SAIB CE-06-07 —

CE-06-07 November 4, 2005 http://www.faa.gov/aircraft/safety/alerts/SAIB This is information only. Recommendations aren’t mandatory.

Introduction

This Special Airworthiness Information Bulletin (SAIB) advises you, registered owners and operators of Cirrus Design Corporation (CDC) SR20 and SR22 airplanes equipped with Avidyne Primary Flight Displays (PFDs), of possible misleading pitch, roll, and heading information.

Background

Avidyne has received several field reports of PFDs displaying incorrect attitude and heading information. These occurrences were accompanied by a “CROSSCHECK ATTITUDE” alert annunciation within approximately 45 seconds after initiation of the condition.

Discussion

Cirrus has issued the attached Owner Service Advisory No. SA 05-05, dated October 20, 2005, which references “Avidyne’s Service Alert SA-05-001 – Primary Flight display (PFD)” (also attached). Both recommend increased attention to standard and emergency operating procedures when flying in Instrument Metrological Conditions (IMC). The most significant procedures are: • Requirement to have a working backup attitude indicator • Performance of a full instrument scan including the backup indicators with frequent instrument cross checking procedures • Currency on partial or emergency panel attitude control • Use of autopilot in the NAV/GPS or NAV/GPSS modes.

Avidyne is trying to find the cause of the problem. This SAIB is an interim airworthiness action until we can fully understand this issue. We may take further airworthiness action in the future.

Recommendation

We recommend you review both the Cirrus and Avidyne documents and use the recommended procedures.

Cirrus Owner Advisory No. SA 05-04 may be read or printed from www.cirrusdesign.com under “Service & Upgrades” – Service Publications”.

For Further Information Contact

Wesley Rouse, Aerospace Engineer, FAA Chicago Aircraft Certification, 2300 E. Devon, Des Plaines, IL 60018; phone: (847) 294- 8113; email: [email protected]