FK100 aircraft in position and hold on runway. Flight crew inadvertently bumped the frequency select knob resulting in the wrong frequency for the tower. An aircraft on approach had to go around due to lost communication with reporter aircraft.

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Attributes
ACN	365480
Time
Date	199704
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ord
State Reference	IL
Altitude	agl bound lower : 0 agl bound upper : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Fokker 100
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	ground : holding
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	365480
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
ASRS Report	365481
Events
Anomaly	aircraft equipment problem : less severe non adherence : clearance other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We taxied into position and hold on runway 22R at ord. We sat in position for about 30 seconds and I noticed an ATR going around on runway 27R. I looked down and noticed the radio frequency was 120.77 vice 120.75. We switched back to 120.75 and was told by ATC that we had caused ATR to go around because we were not on the frequency. I told ATC what had happened and was subsequently cleared for takeoff. We suspect the frequency select knob was bumped while checking the confign switch per checklist while taking the runway.

Original NASA ASRS Text

Title: FK100 ACFT IN POS AND HOLD ON RWY. FLC INADVERTENTLY BUMPED THE FREQ SELECT KNOB RESULTING IN THE WRONG FREQ FOR THE TWR. AN ACFT ON APCH HAD TO GAR DUE TO LOST COM WITH RPTR ACFT.

Narrative: WE TAXIED INTO POS AND HOLD ON RWY 22R AT ORD. WE SAT IN POS FOR ABOUT 30 SECONDS AND I NOTICED AN ATR GOING AROUND ON RWY 27R. I LOOKED DOWN AND NOTICED THE RADIO FREQ WAS 120.77 VICE 120.75. WE SWITCHED BACK TO 120.75 AND WAS TOLD BY ATC THAT WE HAD CAUSED ATR TO GAR BECAUSE WE WERE NOT ON THE FREQ. I TOLD ATC WHAT HAD HAPPENED AND WAS SUBSEQUENTLY CLRED FOR TKOF. WE SUSPECT THE FREQ SELECT KNOB WAS BUMPED WHILE CHKING THE CONFIGN SWITCH PER CHKLIST WHILE TAKING THE RWY.

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.