AVSIG: R44 Raven II mechanical fuel pump wwswsigarch.jpg (7236 bytes)

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AVSIG Discussion Sections >> Robinson

Anne Umphrey (KBED)
Top Gun


Reged: 04/28/04
Posts: 12756
Loc: KBED
Re: R44 Raven II mechanical fuel pump
      09/20/10 07:45 AM

Here is Paul's answer. Paul is a very experienced R44 pilot and knows it inside and outside.



Quick answer about testing the fuel pump: Yes.

Longer answer: There are two times the engine is running solely on the mechanical fuel pump: when you first start, but have not switched the clutch switch to the engage position, and during shutdown when you are disengaging the clutch.

The description of the fuel pumps is, I believe, in the Systems section of the POH where it talks about the electric pump being controlled with the clutch switch.

I took a quick look at the NTSB site and there were no accidents in Raven IIs due to fuel pump failures. This doesn't say that there has never been a dual pump failure, just that if there was such a failure it didn't result in an accident.

While you might devise a startup procedure to test the mechanical fuel pump, my personal feeling is that the chance of a double pump failure is very small and probably not worth worrying about given that you do test the mechanical fuel pump at the end of every flight. If Robinson though this was a likely failure, you would expect that there would be a test procedure incorporated into the startup sequence.

--------------------
You haven't seen a tree until you've seen its shadow from the sky.
- Amelia Earhart, 1897 - 1937

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Entire topic
Subject Posted by Posted on
* R44 Raven II mechanical fuel pump LouisC Grenierz 09/18/10 11:08 PM
. * * Re: R44 Raven II mechanical fuel pump Anne Umphrey (KBED)   09/20/10 07:45 AM
. * * Re: R44 Raven II mechanical fuel pump LouisC Grenierz   09/25/10 06:31 AM
. * * Re: R44 Raven II mechanical fuel pump Russell Holton   09/20/10 01:50 PM
. * * R44 Raven II mechanical fuel pump Ray Tackett   09/20/10 08:51 PM
. * * Re: R44 Raven II mechanical fuel pump B. Butler (Oregonian)   09/21/10 12:24 PM
. * * Re: R44 Raven II mechanical fuel pump Evad Rellimhtug   09/21/10 02:30 PM
. * * Re: R44 Raven II mechanical fuel pump Terry Carraway   09/21/10 06:54 AM
. * * Re: R44 Raven II mechanical fuel pump Ralph Jones   09/21/10 09:17 AM
. * * Re: R44 Raven II mechanical fuel pump Sean Franklin   09/21/10 08:15 AM
. * * Re: R44 Raven II mechanical fuel pump Terry Carraway   09/22/10 04:23 PM
. * * Re: R44 Raven II mechanical fuel pump Jeff Hartmann CIC   09/21/10 08:46 AM
. * * Re: R44 Raven II mechanical fuel pump Evad Rellimhtug   09/19/10 08:03 PM
. * * Re: R44 Raven II mechanical fuel pump Anne Umphrey (KBED)   09/19/10 05:23 PM

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