C172 HAS A CONFLICT WITH A PA34 IN THE PATTERN AT AEG.

Narrative

I WAS APCHING THE ARPT FROM THE W; AT PATTERN ALT. I HAD CALLED 6 NM OUT OVER THE RIO PUERCO; AND AGAIN XING THE ESCARPMENT (3 NM) BEGINNING A 45 DEG ENTRY FOR R DOWNWIND (AS PUBLISHED) RWY 22 AT AEG. I CALLED OVER THE SHOOTING RANGE (2 NM). ALL THESE ARE REGULARLY USED LCL LANDMARKS. WHILE I WAS ON THE 45 DEG; A SENECA CALLED 'ON THE GO' ON RWY 22. I NEVER LOCATED HIM VISUALLY. I SAW ANOTHER ACFT OVER THE RWY AND THOUGHT IT WAS THE SENECA. I WAS OR HAD JUST TURNED DOWNWIND WHEN THE SENECA ANNOUNCED HE WAS XWIND AND THEN INTERRUPTED HIMSELF TO SAY 'OH JESUS.' I LOOKED R AND SAW THE SENECA HEADING FOR ME FROM ABOUT 4 O'CLOCK POS; ROLLING INTO A L TURN TO AVOID ME. HE WAS BELOW BUT CLBING QUICKLY. I BROKE L AS WELL; BUT THE SENECA'S TURN HAD ALREADY ENSURED NO COLLISION. FACTORS: 1) MY 45 DEG ENTRY BROUGHT ME TO THE DOWNWIND LEG TOO CLOSE TO THE DEP END OF THE RWY; RATHER THEN MIDFIELD. 2) I BELIEVE THE SENECA WAS GOING AROUND FROM A PRACTICE INST APCH AND WAS THUS ALREADY WELL ABOVE THE RWY WHEN HE BEGAN HIS CLB. THUS HE WAS AT AN ALT TO TURN XWIND AT OR SHORTLY AFTER XING THE DEP END OF RWY 22. THUS HIS XWIND WAS UNUSUALLY CLOSE IN. 3) PRACTICE INST APCHS AT AEG ARE OFTEN TALKING TO ABQ APCH CTL UNTIL CLOSE TO THE AEG ARPT ENVIRONMENT; SO THEY SOMETIMES HAVE INSUFFICIENT INFO REGARDING ACFT IN THE PATTERN OR APCHING THE PATTERN. 4) MY LOOKOUT WAS INADEQUATE. 5) I HAD GROWN ACCUSTOMED TO USING A NONSTANDARD 45 DEG ENTRY (TOWARD THE DEP END) BECAUSE MOST TFC AT AEG CONSISTS OF TRAINERS THAT FLY LONG UPWIND LEGS TO GAIN ALT. BAD HABIT. 6) RUSTY MULTI-TASKING SKILLS DUE TO NO RECENT FLYING. 7) AEG NEEDS A TWR. TFC IS DENSE AND CONFLICTS ARE FREQUENT.