Very high potential for runway incursion and conflict between taxiing aircraft and other aircraft on final approach. ATC operational deviation.

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Attributes
ACN	133267
Time
Date	199001
Day	Tue
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : mdw
State Reference	IL
Altitude	agl bound lower : 0 agl bound upper : 200
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tower : mdw tower : cle
Operator	common carrier : air taxi
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	ground other : taxi
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	descent : approach landing : go around landing other
Person 1
Affiliation	company : air taxi
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 300 flight time total : 8400 flight time type : 3500
ASRS Report	133267
Person 2
Affiliation	company : air taxi
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 300 flight time total : 3700 flight time type : 1200
ASRS Report	133272
Events
Anomaly	conflict : ground less severe other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action other
Consequence	Other
Miss Distance	horizontal : 3000 vertical : 200
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Deviation

Narrative:

My copilot called for taxi on ground frequency 121.7. We were cleared to taxi from our ramp to runway 22L via west and north taxiway. Prior to exiting our ramp I requested the copilot to ask ground if we could back taxi on runway 22R to 22L. Ground cleared us to 22L via e-w and back taxi on 4L. As we approached 4L (22R) my copilot noticed that an aircraft was lined up short final for 22R. We held short of 4L (22R). Holding short I queried the controller to verify our taxi clearance. His reply was that he did not sidestep the aircraft landing to 22L. (The aircraft ended up missing the landing.) we were reclred onto 4L for back taxi to 22L. No other abnormalities occurred. We could hear the controller on ground giving instructions to landing and taking off aircraft. He was obviously working two frequencys at the same time. The vigilance of my copilot probably saved us from a serious mishap. Maybe if we all were on the same frequency this might not have happened. If one controller is going to work both positions have everyone on tower frequency.

Original NASA ASRS Text

Title: VERY HIGH POTENTIAL FOR RWY INCURSION AND CONFLICT BETWEEN TAXIING ACFT AND OTHER ACFT ON FINAL APCH. ATC OPERATIONAL DEVIATION.

Narrative: MY COPLT CALLED FOR TAXI ON GND FREQ 121.7. WE WERE CLRED TO TAXI FROM OUR RAMP TO RWY 22L VIA W AND N TXWY. PRIOR TO EXITING OUR RAMP I REQUESTED THE COPLT TO ASK GND IF WE COULD BACK TAXI ON RWY 22R TO 22L. GND CLRED US TO 22L VIA E-W AND BACK TAXI ON 4L. AS WE APCHED 4L (22R) MY COPLT NOTICED THAT AN ACFT WAS LINED UP SHORT FINAL FOR 22R. WE HELD SHORT OF 4L (22R). HOLDING SHORT I QUERIED THE CTLR TO VERIFY OUR TAXI CLRNC. HIS REPLY WAS THAT HE DID NOT SIDESTEP THE ACFT LNDG TO 22L. (THE ACFT ENDED UP MISSING THE LNDG.) WE WERE RECLRED ONTO 4L FOR BACK TAXI TO 22L. NO OTHER ABNORMALITIES OCCURRED. WE COULD HEAR THE CTLR ON GND GIVING INSTRUCTIONS TO LNDG AND TAKING OFF ACFT. HE WAS OBVIOUSLY WORKING TWO FREQS AT THE SAME TIME. THE VIGILANCE OF MY COPLT PROBABLY SAVED US FROM A SERIOUS MISHAP. MAYBE IF WE ALL WERE ON THE SAME FREQ THIS MIGHT NOT HAVE HAPPENED. IF ONE CTLR IS GOING TO WORK BOTH POSITIONS HAVE EVERYONE ON TWR FREQ.

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.