Aircraft Flight Operation Regulations Article 305
No person may operate any automatic pressure altitude reporting equipment associated with an ATC transponder:1. When deactivation of that equipment is directed by air traffic services unit;2. Unless, as installed, that equipment was tested and calibrated to transmit altitude data corresponding within 125 feet (on a 95 percent probability basis) of the indicated or calibrated datum of the altimeter normally used to maintain flight altitude, with that altimeter referenced to 1013.25 hPa of pressure for altitudes from sea level to the maximum operating altitude of the aircraft; and3. Unless the altimeters and digitizers in that equipment meet the standards as set forth in Article 23, paragraph 1 of the Act.
中文原文 航空器飛航作業管理規則第305條
航管雷達迴波器之自動氣壓高度報告系統，應符合下列規定：
一、未經飛航管制機構指示，不得解除該裝置。
二、該裝置經校正及測試，自海平面至航空器最大作業高度，應以一千零十三點二五百帕壓力為基準，其發射高度資料及指示高度間之誤差應於一百二十五呎之內，該指示或校正高度通常使用於保持飛航高度。
三、該裝置之高度表及其數位編碼器，應符合民航局依本法第二十三條第一項核定採用國際間通用之適航標準。
一、未經飛航管制機構指示，不得解除該裝置。
二、該裝置經校正及測試，自海平面至航空器最大作業高度，應以一千零十三點二五百帕壓力為基準，其發射高度資料及指示高度間之誤差應於一百二十五呎之內，該指示或校正高度通常使用於保持飛航高度。
三、該裝置之高度表及其數位編碼器，應符合民航局依本法第二十三條第一項核定採用國際間通用之適航標準。