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Why does my CDI not respond like a VOR when the GPS SEQ switch is set to HOLD?
Unlike a VOR, the CDI scale used on GPS equipment is based on the cross-track distance to the
desired course, not an angular relationship to the destination. Therefore, the CDI deflection on the
GPS will be consistent regardless of the distance to the destination, and will not become less sensitive
when you are further away from the destination.
What is the correct missed approach procedure? How do I select the MAHP?
To comply with TSO specifications, the GNC 300 will not automatically sequence to the missed
approach holding point. The first waypoint in the missed approach procedure will be displayed as
the next approach waypoint when the pilot performs a direct-to AFTER crossing the MAP, which
the pilot may activate when authorized. All published missed approach procedures (including all
course and altitude restrictions) must be flown before activating navigation to the holding point. To
begin the missed approach procedure prior to the MAP, the GPS APR switch must be released from
the ‘ARM’ position to disarm the approach and begin transition of the CDI to the 1.0 nm scale.
To activate navigation to the first missed approach waypoint after crossing the MAP, press
D
,
then
E
. The GNC 300 will provide direct navigation to the holding point. If you do not have
direct clearance to the holding point, set the GPS SEQ switch to the HOLD position until you have
intercepted the inbound course to the holding point.
How do I re-select the same approach or activate a new approach after a missed
approach?
After flying all missed approach procedures, you may reactivate the same approach for another
attempt from the active route page. Once you have been given clearance for another attempt, select
the starting waypoint from the active route list by highlighting the waypoint identifier and pressing
D
, followed by
E
. The GNC 300 will provide direct navigation to the selected waypoint and
rejoin the approach in sequence from that point on. If you have disarmed the previous approach,
remember to set the GPS APR switch to the ‘ARM’ position.
To activate a new approach, you must select the new procedure from the approach
select page. To view the approach select page, press
R
and rotate
O
until the approach
select page appears. Press
C
twice and rotate
O
to highlight the new approach you
want to fly. To activate the new approach, press
E
and select the IAF, if necessary.
SECTION
G
Q&A
5 nm5 nm 5 nm5 nm
2
nm
2
nm
Unlike a VOR, GPS CDI deflection is based
on the actual distance from the desired
course, regardless of how far away you are
from the destination.
300 7/14/98 8:51 AM Page 126