The cabin altitude warning pressure switch maintenance manual wiring diagram did not provide a clear indication of the wiring connections for the superseded switch.
Manufacturer had decided to change publication to reflect ATSB concerns.
A technical Publications Change Request (PCR) has been submitted to change the Beechcraft Electrical Wiring Diagram Manual, P/N 90-590012-15, Cabin Pressurisation diagram covering LJ-919 to identify the cabin altitude warning switch poles NO and NC as follows
The ATSB is satisfied that the action by the aircraft manufacturer will, when included in the maintenance manual wiring diagram, adequately address the safety issue.
