PLTDEV INCORRECT ALT.

Narrative

ON THE THIRD OF 4 LEGS FOLLOWING A STAND-UP OVERNIGHT SHIFT; CRUISING AT 9000 FT; I RECEIVED CLRNC TO 11000 FT. I READ BACK 'ONE-ONE' THOUSAND AND SET 11000 FT IN THE ALERTER. AT 10400 FT ZLA QUERIED AS TO WHETHER WE WERE LEVELING AT 10000 FT. I RESPONDED THAT I HAD BEEN CLRED TO 11000 FT AND WAS CLBING TO 11000 FT. CTR THEN ADVISED THAT THE CLRNC HAD ACTUALLY BEEN TO 10000 FT; AND INSTRUCTED ME TO RETURN TO 10000 FT. VIRTUALLY COINCIDENTAL TO THE CORRECTION; CTR ALSO ADVISED OF TFC AT 12 O'CLOCK (EMB 120) AND SUGGESTED A R TURN 'ABOUT 10 DEGS' HDG CHANGE FOR SEPARATION. THE EMB 120 ALSO TURNED TO ITS RESPECTIVE R. THE SEPARATION DISTANCE AT POINT OF PASSAGE WAS IN EXCESS OF 1 NM AND APPROX 500 VERT FT.MY RECOLLECTION OF CTR COMS JUST PRIOR TO AND DURING THESE EVENTS WAS THE CTR CTLR HAD NOT COMMUNICATED OTHER XMISSIONS TO OTHER ACFT CLRLY; AS CERTAIN XMISSIONS ADDED SOME DEG OF CONFUSION; REQUIRING CALLBACKS. AFTER (SUBSEQUENT LEG) LNDG I WAS ADVISED BY AREA CTL LAND-LINE THAT THE TAPES REVEALED THE CTLR HAD ORIGINALLY ISSUED 10000 FT AND THAT I HAD ORIGINALLY READ BACK 10000 FT. HOWEVER; I HAVE NOT MYSELF HEARD THOSE RECORDINGS. SUPPLEMENTAL INFO FROM ACN 292384: IF WE DID DEVIATE FROM OUR ASSIGNED ALT; THEN WE NEED TO LISTEN TO THE RADIO MORE CLOSELY. ESPECIALLY IN VERY CONGESTED AREAS SUCH AS LAX. THERE'S SO LITTLE ROOM FOR MISTAKES. SECONDLY; COMMUTER AIRLINES SCHEDULING ISSUES SUCH AS STAND-UP OVERNIGHT TRIPS AND RIDICULOUS REST REQUIREMENTS AS THEY ARE TODAY SHOULD BE OVERHAULED TO A LESS VOLATILE SYS. A SYS WHERE CREW SCHEDULING DEPTS CAN NO LONGER TAKE ADVANTAGE OF GRAY AREAS. BY THIS I AM REFERRING THEIR INTERP OF REDUCED REST AS A TOOL; ETC; IN AVIATION ACCIDENTS IS BOUND TO OCCUR; BUT LACK OF REST IS CTLABLE AND SHOULD BE NO REASON. LASTLY; IN OUR CASE; IF THE CAPT DID READ BACK ONE-ONE THOUSAND; THE CTLR SHOULD HAVE CORRECTED THE CAPT'S READBACK; ALL OF WHICH (STANDARD PROC) WOULD HELP US ASCERTAIN OUR GOALS TOWARDS SAFETY; NONETHELESS; CURRENTLY; THE CARDS ARE STACKED AGAINST US.