Ercoupe Service Memorandum 51
ERCOUPE 415-C · Service Bulletins
Overview
This service memorandum provides instructions for the installation of 5.00 x 5 and 6.00 x 6 nose wheels on Ercoupe aircraft, specifically for serial numbers 113 through 4868. It emphasizes the importance of these installations for aircraft operating in rough conditions and details the necessary parts and procedures for the installation.
- Installation is recommended for Ercoupes subject to rough landings.
- Nose wheels are compatible with specific strut types.
- Complete nose gear assemblies are available from distributors.
- A new weight and balance computation is required after installation.
- Tire pressure must be monitored to prevent shimmy.
- Lock washer thickness should be checked and replaced if necessary.
Document
Source
Originally published by univair.com. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.
Document details
- Type ·
- Service Bulletins
- File size ·
- 56 KB
- Publisher ·
- univair.com
- Language ·
- en
Specifications & performance
Extracted from this document.
Specifications
- Nose wheel size ·
- 5.00 x 5 and 6.00 x 6
- Tire pressure 5 00 x 5 ·
- 15-18 P.S.I.
- Tire pressure 6 00 x 6 ·
- 6-10 P.S.I.
What is the Ercoupe Service Memorandum 51?
The Ercoupe Service Memorandum 51 is a service bulletins for the ERCOUPE 415-C.
Where does the Ercoupe Service Memorandum 51 come from?
This copy of the Ercoupe Service Memorandum 51 was originally published by univair.com and is hosted on Sprinkle as a free, searchable reference copy.
Most owners only have the POH. Here's the essential set for the ERCOUPE 415-C.
- Pilot's Operating Handbook / AFM
- Checklist
- Maintenance Manual
- Parts Catalog (IPC)
- Systems & Wiring
- Service Bulletins on file
- Type Certificate (TCDS)
More ERCOUPE 415-Cmanuals & documents
- Ercoupe POHPilot's Operating Handbook
- Ercoupe Service Bulletin 33 Revision AService Bulletins
- Ercoupe Service Bulletin 32Service Bulletins
- Ercoupe Service Memorandum 44Service Bulletins
- Ercoupe Service Memorandum 46Service Bulletins
- Ercoupe Service Memorandum No. 41Service Bulletins
- Ercoupe Service Bulletins & Ltrs. by topicService Bulletins
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In this document
Purpose
The memorandum outlines the installation instructions for 5.00 x 5 and 6.00 x 6 nose wheels on Ercoupes.
Parts Required
Lists the necessary parts for installing both the 5.00 x 5 and 6.00 x 6 wheels.
Installation Procedure
Describes the step-by-step process for removing the old nose gear and installing the new wheels.
Tire Pressure Recommendations
Specifies the recommended tire pressures for the nose wheels to avoid shimmy.
Weight and Balance
Notes that a new weight and balance computation is required after installation.
Lock Washer Inspection
Advises checking the thickness of the lock washer on the 5.00 x 4 wheel.
Safety notes
- Too high or too low tire pressure can increase shimmy tendency.
- The 6.00 x 6 main wheel tires require 17 P.S.I.
- Lock washer must be .050" thick, not .032".
Full document text
ERCOUPE SERVICE MEMORANDUM No. 51 Installation of the 5.00 x 5 and 6.00 x 6 nose wheel 1. The purpose of this memorandum is to give in- structions on the installation of the 5.00 x 5 and 6.00 x 6 nose wheels on Ercoupes, serial numbers 113 through 4868, inclusive, and to strongly recom- mend the installation of these gears on Ercoupes which are subject to unusually rough landings or operating from unusually rough fields. 2. All Ercoupes, serial numbers 4424 and above, were delivered with the Electro! type nose oleo strut. Ercoupes manufactured before serial 4424 were originally equipped with the Erco strut; however, the Erco and Electro! gears are interchangeable as assemblies after serial number 123. The support for the 5.00 x 5 wheel is designed to fit only the Electro! strut, whereas the 6.00 x 6 wheel support may be obtained for either the Erco or Electro! strut. Any purchase order for the 6.00 x 6 wheel support must include the type of oleo strut on which the wheel is to be installed. 3. Complete nose gear assemblies and detail parts are available from Ercoupe distributors and dealers. Prices are being published through them. 4. The following parts are required for the installa- tion of the 5.00 x 5 wheel on the Electro! strut: Pari Number Nomenclature Quantity 415-34355-S Support and Axle Assembly.. 1 415-34353 Nut, Wheel Retaining.. 1 415-34360-1 Wheel, 5.00 x 5 ... 1 415-34360-2 Tire I 415-34360-3 Tube I The following are the parts necessary for installation of the 6.00 x 6 wheel on either the Electro! or Erco struts: Nomenclature Part Number 415-34361 415-34361-S 415-33214 415-34364 415-34365-1 415-34365-2 415-34365-3 Support and Axle Assembly (Electro!) ... Support and Axle Assembly (Erco Strut) Nut, Wheel Retaining .. Quantity 1 1 1 1 1 1 Spring, Taxiing .. Wheel, 6.00 x 6 .............................................. . Tire Tube ........................................ . 5. The procedure outlined below is suggested for use in installing the larger nose wheels: A. Remove the nose gear from the airplane, re- move the wheel ( 5.00 x 4) from the support, and remove the support from the inner cylin- der in accordance with Service Memorandum number 41. B. Assemble wheel support to inner cylinder. ( I ) Coat base of wheel support with Litharge of Lead Oxide and glycerine. ( 2 ) Secure wheel support to inner cylinder with washer and self-locking nut. C. When installing the 6.00 x 6 wheel, the taxi spring, part number 415-34041, must be re- placed with the new spring, part number 415- 34364. In order to install the new spring the oleo strut must be disassembled. D. Install wheel assembly. ( I ) Tap or press wheel on axle with the valve stem away from the wheel support. ( 2) Install retainer nut and tighten with a spanner wrench or lap using a soft-nose punch. Align slot with cotter pin hole in axle and safety with cotter pin. ( 3 ) The recommended tire pressures of the nose wheels are: 5.00 X 5 15-18 P.S.l. 6.00 X 6 6-10 P.S.l. Too high or too low a pressure in the nose wheel tire will increase the tend- ency of the nose wheel to shimmy. Cau- tion-the 6.00 x 6 main wheel tires re- quire 17 P .S.l. E. Install nose landing gear to airplane in ac- cordance with Service Memorandum number 41. 6. A new computation of the weight and balance is required, and a standard C.A.A. Repair and Altera- tion Form must be filed. 7. We also wish to bring to the attention of all Ercoupe owners and operators the fact that the lock washer, part number 415-34110-3, on the 5.00 x 4 wheel should be examined to be certain it is .050" thick and not .032", and should be replaced with a new one rather than reused.