Inspect the attachment of lower hinge and if cracks have developed in the spar or rib reinforce with .040 dural or steel channel as shown.
Heat output of the heaters provided with the single opening exhaust system can be increased by incorporating the following changes.
Safety measure to prevent possible icing of the lower end of the crankcase breather tube.
Correcting low oil temperature in the engine during cold weather operation.
Modifications to the fuel injector vent.
Arranging baffling for better engine cooling.
Modifications to prevent fuel line failures aft of the firewall.
Recommended repair for fuselage skin cracks at rear wing spar.
Recommended repair for cracks in rear fin spar at upper hinge bracket.
Instructions for adding extension elbows to the mufflers of affected aircraft in order that their exhaust outlets be at least nine inches from their respective center lines.
Recommended repair and alteration for fraying rudder cables.
Inspection and recommended repair to aileron hinge bracket.
Inspection of front stabilizer fittings for cracks.
Reinforcing the rudder horn to prevent the rudder from breaking loose during takeoff.
Inspection and repair of Lycoming engine mounts.
Inspection and alteration of tail bulkhead and fin spar for clearance of elevator horn.
Materials list and instructions for repairing damaged Pliocel fuel cells. Includes procedures for both temporary and permanent repairs.
Information on stack exhaust systems on the older Model 8 airplanes supplying marginal carburetor heat under severe or unusual atmospheric conditions. Information on Harding fuel selector valves presenting some operational and service difficulties.
Method of effecting engine change for increased horsepower.
Modification for installing Silflex jack strut.