Cirrus DESIGN SR20 Information Manual page 69

Cirrus Design
SR20
Vacuum System Failure
Failure of the engine driven vacuum pump is indicated by illumination
of the red VACUUM warning light. If the engine driven vacuum pump
fails, the electric standby vacuum pump will automatically energize
and the amber AUX VAC caution light will illuminate indicating that the
electric pump is operating and supplying vacuum for instrument
operation.
In the event both vacuum pumps fail in flight, the attitude gyro,
directional gyro (if installed) or optional vacuum operated HSI (if
installed) will be inoperative. The optional electric powered HSI (if
installed) is unaffected by a vacuum system failure. The remaining
gyroscopic instrument will be the electric turn coordinator. The
autopilot uses the turn coordinator gyro for roll attitude information.
1. Consider using the autopilot roll axis to reduce workload. Engage
stabilizer (ST) mode if available. If optional electric HSI is installed,
use HDG mode to help maintain wings level - set HDG bug to the
current airplane heading before engaging autopilot.
Do not use HDG mode if airplane is equipped with a vacuum
powered directional gyro or vacuum powered HSI.
2. Rely upon "partial panel" techniques while in instrument
conditions. Cover inoperative instruments if possible.
3. Endeavor to fly to visual conditions as soon as possible.
P/N 13999-002 Info Manual
September 2011
• WARNING •
Section 3
Emergency Procedures
3-27