Optional equipment includes an alternate static source.
What is alternate static source?
- When the alternate static source is used, the instrument indications should differ as follows: The altimeter will show a higher altitude than the actual altitude, and the airspeed will show a higher speed than the actual airspeed.
- The airspeed will be higher than the actual speed. The altimeter will show a marginally higher altitude.
- Whenever the primary source of static air pressure is unavailable, use the alternate static air source.
- The most important rule to remember when using an alternate static air source is to always consult the owner's manual, POH, or AFM for information and limitations.
- The alternate static air source is simple to test. Activate the system with the appropriate control and monitor the VSI and altimeter for changes. As the lower static air pressure enters the system, the VSI will rise briefly and the altimeter will rise a few feet.
To learn more about alternate static source refer to :
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