Vacuum System Piper Archer III PA-28-181 step by step,

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VACUUM SYSTEM

The vacuum system is designed to operate the air driven gyro instruments. This includes the directional and attitude gyros when installed. The system consists of an engine driven vacuum pump, a vacuum regulator, a filterand the necessary plumbing.

The vacuum pump is a dry type pump which eliminates the need for an air/oil separator and its plumbing. A shear drive protects the pump from damage. If the drive shears, the gyros will become inoperative.

The vacuum gauge, mounted on the left instrument panel. provides valuable information to the pilot about the operation of the vacuum system. A decrease in pressure in a system that has remained constant over an extended period may indicate a dirty filter, dirty screens, possibly a sticking vacuum regulator or leak in system (a low vacuum indicator light is provided in the annunciator panel). Zero pressure would indicate a sheared pump drive, defective pump, possibly a defective gauge or collapsed line. In the event of any gauge variation from the norm, the pilot should have a mechanic check the system to prevent possible damage to the system components or eventual failure of the system.

A vacuum regulator is provided in the system to protect the gyros. The valve is set so the normal vacuum reads 4.8 to 5.2 inches of mercury, a setting which provides sufficient vacuum to operate all the gyros at their rated RPM. Higher settings will damage the gyros and with a low setting the gyros will be unreliable. The regulator is located behind the instrument panel and is accessible from below the instrument panel.

👉 PIPER ARCHER III PA 28-181 HANDBOOK

👉 PREFLIGHT INSPECTION

👉 MISCELLANEOUS

👉 BEFORE STARTING ENGINE

👉 NORMAL START - COLD ENGINE

👉 NORMAL START - HOT ENGINE

👉 ENGINE START WHEN FLOODED

👉 STARTING WITH EXTERNAL POWER

👉 WARM-UP

👉 TAXIING

👉 GROUND CHECK

👉 BEFORE TAKEOFF