Departing sjd, first officer, air carrier flight crew misinterp sjd tower phraseology and initiate an on course, direct routing climb. When on mmzt frequency, mmzt questions observed route and reclrs flight crew back onto filed route of flight.

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Attributes
ACN	428763
Time
Date	199902
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mmsd.airport
State Reference	FO
Altitude	msl single value : 8000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : mmzt.artcc
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	other vortac
Flight Phase	climbout : intermediate altitude
Route In Use	departure : other published ifr departure enroute airway : uj9.airway
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 40 flight time total : 5000 flight time type : 2000
ASRS Report	428763
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : multi engine
Events
Anomaly	non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance flight crew : returned to intended course
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance
Primary Problem	Ambiguous

Narrative:

Departing cabo, mexico, to los angeles, ca, we received our clearance with some confusion from sjd tower, just prior to departure. Our paperwork had us cleared from sjd to lax via marux intersection (sjd 003/047), lap, UJ9 to julian, julian arrival to lax. We were told cleared 'on course as filed.' passing about 8000 ft MSL, we were asked if we were established on the 320 degree radial (the direct lap routing). We replied we were proceeding direct to marux as filed. We were told to intercept the 320 degree radial to lap. It was further clarified to go lap-UJ9, julian 'as filed.' so the departure routing from sjd to lap was the big question. Our paperwork had one routing and cabo departure was expecting something different. This was brought up to our dispatch.

Original NASA ASRS Text

Title: DEPARTING SJD, FO, ACR FLC MISINTERP SJD TWR PHRASEOLOGY AND INITIATE AN ON COURSE, DIRECT ROUTING CLB. WHEN ON MMZT FREQ, MMZT QUESTIONS OBSERVED RTE AND RECLRS FLC BACK ONTO FILED RTE OF FLT.

Narrative: DEPARTING CABO, MEXICO, TO LOS ANGELES, CA, WE RECEIVED OUR CLRNC WITH SOME CONFUSION FROM SJD TWR, JUST PRIOR TO DEP. OUR PAPERWORK HAD US CLRED FROM SJD TO LAX VIA MARUX INTXN (SJD 003/047), LAP, UJ9 TO JULIAN, JULIAN ARR TO LAX. WE WERE TOLD CLRED 'ON COURSE AS FILED.' PASSING ABOUT 8000 FT MSL, WE WERE ASKED IF WE WERE ESTABLISHED ON THE 320 DEG RADIAL (THE DIRECT LAP ROUTING). WE REPLIED WE WERE PROCEEDING DIRECT TO MARUX AS FILED. WE WERE TOLD TO INTERCEPT THE 320 DEG RADIAL TO LAP. IT WAS FURTHER CLARIFIED TO GO LAP-UJ9, JULIAN 'AS FILED.' SO THE DEP ROUTING FROM SJD TO LAP WAS THE BIG QUESTION. OUR PAPERWORK HAD ONE ROUTING AND CABO DEP WAS EXPECTING SOMETHING DIFFERENT. THIS WAS BROUGHT UP TO OUR DISPATCH.

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.