FAA Issues Emergency ADs for Thielert, Precision Airmotive

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The FAA yesterday issued two emergency airworthiness directives affecting general aviation aircraft. The first, (AD 2008-06-52), applies to Thielert Aircraft Engines GmbH (TAE) model TAE 125-02-99 engines with a serial number from 02-02-1500 through 02-02-2279. Although the AD only mentions installations on some Cessna 172 and (Reims-built) F172 series (STC No. SA01303WI) airplanes and Diamond DA42 airplanes, Thielert's Sebastian Wentzler told AVweb that some DA40 and Piper PA28s also have the affected engines. Only 2.0 liter engines are affected and they're in a total of 507 aircraft. Thielert is paying for the fix, which Wentzler said should take only an hour and involves installation of a new bracket on a fuel line. The FAA says it received reports of in-flight engine shutdown incidents that were found to be the result of a cracked high-pressure fuel line between the high-pressure pump and fuel rail. These cracks were caused by excessive vibration of the fuel line and, if not corrected, could result in an in-flight engine shutdown or engine fire. The second AD (2008-06-51) addresses a problem with certain Precision Airmotive LLC RSA-5 and RSA-10 series fuel injection servos.

AVweb reported last week that two incidents relating to RSA-10ED1 fuel-injection servos on Lycoming IO-540-K engines in Piper Saratoga/6X aircraft led Precision Airmotive to issue a mandatory service bulletin on March 6 calling for inspection and replacement of defective parts.