Starting Switches For 912 iS?
in 912iS Technical Questions
10 years ago
I note that the two circuits must be completed to start the engine. The regulators for A and B need to be connected together (start power) and then the starter motor switch. The start power circuit needs to be kept connected until the engine reaches 1500 rpm and must then disconnect.
The installation manual shows Two circiut diagrams to achieve this, one with separate start power and starter motor push button switches, the other with a relay to do the start power switch function with the relay controlled by a Stock flight systems EMU which presumably does the disconect at 1500 rpm and also locks out the starter circuit to protect the starter motor while the engine is running.
Question: Will a simple three position ignition key switch coupled with a relay perform the same function? An ignition switch with a starter lockout function costs less than a hundred dollars.
To me, having to push Two buttons simaltaneaously instead of one to do an emergency inflight restart could be dangerous, but spending $3000 to get a single button start seems a waste.
The installation manual shows Two circiut diagrams to achieve this, one with separate start power and starter motor push button switches, the other with a relay to do the start power switch function with the relay controlled by a Stock flight systems EMU which presumably does the disconect at 1500 rpm and also locks out the starter circuit to protect the starter motor while the engine is running.
Question: Will a simple three position ignition key switch coupled with a relay perform the same function? An ignition switch with a starter lockout function costs less than a hundred dollars.
To me, having to push Two buttons simaltaneaously instead of one to do an emergency inflight restart could be dangerous, but spending $3000 to get a single button start seems a waste.
