TM 9-2330-294-14
welded to minimize distortion and to facilitate
6-43. Suspension Components
welding in the flat postiion.
Weld repair of suspension components are covered in
b. Drill holes through member at ends of crack
TM 9-237; high strength, alloy, tempered steels and
prior to making weld repair.
alloy steels shall be repaired, using 11018 electrode.
c. Avoid straightening of high strength, alloy,
Weld repairs to the walking beam require grinding of
tempered steels using temperatures over 1000 F. It
the weld deposit to be flush with the flange. Tension
is necessary that high-strength steels be heated to a
surface fillet welds shall blend with the joining
uniform temperature when attempting to straighten.
surfaces.
d. Inspect all weld repairs using magnetic particle
6-44. Landing Gear and Ramp
inspection method (steel only) or dye-penetrant
The aluminum used in the M747 landing gar and
method (steel and aluminum).
ramp is 6061 temper T6. TM 9-237 procedures shall
e. Generally, these requirements would be ap-
be used to perform repair on the structure, using
plicable to minor repairs or damage to the structure
5356 electrode or wire. Repairs made to defective
as the result of an accident. In the event that
welds require that cracks be removed prior to
repeated repairs are necessary in a particular
making weld repair, Weld repairs shall be made
location, field modifications may be necessary.
using only qualified welders employing techniques
These deficiencies should be reported through the
that will minimize loss of strength in the metal
proper channels for appropriate action.
adjacent to the weld.
f. Cracks may occur in the frame at the walking
6-45. Supplementary Repair Information
beam saddle brakcet (A, fig. 6-21) in semitrailer No.
1 through 200. If cracks develop in these areas,
a. Determine extent of defect in each component
prior to making repair. If possible, remove defective
component from vehicle or add supports to area to be