Pa28 - preflight actions - change to fuller tank
Pilot DAR
I guess I was not very clear in my comment re the Nanchang CJ6. I was agreeing with your comment in an earlier post with respect to ensuring that the engine took fuel from a source that was fully vented under all conditions and that there could never be a situation where the engine fuel pump could air rather than fuel from a tank as long as there was fuel available. Cessna solves this problem by having a gravity feed with a wing side to side interconnected vent system. The Nanchang designers decided to use a centre collector tank mounted below the level of the wing tanks to achieve the same thing. I am not sure what certification standards have to do with this as it is a Military trainer and thus the Chinese air force were not interested in US civil certification. In any case most (all ?) high wing Cessna's with fuel injected engines use the same system for the same reason.
As for your comment about certification standards ensuring a fuel starved, fuel injected engine could be restarted under any circumstances.....well I will bow to your superior knowledge of certification standards. The reason I made the comment was because the C340 that I occasionally fly has a POH note about the possibility of no restart if the engine is fed from a dry tank, and I have seen this caution in other POH's. Perhaps fuel starving a fuel injected engine doesn't come under the definition of "normal operations" that you quoted ?
I guess I was not very clear in my comment re the Nanchang CJ6. I was agreeing with your comment in an earlier post with respect to ensuring that the engine took fuel from a source that was fully vented under all conditions and that there could never be a situation where the engine fuel pump could air rather than fuel from a tank as long as there was fuel available. Cessna solves this problem by having a gravity feed with a wing side to side interconnected vent system. The Nanchang designers decided to use a centre collector tank mounted below the level of the wing tanks to achieve the same thing. I am not sure what certification standards have to do with this as it is a Military trainer and thus the Chinese air force were not interested in US civil certification. In any case most (all ?) high wing Cessna's with fuel injected engines use the same system for the same reason.
As for your comment about certification standards ensuring a fuel starved, fuel injected engine could be restarted under any circumstances.....well I will bow to your superior knowledge of certification standards. The reason I made the comment was because the C340 that I occasionally fly has a POH note about the possibility of no restart if the engine is fed from a dry tank, and I have seen this caution in other POH's. Perhaps fuel starving a fuel injected engine doesn't come under the definition of "normal operations" that you quoted ?
