[expatpat]

I'd guess the pump. It would be interesting to know if the two AI's each had separate vacuum pumps or if both ran off the same pump, with the other as backup for the first pump. Maybe CN18F knows.

[Dan(9698)]

They are normally connected using check valves so that either can run all the instruments. If one fails, the vacuum from the other assumes the load for everything.

On single engine airplanes such as the T210, they may be equipped with two separate vacuum pumps connected that way also.

Anyone who does a lot of IFR will put in an electric attitude indicator on the left panel for a backup.

After reading the comments about his log book, it is obvious he was over his head.

I would not ride with a pilot who has not logged at least practice IFR in the last month.

Could you go without driving a car for 6 months and then jump into LosAngeles traffic in a race car?