AIRPLANE
FLIGHT
SUPPLEMENT 4
PRIMUS EPIC - FLIGHT
MANAGEMENT SYSTEM
ANAC APPROVED S4-10
REVISION 15 code 01 Page 13
Copyright © by Embraer. Refer to cover page for details.
2) The default RNP value for Approach is:
- 0.3 for airplanes equipped with Load version prior to
Load 25.3 (Pre-Mod. SB 170-31-0051) or prior to
Load 25.4 (Pre-Mod. SB 170-31-0047), performing any
approach using FMS;
- 0.5 for airplanes equipped with Load 25.3 (Post-Mod.
SB 170-31-0051), Load 25.4 and on (Post-Mod. SB
170-31-0047) or with an equivalent modification factory
incorporated, performing radio-based approach. For
RNAV approaches the default value remains 0.3.
The default RNP values above do not constitute airworthiness or
operational approval for the respective RNP types. Refer to
NAVIGATION OPERATIONAL APPROVALS for the FMS RNP
capabilities.
When the FMS is selected as the navigation source on the PFD, the
scale of the CDI will be based on the displayed active RNP value. The
two-dot, full-scale deflection of the CDI will always be equal to the RNP
value (1xRNP) displayed on the PFD.
The FMS does not provide an indication to the crew of an excessive
lateral (cross-track) deviation. Lateral deviation is not considered in the
display of the RNP integrity alert. It is the pilot’s responsibility to
monitor lateral deviation, and take appropriate action to ensure the
airplane follows the flight plan with minimal error.
The steering sources required for each RNP type assume worst case
position determination by the FMS. Regardless of the sensors in use,
the RNP integrity alert will always be provided at any time the current
position determination mode of the FMS does not yield satisfactory
accuracy and integrity to satisfy the containment requirements for the
active RNP type.
GPS mode is given the highest priority for position determination, when
GPS HIL is within limits. If GPS is not available, the FMS will utilize
radio modes (DME-DME or VOR-DME) if they provide satisfactory
accuracy. If radio modes are not available, the FMS will use IRS data.
The FMS computes an Estimate of Position Uncertainty (EPU), which
is displayed with the current position determination mode on the
PROGRESS page on the MCDU.
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