Remove filter cover plate PN 650029-000 from the cowl. Step 2:
Unscrew the existing filter PN 13219 and discard.Step 3:
Inspect flex duct and heat box for condition making sure valve shaft and bushing is not worn. If un-airworthy, repair or replace worn carburetor heat box. Step 4:
Make sure flex duct is in position in front of the cowl opening and with the holes aligned. Screw the frame in place with 4 ea. MS35206-246 screws. Select a Phillips screw driver of a small enough diameter to slip through the four holes in the front of the frame.Step 5:
Install filter element PN BA-6108, making sure the taper of element is the same as the taper of the frame and contact is being made on all sides. Step 6:
Install grill with the 2 legs under the frame and the cross bars facing out. Align the piano hinges and insert safety pin making sure it is in the locked position.Step 7:
Re-install cover plate on the cowl.Step 8:
For all future element replacements, only remove safety pin and grill, then remove and replace element PN BA-6108.Step 9:
NOTE: After initial installation of filter assembly, fill out FAA Form 337 for return to service. On future replacement of parts this form will not be required.
Servicing: Under normal conditions, replace filter element, PN BA-6108 after 200 hours use or 1 year intervals. Under severely dusty conditions, check daily and replace when element is 50% covered with foreign material. For Continued Airworthiness Instructions, see Form I-194.