A PLT EXAMINER WHO WAS GIVING AN INST FLT TEST HAS TO TAKE OVER THE ACFT TO AVOID A DEPARTING JETSTREAM.

Narrative

I WAS ACTING AS A DESIGNATED PLT EXAMINER ADMINISTERING AN INST AIRPLANE PRACTICAL TEST. THE APPLICANT; A PVT PLT; FURNISHED A PIPER PA-28-181 ACFT FOR THE TEST. WX WAS GOOD VFR. BRL ASOS WAS RPTING WINDS 020 DEGS VARIABLE TO 060 DEGS AT 4-10 KTS. LOCAL TFC HAD BEEN USING RWY 36. I HAD GIVEN THE APPLICANT VECTORS FOR A SIMULATED ILS APCH TO RWY 36 AT BRL. HE HAD INTERCEPTED THE LOC APPROX 4 1/2 MI OUTSIDE THE BURNS OM. WE WERE XMITTING AND RECEIVING ON 123.0; THE LOCAL ADVISORY FREQ. AT THIS TIME ANOTHER ACFT TRIED TO XMIT; BUT WAS COMPLETELY UNREADABLE. I REMARKED TO THE APPLICANT 'SOMEONE REALLY HAS A LOUSY XMITTER;' AND HE AGREED. WE HEARD NO FURTHER XMISSIONS FROM ANYONE FOR SEVERAL MINS; BUT WERE HEARING A CONSIDERABLE AMOUNT OF BACKGND NOISE OR INTERFERENCE; FROM AN UNKNOWN SOURCE. IT SOUNDED A LITTLE LIKE A STUCK MIKE BUTTON; SO WE CHKED OURS; THEY WERE OK. UPON REACHING THE OM WE CALLED THE 'BURNS OM INBOUND DOING A SIMULATED ILS APCH FOR RWY 36 AT BRL; LOW APCH ONLY AND WOULD BE DOING A MISSED APCH.' WE HEARD NO FURTHER XMISSIONS AS WE WERE TRACKING THE GS AND LOC TOWARD THE ARPT. AT THIS TIME I ADVISED THE APPLICANT THAT FOR THIS SIMULATED APCH; HE SHOULD CONSIDER THE 'DECISION HT' TO BE 1000 FT MSL. AT ABOUT 1/2 MI FROM THE END OF RWY 36; AND APCHING 1000 FT MSL; I SAW 3 LNDG LIGHTS OF AN ACFT THAT HAD JUST LIFTED OFF RWY 18. I ADVISED THE APPLICANT THAT I HAD THE AIRPLANE AND MADE AN IMMEDIATE DIVING TURN TO THE L. I TURNED L BECAUSE THE APPLICANT'S APCH WAS SLIGHTLY TO THE L OF THE RWY. THEN I NOTED THE JETSTREAM 32 ACFT WAS STARTING A CLBING R TURN. AT THAT POINT IT WAS TOO LATE TO REVERSE COURSE SO I CONTINUED TO THE L AND TO AN ALT OF APPROX 900 FT MSL. THE JETSTREAM 32 PASSED BEHIND AND ABOVE US. WE CONTINUED THE PRACTICAL TEST FOR NEARLY AN HR; DOING AN ADF APCH AND A VOR APCH WITH HOLDING AT THE BRL VOR. WE ANNOUNCED OUR POS AND PROCS AT THE APPROPRIATE TIMES BUT HEARD VERY LITTLE OTHER TFC DURING THIS TIME; WHICH IS NOT UNCOMMON FOR THIS TIME AND LOCATION. LATER WE CONDUCTED A RADIO CHK WITH THE LOCAL UNICOM AND BOTH WERE LOUD AND CLR. IT WOULD SEEM THE 'SIT' WAS A RESULT OF NEITHER ACFT HEARING THE OTHER; CONSEQUENTLY NOT KNOWING THE OTHER'S POS OR INTENTIONS.