BE99 CREW; ROLLING OUT AFTER LNDG AT RDM; ENCOUNTERED A DASH 8 ACFT DEPARTING A XING RWY.

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DURING A TRAINING FLT IN THE VICINITY OF THE REDMOND ROBERTS FIELD; THE FOLLOWING COM EVENTS OCCURRED: INITIAL CONDITIONS: OUR POS WAS 10 NM S OF THE AIRFIELD DSNDING OUT OF 6000 FT; PROCEEDING N WITH THE INTENTION TO LAND AT RDM. THE INITIAL CALL-UP WITH OUR POS AND INTENTIONS WAS MADE TO ATC; WHICH ACKNOWLEDGED THE CALL AND INSTRUCTED US TO RPT ON A R DOWNWIND FOR RWY 10. TFC AT THE ARPT DURING THE ARR: 1 CESSNA ACFT INITIALLY RPTED TO BE 7 NM N; AND THEN (IMMEDIATELY LATER) 2 NM N AT 4500 FT TRANSITIONING N TO S OVER THE FIELD. ANOTHER CESSNA ACFT ON L DOWNWIND FOR RWY 10 APCHING THE BASE TURN. ACFT Z WAS ATTEMPTING TO GET A CLRNC TO DEPART FROM THE RAMP; AND AN UNKNOWN GND TFC. UPON ENTERING THE R TFC PATTERN FOR RWY 10; WE MADE THE PATTERN ENTRY RPT AS INSTRUCTED WITH THE COMMENT THAT WE WERE 'STAYING AT 5000 FT TO AVOID THE TRANSITIONING TFC.' WE ALSO RPTED THAT TFC WAS NOT IN SIGHT. THE TRANSITIONING ACFT RPTED TO ATC 'R DOWNWIND TFC IN SIGHT.' ATC CLRED US '#2 BEHIND THE CESSNA ON L DOWNWIND.' NOTE: ATC NEVER INSTRUCTED US TO RPT THE L DOWNWIND TFC IN SIGHT. WE HAD THE DOWNWIND TFC IN SIGHT AT ALL TIMES WHILE IN THE PATTERN. WE RPTED TO THE TWR '#2 FOR THE FIELD.' NO COMMENT FROM ATC WAS MADE AT THAT TIME. WHILE ON FINAL; ATC WAS HEARD GIVING ACFT Z HIS DEP CLRNC. WE LANDED ON RWY 10 AFTER THE CESSNA AHEAD HAD PERFORMED A TOUCH-AND-GO. THE CESSNA WAS 200-400 FT AGL AS WE TOUCHED DOWN ONTO THE RWY. AS OUR ACFT SLOWED BELOW 40 KTS (NEAR TXWY INTXN D); ACFT Z (AIRBORNE) PASSED AHEAD DEPARTING FROM RWY 4. NOTE: ACFT ON RWY 4 ARE HIDDEN FROM VIEW BY THE TERMINAL BUILDINGS AS VIEWED FROM THE APCH END OF RWY 10. SUMMARY: THE ATC CTLR WAS IN THE TWR AND ACTING AS BOTH TWR CTLR AND GND CTLR. HIS RADIO XMISSIONS WERE ON BOTH TWR AND GND CTL FREQS. SPECIFICALLY; WE WERE CONCERNED ABOUT THE TRANSITIONING ACFT AT OUR PATTERN ALT AND SPACING BTWN US AND THE ACFT ON THE L DOWNWIND TO FINAL. SINCE THE ATC CTLR WAS ISSUING A DEP CLRNC TO ACFT Z (AND INSTRUCTIONS TO OTHERS); WE DIDN'T HEAR THE ATC INSTRUCTION TO THE ACFT Z 'CLRED FOR TKOF.' EVEN THOUGH WE HAD RPTED ON DOWNWIND AS INSTRUCTED; AND I HAD ACCIDENTALLY KEYED THE MIKE WHILE GIVING INSTRUCTIONS TO MY FO CONCERNING SPACING BTWN US AND THE CESSNA AHEAD; THE ATC CTLR NEVER COMMUNICATED TO US ANY INTENTION TO TERMINATE A LNDG CLRNC. HE APPARENTLY FORGOT THAT WE WERE ON FINAL BEHIND THE CESSNA. THERE WAS A COM BREAKDOWN BTWN US AND THE ATC CTLR BECAUSE ALL GND AND AIR COMS WERE BEING HEARD OVER THE TWR FREQ. THERE MAY HAVE BEEN SOME CONFUSION CONCERNING TFC RPTS AS WELL. THE TFC WE WERE RPTING (IN SIGHT OR NOT IN SIGHT) WAS THE TFC TRANSITIONING OVER THE AIRFIELD. PERHAPS THE ATC CTLR THOUGHT WE WERE MAKING RPTS CONCERNING THE L DOWNWIND TFC. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE INCIDENT IS PRESENTLY UNDER INVESTIGATION BY THE FAA. RDM IS A NON FEDERAL CTL TWR. RPTR SAID HE IS ACQUAINTED WITH MOST OF THE 4 CTLRS THAT STAFF THE TWR. APPARENTLY; HE HAS HEARD THE TWR TAPES AND KNOWS HE DID NOT HAVE CLRNC TO LAND. HE BELIEVES WHEN THE CTLR CLRED THE DASH 8 FOR TKOF ON RWY 4; HE MAY HAVE FORGOTTEN THE BE99 LNDG ON RWY 10. HE SAID THE CTLR SOUNDED SURPRISED BUT GAVE THEM CLRNC TO TURN ON TXWY F AND ON TO THE TERMINAL.