Atx light transport on EMS flight follows wrong track.

Attributes
ACN	104842
Time
Date	198902
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : ont
State Reference	CA
Altitude	msl bound lower : 5000 msl bound upper : 7000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : ont tower : see
Operator	common carrier : air taxi
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Route In Use	departure other departure sid : sid
Flight Plan	IFR
Person 1
Affiliation	company : air taxi
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 3000 flight time type : 70
ASRS Report	104842
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	altitude deviation : overshoot non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

As second officer on this flight I received the IFR clearance and read back what I thought to be: pom 2 direct trm direct pke af M70 410, 135.4. As we departed runway 26R and were turned over to departure control, I reported that light transport was climbing to 7000' on a 255 degree heading. The departure control came back and told us to turn left we were on the wrong SID, and were supposed to be using the prado 2 departure. As we changed our heading to a left turn, he also told us we were only cleared to 5000', but since we were climbing through 5000' to go ahead to 7000' via the prado 2 departure. This misunderstanding caused us and the controller a brief period of confusion. If our clearance was incorrect, then captain was unaware of this fact and was flying what I had given him. I also believed we were flying the proper clearance. I think that having a pomona 2 and prado 2 SID, sound to close and should be changed.

Original NASA ASRS Text

Title: ATX LTT ON EMS FLT FOLLOWS WRONG TRACK.

Narrative: AS S/O ON THIS FLT I RECEIVED THE IFR CLRNC AND READ BACK WHAT I THOUGHT TO BE: POM 2 DIRECT TRM DIRECT PKE AF M70 410, 135.4. AS WE DEPARTED RWY 26R AND WERE TURNED OVER TO DEP CTL, I RPTED THAT LTT WAS CLBING TO 7000' ON A 255 DEG HDG. THE DEP CTL CAME BACK AND TOLD US TO TURN LEFT WE WERE ON THE WRONG SID, AND WERE SUPPOSED TO BE USING THE PRADO 2 DEP. AS WE CHANGED OUR HDG TO A LEFT TURN, HE ALSO TOLD US WE WERE ONLY CLRED TO 5000', BUT SINCE WE WERE CLBING THROUGH 5000' TO GO AHEAD TO 7000' VIA THE PRADO 2 DEP. THIS MISUNDERSTANDING CAUSED US AND THE CTLR A BRIEF PERIOD OF CONFUSION. IF OUR CLRNC WAS INCORRECT, THEN CAPT WAS UNAWARE OF THIS FACT AND WAS FLYING WHAT I HAD GIVEN HIM. I ALSO BELIEVED WE WERE FLYING THE PROPER CLRNC. I THINK THAT HAVING A POMONA 2 AND PRADO 2 SID, SOUND TO CLOSE AND SHOULD BE CHANGED.

Data retrieved from NASA's ASRS site as of August 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.