TFE731 Summer 2007

• Revised Inspection Intervals for TFE731-20/40/60 Engines
• Honeywell Engine and APU Damaged Engines and Low Utilization

Revised Inspection Intervals for TFE731-20/40/60 Engines

— Doug Alleman & Mike Healzer

Honeywell has revised the Light Maintenance Manual to allow operators of the TFE731-20/40/60 engines to increase the Major Periodic Inspection (MPI) interval from 2,500 hours to 3,000 hours and increase the Compressor Zone Inspection (CZI) interval from 5,000 to 6,000 hours if certain Service Bulletins have been performed. See chapter 5-20-00 Scheduled Maintenance Checks, Table 801, page 805, revision date May 15/07 for details.

Honeywell has also revised chapter 72-00-00 Routine Periodic Inspection intervals to aid in lining up these engine ispections with airframe inspections. The inspections should be performed at the recommended intervals and not exceed the range of operating hours specified. See chapter 72-00-00 Engine/Inspection Check/Scheduled Inspections, starting on page 805 for the revised intervals.

For more information, please call Duncan Aviation’s in house engine tech reps Lanny Renshaw at 800.228.4277, ext 4262, or Ken Kuchenreuther at 800.525.2376, ext 8486.

Honeywell Engine and APU Damaged Engines and Low Utilization

— Jon Dodson

The FAA approved engine Light Maintenance Manual (LMM) defines Damaged Engines as “engines involved in an accident or incident.” It is also defined as an engine damaged in service for which there is no current inspection/repair procedure set forth in the manuals. In addition, engines missing a data plate are considered as Damaged Engines. Honeywell has an established (DEL) Damaged Engine List that is used as an aid in researching the operational history of the TFE731 engines.

If you are a Low Utilization operator for six months or less and you want to keep your engines off this list, you are advised to rotate your engines (observing starter limitations) once a month until N1 indication is achieved and make a log book entry. If your engines will be dormant for more than six months, then you will need to follow the preservation procedures in the manual. We will provide more information on that in the next issue.

Honeywell has a Damaged Engine Review Board for the purpose of establishing Inspection Repair Workscopes (IRW), when requested for those engines whose serial numbers appear on the DEL. Engines covered by MSP or other maintenance/warranty contracts that are involved in an accident/incident or are otherwise classified a Damaged Engine must comply with the DERB IRW in order to have the maintenance/warranty contract re-instituted. The DEL is updated continuously as new information becomes available and for that reason cannot be published to the field in hard copy form.

If you have information that a propulsion engine or APU has been damaged in an accident or incident, Honeywell requests you contact a Field Service Engineer (FSE) to report that information and receive instructions on the repair disposition of the engine. For contact information on your local FSE, visit www.e-engines.honeywell.com and look in the Customer Support Section, or contact Honeywell at 800.601.3099 or 602.365.3099.

For more information or to obtain status on a damaged engine, contact your Honeywell Authorized Service Center (Duncan Aviation). As an ASC, we have access to the information on damaged engines and are able to provide more detail on the actual workscope and findings on the subject engines. The completeness and accuracy of this data is greatly dependent upon information sources such as yourself. We offer thanks for your continued support of this process.

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