Aircraft’s owner or the operator who hold the Certificate of Airworthiness is vested with the responsibility of the proper maintenance of the aircraft and must comply with the requirements in performing checks and inspections before putting the aircraft into operation and maintain it in airworthy and safe operating conditions.
The aircraft is considered to be unairworthy and not safe to operate when one of the following conditions occurs:
1.Aircraft is found not to meet the initial airworthiness standards after the inspections by the CAA or its designated organization or agency.
2.Aircraft is unable to be operated safely due to the revelations that owner or the operator do not comply with the requirements to perform proper maintenance.
3.Aircraft is unable to be operated safely due to the revelations that owner or the operator do not comply with Airworthiness Directives published by the CAA, the Civil Aviation Authorities of State of Designor the State of Design of Modification.
4.Purpose of usage, performance, characteristics of aircraft is changed by owner or the operator without the approval from the CAA.
5.Aircraft is, except for maintenance purposes, grounded for more than 90 consecutive days.
Owner or operator shall prevent the aircraft from operation when it is considered to be unairworthy and not safe to operate.
For those who violate aforementioned provision, CAA shall revoke its Certificate of Airworthiness.

Except for the free balloons, It is required that aircraft must be weighed for basic empty weight and balance once every three years, the weighing schedule may be extended with the approval from the CAA under special circumstances, but the extension can not exceed 1 year.
Upon changes to the accumulation of basic empty weight of the aeroplane more than 0.5 percent of maximum landing weight or shifting of center of gravity more than 0.5 percent of mean aerodynamic chord, the aircraft shall be weighted. Upon changes to the basic empty weight of the helicopter more than 0.5 percent of maximum landing weight, the aircraft shall be weighted.
In the case when the center of gravity or weight of the aircraft is changed after the completion of the above-mentioned weighing process, owner or operator is required to have their relevant weight and balance manuals revised to be in accordance with Aircraft Flight Operation Regulations.

Aircraft major repair or major alteration must be performed in accordance with data approved by CAA. This requirement does not apply to any of these works done in compliance with the Airworthiness Directive issued by the CAA ,the aviation authorities of State of Design or the State of Design of Modification.
Owner or operator who intends to fabricate the part for maintaining his own aircraft shall submit the fabrication procedures to CAA for approval.
Unless the part is fabricated in accordance with CAA accepted data, no person can install that part onto aircraft.

When performing maintenance, preventive maintenance, rebuilding, alteration or configuration to aircraft, its powerplant, propeller, component or part, Aircraft owner or operator shall not use the part which might not properly maintained, un-repairable or bogus part announced by manufacturer or the aviation authorities.

Inspections of aircraft should follow the following procedure:
1. Aircraft should be clean and unloaded, screw loose all inspection bulkheads and covers.
2. Complete all maintenance, preventive maintenance and history records and work reports.
3. For certifying airworthiness, the CAA may consider it necessary to demand a function check flight. The report and record of such flight should be forwarded to the CAA.

When an aircraft has sustained damage, the owner or operator shall judge whether the damage is of a nature such that the aircraft is still airworthiness as defined by the appropriate airworthiness requirements. The aircraft shall be allowed to resume its flight upon granted by CAA. When CAA considers that the damage sustained is of a nature such that the aircraft is no longer airworthy, owner or operator may apply a special flight permit from CAA to fly without fare-paying passengers to an aerodrome at which it will be restored to an airworthy condition.
If the damage is sustained or ascertained when the aircraft is in the territory of another State, owner or operator shall advise the local aviation authority and CAA.

Aircraft must have complete aircraft, structure, powerplant, and propeller historic record and log book.
All entries should be completed within 30 days of the completion of the jobs.
The up-keeping and replacement of the record books and log referred to the paragraph 1 of this Article should follow the following procedure:
1.When using a new book to replace the used one, the used book should be kept and its conclusive data and a summary of major events be transferred to the new book.
2.Aircraft, aircraft engine or propeller, in the event of destroyed beyond repair, salvaged or permanently grounded, its record book should be kept for 2 years by the owner or operator after the date of the happening.
Aircraft owner or operator, upon approved by CAA, may use electronic record keeping system or other more precise and effective means for record management in place of record books or log required by this Article.

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The owner or operator shall ensure that in respect of aircraft, its powerplant, propeller, component or part, there exists a system whereby information on faults, malfunctions, defects and other occurrences that cause or might cause adverse effects on the continuing airworthiness of the aircraft is transmitted to the CAA within 72 hours and organization responsible for the type design of that aircraft. If necessary, inform the authority of State of design.

The aircraft owner or operator shall comply with Airworthiness Directives issued by the CAA , the aeronautics authority of the State of design or the State of Design of Modification of the aviation products, appliances and parts, and take all necessary action thereto.
The aircraft owner or operator may use an alternate mean to comply with requirements of Airworthiness Directives when it is approved by CAA.