 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
B737-700 experienced track error on sea departure. Flight crew later discovers ACARS printout of pre departure clearance showed summa departure on the route clearance and seattle departure on the revised portion.
| Attributes | |
| ACN | 711692 |
| Time | |
| Date | 200610 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : sea.airport |
| State Reference | WA |
| Altitude | msl single value : 4500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : s46.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure sid : summa |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 250 flight time type : 5000 |
| ASRS Report | 711692 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : clearance non adherence : far non adherence : published procedure other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance controller : issued advisory |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft Chart Or Publication |
| Primary Problem | Chart Or Publication |
| Air Traffic Incident | Pilot Deviation |
Narrative:
When we received the ACARS clearance; it said summa six at the top; there was no alert at all about route change; then several lines below; it said seattle three. Both of us saw the summa six; but we did not see the seattle three below. We were questioned by departure when we turned right on the north departure; we told him that we were on the summa. He said to us a couple of minutes later that he had spoken to the tower and that we had been cleared on the seattle three. We said that we had not realized that; we apologized; and the controller said that there had been no harm done. From a human factors standpoint; it seems to be a potential trap to state the summa six at the top along with the change in route; especially since there was no alerting at all about a route change. We are all very accustomed on a lax bound flight to leave via the summa. But the suggestion notwithstanding; we must be more careful next time in reading the ACARS printout.
Original NASA ASRS Text
Title: B737-700 EXPERIENCED TRACK ERROR ON SEA DEP. FLT CREW LATER DISCOVERS ACARS PRINTOUT OF PDC SHOWED SUMMA DEP ON THE RTE CLRNC AND SEATTLE DEP ON THE REVISED PORTION.
Narrative: WHEN WE RECEIVED THE ACARS CLEARANCE; IT SAID SUMMA SIX AT THE TOP; THERE WAS NO ALERT AT ALL ABOUT ROUTE CHANGE; THEN SEVERAL LINES BELOW; IT SAID SEATTLE THREE. BOTH OF US SAW THE SUMMA SIX; BUT WE DID NOT SEE THE SEATTLE THREE BELOW. WE WERE QUESTIONED BY DEPARTURE WHEN WE TURNED RIGHT ON THE NORTH DEPARTURE; WE TOLD HIM THAT WE WERE ON THE SUMMA. HE SAID TO US A COUPLE OF MINUTES LATER THAT HE HAD SPOKEN TO THE TOWER AND THAT WE HAD BEEN CLEARED ON THE SEATTLE THREE. WE SAID THAT WE HAD NOT REALIZED THAT; WE APOLOGIZED; AND THE CONTROLLER SAID THAT THERE HAD BEEN NO HARM DONE. FROM A HUMAN FACTORS STANDPOINT; IT SEEMS TO BE A POTENTIAL TRAP TO STATE THE SUMMA SIX AT THE TOP ALONG WITH THE CHANGE IN ROUTE; ESPECIALLY SINCE THERE WAS NO ALERTING AT ALL ABOUT A ROUTE CHANGE. WE ARE ALL VERY ACCUSTOMED ON A LAX BOUND FLIGHT TO LEAVE VIA THE SUMMA. BUT THE SUGGESTION NOTWITHSTANDING; WE MUST BE MORE CAREFUL NEXT TIME IN READING THE ACARS PRINTOUT.
Data retrieved from NASA's ASRS site as of January 2009 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.