Piper SARATOGA PA-32-301 Maintenance Manual page 94

PIPER AIRCRAFT
PA-32-301/301T
MAINTENANCE MANUAL
GENERAL.
This chapter contains general information pertaining to standard aircraft hardware installation and
removal practices. The information included will be very helpful if it is referred to on a regular basis.
For standard repair practices of a minor nature, refer to AC43.13.
If repairs dictate Non-Destructive Testing (N.D.T.) after repair such as welding, magniflux should be
used on materials made from 4130 steel such as engine mounts and seat frames.
Testing and inspecting of aluminum castings and machined aluminum parts may be accomplished by the
dye penetrant method.
Usually, a good visual inspection with 10X magnifying glass will show any damage or defect in a repair
that is of a significant nature.
TORQUE WRENCHES.
Torque wrenches should be checked daily and calibrated by means of weights and a measured lever arm to
make sure that inaccuracies are not present. Checking one torque wrench against another is not sufficient and
is not recommended. Some wrenches are quite sensitive as to the way they are supported during a tightening
operation. Any instructions furnished by the manufacturer must be followed explicitly.
When it is necessary to use a special extension or adapter wrench together with a torque wrench. a simple
mathematical equation must be worked out to arrive at the correct torque reading. Following is the formula to
be used: (Refer to Figure 20-1.)
T =Torque desired at the part.
A = Basic lever length from center of wrench shank to center of handle or stamped on wrench or listed for
that model wrench.
B = Length of adapter extension, center of bolt to center of shank.
C = Scale reading needed to obtain desired torque (T).
EXAMPLE
A bolt requires 30 foot-pounds and a 3 inch adapter (one-quarter of
a foot or .25) is needed to get at it. You want to know what scale
reading it will take on a one-foot lever arm wrench to obtain the 30
foot-pounds at the bolt.
Remember, the 3 inch adapter must be projecting 3 inches straight
along the wrench axis. In general, avoid all complex assemblages or
adapters and extensions of flex joints.
20-01-00
Page 20-01
1D22
Revised: August 11, 1983
ID22