Stuck boom microphone creates lost communication for air carrier medium large transport.

Attributes
ACN	136316
Time
Date	199002
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : atl
State Reference	GA
Altitude	msl bound lower : 14000 msl bound upper : 14000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : atl tower : sat
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : flight engineer pilot : instrument pilot : private
Experience	flight time last 90 days : 120 flight time total : 15000 flight time type : 350
ASRS Report	136316
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

We discovered after landing that the copilot's boom microphone was hot. The switch was found to be defective. We could not transmit or receive on either VHF radio for a # of mins. We therefore squawked 7600 and maintained VFR conditions and returned to the airport and landed. We were able to restore some communication with ATC prior to landing.

Original NASA ASRS Text

Title: STUCK BOOM MIC CREATES LOST COM FOR ACR MLG.

Narrative: WE DISCOVERED AFTER LNDG THAT THE COPLT'S BOOM MIC WAS HOT. THE SWITCH WAS FOUND TO BE DEFECTIVE. WE COULD NOT XMIT OR RECEIVE ON EITHER VHF RADIO FOR A # OF MINS. WE THEREFORE SQUAWKED 7600 AND MAINTAINED VFR CONDITIONS AND RETURNED TO THE ARPT AND LANDED. WE WERE ABLE TO RESTORE SOME COM WITH ATC PRIOR TO LNDG.

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.