Just read the following link on Air Facts Journal (USA aviation website)
For those flying sophisticated light singles and twins and who have reservations on the need to keep current on limited panel, the article in Air Facts is a real eye opener. In all cases described the aircraft went in out of control. The part of the article referring to vacuum pump failures and their fatal result is embedded in the main story about airframe failures
Airframe failure: not just V-tails - Air Facts Journal