Document ID: chunk:federal_register_of_legislation:F2005L04061:body:0:p23
Version: federal_register_of_legislation:F2005L04061
Segment Type: other
Provision Reference: 
Character Range: 60262–63145

as a magnetic course, the source of the magnetic variation needed to convert magnetic courses to true courses is required.

      4.3.3.10 The system requirements for a parallel offset are:

(a) the capability to fly parallel tracks at a selected offset distance; and

(b) when executing a parallel offset, the RNP type and all performance requirements of the original route in the active flight plan are applicable to the offset route; and

(c) provision for entry of offset distances in increments of 1 NM, left or right of course; and

(d) capability for offsets of at least 20 NM; and

(e) a clear indication to the flight crew that the system offset mode is in use; and

(f) when in offset mode, the provision of reference parameters (eg cross-track deviation, distance-to-go, time-to-go) relative to the offset path and offset reference points; and

(g) prevention of an offset being propagated through route discontinuities, unreasonable path geometries or beyond the initial approach fix; and

(h) the flight crew must be given an annunciation before the end of the offset path, with sufficient time to return to the original path; and

(i) when a parallel offset is activated, the offset must remain active for all flight plan route segments until removed automatically, the flight crew enters a Direct-To routing or manually cancelled by the flight crew; and

(j) the parallel offset function must be available for en-route TF and geodesic portion of DF leg types.

      4.3.3.11 The fly-by transition criteria are:

(a) no predictable and repeatable path is specified, because the optimum path varies with airspeed and bank angle; and

(b) predictable and repeatable boundaries of the transition area are defined; and

(c) if the path lies within the transition area, there is no PDE; and

(d) a fly-by transition is the default transition when the transition type is not specified; and

(e) the theoretical transition area requirements are applicable for the following assumptions:

 (i) course changes do not exceed 120° for low altitude transitions (when the aircraft barometric altitude is less than FL 195); and

 (ii) course changes do not exceed 70° for high altitude transitions (when the aircraft barometric altitude is at least FL 195).

      4.3.3.12 A user interface display must provide for the presentation of information and situational awareness and be designed and implemented to accommodate human factors considerations.

      4.3.3.13 The following matters must be considered in user interface display design:

(a) minimising reliance on flight crew memory for any system operating procedure or task;

(b) developing a clear and unambiguous display of system modes or sub-modes and navigational data with emphasis on enhanced situational awareness requirements for any automatic mode changes if provided;

(c) use of context sensitive help capability