RPTR CAPT; CHKING OUT NEW CAPT; CLRED FOR RWY 25R ILS APCH; COMMENCED DSCNT TO MARKER GS INTERCEPT ALT OF 2100 FT. NOT REALIZING THE STEP DOWN ALTS DEPICTED ON THE APCH CHART ARE MANDATORY BECAUSE HIS COMPANY HAD PUBLISHED MISLEADING INFO; RPTR'S ALT CONFLICTED WITH TFC BEING VECTORED FOR THE N COMPLEX AND LOSS OF SEPARATION RESULTED. A RPT WAS FILED AGAINST RPTR AND WAS INVESTIGATED BY THE FSDO. NO PUNITIVE ACTION RESULTED.

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AS DESCRIBED IN A COMPANY FLT STANDARDS LETTER; I WAS DSNDING TO 2100 FT INTERCEPT THE GS AFTER XING BONEZ INTXN. ACCORDING TO SOCAL APCH; THERE IS A 3500 FT MANDATORY XING ALT AT GUMBY. WE CROSSED GUMBY AT 2900 FT; DSNDING. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: CALLBACKS MADE TO SOCAL TRACON AND RPTR CAPT. SOCAL TRACON SUPVR PROVIDED THE EXACT REQUIREMENTS FOR MANDATORY STEP DOWN ALTS FOR THE APCHS TO LAX. WHEN THE WX IS IMC OR NIGHT; THE MANDATORY STEP DOWN ALTS ARE IN EFFECT AND MUST BE FOLLOWED. TFC LNDG ON THE S COMPLEX RWYS; 25R AND L; HAVE THE 3500 FT RESTR AT 'HUNDA' OR 'GUMBY;' WHICH ARE GEOGRAPHICALLY AT THE SAME POINT AND FOR GUMBY; 9.9 DME FROM THE ILS RWY 25R. THE ACFT LNDG ON THE N COMPLEX ARE VECTORED IN FOR INTERCEPTS AT 2500 FT; OR IF ON THE PARALLEL APCH; THE ALT SEPARATION WILL BE MAINTAINED BY THE DIFFERENT ALT RESTRS. THUS; WHEN IN IMC OR NIGHT; THE ALTS ARE MANDATORY. IF THE WX IS VMC; AND THE FLC REQUESTS TO FLY THE GS; IN ALL LIKELIHOOD IT WILL BE APPROVED. THE RPTR CAPT HAD RECEIVED A FLT STANDARDS LETTER FROM HIS COMPANY STATING THAT THE MANDATORY ALTS WERE REQUIRED ONLY ON LOC ONLY APCHS. THINKING THAT; AND CONDUCTING IOE FOR A NEW CAPT; THEY THOUGHT THEY COULD DSND TO THE GS INTERCEPT ALT OF 2100 FT; PLANNING TO INTERCEPT AT 'LIMMA.' BECAUSE THEY WERE DSNDING TO 2100 FT AND HAD ALREADY DSNDED THROUGH THE 3500 FT AT GUMBY AND AT 2900 FT APCH CTLR INTERVENED AND ALERTED THEM. ANOTHER REASON THE ALARMS WENT OFF AT TRACON WAS BECAUSE A B747 TURNING IN FOR THE INTERCEPT FROM THE N; AND FOR THE N COMPLEX RWYS 24R AND 24L; OVERSHOT THE CTRLINE SWINGING CLOSE TO RPTR'S ACFT. SINCE THE RPTR WAS TOO LOW AND THE B747 ALT WAS CORRECT; IT BECAME A LOSS OF SEPARATION AND ATC FILED A RPT AGAINST THE RPTR. THE LCL FSDO INVESTIGATED AND SENT RPTR A LETTER; BUT BECAUSE RPTR'S COMPANY HAD DISTRIBUTED INCORRECT INFO; THE FSDO TOOK NO PUNITIVE ACTION. SUBSEQUENT TO THIS INCIDENT; RPTR'S COMPANY HAS CORRECTED THEIR FLT STANDARDS PUB REGARDING APCHS TO LAX AND NOW ALL FLCS SHOULD BE AWARE OF WHAT TO EXPECT. RPTR IDENTED HIS ACFT AS AN A300.