A320
Flight Crew Air Transport Pilot (ATP); Flight Crew Commercial; Flight Crew Instrument; Flight Crew Multiengine
Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy
Chart Or Publication
The OAKES2 arrival MONOH transition for 30 presents a trap for flight crew members.  If we reference 10-7A; it is noted that aircraft operating at OAK may be below the Class B shelf.  The 10-1B provides a depiction of the airspace; but is useless with no identifying fixes; DME; radial; etc.  Upon review of the high altitude chart and cross referencing fixes; I noted that the OAKES2 STAR will take you below Class B airspace if flown at the lower altitude limits. FFIST HAS A STAR window of 7;000 - 9;000 [feet]. While the Class B shelf starts at 8;000 [feet] and PRFCT above 5;000 [feet]; Class B shelf begins at 8000 [feet]. There is no reference on the STAR of exiting the airspace and no mandatory speed markings below the 280 KTS mandated on the chart. (Standard transition at 250 [knots] at 10;000 [feet].) In order to properly identify the Class B airspace; we had to overlay our arrival on the high altitude charts. It is not standard practice to reference hi altitude charts on the arrival. This creates an obvious trap for our crew members.
A320 First Officer reported that the OAKES2 STAR will take you below class B airspace if flown at the lower altitude limits.