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Flight crew deviated from the departure clearance when they misinterpreted the pre departure clearance revision of the original clearance.
| Attributes | |
| ACN | 791656 |
| Time | |
| Date | 200806 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : san.airport |
| State Reference | CA |
| Altitude | msl single value : 4000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : sct.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure sid : lnsay |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Experience | flight time last 90 days : 215 flight time type : 215 |
| ASRS Report | 791656 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : departure |
| Events | |
| Anomaly | non adherence : published procedure non adherence : clearance other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
The release was flagged 'non-standard route;' as the company had filed the LNSAY2.sxc. Of course the SANSMF01 route is the PEBLE3.sxc. I pulled up the pre departure clearance clearance and it read: -PEBLE3 sxc lax- san LNSAY2 sxc lax. I did not understand that the top line was a reroute of the filed clearance; so I understood the actual clearance to be the LNSAY2. We took off and reported to ATC that we were leveling 4000 ft (per the LNSAY2). The controller asked if we were on the PEBLE3 and we said no we were on the lnsay as that's what we were given by pre departure clearance. He immediately gave us a heading of 280 degrees; and a minute later cleared us direct to a point on the PEBLE3. No aircraft were near us at the time. Prior to this event I thought I clearly understood pre departure clearance clrncs. Obviously; I did not. I will now check more carefully and if there is any question; I will ask ATC. If this is becoming a trend item; perhaps we can find another way to more clearly indicate a pre departure clearance reroute in the clearance.
Original NASA ASRS Text
Title: FLT CREW DEVIATED FROM THE DEP CLRNC WHEN THEY MISINTERPRETED THE PDC REVISION OF THE ORIGINAL CLRNC.
Narrative: THE RELEASE WAS FLAGGED 'NON-STANDARD RTE;' AS THE COMPANY HAD FILED THE LNSAY2.SXC. OF COURSE THE SANSMF01 RTE IS THE PEBLE3.SXC. I PULLED UP THE PDC CLRNC AND IT READ: -PEBLE3 SXC LAX- SAN LNSAY2 SXC LAX. I DID NOT UNDERSTAND THAT THE TOP LINE WAS A REROUTE OF THE FILED CLRNC; SO I UNDERSTOOD THE ACTUAL CLRNC TO BE THE LNSAY2. WE TOOK OFF AND RPTED TO ATC THAT WE WERE LEVELING 4000 FT (PER THE LNSAY2). THE CTLR ASKED IF WE WERE ON THE PEBLE3 AND WE SAID NO WE WERE ON THE LNSAY AS THAT'S WHAT WE WERE GIVEN BY PDC. HE IMMEDIATELY GAVE US A HEADING OF 280 DEGS; AND A MINUTE LATER CLEARED US DIRECT TO A POINT ON THE PEBLE3. NO ACFT WERE NEAR US AT THE TIME. PRIOR TO THIS EVENT I THOUGHT I CLEARLY UNDERSTOOD PDC CLRNCS. OBVIOUSLY; I DID NOT. I WILL NOW CHECK MORE CAREFULLY AND IF THERE IS ANY QUESTION; I WILL ASK ATC. IF THIS IS BECOMING A TREND ITEM; PERHAPS WE CAN FIND ANOTHER WAY TO MORE CLEARLY INDICATE A PDC REROUTE IN THE CLRNC.
Data retrieved from NASA's ASRS site as of May 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.