Loss of radio communication with blocked frequency and erratic reception caused flight to return and...

Attributes
ACN	182496
Time
Date	199106
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : bwi
State Reference	MD
Altitude	msl bound lower : 4000 msl bound upper : 4000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : bwi
Operator	common carrier : air carrier
Make Model Name	Medium Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : takeoff landing other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : atp
Experience	flight time last 90 days : 150 flight time total : 5450
ASRS Report	182496
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : instrument pilot : atp
Experience	flight time last 90 days : 157 flight time total : 11000
ASRS Report	182646
Events
Anomaly	aircraft equipment problem : critical aircraft equipment problem : less severe
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Departed bwi on runway 28 with instructions to climb to 400' and turn right to 150 degrees. During the climb I could not contact tower or departure. No communication on either frequency. We tried both communications and several frequencys with no luck. We then received an ACARS message from company to try another frequency. We contacted the company on 130.57 with some interference on communication 2 (when communication #1 matched communication #2). We could not use the radio, only could eventually communicate when communication #2 differed from communication #1. At this point we were able to contact ground control, who informed us of a stuck microphone. After unplugging mics, we determined it was the #1 microphone an left it unplugged, although communication #1 was still unusable. Then contacted tower, who sent us to approach control 119.7. Vectored for ILS 33L and landed. Maintenance replaced #1 microphone and #1 communication box and #1 and 2 communication control.

Original NASA ASRS Text

Title: LOSS OF RADIO COM WITH BLOCKED FREQ AND ERRATIC RECEPTION CAUSED FLT TO RETURN AND LAND.

Narrative: DEPARTED BWI ON RWY 28 WITH INSTRUCTIONS TO CLB TO 400' AND TURN RIGHT TO 150 DEGS. DURING THE CLB I COULD NOT CONTACT TWR OR DEP. NO COM ON EITHER FREQ. WE TRIED BOTH COMS AND SEVERAL FREQS WITH NO LUCK. WE THEN RECEIVED AN ACARS MESSAGE FROM COMPANY TO TRY ANOTHER FREQ. WE CONTACTED THE COMPANY ON 130.57 WITH SOME INTERFERENCE ON COM 2 (WHEN COM #1 MATCHED COM #2). WE COULD NOT USE THE RADIO, ONLY COULD EVENTUALLY COMMUNICATE WHEN COM #2 DIFFERED FROM COM #1. AT THIS POINT WE WERE ABLE TO CONTACT GND CTL, WHO INFORMED US OF A STUCK MIC. AFTER UNPLUGGING MICS, WE DETERMINED IT WAS THE #1 MIC AN LEFT IT UNPLUGGED, ALTHOUGH COM #1 WAS STILL UNUSABLE. THEN CONTACTED TWR, WHO SENT US TO APCH CTL 119.7. VECTORED FOR ILS 33L AND LANDED. MAINT REPLACED #1 MIC AND #1 COM BOX AND #1 AND 2 COM CTL.

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.

Loss of radio communication with blocked frequency and erratic reception caused flight to return and land.