PA28 instructor and student landed at the wrong airport that was tower controled without clearance.

Attributes
ACN	571527
Time
Date	200301
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : gpm.airport
State Reference	TX
Altitude	msl bound lower : 0 msl bound upper : 2500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : gpm.tower
Operator	general aviation : instructional
Make Model Name	PA-28 Cherokee/Archer II/Dakota/Pillan/Warrior
Operating Under FAR Part	Part 91
Flight Phase	landing : touch and go
Flight Plan	None
Person 1
Affiliation	other
Function	instruction : instructor oversight : pic
Qualification	pilot : multi engine pilot : instrument pilot : commercial pilot : cfi
Experience	flight time last 90 days : 200 flight time total : 900 flight time type : 400
ASRS Report	571527
Person 2
Affiliation	other
Function	instruction : trainee
Events
Anomaly	airspace violation : entry incursion : landing without clearance non adherence : far non adherence : published procedure other anomaly other other spatial deviation
Independent Detector	other controllera other flight crewa other flight crewb
Resolutory Action	flight crew : became reoriented flight crew : exited penetrated airspace none taken : detected after the fact
Supplementary
Problem Areas	Chart Or Publication Flight Crew Human Performance Airspace Structure
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

My student and I departed ads with a class B clearance to rbd. After completion of a touch-and-go at rbd, we requested to proceed to gky. We were told to proceed 'on course.' moments later, we received 'radar service terminated, squawk VFR, frequency change approved.' I was expecting a handoff to gpm tower. The dfw VFR sectional does not depict the boundaries or presence of class D airspace at gpm. I was unsure, so I called gpm tower to inform them of our location. Gpm tower replied 'transition approved,' then 'you may now change to arlington frequency.' at this point, I assumed the airport directly in front of us was gky CTAF and proceeded to execute a 'touch-and-go.' as we lifted off, I received a sinking feeling when I read the sign reading 'welcome to grand prairie.' we immediately turned and proceeded south out of any possibility of D airspace. A moment later, a male voice came over gky frequency and said 'aircraft that just departed gpm, what is your tail number?' we did not reply! Questions: because the current dfw sectional does not show segmented blue lines, is it class D? Were we in violation? If it is, in fact, class D airspace, did our earlier contact fulfill the requirements of 'establish communications,' and if so, did we need a clearance to land?

Original NASA ASRS Text

Title: PA28 INSTRUCTOR AND STUDENT LANDED AT THE WRONG ARPT THAT WAS TWR CTLED WITHOUT CLRNC.

Narrative: MY STUDENT AND I DEPARTED ADS WITH A CLASS B CLRNC TO RBD. AFTER COMPLETION OF A TOUCH-AND-GO AT RBD, WE REQUESTED TO PROCEED TO GKY. WE WERE TOLD TO PROCEED 'ON COURSE.' MOMENTS LATER, WE RECEIVED 'RADAR SVC TERMINATED, SQUAWK VFR, FREQ CHANGE APPROVED.' I WAS EXPECTING A HDOF TO GPM TWR. THE DFW VFR SECTIONAL DOES NOT DEPICT THE BOUNDARIES OR PRESENCE OF CLASS D AIRSPACE AT GPM. I WAS UNSURE, SO I CALLED GPM TWR TO INFORM THEM OF OUR LOCATION. GPM TWR REPLIED 'TRANSITION APPROVED,' THEN 'YOU MAY NOW CHANGE TO ARLINGTON FREQ.' AT THIS POINT, I ASSUMED THE ARPT DIRECTLY IN FRONT OF US WAS GKY CTAF AND PROCEEDED TO EXECUTE A 'TOUCH-AND-GO.' AS WE LIFTED OFF, I RECEIVED A SINKING FEELING WHEN I READ THE SIGN READING 'WELCOME TO GRAND PRAIRIE.' WE IMMEDIATELY TURNED AND PROCEEDED S OUT OF ANY POSSIBILITY OF D AIRSPACE. A MOMENT LATER, A MALE VOICE CAME OVER GKY FREQ AND SAID 'ACFT THAT JUST DEPARTED GPM, WHAT IS YOUR TAIL NUMBER?' WE DID NOT REPLY! QUESTIONS: BECAUSE THE CURRENT DFW SECTIONAL DOES NOT SHOW SEGMENTED BLUE LINES, IS IT CLASS D? WERE WE IN VIOLATION? IF IT IS, IN FACT, CLASS D AIRSPACE, DID OUR EARLIER CONTACT FULFILL THE REQUIREMENTS OF 'ESTABLISH COMS,' AND IF SO, DID WE NEED A CLRNC TO LAND?

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.