Piper PA-22

SL-176 Piper PA-20/PA-22 Stabilizer Adjusting Mechanism

04/12/2022Univair
Suggestions to alleviate troubles with the stabilizer adjusting mechanism.

SL-186 Piper PA-22 Clearances in Engine Mount and Nose Wheel Steering Mechanism

09/30/2021Univair
Inspecting the clearance between the engine mount and the tail pipe, and the entire nose wheel steering control system, between the nose wheel and the rudder pedals, also be checked for adequate clearances.

SL-187 Piper PA-22 Brake Lever

09/30/2021Univair
Incorporating a new style stop on the brake lever to prevent the brake lever from hitting the gas line.

SL-194 Piper PA-20/PA-22 Sealing of Firewalls

04/12/2022Univair
Instructions for sealing any gaps or holes in the firewalls with non-hardening fireproof putty.

SL-209 Piper PA-20/PA-22 Navigation Light Switch

04/12/2022Univair
Incorporating a heavy duty navigation light switch, Piper part number 484-575, manufactured by the Ohmite Manufacturing Company.

SL-212 Piper PA-22 Nose Wheel Shimmy Dampener

09/30/2021Univair
Information regarding modification of the shimmy dampener to prevent separation between the assembly body and the end plate.

SL-213 Piper Primer Lines

04/12/2022Univair
To prevent excessive wear of the primer line, resulting in fuel leakage and possible cabin fire, it is recommended that primer lines be clamped and/or re-routed per the sketch included with this letter.

SL-214 Piper PA-20/PA-22 Navigation Light Switch

04/12/2022Univair
Update to Service Letter #209.

SL-223 Piper Engine Support Bushings

04/12/2022Univair
Discussion concerning the useful life of the eight rubber engine support bushings, Lycoming part number 60883.

SL-228 Piper Installation of Two Person Safety Belts

04/12/2022Univair
Information concerning the use of safety belts which do not have TSO approval.

SL-233 Piper Fuel Selector Valve

04/12/2022Univair
The new Fuel Selector Valve, part number 11383-04, should be used for all service replacements and all new installations on Piper PA-18, PA-20 and PA-22 airplanes equipped with two wing fuel tanks.

SL-241 Piper PA-22 Cigarette Lighter Malfunction

09/30/2021Univair
Solution for cigarette lighter popping out of its socket after becoming fully heated.

SL-243 Piper PA-22 Engine Mount

09/30/2021Univair
Inspecting the engine mount to determine if there is any evidence of fatigue cracks in the vicinity of the welds at both the firewall and the engine attachment points.

SL-248 Piper PA-22 Auxiliary Fuel Tank

09/30/2021Univair
This letter announces the approval of the eight gallon auxiliary fuel tank installation in the PA-22 "135" and PA-22 "150" airplanes, serials 22-534 and up.

SL-258 Piper PA-22 Fuel Tank Cap

09/30/2021Univair
To aid in the identification of both types (old vs. new) of fuel tank caps for the Piper PA-22 airplanes, we have provided sketches on the reverse side of this letter.

SL-259 Piper RPM Restriction Placard

04/12/2022Univair
The RPM restriction placard is no longer necessary and can be removed from above mentioned airplanes.

SL-260 Piper PA-22 Brake System

09/30/2021Univair
Information for removing the spring from the brake system.

SL-283A Piper Inspection Forms - 100, 500 and 1000 Hour

04/12/2022Univair
To facilitate the inspection of Piper airplanes in the field, the Service Department has made up 100, 500 and 1000 hour inspection forms for Piper PA-18, PA-18A, PA-22, PA-23 and PA-24 models.

SL-324C Piper Exhaust Systems Maintenance and Inspection

04/12/2022Univair
Proper maintenance and inspection procedures of exhaust systems and heat exchangers for the listed models.

SL-329A Piper PA-22 Inspection of Oil Cooler Lines

09/30/2021Univair
Points to remember when conducting routine inspections of the oil cooler lines and fittings.