Embraer EMB145 Operation Manual page 341

GENERAL GUIDANCE
While performing RNP APCH operations, pilots are required to use the
Flight Director and/or Autopilot in lateral navigation mode.
RNP APCH operations require flight crew monitoring of lateral track
deviations on the PFD to ensure the airplane remains within the
bounds defined by the procedure. The lateral scale and CDI are
automatically changed according the current phase of flight as
presented in the following table:
DEVIATION
0
1 dot
2 dots
NOTE: In the PFD display, the phases of flight are identified as
follows:
− Terminal phase is presented as TERM.
− Approach phase is presented as APP.
− Enroute phase is recognized in case neither of these two
denominations is presented.
All pilots are expected to maintain centerlines, as depicted by onboard
lateral deviation indicators and/or flight guidance. For normal
operations, cross-track error/deviation (the difference between the
RNAV system computed path and the airplane position relative to the
path) should be limited to half the navigation accuracy associated with
the procedure (i.e., 0.15 nm for RNP APCH operations).
REVISION 40
AIRPLANE
OPERATIONS
MANUAL
ENROUTE
(nm)
0
2.5
5.0
TERMINAL
(nm)
0
0.5
1.0
1-02-80
SUPPLEMENTARY
PROCEDURES
NAVIGATION
APPROACH
(nm)
0
0.15
0.30
Page Code
11 02