|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||1201 To 1800|
|Locale Reference||atc facility : sqa|
|Altitude||msl bound lower : 9000|
msl bound upper : 9000
|Controlling Facilities||artcc : zan|
|Operator||common carrier : air taxi|
|Make Model Name||Medium Large Transport|
|Flight Phase||cruise other|
|Route In Use||enroute airway : zan|
|Affiliation||government : faa|
|Function||controller : radar|
|Qualification||controller : radar|
|Function||controller : flight data|
|Qualification||controller : non radar|
|Anomaly||other anomaly other|
other anomaly other
|Independent Detector||other controllera|
|Resolutory Action||none taken : detected after the fact|
|Consequence||faa : investigated|
|Primary Problem||ATC Human Performance|
|Air Traffic Incident||Intra Facility Coordination Failure|
|ATC Facility||procedure or policy : unspecified|
This system deviation took place on 4/fri/88 when the aircraft departed aniak en route to anc and entered released military airspace. I was working the radar position, and the d-side cleared medium large transport to anc through a relay to bethel FSS. At the sector, we had information strips on the released military airspace showing the released altitudes of 100' AGL to FL500. Because of this, the aircraft had been given a restriction to maintain 9000' until sparrevohn, then climb to his requested altitude of 13000'. The aircraft reported reaching 9000' (radar identify was never given due to our radar coverage at low altitudes in that area) and was given communications instructions 40 mi northwest of sqa. I took a break at this time and, when I returned, was informed that medium large transport had entered the military airspace that was released 100' and above. Both myself and the d-side controller thought the 100 on the military information strip meant 10000', not 100'. Because sqa is in the next sector and medium large transport had the restriction to maintain 9000' till sqa, then climb to 13000', this information was coordinated with the next sector and had been approved (they had the same information on released airspace that we had). The problem was discovered when a controller working sqa sector questioned the actual altitudes released and found it was 100'. The military was called and gave anc ARTCC the airspace below 10000' since they had no traffic in the area at that time. I believe the situation occurred because of the way the information on the released airspace was written on the strip. We saw the airspace and restr for it appropriately based on the information 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.
Original NASA ASRS Text
Title: 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.
Data retrieved from NASA's ASRS site as of August 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.