Document ID: chunk:federal_register_of_legislation:F2005L04061:body:0:p25
Version: federal_register_of_legislation:F2005L04061
Segment Type: other
Provision Reference: 
Character Range: 65572–68490

action by the flight crew after input and verification by the flight crew.

      4.3.3.16 The navigation system must provide the capability for automatic sequencing of fixes.

      4.3.3.17 The navigation system must provide the capability to define a user-defined course to a fix and the pilot must be able to intercept the user-defined course.

      4.3.3.18 The requirements for path steering are:

(a) the system must provide data to enable the generation of command signals for autopilot, flight director or CDI, as applicable; and

(b) in all cases a Path Steering Error (PSE) must be defined at the time of certification, and must meet the requirements of the desired RNP operation in combination with the other system errors; and

(c) during the certification process, crews must demonstrate their ability to operate the aircraft within the specified PSE; and

(d) aircraft type, operating envelope, displays, autopilot performance, and leg transitioning guidance (specifically between arc legs) must be accounted for in the demonstration of PSE compliance; and

(e) a measured value of PSE may be used to monitor system compliance to RNP requirements. For operation on all leg types, this value is the distance to the defined path; and

(f) when assessing cross-track containment compliance, any inaccuracies in the cross-track error computation (for example, resolution) must be included in the Total System Error (TSE) calculation.

      4.3.3.19 The navigation system must provide the following alerting functions:

(a) an annunciation when the manually entered RNP type is larger than the RNP type associated with the current airspace as defined in the navigation database;

(b) the reinstatement of this annunciation with any subsequent reduction of the RNP type;

(c) if approaching RNP airspace from non-RNP airspace — alerting must be enabled when the cross-track to the desired path is not more than half the RNP value and the aircraft has passed the first fix in the RNP airspace.

      4.3.3.20 The navigation database must:

(a) provide access to navigation information in support of the navigation systems reference and flight planning features; and

(b) not be able to be manually modified; and

      Note   This requirement does not preclude the storage of user defined data within the equipment.

(c) allow for data to be recalled from storage and also retain those data in storage; and

(d) provide a means of identifying the navigation database version and valid operating period.

      4.3.3.21 WGS-84 or an equivalent must be used as the earth reference model for error determination. If WGS-84 is not employed, any differences between the selected earth model and the WGS-84 earth model form part of the path definition error. Errors induced by data resolution also form part of the considerations.

Section 4.4 Operational requirements for CASR 91.5010

4.4.1 Navigation equipage