Part 121 aircraft landed on non approved runway.

Attributes
ACN	113821
Time
Date	198906
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : mdw
State Reference	IL
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	Light Transport, Low Wing, 2 Turboprop Eng
Flight Phase	descent : approach landing other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 250 flight time total : 8700
ASRS Report	113821
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Experience	flight time last 90 days : 250 flight time total : 4000
ASRS Report	113820
Events
Anomaly	non adherence : far
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation other

Narrative:

Landing on non approved 121 runway. In chicago midway airport. On short final ATC (tower) changed landing runway from 4R to 4L. At this point only having time to check distance required and distance available we accepted. Radio traffic was at a maximum and very hard to query or challenge any directives from tower. After further investigation found 121 operation on 4L north/a. Early notice from tower would have helped us make a more prudent decision. Last second decisions do not help safety. Controllers should not have issued this runway to this type operation.

Original NASA ASRS Text

Title: PART 121 ACFT LANDED ON NON APPROVED RWY.

Narrative: LNDG ON NON APPROVED 121 RWY. IN CHICAGO MIDWAY ARPT. ON SHORT FINAL ATC (TWR) CHANGED LNDG RWY FROM 4R TO 4L. AT THIS POINT ONLY HAVING TIME TO CHECK DISTANCE REQUIRED AND DISTANCE AVAILABLE WE ACCEPTED. RADIO TFC WAS AT A MAX AND VERY HARD TO QUERY OR CHALLENGE ANY DIRECTIVES FROM TWR. AFTER FURTHER INVESTIGATION FOUND 121 OPERATION ON 4L N/A. EARLY NOTICE FROM TWR WOULD HAVE HELPED US MAKE A MORE PRUDENT DECISION. LAST SECOND DECISIONS DO NOT HELP SAFETY. CTLRS SHOULD NOT HAVE ISSUED THIS RWY TO THIS TYPE OPERATION.

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.