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R... The term 'match drill' should be used only when all-parts are pre-drilled to exacting tolerances with undersized holes that allow a degree of jig/fixture-less assembly with clecos, or other tight-fitting temporary fasteners etc. The assembly is THEN re/final-drilled to nominal-sized holes...

CPC... civil aircraft get shot at all the time. During a discussion of MIL Acft battle damage/repairs with a Boeing-commercial guy from Wichita... he casually confided in me that 737 fuselages transported by railroad enmasse [+/-10-Acft per rail shipment] to SEA WA regularly arrive with one or...

I have several books... There are a few newer books dedicated for training structural mechanic/assemblers. BUT A&P courses at a reputable college are [Spartan, Embry-Riddle, etc] are still the best options for new mechanics... for common basic-skills/knowledge and discipline... /NOTE1/ in...

Perhaps the turboprop is [also] the source for electrical power for test flights? For test-bed Acft this is a 'typical arrangement'. For Giggles.... Here was an arrangement vetted in the 1970s. There was a turbo-prop hung on the nose... and a small 'fanjet-engine' for take-off/heavy in the...

Suggest You review AD's and SB's for Your engine and narrow-down either the recommended borescopes... available or obsolete... and/or define the borescope functional requirements... and have conversations with borescope OEMs regarding your application/requirements. IF your requirement and the...

RE ASME B46.1 Surface Texture (Surface Roughness, Waviness, and Lay)... [Units in microinches/Roughness Average]... Generally speaking... as-is plating's... will roughly double the surface roughness of the base metal it is applied 'over'. IE...16-microinch RA [16-RA] machined/blasted...

I got myself thinkun'... One element/rule of certain SStl alloys in aerospace is 'do not disturb the natural passive finish... let it do it's job'. What 'IF' these owners decided to clean/polish/brighten the natural SStl 'passivation patina'... using chemicals/abrasives that would strip-off...

OK RE Starship launches from S Texas... I see a few problems for the long term. At a high pace of launches... the local land/home owners will eventually be forced [by eminent domain] to leave for safety... and the need for SpaceX 'growth', IE: more launch sites, employee housing, mundane...

Geezzz... The HSTB409 is a 'shortened Hi-Tigue' ['Hi-Lite/Hi-Tigue']. The Hi-Tigue equivalent to HSTB11 = HLT11. The 1OS [+1/64] for HLT11 is HLT111... and the 2OS [+1/32] would be HLT211. BTW... the bead is the 'shaded ring area at the end of the shank at the threads'... that is a barely...

Simple question... 'What'... ... Are You inspecting... and 'where'? The Factory? A Laboratory? On-Aircraft structure or systems? Engine? Electronics, electrics and wiring? Landing gear? Accessories? ... Are You 'looking for'? AND what accuracy and level of confidence do you need? ... OTHER...

I RF'ed post #8. ------------------------------ Green 123... RE 737 SB... read the fine Print... Export of this technology is controlled under the United States Export Administration Regulations (EAR) (15CFR 300-774). An export license may be required before it is used for development...

SAE is leading this charge... lots of related info. See SAE website.

Ask this question in following forums... https://www.theairlinepilots.com/forum/ https://www.airlinepilotforums.com/engineers-technicians/ https://forums.propilotworld.com/forumdisplay.php

FYI 300 series magnetic properties. I checked the AeroSpace Metals Handbook*, before throwing my statement 'very low magnetic [permeability] for 300-series SStl' up-against the wall... ASMH volume number, alloys... #1301 301, 302 SStl #1302 303, 303se SStl #1303 304, 304L SStl #1307 316, 316L...

A few related questions... 'seez the guy late to the discussion'... I am unfamiliar with casting alloy A304... what is the procurement specification [ASTM, etc] for your part? What temper are you heat treating the A304 to... none/as cast, -O, -T3, -T4, -T6? Have you validated the alloy/temper...

Any 'stainless steel' with enough ferrous content... to attract and hold a magnet... has to have either a rogue/excessive ferrous content... or is NOT 300-series SStl... series which is virtually non-magnetic. Hmmm... the last DeLorean SStl body car I saw on the road... just recently... was in...

FYI.. related... NASA Deals with lots of SSTL issues in their various seacoast environments: NASA TN D-6519 Corrosion Study of Bare and Coated Stainless Steel. I suspect alloy or residual surface impurities [machining lubricants with chlorides, etc]... not fully removed by the pre-cleaning...

ASTM A370 Standard Test Methods and Definitions for Mechanical Testing of Steel Products TABLE 2 Approximate Hardness Conversion Numbers for Nonaustenitic Steels (Rockwell C to Other Hardness Numbers) TABLE 3 Approximate Hardness Conversion Numbers for Nonaustenitic Steels (Rockwell B to Other...

DOD-HDBK-249 METALS AND ALLOYS, RAPID ON-SITE IDENTIFICATION OF (RECOMMENDED PROCEDURE FOR CHEMICAL SPOT TESTING AND ASSOCIATED PHYSICAL TESTS TO VERIFY METAL ALLOY CLASSIFICATION) (METRIC) 7.3.1 Spot testing for identification of silver brazing alloys is infeasible. Where possible, suitable...

mfg... RE OP post #3... Mentions 'BAC'... suggests this is a Boeing drawing. AMS2759/* would likely not apply. However, MIL-H-6875 might apply... if drawing is old-enough.