Avidyne IFD540, Pilot'S Manual

Page: 248 / 334

5-20 Navigation
Transitions dropdown menu in the FMS. When an approach is
selected from the FMS drop down list, the Transition dropdown
menu is presented. “Vectors” is the 1
st
choice in the list and if it is
selected, an “Activate Approach” button is presented in the LSK
L4 along the left side of the page. Until the “Activate Approach”
button is pressed, the FMS state right above the FMS leg into the
FAF displays “/ Vectors to Final – Inactive /”. As soon as the
Activate Approach button is pressed, the leg into FAF becomes
active (magenta) and the FMS state right above that leg displays
“/ Vectors to Final /”
NOTE
Displayed Inbound Course
Due to mathematical rounding, it is possible that
course being sent to an EFIS for digital display may
be 1 degree off from the published approach chart.
TIPS AND TECHNIQUES
Discontinuities During Approaches
Before you insert an approach at an airport, the
FMS is being told to fly a leg directly to the airport
(i.e. the reference point) and the legs on the map
reflect that. However, when you insert an approach,
the FMS is being told to fly the legs of the approach
to the airport (actually to the runway) and not fly a
leg to the airport reference point. After the
approach has been entered, you'll notice a
"discontinuity" before the first leg of the approach.
A discontinuity is an indication that the FMS doesn't
know how to get from the leg before the
discontinuity to the leg after. In other words, there's
a gap in the flight plan
.The gap can be closed via a
number of means to include using the L4 LSK hook,
activating a leg of the approach, Direct-To the leg to
the FAF, etc. Verify the system will do as you
expect by examining the depiction on the map.