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Aviation Learning Center Document AC 91-75 - Attitude Indicator
Author: Federal Aviation Administration Date: June 2003
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7. Recommendations
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To provide an increased level of safety, the FAA recommends, but does not require, the following:

a. An approved second attitude indicator with a failure warning flag that monitors both gyro revolutions per minute (RPM) and power supply.

b. A primary attitude indicator that has a failure warning flag.

c. A blinking, low-vacuum indicator light located in the pilot's primary field of view.

d. A vacuum gauge located in the pilot's primary field of view.

e. A method to cover failed gyro instruments.

f. The slip/skid indicator should be mounted:

  • (1) Internally in the lower portion of the electric attitude indicator;

  • (2) Externally on the lower bezel of the electric attitude indicator; or

  • (3) On the panel directly underneath the electric attitude indicator.

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