A friend has one of these, so I've dabbled, but not dug deep into a Rescue 911. I "think" there is a home switch that should tell the motor to shut off when it is in the home position. My first guess is that switch is perhaps faulty or a wire has broken loose from it causing it not to register. Could also be an alignment issue with said switch.

The above post is correct. You can check that switch in the diagnostic. The helicopter is tough to get working perfect, but it’s really a nice feature when it works properly.

There are optos at the start and stop positions.

They are under the plastic buildings and are triggered by the rectangular piece of metal on the shaft for the helicopter.

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Simply reflow the solder pads and that will most likely take care of it.

Sometimes the LEDs break off at the end of the bulb, so reflowing isn't always a sure thing. Also, sometimes the LEDs are too dim or just fail.

Could be as simple as windex on a qtip to clean the opto. Keep us posted, OP.

Quick question since were on the subject. My helicopter works flawlessly when I have a single ball on the play field. When I'm have more than one ball the helicopter will drop the ball its taking back home as soon as the other one hits a bumper anywhere in the play field or you use a flipper. Then the helicopter will stay parked where ever it dropped the ball and not return home. No wires are broken under the playfield as far as I can see and the wire to the helicopter is not getting snagged anywhere. Any ideas? Thanks a ton

I would start by looking at active switches. See if anything is active that shouldn't be. I would test the optos to make sure they register the helicopter in the up and down position.