Flight crew deviated from the departure clearance when they misinterpreted the pre departure clearan...

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.

Flight crew deviated from the departure clearance when they misinterpreted the pre departure clearance revision of the original clearance.