Originally Posted by
Thud_and_Blunder
ISTR the P2e version of the EC135 (or whatever AirbusH call it this week) separated the static source for aircraft instrumentation (fuselage sides) from the source for ADCs (probes under the nose, later fitted with pilot-with-wash-and-brush-proof 'guards').
Those probes under the nose are Total Temperature Probes for the ADU. The ADU get their static pressure from the same ports as the standby instruments on the rear sides of the aircraft.
Ive flown and tested all sorts of variations of static ports and pitot ports and I don’t think there’s really anything particular to note about a combined sensor. The only point I’d have is that they’ve probably got a combined heat source so lose one heater means lose both pitot and static on that side whereas there might be more redundancy in a split system.