15 Mar 2025 (ZYYJ) Yanji, PR of China — Chaoyangchuan — ALT/HEIGHT CONVERSION box on 11-1, 11-3 Notices & Alerts / (ZYYJ) Yanji, PR of China — Chaoyangchuan — ALT/HEIGHT CONVERSION box on 11-1, 11-3 Included Regions (1) China Included Areas (1) China The entry for (2700m) in ALT/HEIGHT CONVERSION box on Jeppesen charts 11-1 and 11-3 (both dated 17 JAN 25/Eff 22 Jan 1600Z) for Yanji, PR of China, Chaoyangchuan (ZYYJ) airport could be misunderstood. The issue is related to the source provided transition height (TH) of (2700m) which we have intentionally associated with the source provided TA value of 3000m, instead of simply converting the (2700m) into imperial number. The attached alert contains an explanation why the conversion was done this this way. ZYYJ_Chart Alert_14032025 Back to All Notices & Alerts