C650 was cleared to back-taxi into position and, while doing so, they accidentally changed from tower frequency to departure control. They discovered their mistake, but not until after one arrival had to be changed to a different runway.

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Attributes
ACN	358680
Time
Date	199701
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : bdr
State Reference	CT
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : bkl
Operator	general aviation : corporate
Make Model Name	Citation III, VI, VII
Operating Under FAR Part	Part 91
Flight Phase	ground : holding ground other : taxi
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : cfi pilot : atp pilot : instrument pilot : commercial
Experience	flight time last 90 days : 95 flight time total : 8900 flight time type : 1150
ASRS Report	358680
Person 2
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : instrument pilot : atp
Events
Anomaly	non adherence : far non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance
Consequence	faa : reviewed incident with flight crew Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

On bdr tower frequency, we were instructed to back-taxi into position and hold runway 29 (back-taxi distance is approximately 1000 ft). While completing the remainder of the 'line-up' items on the checklist, we set in the assigned departure frequency on the standby side. Then we accidentally switched the button from standby to active. As we were starting the 180 degree turn into position, we were discussing the other aircraft in the traffic pattern. We determined through visual contact and our TCASII, that he just turned base about 2 mi out. After lining up into position, we attempted to call the tower to confirm our status. At that point we realized that we had mistakenly switched off tower frequency. We immediately called the tower, who was in the process of having the other aircraft switch to landing runway 24. They cleared us for takeoff with a request to call them on the telephone as soon as practical. Total time off the frequency was approximately 2 mins. Our mistake, but it was not intentional.

Original NASA ASRS Text

Title: C650 WAS CLRED TO BACK-TAXI INTO POS AND, WHILE DOING SO, THEY ACCIDENTALLY CHANGED FROM TWR FREQ TO DEP CTL. THEY DISCOVERED THEIR MISTAKE, BUT NOT UNTIL AFTER ONE ARR HAD TO BE CHANGED TO A DIFFERENT RWY.

Narrative: ON BDR TWR FREQ, WE WERE INSTRUCTED TO BACK-TAXI INTO POS AND HOLD RWY 29 (BACK-TAXI DISTANCE IS APPROX 1000 FT). WHILE COMPLETING THE REMAINDER OF THE 'LINE-UP' ITEMS ON THE CHKLIST, WE SET IN THE ASSIGNED DEP FREQ ON THE STANDBY SIDE. THEN WE ACCIDENTALLY SWITCHED THE BUTTON FROM STANDBY TO ACTIVE. AS WE WERE STARTING THE 180 DEG TURN INTO POS, WE WERE DISCUSSING THE OTHER ACFT IN THE TFC PATTERN. WE DETERMINED THROUGH VISUAL CONTACT AND OUR TCASII, THAT HE JUST TURNED BASE ABOUT 2 MI OUT. AFTER LINING UP INTO POS, WE ATTEMPTED TO CALL THE TWR TO CONFIRM OUR STATUS. AT THAT POINT WE REALIZED THAT WE HAD MISTAKENLY SWITCHED OFF TWR FREQ. WE IMMEDIATELY CALLED THE TWR, WHO WAS IN THE PROCESS OF HAVING THE OTHER ACFT SWITCH TO LNDG RWY 24. THEY CLRED US FOR TKOF WITH A REQUEST TO CALL THEM ON THE TELEPHONE AS SOON AS PRACTICAL. TOTAL TIME OFF THE FREQ WAS APPROX 2 MINS. OUR MISTAKE, BUT IT WAS NOT INTENTIONAL.

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.