S9074-AR-GIB-010/278
12.3.5 Substitution of tests. When RT is specified and the geometry of the castings is such that inspection by radiography is not meaningful or cannot be performed in accordance with MIL-STD- 271. MT or PT. as applicable, may be substituted when approved. PT may be substituted for MT when a casting surface location or condition is such that it is inaccessible for MT or may be injured or contiminated by the MT method. UT. in accordance with an approved written test procedure. may be substituted for RT when approved for the application.
12.4 Acceptance criteria.
12.4.1 Visual examination. Casting surfaces shall be free from cracks, tears. laps. shrinkage, inclusions. gas holes, and other harmful or injurious defects. Ferrous castings shall meet the requirements of SP-55. 12.4.2 MT. PT. and RT. Acceptance criteria for MT. PT. and RT shall be as specified in tables XVI. XVII. XVIII, XIX, and XX.
TABLE XVI. Acceptance Criteria for MT and PT . 1
Finished metal thickness
PT
MT
Cast Material
( Inches )
MIL-STD-2035
FERROUS CASTINGS Corrosion-resistant steel Carbon Steel Alloy steels Non-Ferrous Castings Nickel base alloys Copper-nickel Aluminum-bronze Nickel-aluminum bronze Manganese bronze
Class 1 Class 2 Class 3
Class 1 Class 2 Class 3
Less than 1 1 to 3 over 3
Class 2 Class 3
1 and less over 1
--- ---
Class 2 Class 3
1/2 and less over 1/2
--- ---
Tin-Bronze
Class 2
---
Aluminum
---
Class 1 Class 2 Class 3
Titanium-titanium alloys
Less than 1 1 to 3 over 3
--- --- ---
It is characteristic of some castings to be subject surface craze cracking. MT or PT indications of such craze cracking shall not be prejudicial when they do not exceed 5/16 inch in length. Indications beyond this length shall require removal . except that such indications may be approved subject to technical evaluation for acceptability dependent on intended application service conditions. 1.
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