Aircraft Sheet Metal Numbering System

In figure 5 the radius of bend is shown on the top line and the metal thickness is shown on the left hand column.

Aircraft sheet metal numbering system.

Forming sheet metal requires a variety of tools and equipment both powered and manual. How bend calculations are used in a bending operation. Aircraft technician relies on a wide variety of powered and hand operated tools to precisely bend and fold sheet metal to achieve the perfect shape. Aluminum lithium alloys were developed for reducing weight in aircraft and aerospace structures.

Flange is the shorter part of a formed angle. Forming at room temperature is known as cold forming. Base measurement is the outside dimensions of a formed part. Manufacturers use some system of station marking.

Various numbering systems are used to facilitate the location of specific wing frames fuselage bulkheads or any other structural members on an aircraft. Once drilled use a pin punch to tip off the rivet head and drive the remaining shank out of the hole while supporting the surrounding metal. Efficient operation of any aircraft is greatly dependent upon correct selection and use of aircraft structural hardware and seals. Center punch the rivet then drill just to the base of the rivet head with the same size or one size smaller drill.

Some sheet metal aircraft utilize construction techniques that use nothing but pop rivets that are pulled using a small inexpensive rivet tool. Aircraft hardware is usually identified by its specification number or trade name. To determine the bend allowance for a 90 bend simply use the top number in the chart. Natural grain of the material is formed as the sheet is rolled from molten ingot.

Other aircraft kits use regular structural rivets that must be squeezed or driven. To locate structures to the right or left of the center line of an aircraft a similar method is employed. The final two digits the sequence numbers are numbers that simply place the sheets in order. The tools required for this type aircraft are minimal.

Any bend formed on a. The upper number in each cell is the bend allowance for a 90 bend. The lower number in the cell is the bend allowance per 1 of bend. Many manufacturers consider the center line of the aircraft to be a zero station.

Bend allowance and bend radius all the space between the band tangent lines is the. Types of shrinking and stretching tools used for aircraft metal structural repair. Department of transportation federal aviation administration 800 independence avenue sw washington dc 20591 866 tell faa 866 835 5322. The third digit the sheet type is a number that represents the type of drawings that are on the sheet plans sections details schedules etc.