Cargo air carrier has stuck microphone for 15 mins on oceanic flight.

Attributes
ACN	201808
Time
Date	199202
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : rjtg
State Reference	FO
Altitude	msl bound lower : 35000 msl bound upper : 35000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Widebody, Low Wing, 4 Turbojet Eng
Flight Phase	cruise other
Route In Use	enroute airway : a590
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp
Experience	flight time total : 31000
ASRS Report	201808
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : atp
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	other controllera
Resolutory Action	flight crew : overcame equipment problem
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

En route rjaa-rpmm, over position guleg on airway A590, south of miyakejima, first officer called tokyo control for routine position report on 125.9 and was informed by tokyo control 'that for the previous 15 min we have had an open microphone.' we checked all cockpit microphones and did not locate the offending unit. We checked several times with ATC for proper microphone operating and it did not repeat.

Original NASA ASRS Text

Title: CARGO ACR HAS STUCK MIC FOR 15 MINS ON OCEANIC FLT.

Narrative: ENRTE RJAA-RPMM, OVER POS GULEG ON AIRWAY A590, S OF MIYAKEJIMA, FO CALLED TOKYO CTL FOR ROUTINE POS RPT ON 125.9 AND WAS INFORMED BY TOKYO CTL 'THAT FOR THE PREVIOUS 15 MIN WE HAVE HAD AN OPEN MICROPHONE.' WE CHKED ALL COCKPIT MICROPHONES AND DID NOT LOCATE THE OFFENDING UNIT. WE CHKED SEVERAL TIMES WITH ATC FOR PROPER MICROPHONE OPERATING AND IT DID NOT REPEAT.

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.