CHAPTER 4
AIRCRAFT METALLIC REPAIR
Tools should not be placed on finished parts or
INTRODUCTION
machines.
Before performing aircraft metallic repair, you
There are many different types of hand tools used
must be familiar with the tools, special equipment,
for aircraft metallic repair and sheet metal fabrication.
terms, and techniques used to accomplish this type of
In the following text, we will discuss a few of the more
maintenance. In the following text, we will discuss
common types used for sheet metal fabrication. For a
these subjects and basic sheet metal fabrication
more detailed explanation of all of the various hand
procedures as well as several different types of aircraft
tools associated with aircraft metallic repair and sheet
structural metallic repair procedures. Before you
metal fabrication, refer to Use and Care of Hand Tools
perform any type of structural repair to an aircraft,
and Measuring Devices, NAVEDTRA 14256.
always consult the applicable aircraft Maintenance
Instruction Manual (MIM).
Hammers
STRUCTURAL TOOLS
Hammers are used to apply a striking force where
the force of the hand alone is insufficient. Each of the
LEARNING OBJECTIVE: Identify the var-
hammers discussed in this section is composed of a
ious structural tools used for sheet metal
head and a handle, even though these parts differ
fabrication. Identify the various structural tools
greatly from hammer to hammer.
used for aircraft structural repair.
BALL PEEN HAMMER.--The ball peen
You should always have a thorough knowledge of
hammer is sometimes referred to as a machinist's
the tools of your trade. This will enable you to increase
hammer. It is a hard-faced hammer made of forged tool
the quality of maintenance on your squadron's aircraft.
steel. See figure 4-1.
One of the most important skills that you can have is the
ability to use the tools that are required to complete any
The flat end of the head is called the face. This end
given task in a timely and professional manner. These
is used for most hammering jobs. The domed end of the
tools include various hand tools, power tools, drills, and
hammer is called the peen. The peen end is smaller in
special tools.
diameter than the face, and is useful for striking in areas
that are too small for the face to enter.
HAND TOOLS
Before discussing the tools individually, a few
comments on the care and handling of hand tools are
appropriate. The condition in which you maintain your
tools determines your efficiency as well as how your
superiors view your day-to-day work.
Each mechanic should keep all assigned tools in the
toolbox when they are not being used. Every tool
should have a place, and every tool should be kept in its
place. All tools should be cleaned after every use and
before being placed in the toolbox. If they are not to be
used again the same day, they should be oiled with a
light preservative oil to prevent rusting. Tools that are
being used at a workbench or at a machine should be
kept within easy reach of the mechanic, but should be
kept where they will not fall or be knocked to the deck.
Figure 4-1.--Hammers.
4-1
