Heading track deviation. Unauthorized penetration of class B airspace at ord when a temporary loss of communication frequency occurs. A B737-200 first officer accidentally loses volume on #1 radio when placing tower frequency in #2 radio northwest of mdw, il.

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Attributes
ACN	512170
Time
Date	200105
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : mdw.airport
State Reference	IL
Altitude	msl single value : 2500
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-200
Flight Phase	descent : approach
Route In Use	approach : instrument precision
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Experience	flight time total : 11000
ASRS Report	512170
Events
Anomaly	aircraft equipment problem : less severe airspace violation : entry non adherence : company policies non adherence : far non adherence : published procedure non adherence : clearance other anomaly other other spatial deviation
Resolutory Action	controller : issued new clearance flight crew : overcame equipment problem flight crew : became reoriented
Supplementary
Problem Areas	Aircraft Airspace Structure Company
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Deviation into O'hare airspace. While being radar vectored to ILS runway 13L at mdw, a 'lost communication' situation occurred. I was the PNF and we were flying a B737-200 with the radio (VHF) tuned to approach control. I then selected mdw tower frequency on the other VHF communication #2 window. While doing this, the volume was turned down completely on the #1 communication radio. We were on a vector to the ILS and about the time the localizer 'came alive' we noticed the communication radio was silent and turned the volume up. Mdw approach control was upset and gave us a turn on final and we executed the approach without further event. Possible solution: replace the radios in the -200's.

Original NASA ASRS Text

Title: HDG TRACK DEV. UNAUTH PENETRATION OF CLASS B AIRSPACE AT ORD WHEN A TEMPORARY LOSS OF COM FREQ OCCURS. A B737-200 FO ACCIDENTALLY LOSES VOLUME ON #1 RADIO WHEN PLACING TWR FREQ IN #2 RADIO NW OF MDW, IL.

Narrative: DEV INTO O'HARE AIRSPACE. WHILE BEING RADAR VECTORED TO ILS RWY 13L AT MDW, A 'LOST COM' SIT OCCURRED. I WAS THE PNF AND WE WERE FLYING A B737-200 WITH THE RADIO (VHF) TUNED TO APCH CTL. I THEN SELECTED MDW TWR FREQ ON THE OTHER VHF COM #2 WINDOW. WHILE DOING THIS, THE VOLUME WAS TURNED DOWN COMPLETELY ON THE #1 COM RADIO. WE WERE ON A VECTOR TO THE ILS AND ABOUT THE TIME THE LOC 'CAME ALIVE' WE NOTICED THE COM RADIO WAS SILENT AND TURNED THE VOLUME UP. MDW APCH CTL WAS UPSET AND GAVE US A TURN ON FINAL AND WE EXECUTED THE APCH WITHOUT FURTHER EVENT. POSSIBLE SOLUTION: REPLACE THE RADIOS IN THE -200'S.

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.