BE35 IFR at 13000 ft lost communication with ATC in ZLA airspace.

Attributes
ACN	588629
Time
Date	200307
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : zla.artcc
State Reference	CA
Altitude	msl single value : 13000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zla.artcc tower : dfw.tower
Operator	general aviation : personal
Make Model Name	Bonanza 36
Operating Under FAR Part	Part 91
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	other
Function	flight crew : single pilot
Qualification	pilot : atp pilot : multi engine pilot : instrument pilot : cfi
Experience	flight time last 90 days : 40 flight time total : 5400 flight time type : 450
ASRS Report	588629
Person 2
Affiliation	government : faa
Function	controller : radar
Events
Anomaly	other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	ATC Human Performance Aircraft Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

While in cruise on an IFR flight (in VFR conditions) I lost contact with center for about 30 mins. I just had a new radio stack put in my airplane and must have switched frequencys by mistake. I did not recognize the change for about 30 mins when I went back to the right frequency. I was still with the same controller. Almost no traffic. No conflicts. I will take care to double-check frequencys in the future. And although I was upset at this mistake, the controller seemed unconcerned because I was unconflicted and on airway.

Original NASA ASRS Text

Title: BE35 IFR AT 13000 FT LOST COM WITH ATC IN ZLA AIRSPACE.

Narrative: WHILE IN CRUISE ON AN IFR FLT (IN VFR CONDITIONS) I LOST CONTACT WITH CTR FOR ABOUT 30 MINS. I JUST HAD A NEW RADIO STACK PUT IN MY AIRPLANE AND MUST HAVE SWITCHED FREQS BY MISTAKE. I DID NOT RECOGNIZE THE CHANGE FOR ABOUT 30 MINS WHEN I WENT BACK TO THE RIGHT FREQ. I WAS STILL WITH THE SAME CTLR. ALMOST NO TFC. NO CONFLICTS. I WILL TAKE CARE TO DOUBLE-CHK FREQS IN THE FUTURE. AND ALTHOUGH I WAS UPSET AT THIS MISTAKE, THE CTLR SEEMED UNCONCERNED BECAUSE I WAS UNCONFLICTED AND ON AIRWAY.

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.