What device provides static pressure to the standby airspeed indicator and altimeter?

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The standby airspeed indicator and altimeter require a source of static pressure for their operation, and this is typically provided through separate alternate static ports. These ports ensure that if the primary static system becomes inoperative or is affected by blockages—such as in icing conditions—there is an alternative source to provide accurate pressure readings necessary for airspeed and altitude measurements.

Using separate alternate static ports helps maintain redundancy in the system, which is critical for safety, allowing pilots to still receive vital flight information even if they encounter issues with the primary static system. This redundancy is essential in aviation, where reliability and accuracy of instruments directly affect flight safety.

Other devices, such as the elevator control or the mach indicator, do not supply static pressure to the airspeed indicator or altimeter. The icing system is not related to providing static pressure; instead, it is concerned with mitigating ice formation on critical surfaces and controls, which can impair control and performance.

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