AMS 375 - FINAL LUBRICATION OF SPHINCTER (Latest Update 2026 / 2027) Questions & Answers {Grade A} 100% Correct

AMS 375 - FINAL LUBRICATION OF
SPHINCTER (Latest Update 2026 /
2027) Questions & Answers {Grade A}
100% Correct



What type of engine are ball-type thrust bearings commonly found on? - correct


answer Radial




What type of checks do engines with ball-type thrust bearings require before


separating the crankcase of loosening the bearing thrust nuts? - correct answer


Propeller flange or shaft run-out check




What is heavy aromatic naphtha (Black Tank) used for? - correct answer Carbon


stripper; removing paint and other FOD on metal

,What must happen if a magnesium part is accidentally exposed to the carbon


stripper? - correct answer - Remove stripper and wash part



- Treat with SODIUM DICHROMATE



- Apply Preservation (primer or oil)




What is light aliphatic naphtha (Big Red Tank/final clean tank) used to clean? -


correct answer Recyclable parts washer




What is Isoparaffinic Hydrocarbon used for? - correct answer Decreasing prior to


engine painting




*Dries residue free

, What 3 characteristics does Aqueous Soap have to have to be used on aircraft


engine components? - correct answer - Non foaming



- Low PH



- Mild-Alkali




Why must parts be rinsed after an aqueous soap wash cycle? - correct answer To


prevent soap embedment




3 types of abrasive medias - correct answer - Hard



- Soft



- Shot Peening




5 types of hard abrasive medias - correct answer - Silicon carbide (hardest)



- Aluminum oxide (long lasting)