MLG WAS CLEARED THROUGH RELEASED AIRSPACE WITHOUT COORD WITH MILFAC. CONFUSING INTRAFAC COORD CREATED THE OCCURRENCE.

1988-04 · NASA ASRS report 86139

Date: 1988-04 · Aircraft: Medium Large Transport

Anomalies: other-airspace-violation-entry-or-exit|other-unspecified

Synopsis

MLG WAS CLEARED THROUGH RELEASED AIRSPACE WITHOUT COORD WITH MILFAC. CONFUSING INTRAFAC COORD CREATED THE OCCURRENCE.

Narrative

THIS SYS DEVIATION TOOK PLACE ON 4/FRI/88 WHEN THE ACFT DEPARTED ANIAK ENRTE TO ANC AND ENTERED RELEASED MIL AIRSPACE. I WAS WORKING THE RADAR POS; AND THE D-SIDE CLRED MLG TO ANC THROUGH A RELAY TO BETHEL FSS. AT THE SECTOR; WE HAD INFO STRIPS ON THE RELEASED MIL AIRSPACE SHOWING THE RELEASED ALTS OF 100' AGL TO FL500. BECAUSE OF THIS; THE ACFT HAD BEEN GIVEN A RESTRICTION TO MAINTAIN 9000' UNTIL SPARREVOHN; THEN CLB TO HIS REQUESTED ALT OF 13000'. THE ACFT RPTED REACHING 9000' (RADAR IDENT WAS NEVER GIVEN DUE TO OUR RADAR COVERAGE AT LOW ALTS IN THAT AREA) AND WAS GIVEN COMS INSTRUCTIONS 40 MI NW OF SQA. I TOOK A BREAK AT THIS TIME AND; WHEN I RETURNED; WAS INFORMED THAT MLG HAD ENTERED THE MIL AIRSPACE THAT WAS RELEASED 100' AND ABOVE. BOTH MYSELF AND THE D-SIDE CTLR THOUGHT THE 100 ON THE MIL INFO STRIP MEANT 10000'; NOT 100'. BECAUSE SQA IS IN THE NEXT SECTOR AND MLG HAD THE RESTRICTION TO MAINTAIN 9000' TILL SQA; THEN CLB TO 13000'; THIS INFO WAS COORDINATED WITH THE NEXT SECTOR AND HAD BEEN APPROVED (THEY HAD THE SAME INFO ON RELEASED AIRSPACE THAT WE HAD). THE PROB WAS DISCOVERED WHEN A CTLR WORKING SQA SECTOR QUESTIONED THE ACTUAL ALTS RELEASED AND FOUND IT WAS 100'. THE MIL WAS CALLED AND GAVE ANC ARTCC THE AIRSPACE BELOW 10000' SINCE THEY HAD NO TFC IN THE AREA AT THAT TIME. I BELIEVE THE SITUATION OCCURRED BECAUSE OF THE WAY THE INFO ON THE RELEASED AIRSPACE WAS WRITTEN ON THE STRIP. WE SAW THE AIRSPACE AND RESTR FOR IT APPROPRIATELY BASED ON THE INFO WE HAD BEFORE US. THE MISSION IS CONTINUING; AND SINCE THIS OCCURRENCE; THE AIRSPACE STRIPS HAVE BEEN CHANGED FROM 100/500 TO 001/500; WHICH HAS TAKEN CARE OF ANY CONFUSION.

Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.

Loading the flight search…

Frequently asked questions

How do I search flights by aircraft type on FlightFinder?

Pick an aircraft model — Boeing 737, Airbus A320, A380, Boeing 787 Dreamliner and more — enter your origin airport, and FlightFinder shows every route that plane flies from there with live fares.

Which aircraft types can I filter by?

We support Boeing 737/747/757/767/777/787, the full Airbus A220/A319/A320/A321/A330/A340/A350/A380 family, Embraer E170/E175/E190/E195, Bombardier CRJ and Dash 8, and the ATR 42/72 turboprops.

Is FlightFinder free to use?

Search and schedules are free. Pro ($4.99/month, $39/year, or $99 one-time lifetime) unlocks the enriched flight card — on-time stats, CO₂ per passenger, amenities, live gate & weather — plus My Trips with push alerts.

Where does the route data come from?

Live schedules come from Amadeus, AeroDataBox and Travelpayouts. Observed routes (which aircraft actually flew a given city pair) are crowdsourced from adsb.lol ADS-B data under the Open Database License.