Piper PA-18

SA 18-2A Piper PA-18 Aileron and Flap Hinge Bracket Attaching Hardware

09/23/2021Univair
Correcting a condition that could cause loss of security of one or more screws which attach the aileron and flap hinge brackets.

SA MISC/TP-1001A Piper Engine Mounting

09/23/2021Univair
Tightening engine mounting bolts to obtain a torque of (40) inch pounds.

SA MISC/TP-1004 Piper Servicing Air Filter with Paper Cartridge

09/23/2021Univair
Servicing instructions for the carburetor air filter with paper cartridge.

SB-121 Piper PA-18/PA-20/PA-22 Oil Radiator Lines

09/23/2021Univair
Misalignment of the oil radiator lines on the Lycoming 0-290-D2 135 horsepower engines at the point where they pass through the rear engine baffle.

SB-122 Piper Fuel Grade Specification for Lycoming O-290-D2 Engines

09/23/2021Univair
Correction to the fuel grade specification in flight manuals and fuel tank placards for the Lycoming O-290-D2 engines.

SB-141 Piper Fuel Selector Valve

09/23/2021Univair
Possibility of the fuel valve detent pins in a few valves were improperly centered, thus preventing positive indication of valve position.

SB-148A Piper PA-18/PA-22 Fuel Tank Caps

09/23/2021Univair
A recent design change to the fuel tank caps has created a possible hazard to the venting system and it is therefore requested that the caps be reworked in the following manner.

SB-181 Piper Replacement of Flexible Stainless Steel Control Cables

09/23/2021Univair
Mandatory replacement of 1/8 - 7 x 19 flexible stainless steel control cables to prevent cracked nicopress sleeves.

SB-207A Piper PA-18 Inspection of Weld at Rudder Pedal Assembly

09/23/2021Univair
Inspecting for weld separation where the rudder pedal cable attachment fitting is welded to the rudder pedal.

SB-218 Piper Replacement of Vacuum Pump Splined Coupling

09/23/2021Univair
Reports of the vacuum pump splined coupling on Airborne Mechanisms Vacuum Pumps Models 113A5 and 113A8 may fail prematurely as a result of over-curing.

SB-305 Piper Inspection of Carburetor Drain Plugs

09/23/2021Univair
Instructions for compliance with Marvel-Schebler Division Bulletin No. A1-69.

SB-324 Piper Vacuum Pump Adapter Drive Assembly

09/23/2021Univair
Instructions for an inspection of the vacuum pump adapter drive assembly.

SB-354B Piper Fuel Selector Valve Lubrication

09/23/2021Univair
Checking fuel selector valve for ease of rotation and instructions for lubricating.

SB-445 Piper PA-18 Fuel Cap Inspection

09/23/2021Univair
Instructions to inspect the fuel tank filler caps for presence of a vent hole in the cap dome.

SB-485 Piper PA-18 Rerouting of Rudder Control Cables

09/23/2021Univair
Instructions and material to reroute the rudder control cables to prevent cable contact with the adjacent fuselage frame tubes.

SB-522 Piper Wing Fuel Tank Cap Modification

04/12/2022Univair
Reports of collapsed wing mounted fuel tanks due to inadequate venting of the tank.

SB-573 Piper Wing Fuel Tank Cap Modification

04/12/2022Univair
A recent fuel tank collapse was attributed to inadequate venting, caused by obstruction of the cap vent holes installed per Piper Service Bulletin No. 522.

SB-706B Piper PA-18 Tailbrace Wire Support

09/23/2021Univair
Instructions for the installation of an additional support plate to strengthen the attachment mechanism.

SB-759 Piper PA-18 Installation of Muffler Bail

09/23/2021Univair
Exhaust muffler inspection and modification, Piper Part Number 12433-00, 12433-14, 12232-00.

SB-868 Piper Forward Fuel Header Tank Installation

04/12/2022Univair
Installing an improved forward fuel header tank with thicker walls and welded seals, which provides greater resistance to impact rupture in the event of an accident.