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The Duncan Download Blog: Business Aviation Advice & Observations

Learjet 35/55: Prevent Premature Starter Armature Failures

Posted by Diane Heiserman on Tue, Jul 02, 2013 @ 07:00 AM

Contributed by Jerry Cable, Accessories Tech Rep

Learjet/Bendix Starter 6608268-6

Our experience has taught us that a commutator and brush reconditioning program will extend the life of your armature and brushes.

Technicians in the Duncan Aviation Accessories shop, recommend a reconditioning program for the Lear/Bendix starter 6608268-6 on Learjet 35/55 aircraft. The reconditioning of the armature commutator and re-seating and re-run on the brushes every 800 hours (maximum) will divert armature commutator damage.

In cases where the armature commutator and brushes are not reconditioned, the commutator will become pitted and burnt from the diminishing electrical connection to the eroded brushes. This armature commutator damage will progress to the point of mica electrical breakdown (mica is an electrical insulation between the armature commutator bars). This mica breakdown is non-reversible in most cases, and the armature must be replaced.

A common symptom that this is occurring would be the engine is slow to spool at engine start.

Accessory Service Expansion

Scheduled to open later this summer, Duncan Aviation will open its newly refurbished Accessories Shop in Lincoln, Nebraska, that will more than double the footprint of its service area. The Accessory department will gain approximately 6,300 square feet of service area, double its work benches and add new tooling and in-house capabilities, including an overhead crane and a new paint booth with curing room.

To read more about the Accessory department expansion and added tooling, read the Spring 2013 Duncan Debrief.

These expansions come in response to customer requests and changing customer needs. As the industry continues to shift toward larger business aircraft, a trend fueled by technological advances and increased globalization, Duncan Aviation’s new expanded shop areas will be able to accommodate the volume of maintenance, modifications and completions work our customers require.

Jerry Cable is an Accessories Tech Rep located at Duncan Aviation’s Lincoln, Nebr., facility. He is a landing gear and accessory components and systems specialist. His aviation career began in 1991.

Tags: Squawk Solution, Parts & Accessories, Maintenance Event Planning, Learjet

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