AN ENG PROB LEADS TO AN EMER DECLARATION AND A SINGLE ENG ARR AT A MAJOR ARPT BY AN ACR. A GAR IS ORDERED BY THE LOCAL CTLR BECAUSE DEP TFC IS JUST BEGINNING ITS TKOF ROLL ON THE SAME RWY.

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ABOUT 10 DME NORTH OF DRAKE; WE EXPERIENCED A COMPRESSOR STALL ON #1 (LEFT) ENG. (FOUND OUT LATER THE #4 MAIN BEARING FAILED). ABOUT THAT TIME WE WERE HANDED OFF TO PHX APCH AND THEN GIVEN THE BRUSR ARR. WE INFORMED APCH OF OUR STATUS AND AGREED WITH THEM TO DECLARE EMER; HAVE EQUIP STANDING BY. WE DECIDED TO LEAVE THE ENG RUNNING AT IDLE SINCE ALL PARAMETERS WERE IN THE GREEN. WE ACCOMPLISHED THE APPROPRIATE CHKLISTS. VECTORED TO FINAL FOR RWY 7L AND CLRED FOR THE VISUAL APCH. SHOT THE APCH FLAPS 15 ON THE GOOD ENG BUT RECEIVED 'GO AROUND' FROM PHX TWR ON SHORT FINAL DUE TO AN ACFT BEGINNING THE TKOF ROLL. WE MISSED APCH FOR A VISUAL RIGHT DOWNWIND RETURN FOR LNDG. I QUESTION WHY AN ACFT WAS ON OUR RWY GIVEN OUR CIRCUMSTANCES. EQUIP IN POSITION ON THE FIELD WHILE IT WAS ROLLING FOR TKOF. OUR DECLARED EMER WAS AT LEAST 6-7 MINS PRIOR TO LNDG. OTHER THAN THE MISSED APCH PROCEDURES AND HANDLING WENT WELL. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: CALLBACK REVEALED THAT THE DECLARATION OF THE EMER WAS SUGGESTED BY APCH CTL WHEN THE CREW RPTED THEIR PROB AND THE CAPT CONCURRED. THE INFO WAS PROBABLY HANDED OFF TO THE TWR SINCE EMER VEHICLES WERE STANDING BY AT THE RWY FOR THE ARR. IT IS NOT KNOWN WHEN THE TKOF CLRNC WAS GIVEN FOR THE ACFT ON THE RWY; OR WHETHER THE DEPARTING ACFT DELAYED ITS TKOF ROLL; BUT THE RPTR'S ACFT WAS AT LESS THAN ONE MILE ON FINAL WHEN THE GAR WAS ISSUED. THE RPTR ALSO SAID THAT THE SPACING LOOKED TOO TIGHT AND HE WAS ABOUT TO INITIATE A GAR WHEN THE CTLR ISSUED IT. AT THAT TIME THE DEPARTING ACFT WAS JUST PASSING THE RWY MARKING NUMBERS. THE APCH SPEED FOR THE RPTR'S ACFT BECAUSE OF THE SINGLE ENG APCH CONFIGURATION WAS 153 KNOTS.