Piper PA-18

SL-210 Piper PA-18A Agricultural Plane Operating Limits

09/29/2021Univair
Concerns about some of the operational conditions which exist with the PA-18A agricultural airplane.

SL-213 Piper Primer Lines

09/29/2021Univair
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-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-233 Piper Fuel Selector Valve

09/29/2021Univair
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-242A Piper PA-18A Special Air Filter Kits

09/29/2021Univair
Incorporating a new air filter installation which takes carburetor air from the top of the engine cowl instead of the bottom, thereby reducing the amount of sand and dirt that can enter the engine.

SL-247 Piper Tail Reinforcement for PA-18 Agricultural Airplanes

09/29/2021Univair
Reinforcing the bottom longeron on PA-18A airplanes to prevent bends caused by certain load conditions or maneuver types.

SL-259 Piper RPM Restriction Placard

09/29/2021Univair
The RPM restriction placard is no longer necessary and can be removed from above mentioned airplanes.

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

09/29/2021Univair
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-318 Piper PA-18/18A Carburetor Air Filter System Maintenance

09/29/2021Univair
Availability of a modification kit to incorporate the latest type carburetor air filter system on the aircraft models listed above.

SL-324C Piper Exhaust Systems Maintenance and Inspection

09/29/2021Univair
Proper maintenance and inspection procedures of exhaust systems and heat exchangers for the listed models.

SL-349 Piper Adjustment of Engine Support Bushings

09/29/2021Univair
Per Lycoming Division of Avco Corporation, it is permissible to use a torque value of 40 inch pounds to provide adequate tightness to maintain proper engine support in lieu of the linear dimension as previously specified.

SL-351 Piper Lubrication of Fuel Selector Valves

09/29/2021Univair
Instructions for applying the recommended fuel valve lubricant in the listed Piper models.

SL-486A Piper Cylinder Head Temperature Probe Location

09/29/2021Univair
The following listing denotes the location of the Cylinder Head Temperature Probe for Piper aircraft.

SL-608 Piper Ceconite Aircraft Covering

09/29/2021Univair
Contains the Ceconite Application, Maintenance and Repair Procedures for Piper PA-18 and PA-25 models.

SL-617B Piper Automatic Location Transmitter

09/29/2021Univair
Instructions for replacing the old style Piper Automatic Location Transmitters with newer models.

SL-828 Piper PA-18 Electrical System Refinement

09/29/2021Univair
Materials and instructions for replacing overvoltage relay and starter power relay in the PA-18 electrical system.

SL-944 Piper Fuel Selector Valve Inspection and Lubrication

09/29/2021Univair
An improperly maintained three-position fuel selector valve could become difficult to rotate; this could result in damage to the selector lever mechanism and/or inability to switch tanks.

SL-955 Piper Forward Fuel Header Tank Installation

04/12/2022Univair
This service release announces the field availability of a new current production Forward Fuel Header Tank which provides greater resistance to impact rupture in the event of an accident.

SM-04 Piper Brake and Oleo Strut System Fluid Usage

04/13/2022Univair
Table showing the type of brake fluid used in airplanes manufactured by the Piper Aircraft Corporation.

SM-12 Piper Shock Cord Application

04/13/2022Univair
Shock cord application chart for listed Piper models.