Applies To Pro Line 4 And Pro Line 21 Flight Management Systems (FMS)

The FAA has issued a Special Airworthiness Information Bulletin (SAIB) to inform owners and operators of an issue that may cause certain versions of the Rockwell Collins Pro Line 4 and Pro Line 21 Flight Management Systems (FMS) to direct the airplane to make a wrong turn direction when deleting a waypoint.

According to the SAIB, in certain configurations, if the crew uses “DELETE” to remove a waypoint in a departure, Standard Terminal Arrival Routes (STAR), or approach, in the referenced devices, it is possible for the FMS to make the longest turn (more 180º of turn) onto the following leg.

This can occur if, for the waypoint being deleted, both of the following are true:

• The following leg is Track-to-Fix (TF), and the database codes a required turn direction for turning onto the TF, and
• After the deletion, the shortest turn is a different direction than when turning from the original, deleted waypoint

The SAIB is applicable to:

• Pro Line 4/21 FMC-3000 versions99 through 3.2
• FMC-4200 versions 97 through 3.2
• FMC-5000 versions 97 through 3.2
• FMC-6000 versions 97 through 3.2

The FAA recommends that aircrews NOT use DELETE selection. Use an alternative method to delete waypoints on the CDU LEGS page. Refer to Rockwell Collins Operators Bulletin OPSB 0057-05R2 for further information.

(Source: FAA. Image from file)

FMI: SAIB