EASA SIB CE-08-12R1
Cirrus Design Corporation (CDC) Models SR20 and SR22 airplanes - Possible Failure of a Transient Voltage Suppressor (TVS)
Summary
The Special Airworthiness Information Bulletin SAIB: CE-08-12R1 addresses a potential failure of a transient voltage suppressor (TVS) in Cirrus Design Corporation Models SR20 and SR22 airplanes. This failure may cause loss of NAV/COMM 1 functionality and produce short-term smoke and fumes in the cockpit, increasing pilot workload. The bulletin provides updated service information from Cirrus Design Corporation to mitigate this issue.
What Changed
This revision of SAIB CE-08-12R1 includes new service information from Cirrus Design Corporation, specifically Service Bulletin SB 2X-24-09, which introduces an in-line fuse to the TVS circuit. This modification is designed to cut power to the TVS upon failure, reducing smoke emission duration and improving safety. The bulletin updates previous guidance and informs operators of the latest corrective action.
Why It Matters
This information is critical for operators and maintenance personnel of Cirrus SR20 and SR22 aircraft because a failing TVS can impair navigation and communication systems and create cockpit smoke, potentially distracting pilots. Understanding and implementing the recommended service bulletin reduces operational risks and enhances safety and reliability of the aircraft's electrical systems. Compliance teams should be aware that this is an informational bulletin, not a mandatory airworthiness directive.
What To Do
Operators of Cirrus SR20 and SR22 airplanes should review Cirrus service advisory SA 07-17 for pilot action guidance during a TVS failure. They should also determine if Service Bulletin SB 2X-24-09 applies to their aircraft and incorporate its modifications to install the in-line fuse, thereby limiting smoke in the event of TVS failure. No specific compliance deadline is stated, but timely action is recommended to reduce risk.
Your fleet's weekly compliance brief
AI-summarized regulatory changes, compliance deadlines, and action items — filtered to your aircraft, every Monday.
AI-generated summary from official EASA source document. Always verify against the original.