{"schema_version":1,"airport":"NHK","entries":[{"cycle":"2026-02-19","from_cycle":"2026-01-22","id":"d8ae9d2608e2","priority":"fyi","category":"navaid","kind":"changed","summary":"NHK navaid: remark: DME UNUSBL 026-045 BYD 20 NM; 060-075; 076-090 BYD 15 NM; 135-170 BYD 15 NM; 171-190; 191-220 BYD 25 NM; 221-240 BYD 15 NM; 250-290 BYD 15 NM; 355-025. -> DME UNUSBL 026-045 BYD 20 NM; 076-090 BYD 15 NM; 135-170 BYD 15 NM; 191-220 BYD 25 NM; 221-240 BYD 15 NM; 250-290 BYD 15 NM.","source":"NAV_RMK","fields":[{"field":"REMARK","old":"DME UNUSBL 026-045 BYD 20 NM; 060-075; 076-090 BYD 15 NM; 135-170 BYD 15 NM; 171-190; 191-220 BYD 25 NM; 221-240 BYD 15 NM; 250-290 BYD 15 NM; 355-025.","new":"DME UNUSBL 026-045 BYD 20 NM; 076-090 BYD 15 NM; 135-170 BYD 15 NM; 191-220 BYD 25 NM; 221-240 BYD 15 NM; 250-290 BYD 15 NM."}]},{"cycle":"2026-02-19","from_cycle":"2026-01-22","id":"d944b15afe0b","priority":"fyi","category":"navaid","kind":"changed","summary":"NHK navaid: remark: TACAN AZM UNUSBL 026-045 BYD 20 NM; 060-075; 076-090 BYD 15 NM; 135-170 BYD 15 NM; 171-190; 191-220 BYD 25 NM; 221-240 BYD 15 NM; 250-290 BYD 15 NM; 355-025. -> TACAN AZM UNUSBL 026-045 BYD 20 NM; 060-075 BYD 12 NM BLW 2500 FT; 076-090 BYD 15 NM; 135-170 BYD 15 NM; 171-190 BYD 12 NM BLW 2500 FT; 191-220 BYD 25 NM; 221-240 BYD 15 NM; 250-290 BYD 15 NM; 322-332 BYD 12 NM BLW 2500 FT; 355-025 BYD 12 NM BLW 2500 FT.","source":"NAV_RMK","fields":[{"field":"REMARK","old":"TACAN AZM UNUSBL 026-045 BYD 20 NM; 060-075; 076-090 BYD 15 NM; 135-170 BYD 15 NM; 171-190; 191-220 BYD 25 NM; 221-240 BYD 15 NM; 250-290 BYD 15 NM; 355-025.","new":"TACAN AZM UNUSBL 026-045 BYD 20 NM; 060-075 BYD 12 NM BLW 2500 FT; 076-090 BYD 15 NM; 135-170 BYD 15 NM; 171-190 BYD 12 NM BLW 2500 FT; 191-220 BYD 25 NM; 221-240 BYD 15 NM; 250-290 BYD 15 NM; 322-332 BYD 12 NM BLW 2500 FT; 355-025 BYD 12 NM BLW 2500 FT."}]},{"cycle":"2026-01-22","from_cycle":"2025-12-25","id":"d77e5a59116a","priority":"action","category":"navaid","kind":"removed","summary":"NHK NDB (400) decommissioned/removed","source":"NAV_BASE"},{"cycle":"2026-01-22","from_cycle":"2025-12-25","id":"388317fc976d","priority":"action","category":"frequency","kind":"removed","summary":"frequency 400.0 (NHK NDB) removed","source":"FRQ"},{"cycle":"2026-01-22","from_cycle":"2025-12-25","id":"47aa3a65327e","priority":"ifr","category":"navaid","kind":"removed","summary":"removed navaid remark: UNUSBL BYD 10 NM.","source":"NAV_RMK","original":"UNUSBL BYD 10 NM."},{"cycle":"2025-08-07","from_cycle":"2025-07-10","id":"1e25678ac7b2","priority":"ifr","category":"route","kind":"changed","summary":"preferred IFR routes: 3 changed","source":"PFR","details":["preferred IFR route NHK -> BWI is now: NHK TRPOD CHOPS GRACO BWI","preferred IFR route NHK -> DCA is now: NHK TRPOD CHURK CAPKO DCA","preferred IFR route NHK -> ORF is now: NHK WHINO COLIN T291 FAGED STEIN ORF"]},{"cycle":"2024-12-26","from_cycle":"2024-11-28","id":"9b5fe15ba119","priority":"action","category":"airspace","kind":"changed","summary":"airspace is now:  (was: class d svc 1200-0400z++ mon-fri, 1300-2300z++ sat-sun, clsd hol; other times class e)","source":"CLS_ARSP","fields":[{"field":"AIRSPACE_HRS","old":"CLASS D SVC 1200-0400Z++ MON-FRI, 1300-2300Z++ SAT-SUN, CLSD HOL; OTHER TIMES CLASS E","new":""}]},{"cycle":"2024-12-26","from_cycle":"2024-11-28","id":"625c3b26f97f","priority":"fyi","category":"navaid","kind":"changed","summary":"NHK (Nas Patuxent River) navaid: common system usage: no -> yes","source":"NAV_BASE","fields":[{"field":"NAS_USE_FLAG","old":"N","new":"Y"}]},{"cycle":"2024-12-26","from_cycle":"2024-11-28","id":"4249e4711354","priority":"fyi","category":"remark","kind":"added","summary":"new remark: MISC: CLASS D AVAIL EXCLUDING THAT AIRSPACE WITHIN RESTRICTED AREAS R-4005 AND R-4007 WHEN ACTIVE.  SEE FLIP AP/1 SUPPLEMENTARY ARPT REMARKS.","source":"APT_RMK","original":"MISC: CLASS D AVAIL EXCLUDING THAT AIRSPACE WITHIN RESTRICTED AREAS R-4005 AND R-4007 WHEN ACTIVE.  SEE FLIP AP/1 SUPPLEMENTARY ARPT REMARKS."},{"cycle":"2024-12-26","from_cycle":"2024-11-28","id":"566378becb7f","priority":"fyi","category":"remark","kind":"changed","summary":"remark updated: MISC: FOR INFO REGARDING CIVIL AIR LANDING PERMITS (CALPS) CTC AFM AT 301-342-8923 OR EMAIL NASPATUXENTRIVERCALPS@US.NAVY.MIL.","source":"APT_RMK","original":"MISC: FOR INFO REGARDING CIVIL AIR LANDING PERMITS (CALPS) CTC AFM AT 301-342-8923 OR EMAIL NASPATUXENTRIVERCALPS@US.NAVY.MIL.","fields":[{"field":"REMARK","old":"CALPS: FOR INFO REGARD CIVIL AIR LANDING PERMITS CTC FPL AT 301-342-3836 OR EMAIL NASPATUXENTRIVERCALPS@US.NAVY.MIL.","new":"MISC: FOR INFO REGARDING CIVIL AIR LANDING PERMITS (CALPS) CTC AFM AT 301-342-8923 OR EMAIL NASPATUXENTRIVERCALPS@US.NAVY.MIL."}]}],"first_cycle":"2024-12-26","last_cycle":"2026-02-19"}