Air carrier medium large transport frequency change premature. Tower unable to delay takeoff due los...

Attributes
ACN	108410
Time
Date	198904
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dfw
State Reference	TX
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 Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	climbout : takeoff
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : atp
Experience	flight time last 90 days : 180 flight time total : 12000 flight time type : 2500
ASRS Report	108410
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	non adherence : far other anomaly other
Independent Detector	other controllera
Resolutory Action	none taken : unable
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Approaching the takeoff end of runway 36R dfw tower was called. They cleared us for takeoff. At this time I believe the transfer switch on #2 VHF was inadvertently positioned to the opposite position putting aircraft communication on departure rather than tower. Tower attempted to delay takeoff but was unable to reach aircraft. The majority of the time when a frequency change is made the toggle switch is moved to the other frequency. Suggest an effort be made to switch frequency early and signs posted at airports telling when to switch to tower and giving frequency.

Original NASA ASRS Text

Title: ACR MLG FREQ CHANGE PREMATURE. TWR UNABLE TO DELAY TKOF DUE LOSS OF RADIO CONTACT.

Narrative: APCHING THE TKOF END OF RWY 36R DFW TWR WAS CALLED. THEY CLRED US FOR TKOF. AT THIS TIME I BELIEVE THE TRANSFER SWITCH ON #2 VHF WAS INADVERTENTLY POSITIONED TO THE OPPOSITE POSITION PUTTING ACFT COMMUNICATION ON DEP RATHER THAN TWR. TWR ATTEMPTED TO DELAY TKOF BUT WAS UNABLE TO REACH ACFT. THE MAJORITY OF THE TIME WHEN A FREQ CHANGE IS MADE THE TOGGLE SWITCH IS MOVED TO THE OTHER FREQ. SUGGEST AN EFFORT BE MADE TO SWITCH FREQ EARLY AND SIGNS POSTED AT ARPTS TELLING WHEN TO SWITCH TO TWR AND GIVING FREQ.

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.

Air carrier medium large transport frequency change premature. Tower unable to delay takeoff due loss of radio contact.