This Special Airworthiness Information Bulletin (SAIB) communicates an airworthiness concern to all owners and operators of reciprocating engine-powered airplanes that use an exhaust system heat exchanger for cabin heat. This revision clarifies the airworthiness concern is for aircraft that use an exhaust system heat exchanger for cabin heat.

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

Click here to read the full FAA Special Airworthiness Information Bulletin, SAIB CE10-33R-1.