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Figure 2-2 Repair steps for severely distorted plates
Up
TM-5-5420-279-23 Dry Support Bridge (DSB) (NSN
Next
Check the straightened area for cracks
TM 5-5420-279-23
(f)
Witness the temperature in following step and confirm that temperature has
not exceeded 470oC (878oF).
(g)
Using an oxy-propane torch, apply heat evenly on both sides of the plate
along the centerline through the distorted area without dwelling in one position. Make
sufficient passes along both sides to achieve a temperature, measured between the
witness lines, of 400oC-450oC (842-878oF). Make frequent temperature checks using
a suitable measuring device (Section 4 Table 4-1, Item , 14).
(h)
Allow the plate to cool naturally.
(2)
Straighten the plate.
CAUTION
The aluminum component must be straightened within twelve hours of completion
of the heat treatment operation.
(a)
Straighten the plate using standard workshop panel beating practices.
WARNING
ENSURE SOLVENT IS DRY BEFORE WELDING.
CAUTION
Aluminum and aluminum alloys should not be cleaned with caustic soda or strong
cleaner with a pH above 10. The aluminum or aluminum alloy will react chemically
with these types of cleaners. Other non-ferrous metals and alloys should be
investigated prior to using these cleaners to determine their reactivity.
(b)
Clean along cut on both sides of plate with solvent (Section 4 Table 4-1, Item ,
7).
(c)
Wire brush along cut on both sides of plate.
WARNING
PRIOR TO ANY WELDING ON THE LAUNCH VEHICLE PROCEDURE 6-39 GENERAL
WELDING MAINTENANCE FROM TM 9-2320-364-34-2 CHAPTER 2 MUST BE
PERFORMED ALONG WITH THE DISCONNECTION OF ALL EXTERNAL MIL
CONNECTORS FROM BOTH THE LAUNCHER CABINET AND THE OPERATOR
CABINET. BOTH THE CHEST PACK AND THE TAIL LIFT PENDANT MUST ALSO BE
REMOVED.
(d)
If the cut runs to the edge of the plate, tack end of the cut.
(e)
Weld the cut (fig.2-2 (e) and para. 2) in accordance with the parameters laid
down in the weld procedures in Section 6.
(f)
Dress welds flush (fig.2-2 (f)).
(3)
Inspect welds (Section 3 b).
Appendix K Page 9

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