"Larry Dighera" wrote in message
...
Given the fact that the aux fuel system was a modification upon which
your safety depended, did you personally take the time to analyze its
intended operation from the schematic diagram and description of
system operation (not its use, but how it was engineered to operate)?
I believe you are intelligent enough to have done a reasonable job of
system analysis without benefit of specific training or an appropriate
college degree.

Yes, I looked at the system!


and so did the engineer that designed it and
wrote the instructions for it's usage! I would also assume so did the faa
inspector that approved the system description and usage instructions.
Once
you go changing the factory fuel system design you go from the engineered
description of the now modified fuel system.

If I understand your story correctly, the cause of the wing tank
venting was a result of the fuel return line pouring fuel that was
being feed from the separate aux tank fuel system into the wing
tank(s). Is that correct?

The aux tank was connected directly to the engine after the aircraft fuel
system, Not to the wing and the provided documentation and system
description mentioned nothing about the fuel return to the main tanks. The
description also stated that it was connected after the aircraft fuel
system.


They left out something very very important in the new systems
description!

Are you referring to the necessity to burn fuel from the wing tanks
before switching to the aux tank, so that there would be adequate room
in the wing tanks to hold the fuel being returned from the fuel
injection system?

Correct, They failed to mention this the description and instruction
provided!

therir instruction basicaly short and simple! Climb to altitude on both
tanks aircraft tanks once at altitude switch to ferry tank until specified
mark on aux tank near empty then switch back to aircraft fuel.

Now!! If the instructions stated to run on the left tank till near empty
then switch to the ferry tank and monitor the left tank fuel quantity and
return to aircraft fuel and switch ferry tank off when left tank was almost
full about 2 hours flight time this little problem would not have happened.
The Greenland CAA took a copy of the instructions and fuel system
description and copy of Cessna description of the problem and will be
contacting the ferry tank mfg and installer telling them to correct their
system instructions.


Can you provide the manufacturer's name and model number for the aux
fuel system installed in the aircraft you delivered?

The Ferry tank was Manufactured And Installed By Telford Aviation In Bangor,
Maine. In the future I will try and avoid this company or flying with this
company's installed equipment if at all possible and if I am to use them
(Not Likely) I will require them to provide a full schematic of the system
and talk with them more to support their documentation. Another thing that
****es me off when I called the company (telford) to help with the problem
they were rude and said there instruction were correct and that it was not
their problem! Cessna support and the weekend A&P in Greenland were the best
they had a solution with in a few hours after faxing the instructions to
them and are also writing a letter to Telford explaining the problem with
their instructions.


How large is the documentation of the aux fuel system? Is it possible
you could make a scanned copy available? In particular, I'd like to
see a schematic drawing of the system and the description of its
operation, and its operation use instructions, in that order.

No schematic was available only textual description of the fuel system and
its operation. All paperwork was given to new owner and there was no photo
copy machine available in Beirut at time of delivery for me to make a copy
for myself. The Greenland CAA made copies of all paperwork and said they
will forward me copies of all paperwork.