Aeronca Technical Information
This page contains information of a technical
nature for Aeronca enthusiasts.
Type Certificate Data Sheets - official
specifications for aircraft from the FAA. In PDF format, requires
A-759 - The Type
Certificate Data Sheet for 7 Series aircraft. Added
8/30/05, Updated 1/30/10.
A-761 - The Type
Certificate Data Sheet for 11 Series aircraft. Added
8/30/05, Updated 1/30/10.
A-796 - The
Type Certificate Data Sheet for the 11CC Super Chief.
- The Type
Certificate Data Sheet that covers several pre-war Aeroncas, including the 65-CA
Super Chief. Added
10/13/06, Updated 1/30/10.
A-702 - The Type
Certificate Data Sheet that covers severak pre-war Aeroncas, including the
50L, the 50LA, the 65L and the 65LB (L-3G).
A-802 - The Type
Certificate Data Sheet for 15AC Sedan. Added
10/13/05, Updated 1/30/10.
John Propst Articles Relating to the Aeronca Champ and Chief - A great
collection of tech articles, highly recommended.
23-27 - FAA guidance on parts and materials substitution for vintage
aircraft. Added 7/17/09.
Alternative Method of Compliance (AMOC) for 15AC Sedan Spar Airworthiness
Directive. Carl Bahn has developed an AMOC for inspection of Sedan
wing spars using a borescope. For the AMOC click
and for the FAA letter of approval click
are both PDF files requiring a PDF reader.
Bulletin SB3-03. Differential Pressure Test and Borescope Inspection
Procedures for Cylinders. Current procedures for a compression check,
Information Letter SIL99-2B - Current listing of sealants, lubricant, &
adhesives authorized by Teledyne Continental Motors. Need to know what
oils are approved for the Continental engine in your Aeronca? Here's the
C-85-12 Tachometer Drive Seal Replacement - Photos and tips on replacing the
seal to solve an oil leak where the tach cable attaches.
FAA Policy Statement on Shoulder Harness Retrofits -
A recent policy permits
the installation of shoulder harnesses in older aircraft as a "minor change."
Cables - do you have the correct brake cable on your Champ or Chief?
An improper cable could cause an embarrassing moment. Here's info
on what to look for. Added 3/11/01,
Goodyear Brake Return Springs.
The Goodyear mechanical disc brakes on many of our Aeroncas require some
special care. One area of interest is the return spring that pulls
the puck away from the disk when the brakes are released. A stronger
spring allows the brakes to be adjusted so that the puck sits closer to
the disc in the released position, improving performance when the brakes
are applied. Here are photos of two different types of return springs.
The spring in Photo #1 does the better job of keeping the puck away from
the disc when released. Both photos (and the information) are courtesy
of Richard Starr. Photo
#3 shows the spring on my Chief, N86176, the same type of spring as in
photo #1. This photo is taken from the front, with the wheel and disk removed.
Spring Photo 1
Spring Photo 2
Spring Photo 3
Goodyear Brake Adjustment
a copy of the article on Goodyear Brake
adjustment that appeared in Joe Dickey's Aeronca Aviator newsletter,
Issue No. 15. Autumm, 1985.
Back issues of the original newsletters are
now available from the Aeronca Aviators Club.
Added 9/18/06, updated 6/29/09.
Strut Maintenance - is your Aeronca on the level? If not, maybe
you need to replace an oleo strut spring. Here's how.
Added 5/5/02; Updated 9/6/14.
Owner Produced Parts
- FAA guidance on a complex topic. This is a PDF copy of a 1993 Memorandum
from the FAA Assistant Chief Counsel for Regulations.
Goodyear Brake Pads. The round pucks
for the Goodyear mechanical brakes are hard to find. Some make their own
from truck brake pad material. The pucks are 1.25" in diameter. Each
brake assembly uses one thin (.25" thickness, Goodyear PN 9511257) anvil and one thick (.375"
thickness, Goodyear PN 9511258) piston.
The inboard, or moving piston pucks are the thick .375" pucks, the outboard, or
fixed anvil pucks are the thin .25" pucks.
4/27/09. Updated 3/9/15.
Penetrating Oil. Machinists
Magazine reports that an effective penetrating oil for removing rusted bolts
and screws is a 50/50 mix of acetone and automatic transmission fluid.
This homebrew proved better than commercial products such as Liquid Wrench and
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