SUPPLEMENT 4
PRIMUS EPIC - FLIGHT
MANAGEMENT SYSTEM
AIRPLANE
F
LIGHT
S4-10 ANAC APPROVED
Page 10 code 01 REVISION 15
Copyright © by Embraer. Refer to cover page for details.
During conventional (non-RNP) terminal and en-route operations and
B-RNAV operations, the degraded FMS may continue to be used for
navigation, provided the crew can confirm FMS guidance data through
other means, such as cross checking VOR and DME raw data.
Perform a cross-comparison of all sensor positions and station
bearing/distance data, and de-select the error-causing sensor, if it is
detected. In the case of B-RNAV, if the FMS is not able to provide
continued guidance, ATC must be notified of the loss of B-RNAV
capability.
During P-RNAV operations or RNP based terminal, en-route, or remote
operations (including RNP-10), the degraded FMS may not be used to
continue operations. If the offside FMS is not available, the pilot must
contact ATC and notify of the inability to continue P-RNAV or RNP
operation.
If conducting a non-RNP instrument approach, discontinue use of the
degraded FMS for approach guidance and select an alternate source
of navigation, if available (VOR, NDB). If an alternate source is not
available or time does not permit, declare missed approach.
If conducting an RNP-0.3 approach, the degraded FMS may not be
used to continue the approach. If the offside FMS is not available,
declare a missed approach.
During conventional remote/oceanic operations, the FMS may continue
to be used for navigation, provided the crew can confirm FMS
guidance data through other means, such as cross checking GPS and
IRS raw data. Perform a cross-comparison of all sensor positions and
de-select the error-causing sensor, if it is detected.
DEAD RECKONING
The DR annunciator is displayed on the PFD when the FMS has been
p
erforming position computations without any sensors for a set time
after a degraded navigation event occurs (DRGAD). The accuracy and
integrity of the FMS guidance data cannot be ensured in this mode.
The pilot should discontinue use of the FMS when in it is in DR mode.
If there is no alternative means of navigation (off-side FMS, VOR, etc.),
the pilot may elect to perform manual position updates to the FMS in
the DR condition, using reference point fly-over techniques, to
minimize the navigation error. In this case, ATC must be notified of the
loss of navigation capability on the airplane.
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