CORP ACFT MOVES ONTO RWY WITH ACFT ON 1 MI FINAL.

Narrative

ACFT A: BEECHCRAFT KINGAIR 300 (T/BE30/R). ACFT B: CESSNA 172/182. ACFT A TAXIED FROM RAMP TO HOLDING AREA FOR RWY 35. IFR CLRNC WAS RECEIVED PRIOR TO TAXI FROM HOUSTON CLRNC; FREQ 119.25: A HOLD FOR RELEASE WAS ISSUED WITH THE CLRNC. PNF INFORMED HOUSTON CLRNC THAT ACFT A WAS #1 FOR DEP AND A RELEASE FOR TKOF WAS GIVEN BY HOUSTON CLRNC. UNICOM 122.97 WAS MONITORED. TFC PATTERN SCENARIO WAS AS FOLLOWS: INBOUND COMMUTER ACFT ON DOWNWIND BEHIND 4 SMALL SINGLE ENG ACFT EITHER ON DOWNWIND OR LONG STRAIGHT IN TO RWY 35. THE COMMUTER ACFT (STRETCH MERLIN) BEING THE FASTER ACFT MADE A SHORT APCH (BECOMING THE #1 ACFT) AND LANDED LONG USING ALL THE RWY AND TURNED OFF AT THE END. (SGR EQUALS 8000 FT TIMES 100 FT WITH 1984 FT DISPLACED THRESHOLD: THRESHOLD IS AVAILABLE FOR TKOF) ACFT B CALLED 1 MI FINAL TO RWY 35; AT WHICH TIME ACFT A CALLED DEPARTING RWY 35; MOVED ONTO THE RWY AND COMMENCED TKOF ROLL. AT THIS TIME A XMISSION WAS MADE OVER THE UNICOM FOR ACFT A TO HOLD IN POS. ACFT A HELD ON THE THRESHOLD OF RWY 35. A 2ND XMISSION WAS MADE ON UNICOM ASKING IF WE WERE GOING TO CONTINUE HOLDING IN POS. PNF ON ACFT A RESPONDED TO THE 'AFFIRMATIVE.' APPROX 2-2.5 MINS LATER PNF ON ACFT A REQUESTED THE POS OF THE LNDG ACFT B. RESPONSE FROM ACFT B WAS 'ON TOP OF YOU' -- ACFT B LANDED NORMALLY BEYOND THE DISPLACED THRESHOLD; APPROX 1800 FT BEYOND ACFT A. THE SCENARIO; ALTHOUGH NOT A MAJOR BREACH OF SAFETY; PRESENTED THE POSSIBILITY OF A POTENTIAL PROB SIT. THE FACTORS AFFECTING THIS SIT: 1) EXTREMELY BUSY UNCTLED ENVIRONMENT. 2) BREAKDOWN OF COMS; COCKPIT DISCIPLINE AND AVIATION COURTESY WHEN MIXING HIGH AND LOW PERFORMANCE ACFT. 3) LACK OF COORDINATED EFFORTS IN SEQUENCING IFR AND VFR ACFT. A HIGHER DEGREE OF 'SITUATIONAL AWARENESS' ON BEHALF OF ALL INVOLVED CAN DECREASE THE POSSIBILITY OF A RECURRENCE OF THIS TYPE OF SCENARIO.