EASA SIB AIR-21-05R1
Cirrus SR22 Aeroplanes - Tornado Alley Turbo, Inc. (STC-installed) Turbocharger Inlet Check Valves
Summary
The Special Airworthiness Information Bulletin SAIB: AIR-21-05R1 is an FAA information bulletin addressing Cirrus SR22 airplanes equipped with Tornado Alley Turbo, Inc. turbonormalizing systems installed under STC SA10588SC. It informs owners and operators about a potential loss of oil pressure caused by failure of the turbocharger oil inlet check valve. The bulletin provides safety information but does not mandate regulatory action.
What Changed
This revision of SAIB AIR-21-05 corrects the identifier of the referenced Tornado Alley Turbo service instructions. It updates guidance for inspecting the turbocharger oil inlet check valve to prevent oil pressure loss due to valve failure. No new airworthiness directives are introduced.
Why It Matters
This bulletin highlights a real-world incident where a Cirrus SR22 experienced a rapid loss of oil pressure due to a sheared turbocharger oil inlet check valve, which could lead to engine damage or emergency landings. Aviation professionals must be aware of proper installation and maintenance practices to ensure continued airworthiness and safe operation of affected aircraft.
What To Do
Operators of Cirrus SR22 airplanes with the Tornado Alley Turbo turbonormalizing system should perform a one-time inspection of the turbocharger oil inlet check valve following Tornado Alley Turbo Service Instructions TAT SI20-01 dated August 6, 2020. This inspection should be done at the earliest opportunity to verify proper installation and prevent oil pressure loss.