4M Emergencies - Vacuum System and Associated Instruments

Question 0

1. What instruments may be relied upon in the event of a complete vacuum system failure while operating in instrument meteorological conditions?

Answer 0

Turn and Slip/Turn Coordinator—bank information
Magnetic Compass—bank information
Airspeed—pitch information
Altimeter—pitch information
Vertical Speed Indicator—pitch information

Question 1

2. Is there a backup system available if the engine-driven vacuum pump were to fail?

Answer 1

Some general aviation aircraft may be equipped with a backup vacuum system. This system may be electrically driven or could be an engine-driven vacuum pump running in parallel to the primary pump.