EASA SIB NE-09-04: Precision Airmotive Fuel Injection Servos

What to do

Maintenance personnel should inspect the hex plugs on affected Precision Airmotive and Bendix RSA-5 and RSA-10 series fuel injection servos during each normal annual inspection. If a hex plug is found loose, replace the gasket with part number 2577258 and apply increased installation torque following Precision Airmotive Service Information Letter SIL RS-88. Loose plugs should be reported to the FAA contact provided in the bulletin. No immediate mandatory compliance deadline is specified.

Summary

The Special Airworthiness Information Bulletin SAIB NE-09-04 is an FAA informational bulletin addressing potential loose hex plugs in Precision Airmotive LLC RSA-5 and RSA-10 series, and Bendix RSA-5 and RSA-10 series fuel injection servos. These servos are installed on various fuel-injected Lycoming engines, Teledyne Continental Motors LTSIO-360-RB and TSIO-360-RB engines, and Superior Air Parts IO-360 series engines. The bulletin alerts maintenance personnel to inspect for looseness of brass hex plugs, part number 383493, on servos shipped or repaired before August 22, 2006 without a letter "G" marking on the plug.

What changed

This bulletin introduces a recommendation for routine inspection of the specified fuel injection servos for loose hex plugs during normal annual inspections. It clarifies that while no unsafe condition warranting an airworthiness directive has been identified, loose plugs may cause engine power loss. The bulletin also references previous emergency ADs related to defective gaskets and advises on corrective actions if looseness is found.

Why it matters

This information is important for aviation maintenance professionals and operators because a loose hex plug in the fuel injection servo can lead to improper fuel flow scheduling and engine power loss, potentially affecting flight safety. Early detection and corrective maintenance help prevent in-flight engine issues and ensure continued airworthiness of affected engines. It also assists compliance teams in understanding the current regulatory stance and recommended practices.