Piper Arrow IV Turbo Maintenance Manual page 91

SERVICE INSTRUCTIONS. (Cleaning and Inspection)
1. The filter should be cleaned daily when operating in dusty conditions and if any holes or tears are
noticed, the filter should be replaced immediately. For replacement filter, refer to Parts Catalog.
2. Remove the filter element and shake off loose dirt by tapping on a hard surface, being careful not to
damage or crease the sealing ends.
Never wash the filter element in any liquid or soak in oil. Never
attempt to blow off dirt with compressed air.
3. The filter housing can be cleaned by wiping with a clean cloth soaked in suitable quick drying type
solvent. When the housing is dry, reinstall in accordance with Installation of Air Filter.
INSTALLATION OF AIR FILTER.
After cleaning and inspection, install the filter element and cover in reverse order of removal instructions.
ALTERNATE AIR DOOR.
On the PA-28RT-201T the alternate air door is located in the alternate air box to provide a source of air to
the engine should there be an air stoppage through the filter system. The following should be checked during
inspection:
1. Check that air door seals are tight and the hinge and torsion spring are secure.
2. Adjust the control cable to position the roller on the arm assembly clear of the door in the closed
position. Check that when the cockpit control is in the closed position the door is properly seated in the closed
position.
3. Actuate the door by operating the control lever in the cockpit to determine that it is not sticking or
binding.
4. Check the cockpit control cable for free travel.
On the PA-28RT-201 the alternate air door is located in the induction bracket mounted on the fuel injector.
The door provides a source of air to the engine should there be an air stoppage through the filter system. The
following should be checked during inspection:
1. Check that air door seals are tight and hinge is secure.
2. Ascertain that the spring tension of the door is tight enough to allow the door to remain closed at full
engine RPM, yet should there be an air stoppage, it will be drawn open.
3. Actuate the door by pushing in on it with the fingers to determine that it is not sticking or binding.
4. Check the cockpit control cable for free travel.
5. Check that when the control lever in the cockpit is in the open position, the cable is adjusted to allow
approximately .0625 to .125 of an inch between the actuating arm roller and the door when fully closed.
PIPER AIRCRAFT
PA-28RT-201 / 201T
*MAINTENANCE MANUAL
—CAUTION—
1D19
12-20-19
Page 12-12
December 1, 1978