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Altitude change missed by the flight crew of a DC10-30 during a rerte over the northern control area of eastern canada on frequency with czeg, ab.
| Attributes | |
| ACN | 546617 |
| Time | |
| Date | 200205 |
| Day | Wed |
| Place | |
| State Reference | AB |
| Altitude | msl single value : 34000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : czeg.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | DC-10 30F |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 26000 flight time type : 2000 |
| ASRS Report | 546617 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : instrument pilot : flight engineer pilot : atp pilot : commercial |
| Experience | flight time last 90 days : 200 flight time total : 25000 flight time type : 1200 |
| ASRS Report | 546688 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued advisory flight crew : became reoriented other |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | Airspace Structure Chart Or Publication Flight Crew Human Performance ATC Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
| Situations | |
| Publication | CA 3-4 HI ALT |
Narrative:
No conflicts or separation problem. We received our original clearance (oceanic) from iceland radio. We were to get FL350 but were only given FL340. Approaching 070A, we were given a rerte clearance in latitude/longitude evidently due to a chart latitude/longitude error. We had difficulty understanding the order of the coordinates and had to read back several times. We then updated our INS with the new clearance. Several mins after the controller asked us for our 070A report. We gave it and she asked our altitude. We said FL340. She said we were to climb to FL350 and reissued the climb clearance. We did and the incident was over. We use a plotting chart for these long flts along with hi charts. This was a difficult rerte and it occurred as we approached a reporting point. The controller issued the clearance as 68-80W, 66-90W and I copied 6880N-6690W (wrong!). We got it straight with a couple of readbacks. Also, in the clearance was an intersection on the ca hi 1-2 not on the ca hi 3-4. Also on the ca hi 3-4, 080A and 080B have the same latitude/longitude which is the reason for the rerte clearance. We had no way to know this. It all worked out and I am going to try to improve my ability to assimilate latitude/longitude references to our position. Also, I've heard references to intxns as 070A, N6930-WO7000, N6930-702, etc. When you get a rerte sometimes it is hard to figure what you're getting. Also, jumping from chart to chart to chart does not help. Our rerte was 6930W-07000W, 68N-80W, 66N-90W, 63N-100W, advex intersection, as filed. Supplemental information from acn 546688: the latitude/longitude information was different for the same point on different charts. Artic radio issued the rerte and altitude clearance change and wanted a position report. Chart confusion and poor reception on radio added to workload.
Original NASA ASRS Text
Title: ALT CHANGE MISSED BY THE FLC OF A DC10-30 DURING A RERTE OVER THE NORTHERN CTL AREA OF EASTERN CANADA ON FREQ WITH CZEG, AB.
Narrative: NO CONFLICTS OR SEPARATION PROB. WE RECEIVED OUR ORIGINAL CLRNC (OCEANIC) FROM ICELAND RADIO. WE WERE TO GET FL350 BUT WERE ONLY GIVEN FL340. APCHING 070A, WE WERE GIVEN A RERTE CLRNC IN LATITUDE/LONGITUDE EVIDENTLY DUE TO A CHART LATITUDE/LONGITUDE ERROR. WE HAD DIFFICULTY UNDERSTANDING THE ORDER OF THE COORDINATES AND HAD TO READ BACK SEVERAL TIMES. WE THEN UPDATED OUR INS WITH THE NEW CLRNC. SEVERAL MINS AFTER THE CTLR ASKED US FOR OUR 070A RPT. WE GAVE IT AND SHE ASKED OUR ALT. WE SAID FL340. SHE SAID WE WERE TO CLB TO FL350 AND REISSUED THE CLB CLRNC. WE DID AND THE INCIDENT WAS OVER. WE USE A PLOTTING CHART FOR THESE LONG FLTS ALONG WITH HI CHARTS. THIS WAS A DIFFICULT RERTE AND IT OCCURRED AS WE APCHED A RPTING POINT. THE CTLR ISSUED THE CLRNC AS 68-80W, 66-90W AND I COPIED 6880N-6690W (WRONG!). WE GOT IT STRAIGHT WITH A COUPLE OF READBACKS. ALSO, IN THE CLRNC WAS AN INTXN ON THE CA HI 1-2 NOT ON THE CA HI 3-4. ALSO ON THE CA HI 3-4, 080A AND 080B HAVE THE SAME LATITUDE/LONGITUDE WHICH IS THE REASON FOR THE RERTE CLRNC. WE HAD NO WAY TO KNOW THIS. IT ALL WORKED OUT AND I AM GOING TO TRY TO IMPROVE MY ABILITY TO ASSIMILATE LATITUDE/LONGITUDE REFS TO OUR POS. ALSO, I'VE HEARD REFS TO INTXNS AS 070A, N6930-WO7000, N6930-702, ETC. WHEN YOU GET A RERTE SOMETIMES IT IS HARD TO FIGURE WHAT YOU'RE GETTING. ALSO, JUMPING FROM CHART TO CHART TO CHART DOES NOT HELP. OUR RERTE WAS 6930W-07000W, 68N-80W, 66N-90W, 63N-100W, ADVEX INTXN, AS FILED. SUPPLEMENTAL INFO FROM ACN 546688: THE LATITUDE/LONGITUDE INFO WAS DIFFERENT FOR THE SAME POINT ON DIFFERENT CHARTS. ARTIC RADIO ISSUED THE RERTE AND ALT CLRNC CHANGE AND WANTED A POS RPT. CHART CONFUSION AND POOR RECEPTION ON RADIO ADDED TO WORKLOAD.
Data retrieved from NASA's ASRS site as of July 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.