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Operations
RAIM
says RAIM will be available, it actually means that it will be available
at your predicted time of arrival and plus and minus 15 minutes from
your arrival time calculated at 5 minute intervals.
RAIM prediction is required to be done automatically by the
equipment for the estimated time of arrival at the FAF and the MAP
when you are 3 nm inbound to the FAF. On your Apollo NMS, the
system will not go to the approach active state at the FAF and the
Approach Active annunciator will not come on if approach RAIM is
not available or if it has been predicted to become unavailable while
you are between the FAF and the MAP.
TSO C129a requires the RAIM alarm limit to be at least 2.0 nm for en
route operations, 1.0 nm for Terminal operations, and 0.3 nm for
Approach operations.
What are En Route, Terminal, and Approach Operations?
Approach RAIM, or 0.3 nm alarm limit, is provided from 2.0 nm
inbound to the FAF until you cancel the Approach Active operation
(usually at the MAP). Approach RAIM is provided only if an approach
is loaded into your active flight plan and it is enabled.
Terminal RAIM, or 1.0 nm alarm limit is provided within 30 nm of
your departure and your destination airport (except when Approach
RAIM is provided). This is automatic and requires no pilot action. For
those of you who are familiar with the traditional definition of
Terminal, which was the ability to operate on SIDs and STARs that are
only 4 nm wide, the term Terminal has been "redefined" in TSO C129a
to mean within 30 nm of your departure or destination.
En route RAIM, or a 2.0 nm alarm limit is provided at all other times.
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