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… Canadian Aviation Regulations (CARs) 2019-1 Standard 621 - Obstruction Marking and Lighting Amendment Foreword … the date of publication. 3. CANCELLATION. Standard 621, Obstruction Marking and Lighting, 1st Edition, dated 31 … subject to specific evaluation. Section 4.7. Monitoring of Obstruction Lights. Significantly revised to put the onus of …
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