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Page APV4-37
NOTE:
The instrument approach procedures associated with RNP APCH are entitled
RNAV (GNSS) to reflect that GNSS
is
the primary navigation system. With the inherent
onboard performance monitoring and alerting provided by GNSS, the navigation specifica-
tion qualifies as RNP, however these procedures pre-date PBN,
so
the chart name has re-
mained as RNAV.
Missed
approach
procedures
Before commencing an RNAV (GNSS) missed approach, a MAP should be possible with-
out reference to GPS derived navigation
so
that,
in
the event
of
a loss
of
GPS accuracy
or
loss
of
integrity during the approach, a safe return to above Minimum Sector Altitude can be
made.
This may be possible by dead reckoning (DR) navigation but where this is not possible
and the MAP requires reference
to
terrestrial navigation aids, these must be available,
tuned and correctly identified before passing the IAF and remain available throughout
the approach.
Reasons for a missed approach are many and
if
GPS information remains available for the
MAP, the pilot must be able
to
sequence the system correctly past the MAP,
in
order to
follow the published MAP correctly.
Pilots should be fully competent in the necessary selection routines required by their own
equipment, in order to transition to the MAP and preserve accurate navigation throughout.
When GPS navigation
is
NOT available for the MAP,
it
may be necessary to reset the dis-
play function
of
the HSl/CDI to disengage GPS information and regain VOR/LOC display.
Pilots must be fully conversant with navigation display selections
in
order safely
to
follow
the MAP.
Abnormal
procedures
for
approaches
As the aircraft approaches the FAF (LNAV Only, without SBAS), the receiver automatically
perform a final RAIM prediction for the approach. The receiver will not enter the ap-
proach mode
if
this RAIM prediction
is
negative. In this case, the approach should be dis-
continued.
However, this RAIM check assumes availability
of
the full constellation and will not take
account
of
scheduled interruptions or failures. This can lead to a successful RAIM prediction
at this point when the RAIM function itself
is
not available.
If
RAIM
is
lost after passing the FAF the equipment should continue
to
provide naviga-
tion, where possible for five minutes, before giving a RAIM loss indication and this should
be enough to complete the approach.
Should RAIM detect
an
out
of
tolerance situation, a warning will be given and a missed
approach should be initiated immediately
Section
4 -
Normal
procedures
ADDITIONAL GUIDANCE FOR RNAV
GPS
Ed.
2,
Rev.O
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