A B737 first officer report on a tendency of VHF radios to change numerals when switching from one frequency window to the other. A temporary loss of communication frequency on frequency with ZDC.

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Attributes
ACN	482130
Time
Date	200008
Day	Tue
Local Time Of Day	1201 To 1800
Place
State Reference	WV
Altitude	msl single value : 29000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc.artcc
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other vortac
Flight Phase	cruise : enroute altitude change
Route In Use	arrival star : bucko
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : multi engine pilot : commercial
ASRS Report	482130
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft
Primary Problem	Aircraft

Narrative:

Location: esl, bucko arrival. Switched to 133.65 and attempted radio check-in. Returned to previous frequency. ZDC gave us vector left 360 degrees for descent to 15000 ft. No negative comments made by ATC. I've noticed that occasionally when switching frequencys on the B737 the numerals change when flopping frequency windows. I missed the frequency error, but caught it when I couldn't get the controller on the 134.65 to answer and returned to previous frequency.

Original NASA ASRS Text

Title: A B737 FO RPT ON A TENDENCY OF VHF RADIOS TO CHANGE NUMERALS WHEN SWITCHING FROM ONE FREQ WINDOW TO THE OTHER. A TEMPORARY LOSS OF COM FREQ ON FREQ WITH ZDC.

Narrative: LOCATION: ESL, BUCKO ARR. SWITCHED TO 133.65 AND ATTEMPTED RADIO CHK-IN. RETURNED TO PREVIOUS FREQ. ZDC GAVE US VECTOR L 360 DEGS FOR DSCNT TO 15000 FT. NO NEGATIVE COMMENTS MADE BY ATC. I'VE NOTICED THAT OCCASIONALLY WHEN SWITCHING FREQS ON THE B737 THE NUMERALS CHANGE WHEN FLOPPING FREQ WINDOWS. I MISSED THE FREQ ERROR, BUT CAUGHT IT WHEN I COULDN'T GET THE CTLR ON THE 134.65 TO ANSWER AND RETURNED TO PREVIOUS FREQ.

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.