A wide variety of materials are used in aircraft finishing. Some of the more common materials and their uses are described in the following paragraphs. Acetone Acetone is a fast-evaporating colorless solvent. It is used as an ingredient in paint, nail polish, and varnish removers. It is a strong solvent for most plastics and is … Read more
Once the need for an aircraft repair has been established, Title 14 of the Code of Federal Regulations (14 CFR) defines the approval process. 14 CFR part 43, section 43.13(a) states that each person performing maintenance, alteration, or preventive maintenance on an aircraft, engine, propeller, or appliance shall use the methods, techniques, and practices prescribed … Read more
Aluminum alloys are the most frequently encountered type of sheet metal in aircraft repair. AC 43.13-1 Chapter 4, Metal Structure, Welding, and Brazing; Section 1, Identification of Metals (as revised) provides an in-depth discussion of all metal types. This article describes the aluminum alloys commonly used in aircraft sheet metal forming and repair, along with … Read more
A box can be formed the same way as the U-channel described on in the previous paragraphs, but when a sheet metal part has intersecting bend radii, it is necessary to remove material to make room for the material contained in the flanges. This is done by drilling or punching holes at the intersection of … Read more
In order to work with sheet metal during the fabrication process, the aviation technician uses a variety of holding devices, such as clamps, vises, and fasteners, to hold the work together. The type of operation being performed and the type of metal being used determine which type of holding device is needed. Clamps and Vises … Read more
Successful gas welding depends on using the proper torch position, filler rod technique, and weld sequence for the material and joint being welded. The following procedures describe the basic methods used to produce a strong, clean weld. The material to be welded, the thickness of the metal, the type of joint, and the position of … Read more
The atmosphere provides the medium in which aircraft operate. Its properties, including pressure, density, temperature, and humidity, directly affect aircraft performance, engine operation, and aerodynamic forces. Understanding the characteristics of the atmosphere is therefore essential to understanding the principles of flight. Before examining the fundamental laws of flight, several basic facts must be considered, namely … Read more
The rotor system is the most important component of a helicopter because it produces lift, thrust, and flight control forces. The design of the rotor system directly affects aircraft stability, maneuverability, maintenance requirements, and overall performance. To accommodate different operational needs, helicopter manufacturers have developed several rotor system designs. The three primary types are the … Read more
Helicopter flight is governed by several aerodynamic and mechanical forces that influence stability, control, and performance. Understanding how lift, thrust, drag, weight, torque, and gyroscopic forces interact provides the foundation for understanding helicopter flight characteristics and pilot control inputs. One of the primary differences between a helicopter and a fixed-wing aircraft is the source of … Read more
Proper assembly and rigging are essential to safe helicopter operation. Rigging ensures that pilot control inputs are accurately transmitted to the main and tail rotor systems, allowing the helicopter to respond correctly throughout its operating range. Precise adjustment and inspection of all control components are necessary to maintain flight safety and performance. The flight control … Read more
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