Page 37 - Aeronca 7A Interactive Service Manual

COWL AND COVERING

COWLING
Engine installation is enclosed with three sections of aluminum alloy, namely the nose, top and lower
cowlings. These cowlings are secured with Dzus fasteners (incorporated at the most desirable points of
accessibility) and self-locking nuts and machine screws.

The wraparound cowling which encloses the fuselage aft of firewall is a semi-permanent installation. This
cowling is one piece of aluminum alloy secured to firewall, fuselage and instrument panel with P.K. screws
and machine bolts and stop nuts. An adjustable clamp assembly provides access to front rudder and brake
pedal assemblies, besides securing the cowling together at the bottom.

Inspection plates on wings and fuselage covering are strategically placed to enable inspection of all critical
structural parts and control cables.

FINISHING SPECIFICATIONS
N.C. numbers are enamel instead of dope.

Using intermediate pre-doped fabric as covering material, the following dope application is made:
One cross coat of clear dope brushed and sanded.

One cross coat of aluminum pigmented dope sprayed and sanded.
One cross coat of color pigmented hot dope, sprayed.

NOTICE: The use of special equipment at the factory in the application of hot dope makes
possible fewer application operations. Aeronca’s use of pre-doped fabric plus hot dope is
equivalent to regular fabric and eight coats of dope applied cold.

Zinc chromate primer is used on all metal parts of the structure including landing gear components,
cowling and fairing. Hot dope is applied over this primer on all of these exposed surfaces.

When doing touch-up or repair work in the field “hot” dope and “cold” dope may be used interchangeably.
However when applying “hot” dope cold, be sure to use “cold” thinner.

When washing the airplane use only mild soap and water, being sure to rinse thoroughly.

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