SERVICE BULLETIN - Univair Aircraft Corporation
Piper J-3 Cub · Service Bulletins
Overview
This service bulletin outlines modifications to the carburetor heat control for Piper J-3 Cub airplanes to improve accessibility for pilots flying solo in the rear seat. It includes detailed instructions for detaching and relocating the carburetor heat control and necessary parts for the modification.
- Service Bulletin Number: 75
- Issued on December 15, 1945
- Applies to J3 Series airplanes with specific serial numbers
- Modifications improve accessibility of carburetor heat control
- Includes detailed installation instructions and sketches
- Necessary parts and quantities are listed
- Welding is required for the installation
- Different part numbers for airplanes with and without carburetor air filter
Summary written by AI from the source document. Check the original before relying on it. See which parts of Sprinkle are written by AI.
Reference only, not for flight. Use the current approved manual for your aircraft. See terms, section 5.
Document
Source
Copy found at univair.com. Sprinkle hosts a reference copy with an added summary, specifications and searchable full text.
Document details
- Type ·
- Service Bulletins
- Year ·
- 1945
- File size ·
- 139 KB
- Copy found at ·
- univair.com
- Language ·
- en
What is the SERVICE BULLETIN - Univair Aircraft Corporation?
The SERVICE BULLETIN - Univair Aircraft Corporation is a service bulletins for the Piper J-3 Cub, dated 1945.
What year was the SERVICE BULLETIN - Univair Aircraft Corporation published?
The SERVICE BULLETIN - Univair Aircraft Corporation — the Piper J-3 Cub service bulletins on file — is dated 1945.
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In this document
Immediate Action
The bulletin addresses immediate changes needed for the carburetor heat control to enhance pilot accessibility.
Models Affected
The bulletin applies to J3 Series airplanes with carburetor heat control on the instrument panel, covering specific serial numbers.
Modification Instructions
Instructions detail the steps to detach and relocate the carburetor heat control, including welding and installation of a new control box.
Necessary Parts
A list of required parts and quantities for the modification is provided, including cable assemblies and screws.
Sketches
The bulletin includes sketches to illustrate the modification process and the placement of components.
Notes on Part Usage
Notes clarify the use of different part numbers based on whether the airplane has a carburetor air filter.
Summary written by AI from the source document. Check the original before relying on it. See which parts of Sprinkle are written by AI.
Full document text
IMMEDIATE ACTION SERVICE BULLETIN NUMBER 75 December 15, 1945 Rev. Date: 2-20-46 SUBJECT: Carburetor Heat Control MODELS AFFECTED: J3 Series Airplanes with Carburetor Heat Control on Instrument Panel. Serial Nos. 1999 to 6247 incl., 6249, 6250, 6255, 6256, 6265, 6272, 627 4, 6275, 6278, 6284, 6287. 6290, 6291, 6292, 6295, 6296, 6297, 6305 and 6321. It has been brought to our attention by the C. A. A. that several complaints have been received from owners of J3 airplanes as to the inaccessibility of the heat control on the instrument panel. In order to make this control more readily accessible for a pilot flying solo in the rear seat the following changes may be made: Detach carburetor heat control from carburetor. Remove carburetor heat control cable from upper side of instrument panel. Remove lower enclosure door. Remove enough fabric around front lower cluster of door opening to allow welding of carburetor heat control box bracket in place. Weld carburetor heat control box bracket assembly to fuselage members as per Sketch 1. Install carburetor heat control box assembly as per Sketch 2. Run cable from carburetor heat control box firewall on right side then over the left side of carburetor and attach to carburetor. PIPER AIRCRAFT CORPORATION, LOCK HAVEN, PA .. U. S. A. - 2 - NUMBER 75 The following items will be ·necessary for this change: Part No. 41481 50881 or 53411 21472-2 No.4 Nomenclature Cable Assembly - Control Box - Carburetor Heat Control (See Sketch No. 2) Bracket Assembly - Carburetor Heat Control Box 1/4" long type "A" Stove Heat P.K. Screw Dope- Clear Fabric Dope - Pigmented Quantity 1 1 1 4 1 qt. 2 yds.-42" 1/2 pt. ...... Braze I i 1...----s"t SECTIONB-B A 6 -l' "' "- ""'- A"""I I I \ \ \a- === ll -I~ Front of Airplane · 21472-2 j + -~-<1) ) "SECT - 4-~ I ION A-A 4 ---j SERVICF BULLETIN NO. 75 Braze Front Lower Cluster At Door Opening Wire Flush With Top of Tube SECTION c-c Full Size SICETCH#L .082 Hole #4 PK Screw Note: II CARB. HEAT 50881 or 53411 See Note Front of Airplane 53411 Used on Airplanes With Carb. Air Filter. 50881 Used on Airplanes Without Carb. Air Filter. SERVICE BULLETIN NO. 75 SKETCH#2