No person may operate an airplane, or helicopter, in controlled airspace under IFR unless:1. Within the preceding 24 calendar months, each static pressure system, each altimeter instrument, and each automatic pressure altitude reporting system has been tested and inspected and found to comply with requirements in Attachment 29.2. Except for the use of system drain and alternate static pressure valves, following any opening and closing of the static pressure system, that system has been tested and inspected, and comply with requirements in Attachment 29 and Attachment 303. Following installation or maintenance on the automatic pressure altitude reporting system of the ATC transponder where data correspondence error could be introduced, the integrated system has been tested, inspected, and found to comply with Attachment 29.The tests required by the preceding paragraph of this article must be conducted by:1. The manufacturer of the airplane, or helicopter, on which the tests and inspections are to be performed;2. A certificated repair station properly equipped to perform those functions and holding:a) An instrument rating, Class I, or a limited instrument rating appropriate to the make and model of appliance to be tested; orb) A limited rating appropriate to the test to be performed; or3. An airframe rating appropriate to the airplane, or helicopter, to be tested; or4. A CAA approved aircraft maintenance engineer with B2 rating certificate.Altimeter and altitude reporting equipment approved under Article 23, paragraph 1 of the Act is considered to be tested and inspected as of the date of their manufacture.No person may operate an airplane, or helicopter, in controlled airspace under IFR at an altitude above the maximum altitude at which all altimeters and the automatic altitude reporting system of that airplane, or helicopter, have been tested.ATTACHMENT 29 Altimeter System Test and Inspection.pdfATTACHMENT 30 ATC Transponder Tests and Inspections.pdf