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Aero Precision provides OEM part support for military aircraft operators across more than 20 aircraft

3505786-1 air turbine starter


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Yes,

The main problem is the very small amount of lubrication inside the starter. after a few minutes the starter will fail and will most likely come apart and damage the engine, cut hoses and electrical wires. Of the two that I know of each time resulted in a FIRE light.

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Yes,

The main problem is the very small amount of lubrication inside the starter. after a few minutes the starter will fail and will most likely come apart and damage the engine, cut hoses and electrical wires. Of the two that I know of each time resulted in a FIRE light.

3505786-1 is the part no. for a newer model air turbine starter, older model starter only engages onto the engine when start valve is open and there's bleed air going into the starter, hence damage will occur when start valve is opened in flight and the starter is engaged onto the engine at rpm that is above the limit. is there any new fail safe built into the newer model to prevent this scenario that is not available on the older model?

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3505786-1 is the part no. for a newer model air turbine starter, older model starter only engages onto the engine when start valve is open and there's bleed air going into the starter, hence damage will occur when start valve is opened in flight and the starter is engaged onto the engine at rpm that is above the limit. is there any new fail safe built into the newer model to prevent this scenario that is not available on the older model?

No there is no safe guard in place.

If the start valve is “open†and air is going to the starter the starter will try and engage no matter which part you have installed.

The air turbine drive will try to engage and mesh with the rotating gear attached to the gearbox. If it does not mesh the starter will accelerate to maximum rpm then disintegrate after a minute of two; maybe more maybe less.

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