# SAIB CE-19-10: Navigation: Flight Management Computing Software

- Type: Special airworthiness information bulletin (advisory, not mandatory)
- Status: Current
- Revision: 0
- Issued: June 10, 2019
- Products: Rockwell Collins Pro Line 4 Flight Management Systems and Pro Line 21 Flight Management Systems
- Product type: Appliance
- PDF: https://openairdocs.org/files/sha256/92/1d/921d5961691266cbe89350b73548cb445e5ac8d6e24e95fe4131847a3e67e996
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/72CD8844E1E925A58625841500702BB0.0001
- DRS record last changed: June 10, 2019
- Page: https://openairdocs.org/saib/CE-19-10

## Text

FAA Aviation Safety

**SPECIAL AIRWORTHINESS**

INFORMATION BULLETIN SUBJ: Navigation: Flight Management Computing Software SAIB: CE-19-10 Date: June 10, 2019 This is information only. Recommendations aren’t mandatory.

Introduction

This Special Airworthiness Information Bulletin is to inform owners and operators of an issue that may cause certain types 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.

Pro Line 4/21 Equipment Type Versions FMC-3000 99 through 3.2 FMC-4200 97 through 3.2 FMC-5000 97 through 3.2 FMC-6000 97 through 3.2

At this time, the airworthiness concern is not an unsafe condition that would warrant airworthiness directive (AD) action under Title 14 of the Code of Federal Regulations (14 CFR) part 39.

Background

In the above referenced configurations, if the crew uses “DELETE” to remove a waypoint in a departure, Standard Terminal Arrival Routes (STAR), or approach, 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

This potentially can occur in procedures with a turn in either direction, left or right.

Recommendations

The FAA recommends to 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.

For Further Information Contact Avi Acharya, Aerospace Engineer, 1801 Airport Road, Suite 100, Wichita KS 67209; phone: (316) 946-4192; fax: (316) 946-4107; e-mail: avishek.acharya@faa.gov

2 For Related Service Information Contact Collins Aerospace, 400 Collins Road NE, Cedar Rapids, IA 52498 ; phone: (319) 295-5000.

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