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At present,there are no relevant standards and specifications for the verification of civil aircraft maintenance manuals in China.It is urgent to carry out relevant research and establish a complete manual verification system as soon as possible.T his paper puts forward the technical requirements,operation process and implementation points of manual verification operation based on large number of maintenance manual verification work,which combined with the flight test modification work.Taking the aircraft maintenance manual verification procedure of flap high lift system and flap structural components as an example,this paper carries out the manual verification plan arrangement and verification implementation method design from the perspective of practical operation feasibility and time saving.The key elements of the verification plan and design of practical operation process are given.The key operate points and precautions for greater difficult flap removal and installation programs are given as example,and the summary of common maintenance problems and improvement methods are recommended.All these work put forward suggestions for the follow-up verification work.

Safety assessment on civil aircraft is one of the effective methods to realize the airworthiness of aircraft. Based on the principle and method of civil aircraft system safety design and assessment, a certain high lift system is taken as an example, and functional hazard analysis and fault tree analysis are carried out for the failure condition of 'flap asymmetry motion over limit', the critical factor affecting safety design are gained. By improving the design method of the critical factor, the system scheme which can meet the safety requirement is finally obtained. The results show that the system can meet the quantitative requirements of safety.