Analysis of Type Certificate for Large Civil Aircraft Engine Lubricating System

The items in CCAR-25 related to CCAR-33 mainly appear in the E subpart of the CCAR-25 standards. As a representatively interconnecting system, there are great meanings and expected economic value for the TC application that the lubrication system verification be reasonably scheduled and maximum extent reviewed through both the aircraft OEM and the engine suppliers. Based on the requirement analysis of CCAR-25-R4 and CCAR-33-R2, this paper draws up a preliminary aircraft TC plan of lubrication system compliance by the five relationships of referencing, selecting, supplementing, resembling, and differing among the airworthiness standards to optimize the relevant conclusions in CCAR-33 compliance for CCAR-25 requirements during the type verification schedule state, and maximizes the use of validations and conclusions of the lubrication system in CCAR-33. The conclusions of the compliance activities are used to support the verification of the CCAR-25 requirements, expecting to provide reference and assistance for the aircraft design and type certification process.