Tools in Aircraft Maintenance

Screwdriver  

The screwdriver can be classified by its shape, type of blade, and blade length. It is made for only one purpose, i.e., for loosening or tightening screws or screw head bolts. When using the common screwdriver, select the largest screwdriver whose blade will make a good fit in the screw that is to be turned. A common screwdriver must fill at least 75 percent of the screw slot. If the screwdriver is the wrong size, it cuts and burrs the screw slot, making it worthless. The damage may be so severe that the use of a screw extractor may be required. A screwdriver with the wrong size blade may slip and damage adjacent parts of the structure. The common screwdriver is used only where Slotted-head screws or fasteners are found on aircraft. An example of a fastener that requires the use of a common screwdriver is the cam-lock style fastener that is used to secure the cowling on some aircraft.


The two types of recessed head screws in common use are the Phillips and the Reed & Prince. Both the Phillips and Reed & Prince recessed heads are optional on several types of screws. The Reed & Prince recessed head forms a perfect cross. The screwdriver used with this screw is pointed on the end. Since the Phillips screw has a slightly larger center in the cross, the Phillips screwdriver is blunt on the end. The Phillips screwdriver is not interchangeable with the Reed & Prince. The use of the wrong type of screwdriver results in the mutilation of the screwdriver and the screw head. When turning a recessed head screw, use only the proper recessed head screwdriver of the correct size. The most common crosspoint screwdrivers are the Number 1 and Number 2 Phillips. An offset screwdriver may be used when vertical space is limited. Offset screwdrivers are constructed with both ends bent 90° to the shank handle. By using alternate ends, most screws can be seated or loosened even when the swinging space is limited. Replaceable tip screwdrivers, sometimes referred to as "10 in 1" screwdrivers, allow for the quick changing of a screwdriver tip and economical replacement of the tip when it becomes worn. 

tools may vary, but good practices for safety, care, and storage of tools remain the same.


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