I have a plane with an Eflite 32, Igor active timer, Jet spin 66, and 6s 2600 Zippy battery and I crashed.  It died on a pullup, probably due to an old weak battery, and went straight into the concrete.

The motor was toast.  Timer and ESC physically looked fine.  Rebuilt frontend and replaced motor, another E32.  I figure the components saw about 148 gs on impact.

After reassembly, the system flies for about a minute or so at normal speed and then drops down to about 50% power for about a half a minute and cycles like this for the timer duration.

I traded out the ESC with another 66 and it did essentially the same thing.

Could timer be damaged? although it programs fine and starts and runs the motor.

Could accel. be damaged and cause something like this.

Could failure to do recalibration run cause this?

Can I power timer with 5v supply and send output to oscilloscope to watch pulses?

Its a little Jack-in-the-Box car antenna head.  He survived, although his eyes are a little bloodshot.

Yes, yes but probably not, maybe but I doubt it, and yes.

But Christ's suggestion is probably the best.

It's unlikely that a damaged timer would cause such structured difficulties.  Ditto a damaged accelerometer.  I'm guessing at how Igor's timer works, but I wouldn't expect this bad of problems from a lack of calibration.

And yes, you can run it off of 5V and look at it with an O-scope.  It's kind of interesting to do that and wave the accelerometer around.

Thanks to all of you for your prompt inputs ....
I think Igor hit it.  (I was hoping you would see this post and input)

After close inspection last night, .... I found that the connection between the timer and the ESC (wire on ESC side of connection) had suffered an impact of some kind in the 148G landing.  The brown wire had been hit by something and smashed.  I don't know why I didn't see it as I reassembled the parts, but I'm getting old and it was a very small nick. 

The only thing loose in that compartment was the ferrite ring.  I examined the smashed wire with a "jewelers loupe"  and saw that the majority of the little copper wires on the brown line were cut but maybe just one of two strands might have been intact in the center.  This very closely matches Igor's scenario.  I put the copper back into a cohesive lump and put a drop of solder on it for a quick test today.  I'll report the results.

After reassembly, the system flies for about a minute or so at normal speed and then drops down to about 50% power for about a half a minute and cycles like this...

Frank, we can’t hear you when you make that sound.

Wait.  Maybe it’s because I didn’t know that there is sound on Stunthangar.  How do you turn it on?