PIC of air carrier mdt makes a casual, directed radio call on approach frequency which confused approach controller and could have caused an operational deviation.

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Attributes
ACN	140846
Time
Date	199003
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : jax
State Reference	FL
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Medium Transport, High Wing, 2 Turboprop Eng
Flight Phase	ground : holding
Flight Plan	IFR
Aircraft 2
Operator	general aviation : corporate
Make Model Name	Small Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach
Route In Use	arrival other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 210 flight time total : 13500 flight time type : 2100
ASRS Report	140846
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	non adherence other
Independent Detector	other controllera other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Jax approach advised the crew of an small transport jet that when he had malcom mckinnon airport in sight, he could cancel in the air or on the ground at mckinnon airport. I transmitted 5 seconds later 'or you could cancel now'. Jax approach must not have heard the entire transmission and asked the small transport crew if he was cancelling. The small transport crew said 'negative' and jax approach asked another aircraft if he had made the transmission to which the pilot of the other aircraft replied no. The controller apparently thought it was an unsolicited false cancellation. At this time my flight was cleared for takeoff right after the small transport crew cancelled his IFR clearance. I was going to advise the controller that I had made the transmission of question but decided to clarify after our departure. My intention was to suggest to the small transport crew if he would cancel IFR, we could be released IFR. After departure we were busy flying the aircraft and complying with the departure clearance and with no further queries from the controller, I forgot about trying to clarify what I had actually said.

Original NASA ASRS Text

Title: PIC OF ACR MDT MAKES A CASUAL, DIRECTED RADIO CALL ON APCH FREQ WHICH CONFUSED APCH CTLR AND COULD HAVE CAUSED AN OPDEV.

Narrative: JAX APCH ADVISED THE CREW OF AN SMT JET THAT WHEN HE HAD MALCOM MCKINNON ARPT IN SIGHT, HE COULD CANCEL IN THE AIR OR ON THE GND AT MCKINNON ARPT. I TRANSMITTED 5 SECS LATER 'OR YOU COULD CANCEL NOW'. JAX APCH MUST NOT HAVE HEARD THE ENTIRE XMISSION AND ASKED THE SMT CREW IF HE WAS CANCELLING. THE SMT CREW SAID 'NEGATIVE' AND JAX APCH ASKED ANOTHER ACFT IF HE HAD MADE THE XMISSION TO WHICH THE PLT OF THE OTHER ACFT REPLIED NO. THE CTLR APPARENTLY THOUGHT IT WAS AN UNSOLICITED FALSE CANCELLATION. AT THIS TIME MY FLT WAS CLRED FOR TKOF RIGHT AFTER THE SMT CREW CANCELLED HIS IFR CLRNC. I WAS GOING TO ADVISE THE CTLR THAT I HAD MADE THE XMISSION OF QUESTION BUT DECIDED TO CLARIFY AFTER OUR DEP. MY INTENTION WAS TO SUGGEST TO THE SMT CREW IF HE WOULD CANCEL IFR, WE COULD BE RELEASED IFR. AFTER DEP WE WERE BUSY FLYING THE ACFT AND COMPLYING WITH THE DEP CLRNC AND WITH NO FURTHER QUERIES FROM THE CTLR, I FORGOT ABOUT TRYING TO CLARIFY WHAT I HAD ACTUALLY SAID.

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.