MIL-STD-2199A APPENDIX B
i. Allow a minimum of 2 hours for the sealing/fairing compound to cure and then spark test both the sealant and the elastomeric coating. If there are any area(s) that spark, continue to brush sealant and/or coating onto the suspect area(s), as applicable, until a satisfactory spark test is achieved.
j. Accomplish steps B.2.1.2.2.2.i through k.
B.3.1.2.3 Repair (for shafts possessing only a GRP layer).
B.3.1.2.3.1 Repair of visible surface defects. If the GRP contains visible surface defects such as scattered or isolated pinholes, pimples, porosity, or rough spots, none of which produced a spark during the spark test, coat subject areas with resin in accordance with B.3.1.2.2.1.
B.3.1.2.3.2 Repair of unbonded GRP. If the GRP contains area(s) of unbonded GRP, whether evident or suspected, none of which produced a spark during the spark test, repair as follows:
a. Remove a band of GRP from around the entire circumference of the shaft, in way of each unbonded area, until fully bonded GRP is reached. A disc sander, Dremel tool (or equal), or suitable abrasive cutting tool may be used to score the GRP. The fiberglass cover in the damaged or defective area is to be removed with a disc sander after being scored. Exercise extreme caution not to damage the underlying shaft surface when removing the GRP.
b. Bevel the edges of the GRP on both sides of each defective area 1 to 2 inches.
c. Inspect the shaft steel for damage/deterioration as outlined in the applicable shafting TRS or MS and/or
S9086-HM-STM-010/243 and repair accordingly.
d. Prepare the bare steel area(s) for application of the GRP in accordance with A.3.1.1 as applicable.
e. Prepare a length of glass tape sufficient to provide a four-ply layer for each band to be repaired. For narrow repair sections, use 2- to 4-inch wide glass tape. Re-apply the GRP over the area(s) from which it was removed in accordance with A.3.2.4. Ensure the GRP extends over the beveled edges and smoothly blends with adjacent GRP surfaces.
NOTE: If the repair is accomplished with the shaft in place and the shaft line cannot be rotated, peel ply tape shall be applied over the last layer of GRP. Once the resin has cured, this ply is then peeled off, taking runs or sags with it.
f. After the resin has cured, each of the repaired areas shall be re-inspected with the spark tester to validate the integrity of the GRP.
g. Upon achieving a satisfactory spark test, paint each repaired area in accordance with A.3.2.6.
B.3.1.2.3.3 Repair of damaged areas not in way of sleeve ends. If the GRP contains damaged areas which likewise produced a spark during the spark test (not in way of the sleeve end(s)), repair in accordance with B.3.1.2.3.1.
B.3.1.2.3.4 Repair of damaged areas in way of sleeve ends. If the GRP contains damaged areas, specifically in way of the sleeve end(s), which likewise produced a spark during the spark test - OR - exhibits evidence of seawater penetration at the GRP-to-shaft sleeve interface(s), repair as follows:
a. Remove a band of GRP from around the entire circumference of the shaft, in way of each damaged sleeve end, beginning at the GRP-to-shaft sleeve interface and extending axially a minimum of 6 inches past the shaft-to- sleeve interface or until fully bonded GRP/clean shaft metal is reached. A disc sander, Dremel tool (or equal), or suitable abrasive cutting tool may be used to score the GRP in way of the shaft. The fiberglass cover in the damaged or defective area is to be removed with a disc sander after being scored. Exercise extreme caution not to damage the underlying shaft surface when removing the GRP.
b. Bevel the edge(s) of the GRP 1 to 2 inches.
c. Remove all remaining sealing/fairing compound used to contour the sleeve end with the shaft. Utilize a chisel or screwdriver to score the compound and peel away from the sleeve end. However, exercise extreme caution not to damage the underlying shaft surface.
d. Examine the shaft-to-sleeve interface(s) as well as the exposed shaft steel surface(s) for damage/deterioration as outlined in the applicable shafting TRS or MS and S9086-HM-STM-010/243 and repair accordingly.
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