C.F.R. » Title 14 » CHAPTER I—FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION › SUBCHAPTER C—AIRCRAFT › PART 29—AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY ROTORCRAFT › Subpart E—Powerplant

14 C.F.R. § 29.935

Shafting joints

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Each universal joint, slip joint, and other shafting joints whose lubrication is necessary for operation must have provision for lubrication.