Alert: Engine: Continental; IO-240-B; Engines Shutting Down; ATA 7320

Alert: Engine: Continental; IO-240-B; Engines Shutting Down; ATA 7320

Continental; IO-240-B; Engines Shutting Down; ATA 7320

The Associate Manager, Atlanta Aircraft Certification Office, ACE-115A, submitted the following article. (The article is published as it was received.)

There have been reports of Teledyne Continental Motors (TCM) model IO-240-B engines shutting down or “running rough” when the power is reduced to idle. It should be noted that fuel flows in low horsepower engines are proportionally less than in higher horsepower engines. Therefore, less stability margin exists at low power levels/low fuel flow rates and idle fuel flow stability is more sensitive to variations in maintenance practices. For example, differences in or improperly calibrated gauges can impact fuel flow stability. In most situations, enhanced focus on maintenance practices has resolved the problems, but TCM has also introduced design improvements to address this issue, i.e. to make the engine less sensitive to low fuel flow rates and has issued service documents to address this condition.

TCM has issued Service Bulletin, SB04-4A, and Service Information Letters, SIL04-9 and SIL-05-5, to address the idle stability problem on the IO-240 engine models. In addition, Service Information Directive, SID97-3C, contains procedures and specifications for adjustment of all TCM continuous flow fuel injection systems. These service instructions and other product improvements are listed in SIL05-6, dated February 25, 2005.

The FAA recommends compliance with all TCM service/maintenance documents including those presented in TCM SIL 05-6 when performing maintenance on the IO-240-B engine. Specifically, Service Bulletin SB04-4A, SIL04-9 and SIL05-5 address the idle stability issue discussed above. In addition, SID97-3C, contains procedures and specifications for adjustment of all TCM continuous flow fuel injection systems.

The complete text of TCM SIL 05-6, SB04-4A, SIL04-9, SIL05-5 and SID97-3C and the other documents listed in SIL05-6 are available on the TCM website: www.TCMLINK.com. A free printed copy can be obtained by writing to the TCM Service Department at Teledyne Continental Motors, P.O. Box 90, Mobile, AL 36601 or by calling them at (888) 826-2325.

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