{"schema_version":1,"airport":"4MD","entries":[{"cycle":"2026-10-01","from_cycle":"2026-09-03","engine":"1.3.8","id":"0d018a3ff124","priority":"fyi","category":"airport","kind":"changed","summary":"NOTAM facility: DCA -> 4MD","source":"APT_BASE","fields":[{"field":"NOTAM_ID","old":"DCA","new":"4MD"}]},{"cycle":"2026-08-06","from_cycle":"2026-07-09","id":"7b6698758a80","priority":"fyi","category":"weather","kind":"added","summary":"new weather station: AWOS-3PT (4MD)","source":"AWOS","fields":[{"field":"ASOS_AWOS_ID","old":"","new":"4MD"},{"field":"ASOS_AWOS_TYPE","old":"","new":"AWOS-3PT"},{"field":"NAVAID_FLAG","old":"","new":"N"}]},{"cycle":"2026-08-06","from_cycle":"2026-07-09","id":"7e2b68468638","priority":"action","category":"frequency","kind":"added","summary":"frequency 133.45 (4MD AWOS-3PT) added","source":"FRQ"},{"cycle":"2025-06-12","from_cycle":"2025-05-15","id":"79b1b5573458","priority":"fyi","category":"runway","kind":"changed","summary":"runway H1: runway end elevation: none -> 16 ft MSL","source":"APT_RWY_END","fields":[{"field":"RWY_END_ELEV","old":"","new":"16"}]},{"cycle":"2024-11-28","from_cycle":"2024-10-31","id":"be803bdae981","priority":"fyi","category":"remark","kind":"added","summary":"new remark: Pier markings are fading, chipping, with minimal glass beads.","source":"APT_RMK","original":"PIER MARKINGS - FADING, CHIPPING, MINIMAL GLASS BEADS."},{"cycle":"2024-11-28","from_cycle":"2024-10-31","id":"497e2df7f506","priority":"fyi","category":"runway","kind":"changed","summary":"runway H1: markings now in poor condition","source":"APT_RWY_END","fields":[{"field":"RWY_MARKING_COND","old":"FAIR","new":"POOR"}]}],"first_cycle":"2024-11-28","last_cycle":"2026-10-01"}