P-80 turbine stops in the air
09-18-2002, 06:07 PM
#1
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P-80 turbine stops in the air
Dear Sirs,
At the moment we are testing and flying Hot Spot and
Kangaroo/P-80.
But now we have some problems with P-80 and need help:
We did 7 flights but had 4 stops of P-80 in the air.
The all turbine modes on the ground is fully OK.
We changed fuel ( Jet A-1/ deodorized kerosene).
GSU said that in all stops reason for shut down was "Last off cond - Low RPM".
In all cases plane has 500-1000 ml in the tanks after stops.
The throttle position and plane position in the air were different before stops.
It was four flight days with different weather conditions: t= 24,15,9,13C.
Starts was OK all the time.
What can recommend us?
P-80 has modificated RPM-Sensor (in the tubes).
At the moment we are testing and flying Hot Spot and
Kangaroo/P-80.
But now we have some problems with P-80 and need help:
We did 7 flights but had 4 stops of P-80 in the air.
The all turbine modes on the ground is fully OK.
We changed fuel ( Jet A-1/ deodorized kerosene).
GSU said that in all stops reason for shut down was "Last off cond - Low RPM".
In all cases plane has 500-1000 ml in the tanks after stops.
The throttle position and plane position in the air were different before stops.
It was four flight days with different weather conditions: t= 24,15,9,13C.
Starts was OK all the time.
What can recommend us?
P-80 has modificated RPM-Sensor (in the tubes).
09-19-2002, 01:25 PM
#2
Hello
You are having the same problem as the other poster, with the same response
What you are describing is a flame out. It is most likely caused by air in the lines, or a restriction in the fuel system that the system cannot compensate for at idle before shutting off.
I suggest running a very large standard clunk (not pleated or filtered), triple check all connections and run a UAT. Make sure you do not have a kink in the feed line out of the UAT near the nipple, you can get small bubbles there sometime. Make sure the fuel filter in the plane is oriented vertically, sometime bubbles can build up int he filter if it is mounted horizontally.
Good Luck,
What you are describing is a flame out. It is most likely caused by air in the lines, or a restriction in the fuel system that the system cannot compensate for at idle before shutting off.
I suggest running a very large standard clunk (not pleated or filtered), triple check all connections and run a UAT. Make sure you do not have a kink in the feed line out of the UAT near the nipple, you can get small bubbles there sometime. Make sure the fuel filter in the plane is oriented vertically, sometime bubbles can build up int he filter if it is mounted horizontally.
Good Luck,
