<< >> NASA ASRS Report 298390, March 1995

A scheduled carrier experienced intermittent lost communications as a result of unscheduled VHF radio (led display) frequency changes.

Attributes
ACN	298390
Time
Date	199503
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : pbi
State Reference	FL
Altitude	msl bound lower : 10000 msl bound upper : 10000
Environment
Light	Night
Aircraft 1
Controlling Facilities	tracon : pbi
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp
Experience	flight time total : 18000
ASRS Report	298390
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Radio frequency was 124.6 on #1 VHF radio, right window. Radio changed frequency by itself 3 times to 124.4. Caused loss of communication while on approach/descent into pbi. Radio had led readout windows. Callback conversation with reporter revealed the following information: reporter stated that this has never happened, before. It was significant, in that they were approximately 40 mi west, and needed to descend. Attempted several calls before, initially, recognizing the problem. At first, they assumed that they had inadvertently selected the wrong frequency. Approach control was advised of the situation, and the flight crew used the #2 VHF, for the remainder of the flight.

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Original NASA ASRS Text

Title: A SCHEDULED CARRIER EXPERIENCED INTERMITTENT LOST COMS AS A RESULT OF UNSCHEDULED VHF RADIO (LED DISPLAY) FREQ CHANGES.

Narrative: RADIO FREQ WAS 124.6 ON #1 VHF RADIO, R WINDOW. RADIO CHANGED FREQ BY ITSELF 3 TIMES TO 124.4. CAUSED LOSS OF COM WHILE ON APCH/DSCNT INTO PBI. RADIO HAD LED READOUT WINDOWS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT THIS HAS NEVER HAPPENED, BEFORE. IT WAS SIGNIFICANT, IN THAT THEY WERE APPROX 40 MI W, AND NEEDED TO DSND. ATTEMPTED SEVERAL CALLS BEFORE, INITIALLY, RECOGNIZING THE PROB. AT FIRST, THEY ASSUMED THAT THEY HAD INADVERTENTLY SELECTED THE WRONG FREQ. APCH CTL WAS ADVISED OF THE SIT, AND THE FLC USED THE #2 VHF, FOR THE REMAINDER OF THE FLT.

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.