.
Selecting “APPR ARM” increases the CDI scale sensitivity to ± 1.0
nautical miles, which remains until approach is activated.
If an approach is linked into the flight plan and is not yet armed
before reaching 30 nm from the destination, the system will
automatically arm and the CDI scaling will change to 1.0 nm.
Approach Activated Scaling
The Approach mode may be activated automatically or manually.
When the approach mode is active, angular CDI scaling is invoked.
The CDI sensitivity is then ± 2.0 degrees, approximating that of a
normally sited localizer on runway of about 9,000 feet in length. (A
localizer’s course width is normally tailored to produce full scale
deviation at a displacement of 350 feet from centerline at the runway
threshold. The localizer is typically sited about 1,000 feet beyond
the roll-out end of the runway.)
Angular scaling is maintained to the point where full scale CDI
deflection is equal to 0.3 nautical miles. At that point the system
maintains linear scaling at ± 0.3 nautical miles to the end-ofapproach.
This point occurs approximately at the Final Approach
Fix.
Missed Approach Scaling
Upon cancellation of approach mode (press ‘MISSD APPR’ line
select key) to fly the missed approach procedure, HSI deviation will
revert to terminal scaling (i.e. ± 1.0 nm). If a leg change, DTO or
PVOR is performed to a waypoint that is not part of the missed
approach procedure, or PVOR or Hold at any waypoint then scaling
will revert to enroute (± 5.0 nm).
Section V
Operations
2423sv602 5-83
Change 1
Approach Data Base
FMS approaches can only be executed when the approach is
defined in the FMS’s navigation data base. The approach can be
either a published approach, which is included in the Navigation data
base, or an approach entered by the operator in the Pilot data base.
GPS and NDB overlay approaches are included in the subscription
navigation data base and cannot be pilot defined. Pilot data base
approaches can be created either through the FMS or with
Universal’s Off-Line Flight Planning (OFP) software.
A legitimate IFR approach can be constructed in the Pilot Data
Base only if the approach is referenced to approved instrument
approach procedures (i.e., constructed to exactly duplicate the
charted procedure). Runway coordinates and named FAF
waypoint must be retrieved from the Navigation data base.
Some different waypoint naming conventions will be seen when
approaches are examined. The following are examples of enroute,
terminal and approach waypoints:
D235H 8 mile DME ARC waypoint on 235° radial (“H” is 8th
letter)
R-123 DME ARC terminator on 123° radial
TUS Typically a navaid, e.g., the TUS VOR (or NDB)
BASER A pronounceable 5-letter intersection name
TUS45 A 45 DME fix from the TUS VOR
21TRM A 121 DME fix from the TRM VOR
RYNNB An enroute waypoint located at the RYN NDB
(The letters “NB” are appended to the beacon identifier)
Section V
Operations
5-84 2423sv602
Change 1
Approaches may be constructed using enroute waypoints and
navaids, but they will generally contain terminal waypoints as well.
Terminal waypoints are maintained in a data base file associated
with a particular airport. Examples of approach waypoints are:
FF26 Final Approach Fix for Runway 26
OM26 Outer Marker for Runway 26
MM26 Middle Marker for Runway 26
CF26 Final Approach Course Fix for Runway 26 (usually
located on the final approach course about 2 miles
outside the FAF.
RW26 The threshold coordinates (on centerline) of Runway 26
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