JOHN PROPST

This article discusses the conversion of Champs and Chiefs from one model to another. 

This article discusses the inspection and repair of fuel shutoff valves 

This article discusses the repair of oleo struts on Champs and Chiefs. It includes information from John Baker's website plus additional information from Bill Pancake, David Rude, and others. 

This article provides suggested guidance for the inspection and maintenance of oleos during annual and 100 hour inspections.

This article provides information related to Maule Tailwheel shimmy problems. 

This article discusses a common problem of oil leaking from the airbox on small continental engines. 

This article reviews in detail the installation of hydraulic toe brakes on an Aeronca Champ. 

This article discusses methods for measuring and adjusting the limits of travel on elevators, trim tabs, rudders, and ailerons.  

This Field Approval covers the installation of an aircraft sealed battery system to power the starter, com radio, and misc other elec devices.  

This Field Approval covers the installation of a customized instrument panel with additional instruments.  

This Field Approval covers the installation of rails for adjusting the front seat forward or aft in 1/2" increments up to 2" total travel. 

This Field Approval covers the installation of a customized engine cowling with hinge joint and lengthened to fit the C90 mount. 

This Field Approval covers the re-installation of the existing ELT that was removed from the aircraft prior to restoration.   

This Field Approval covers the installation of Cessna mufflers rather than the specified Hanlon Wilson. 

This Field Approval covers the use of a C90 engine mount which is 2" longer than the standard A65/C85 mount. 

This Field Approval covers the installation of a modified airbox on the Marvel Schlibler carb. 

This 337 covers the EAA autogas powerplant STC. Note that the application of the EAA autogas STC requires both a powerplant and airframe 337. 

This 337 covers the installation of a Kit 192 26 gallon fuel system consisting of two 13 gallon wing tanks. 

This 337 covers the eCI STC for use of valve rotaters on the eCI cylincers. There is a 337 issued for each of the four cylinders. 

This 337 covers the application of the Lasher STC for the installation of a C 85-12 engine  

This 337 covers the application of a spin on oil filter on a Continental C 85-12 engine.  

This 337 covers the installation of a Sky-Tec electric starter on the continental C 85-12 engine. 

This 337 covers the installation of new Cleveland Wheels and hydraulic brakes.