Pump 1 intermittent fault
in 912iS Technical Questions
6 years ago
Hello all,
I have a fault on pump 1 which I have narrowed down to the following:
Start Power ON: pump 1 (and 2) work fine.
Engines starts fine on pump 1 only.
After engine start, turn OFF Start Power: engine still runs fine on pump 1 only.
Turn pump 2 on: engine runs fine.
Turn pump 2 off: engine stops and pump 1 is no longer running.
Behaviour is same if accelerate engine to switch over from alternator B to alternator A.
It seems that turning on pump 2 is somehow switching pump 1 onto another power circuit, which in turn has a fault or loose connection.
I'm taking it to a Rotax service agent on Friday to plug in the diagnostics and see what that shows, but would be grateful for any suggestions on where to look as they have never seen this behaviour either.
Engine has done 130 hours and this has only appeared recently. Aircraft is a kit-built Bristell NG5..
TIA, David
I have a fault on pump 1 which I have narrowed down to the following:
Start Power ON: pump 1 (and 2) work fine.
Engines starts fine on pump 1 only.
After engine start, turn OFF Start Power: engine still runs fine on pump 1 only.
Turn pump 2 on: engine runs fine.
Turn pump 2 off: engine stops and pump 1 is no longer running.
Behaviour is same if accelerate engine to switch over from alternator B to alternator A.
It seems that turning on pump 2 is somehow switching pump 1 onto another power circuit, which in turn has a fault or loose connection.
I'm taking it to a Rotax service agent on Friday to plug in the diagnostics and see what that shows, but would be grateful for any suggestions on where to look as they have never seen this behaviour either.
Engine has done 130 hours and this has only appeared recently. Aircraft is a kit-built Bristell NG5..
TIA, David
