Flight crew of B752 experience stuck microphone on departure from ord.

Attributes
ACN	616751
Time
Date	200405
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : ord.airport
State Reference	IL
Altitude	msl single value : 5000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : c90.tracon tower : ord.tower tower : lfpg.tower
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : initial climbout : takeoff climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Experience	flight time last 90 days : 170 flight time total : 7000 flight time type : 4034
ASRS Report	616751
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 190 flight time total : 15000 flight time type : 4800
ASRS Report	616752
Events
Anomaly	aircraft equipment problem : critical altitude deviation : overshoot other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : overcame equipment problem
Consequence	other other
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

Stuck microphone on departure. On liftoff on runway 22L ord, we noticed a side tone on our radios. I did not hear anyone talking on the radios, so I called ord tower. No response. I tried several more times and then switched to guard. On the first few tries on guard, I received no response, so we squawked 7600. We were level at 5000 ft by this time and flying runway heading (last assigned). We suspected we had a hot microphone because of the side tone. We began a left turn towards gij. During the turn, I finally could hear ord on guard (over a loud side tone) giving us instructions. We executed the heading and altitude clearance. We were in and out of communications with ord for about another min or so until we finally isolated the problem to the captain's microphone. After problem solved, dispatch sent a message indicating we were the hot microphone. Once communications were established, we continued to iad uneventfully. During the problem, the captain and I verbally divided our duties -- PNF, PF. Supplemental information from acn 616752: intermittent radio contact on 121.5. Reached 5300 ft but returned to 5000 ft when got temporary radio contact to maintain 5000 ft. Finally isolated problem to the captain's radio. Used first officer radio. Made ACARS contact with dispatch to confirm operations normal but 7600 squawk coordination with dispatch to fly cleared route if anymore radio problems per far. Coordination with lead federal air marshal on board since going to iad.

Original NASA ASRS Text

Title: FLT CREW OF B752 EXPERIENCE STUCK MIKE ON DEP FROM ORD.

Narrative: STUCK MIKE ON DEP. ON LIFTOFF ON RWY 22L ORD, WE NOTICED A SIDE TONE ON OUR RADIOS. I DID NOT HEAR ANYONE TALKING ON THE RADIOS, SO I CALLED ORD TWR. NO RESPONSE. I TRIED SEVERAL MORE TIMES AND THEN SWITCHED TO GUARD. ON THE FIRST FEW TRIES ON GUARD, I RECEIVED NO RESPONSE, SO WE SQUAWKED 7600. WE WERE LEVEL AT 5000 FT BY THIS TIME AND FLYING RWY HDG (LAST ASSIGNED). WE SUSPECTED WE HAD A HOT MIKE BECAUSE OF THE SIDE TONE. WE BEGAN A L TURN TOWARDS GIJ. DURING THE TURN, I FINALLY COULD HEAR ORD ON GUARD (OVER A LOUD SIDE TONE) GIVING US INSTRUCTIONS. WE EXECUTED THE HDG AND ALT CLRNC. WE WERE IN AND OUT OF COMS WITH ORD FOR ABOUT ANOTHER MIN OR SO UNTIL WE FINALLY ISOLATED THE PROB TO THE CAPT'S MIKE. AFTER PROB SOLVED, DISPATCH SENT A MESSAGE INDICATING WE WERE THE HOT MIKE. ONCE COMS WERE ESTABLISHED, WE CONTINUED TO IAD UNEVENTFULLY. DURING THE PROB, THE CAPT AND I VERBALLY DIVIDED OUR DUTIES -- PNF, PF. SUPPLEMENTAL INFO FROM ACN 616752: INTERMITTENT RADIO CONTACT ON 121.5. REACHED 5300 FT BUT RETURNED TO 5000 FT WHEN GOT TEMPORARY RADIO CONTACT TO MAINTAIN 5000 FT. FINALLY ISOLATED PROB TO THE CAPT'S RADIO. USED FO RADIO. MADE ACARS CONTACT WITH DISPATCH TO CONFIRM OPS NORMAL BUT 7600 SQUAWK COORD WITH DISPATCH TO FLY CLRED RTE IF ANYMORE RADIO PROBS PER FAR. COORD WITH LEAD FEDERAL AIR MARSHAL ON BOARD SINCE GOING TO IAD.

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.