TFE731 Winter 2005

• Pre-Buy Evaluations and MSP
• Carbon Seal Health Check for -20/40/60 Engines

Pre-Buy evaluations and MSP

— Doug Alleman

Honeywell has clarified the inspection required to transfer an MSP contract to a new owner on a TFE731 powered aircraft. As a condition of transfer, MSP recommends a visual inspection of the inlet and tailpipe completed by a Honeywell Authorized Service Center. The Service Center is to complete a logbook entry stating the visual inspection was completed. The cost of this inspection is the responsibility of the owner/operator.

If an owner/operator decides to do a more comprehensive inspection, they accept all charges. This includes all costs to perform 5pts, vibration surveys, gearbox pressure checks, borescopes etc., all which are unnecessary to transfer a MSP contract. If the owner/operator elects to perform an expanded pre-buy workscope, and a problem is discovered, MSP will financially participate in the cost of this “unscheduled maintenance.” This is described in your MSP contract, under all terms of the contract regarding coverage, providing the following conditions are met:

1. Honeywell is contacted and notified of the problem along with date and service center performing the pre-buy evaluation with enough reasonable notice to allow a technical representative be present during the inspection, if desired.
2. Honeywell has the opportunity to have a technical representative present during the inspection to oversee the expanded workscope.
3. Honeywell is given the opportunity to re-inspect the engine independently of the pre-buy evaluation and direct the maintenance workscope to be followed.

To receive any financial coverage on the repairs for unscheduled maintenance, it is an absolute requirement that prior notification is received from Honeywell. An Owner/operator or service center performing unscheduled maintenance found during a pre-buy, without Honeywell’s prior notification, will be solely responsible for all related costs to the repairs.

If you are in the process of purchasing an aircraft with engines on MSP and wish to transfer the contract, contact MSP. They will send you a transfer packet and a letter stating an engine inspection and evaluation is not required to transfer the contract to the new owner.

The letter issued by Honeywell addressing pre-buy evaluations on MSP engines can be found on www.e-engines.honeywell.com. under TFE731 communications.

Carbon Seal Health Check for -20/40/60 Engines

— Doug Alleman

Honeywell has released temporary revisions to the TFE731-20/40/60 Light Maintenance Manual. These revisions require a health check of the main line carbon seals at periodic inspection intervals.

The health check required by these temporary revisions shall be complied with by performing pressure checks of the accessory, fan and transfer gearboxes.

Regardless of engine model, if your engine is pre SB 72-5147 you will perform gearbox pressure checks every 300 hours with a 50-hour overrun allowance.

Post SB 72-5147 engines installed on the Lear 45, Falcon 50EX and Falcon 900EX, will require gearbox pressure checks every 600 hours with a 50 hour overrun allowance. Post SB72-5147 engines installed on the G-100 will require gearbox pressure checks every 500 hours with a 50-hour overrun allowance.

Temporary revision 72-177 includes table 812 to record the gearbox pressures obtained during the run and figure 801 to plot your gearbox pressures against the time on the seals to determine the health of the seals. TR72-177 also includes a number to fax your completed forms, 812 and 801, to Honeywell Customer Service Engineering.

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