Narrative:

I was flying a cma X from sgf to jln. I reported 3 mi out and was instructed to report 1 mi final approach. I reported a 1 mi final. At this pint radio communications deteriorated becoming weak and garbled. I heard 'cleared to land' (very weakly) on the radio. At that time my aircraft encountered what I felt to be a wind shear or microburst that caused me to be thrown violently against the seat belts (I also struck my head on the roof of the aircraft). The aircraft began an uncommanded climb, so I immediately reduced power and lowered the nose. As the nose lowered, I noticed that another plane (maybe an small transport Y) had begun to move out onto runway 22. I called tower with no response. Before I could response the aircraft began a severe uncontrolled descent with loss of airspeed and continual sounding of the stall warning horn. As this was happening I was in the middle of recycling the master switch and radio master to ascertain the communications problem. The uncontrolled descent was so violent I again struck my head. At this point I was 100 or 50', or less, above the runway and feared a crash due to loss of lift and airspeed. At this point, being close to the ground, my decision was to elect to attempt a landing, due to what I perceived to be a loss of relative wind, loss of lift, and loss of airspeed. I felt I was experiencing a wind shear encounter with insufficient power to climb out of it. I landed very long down the runway, far ahead of my usual T/D spot. I taxied off the runway to a taxiway and tried to reach the tower west/O success. I went immediately to the tower to talk to tower/FAA personnel by phone. I was informed by tower personnel that field maintenance/construction personnel had disrupted the radio communication lines, and that the back-up system wasn't working correctly. I feel I did the best I could, given the conditions, in avoiding an accident. I regret the loss of communications, and landing over another aircraft, but I feel that some credit is due for controling my aircraft and avoiding an accident.

Related reports:

Google
 

Original NASA ASRS Text

Title: INEXPERIENCED PLT OF LIGHT SINGLE ENGINE ACFT EXPERIENCES WIND SHEAR AND COMS FAILURE ON SHORT FINAL.

Narrative: I WAS FLYING A CMA X FROM SGF TO JLN. I RPTED 3 MI OUT AND WAS INSTRUCTED TO RPT 1 MI FINAL APCH. I RPTED A 1 MI FINAL. AT THIS PINT RADIO COMS DETERIORATED BECOMING WEAK AND GARBLED. I HEARD 'CLRED TO LAND' (VERY WEAKLY) ON THE RADIO. AT THAT TIME MY ACFT ENCOUNTERED WHAT I FELT TO BE A WIND SHEAR OR MICROBURST THAT CAUSED ME TO BE THROWN VIOLENTLY AGAINST THE SEAT BELTS (I ALSO STRUCK MY HEAD ON THE ROOF OF THE ACFT). THE ACFT BEGAN AN UNCOMMANDED CLB, SO I IMMEDIATELY REDUCED PWR AND LOWERED THE NOSE. AS THE NOSE LOWERED, I NOTICED THAT ANOTHER PLANE (MAYBE AN SMT Y) HAD BEGUN TO MOVE OUT ONTO RWY 22. I CALLED TWR WITH NO RESPONSE. BEFORE I COULD RESPONSE THE ACFT BEGAN A SEVERE UNCONTROLLED DSCNT WITH LOSS OF AIRSPD AND CONTINUAL SOUNDING OF THE STALL WARNING HORN. AS THIS WAS HAPPENING I WAS IN THE MIDDLE OF RECYCLING THE MASTER SWITCH AND RADIO MASTER TO ASCERTAIN THE COMS PROB. THE UNCONTROLLED DSCNT WAS SO VIOLENT I AGAIN STRUCK MY HEAD. AT THIS POINT I WAS 100 OR 50', OR LESS, ABOVE THE RWY AND FEARED A CRASH DUE TO LOSS OF LIFT AND AIRSPD. AT THIS POINT, BEING CLOSE TO THE GND, MY DECISION WAS TO ELECT TO ATTEMPT A LNDG, DUE TO WHAT I PERCEIVED TO BE A LOSS OF RELATIVE WIND, LOSS OF LIFT, AND LOSS OF AIRSPD. I FELT I WAS EXPERIENCING A WIND SHEAR ENCOUNTER WITH INSUFFICIENT PWR TO CLB OUT OF IT. I LANDED VERY LONG DOWN THE RWY, FAR AHEAD OF MY USUAL T/D SPOT. I TAXIED OFF THE RWY TO A TXWY AND TRIED TO REACH THE TWR W/O SUCCESS. I WENT IMMEDIATELY TO THE TWR TO TALK TO TWR/FAA PERSONNEL BY PHONE. I WAS INFORMED BY TWR PERSONNEL THAT FIELD MAINT/CONSTRUCTION PERSONNEL HAD DISRUPTED THE RADIO COM LINES, AND THAT THE BACK-UP SYS WASN'T WORKING CORRECTLY. I FEEL I DID THE BEST I COULD, GIVEN THE CONDITIONS, IN AVOIDING AN ACCIDENT. I REGRET THE LOSS OF COMS, AND LNDG OVER ANOTHER ACFT, BUT I FEEL THAT SOME CREDIT IS DUE FOR CTLING MY ACFT AND AVOIDING AN ACCIDENT.

Data retrieved from NASA's ASRS site as of August 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.