A cpr pilot in a BE9L encountered LLWS with airspeed fluctuations during his final approach and he forgot to switch to the tower frequency for landing.

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Attributes
ACN	428122
Time
Date	199902
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : den.airport
State Reference	CO
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Weather Elements	Turbulence Windshear
Light	Daylight
Aircraft 1
Controlling Facilities	tower : den.tower
Operator	general aviation : corporate
Make Model Name	King Air C90 E90
Operating Under FAR Part	Part 91
Navigation In Use	other
Flight Phase	landing : roll
Route In Use	approach : visual
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : single pilot
Qualification	pilot : multi engine pilot : instrument pilot : commercial pilot : atp
Experience	flight time last 90 days : 115 flight time total : 8500 flight time type : 3000
ASRS Report	428122
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : radar
Events
Anomaly	incursion : landing without clearance non adherence : published procedure non adherence : clearance
Independent Detector	other controllera other flight crewa
Resolutory Action	none taken : detected after the fact
Consequence	Other
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

I was on a visual approach, IFR flight plan, for runway 17R at den, on approach frequency 120.8. There were reports of 2 microbursts and windshear for the airport with reports of 30+ gains and losses in airspeed from previous aircraft ahead of me. About 3 mi final, I started getting +/-35 KT airspeed variations and was very busy trying to stabilize the approach when I did not get a handoff to tower frequency. I landed without a clearance from tower since I had not gotten a handoff. I got on the ground and called the den tower supervisor, but got an answering machine, and left a message of what had happened. I never received a call back from them.

Original NASA ASRS Text

Title: A CPR PLT IN A BE9L ENCOUNTERED LLWS WITH AIRSPD FLUCTUATIONS DURING HIS FINAL APCH AND HE FORGOT TO SWITCH TO THE TWR FREQ FOR LNDG.

Narrative: I WAS ON A VISUAL APCH, IFR FLT PLAN, FOR RWY 17R AT DEN, ON APCH FREQ 120.8. THERE WERE RPTS OF 2 MICROBURSTS AND WINDSHEAR FOR THE ARPT WITH RPTS OF 30+ GAINS AND LOSSES IN AIRSPD FROM PREVIOUS ACFT AHEAD OF ME. ABOUT 3 MI FINAL, I STARTED GETTING +/-35 KT AIRSPD VARIATIONS AND WAS VERY BUSY TRYING TO STABILIZE THE APCH WHEN I DID NOT GET A HDOF TO TWR FREQ. I LANDED WITHOUT A CLRNC FROM TWR SINCE I HAD NOT GOTTEN A HDOF. I GOT ON THE GND AND CALLED THE DEN TWR SUPVR, BUT GOT AN ANSWERING MACHINE, AND LEFT A MESSAGE OF WHAT HAD HAPPENED. I NEVER RECEIVED A CALL BACK FROM THEM.

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.