An large transport commercial fixed wing aircraft in cruise at FL230 had #1 communication radio skip frequency incurring missed calls from ATC caused by a failed frequency control panel.

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Attributes
ACN	435245
Time
Date	199904
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : lax.vortac
State Reference	CA
Altitude	msl single value : 23000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zla.artcc
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : level
Route In Use	enroute airway : j9.airway
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : atp pilot : commercial pilot : instrument
Experience	flight time last 90 days : 180 flight time total : 11400 flight time type : 4000
ASRS Report	435245
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : multi engine
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : detected after the fact
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

At FL230 from sna to las we had radio trouble with our #1 communication. We have liquid crystal readouts on our radios. It appears that we were on frequency 125.72 and the frequency jumped to 125.70 by itself. We missed several radio calls from ZLA. When we realized the problem after a few mins we contacted ZLA on 125.72 and proceeded to las without any further radio problems.

Original NASA ASRS Text

Title: AN LGT COMMERCIAL FIXED WING ACFT IN CRUISE AT FL230 HAD #1 COM RADIO SKIP FREQ INCURRING MISSED CALLS FROM ATC CAUSED BY A FAILED FREQ CTL PANEL.

Narrative: AT FL230 FROM SNA TO LAS WE HAD RADIO TROUBLE WITH OUR #1 COM. WE HAVE LIQUID CRYSTAL READOUTS ON OUR RADIOS. IT APPEARS THAT WE WERE ON FREQ 125.72 AND THE FREQ JUMPED TO 125.70 BY ITSELF. WE MISSED SEVERAL RADIO CALLS FROM ZLA. WHEN WE REALIZED THE PROB AFTER A FEW MINS WE CONTACTED ZLA ON 125.72 AND PROCEEDED TO LAS WITHOUT ANY FURTHER RADIO PROBS.

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.