DHC2 pilot has elevator trim problem and flight following confusion for a controller near lhd, ak.

Attributes
ACN	469190
Time
Date	200004
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : lhd.airport
State Reference	AK
Altitude	msl single value : 3000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	other
Make Model Name	Turbo Beaver DHC-2
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	cruise : level
Route In Use	enroute : direct
Flight Plan	VFR
Aircraft 2
Controlling Facilities	tracon : a11.tracon
Operator	common carrier : air carrier
Make Model Name	B747 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Plan	IFR
Person 1
Affiliation	government : military
Function	flight crew : single pilot
Qualification	pilot : multi engine pilot : instrument pilot : commercial pilot : cfi pilot : atp
Experience	flight time last 90 days : 10 flight time total : 6000 flight time type : 13
ASRS Report	469190
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	other controllerb other flight crewa
Resolutory Action	flight crew : overcame equipment problem other
Supplementary
Problem Areas	Weather Flight Crew Human Performance Aircraft ATC Human Performance
Primary Problem	Aircraft

Narrative:

On departure wbound from lake hood strip, anchorage, ak, approximately 15 mi away, the elevator trim became stuck due to something in the system most likely freezing. I was under radar advisory control and asked for a return to lake hood strip. I started a descent and headed eastbound after advising the controller. On descent, the trim started to work and I decided to reverse course again and proceed towards my original destination wbound. At that point the controller advised me of a B747, I acknowledged the B747 and stated I was planning to reverse course again wbound. The frequency was very congested and the controller, as I remember, talked to another aircraft immediately. A few mins later the controller asked if I was wbound and sounded surprised. I advised him I asked for permission and he stated I must have been stepped on. There was no conflict with any other aircraft as far as I know. In hindsight, it would have been better to wait for the controller clearly acknowledging prior to making the last turn.

Original NASA ASRS Text

Title: DHC2 PLT HAS ELEVATOR TRIM PROB AND FLT FOLLOWING CONFUSION FOR A CTLR NEAR LHD, AK.

Narrative: ON DEP WBOUND FROM LAKE HOOD STRIP, ANCHORAGE, AK, APPROX 15 MI AWAY, THE ELEVATOR TRIM BECAME STUCK DUE TO SOMETHING IN THE SYS MOST LIKELY FREEZING. I WAS UNDER RADAR ADVISORY CTL AND ASKED FOR A RETURN TO LAKE HOOD STRIP. I STARTED A DSCNT AND HEADED EBOUND AFTER ADVISING THE CTLR. ON DSCNT, THE TRIM STARTED TO WORK AND I DECIDED TO REVERSE COURSE AGAIN AND PROCEED TOWARDS MY ORIGINAL DEST WBOUND. AT THAT POINT THE CTLR ADVISED ME OF A B747, I ACKNOWLEDGED THE B747 AND STATED I WAS PLANNING TO REVERSE COURSE AGAIN WBOUND. THE FREQ WAS VERY CONGESTED AND THE CTLR, AS I REMEMBER, TALKED TO ANOTHER ACFT IMMEDIATELY. A FEW MINS LATER THE CTLR ASKED IF I WAS WBOUND AND SOUNDED SURPRISED. I ADVISED HIM I ASKED FOR PERMISSION AND HE STATED I MUST HAVE BEEN STEPPED ON. THERE WAS NO CONFLICT WITH ANY OTHER ACFT AS FAR AS I KNOW. IN HINDSIGHT, IT WOULD HAVE BEEN BETTER TO WAIT FOR THE CTLR CLRLY ACKNOWLEDGING PRIOR TO MAKING THE LAST TURN.

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.