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PA-30 Take off Fuel Flow
What are you seeing?
T210DRVR- ICS member
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- Joined: Sat May 03, 2008 4:31 am
- Location: So. Oregon
Is your take-off roll as expected? If it is then I'd suggest the old - check the gauge by topping the tanks, flying at power settings you think you should burn 16 gph per side for a certain time increment and then top the tanks again and see how much you burned.
If the take-off roll isn't per POH, then there's a different issue and you need someone with greater mechanical knowledge than me to help.
Patricia Jayne (Pat) Keefer ICS 08899
PA-39 #10 Texas
N3322G- ICS member
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- Location: Fort Worth, Texas area
-Zach
Zach Grant L1011jock- Technical Advisor
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For all practical purposes I use the JPI fuel flow as primary. I regard the pressure type gauge as an aid to troubleshooting, but other than that it just takes up space in the panel while keeping the airplane legal.
Best,
Jay
PA 30 N7702Y
Jay- ICS member
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- Location: Portland, Oregon
PA30 Take Off Fuel Flow
The right engine seemed to be developing full power on take off and the temperatures and pressures were normal ...... but I would not accept the low reading.
We checked all the plumbing for both engines and found no defects. I finally switched the lines at the gages and the problem moved to the other gage.
After all of the above, I sent the right Bendix unit back for checking.
It was found that an improper venturi had been installed during the overhaul process.
The corrected unit shows 16 GPH on takeoff now.
A. H. Powers ICS 2978
- SLIMDREDGER
- ICS member
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Re: PA-30C Take off Fuel Flow low on right side
- HUESTERSHOOTER
- Posts: 2
- Joined: Sat Jan 11, 2003 9:10 pm
- Location: Jensen Beach, Fl
Re: PA-30 Take off Fuel Flow
There are some more ideas in the trouble shooting section of the Service Maunal, end of Chapter IX. Free under the Tech Tab on the home Page of this site. Assume your mechanic has this at their side.
Given this is your first post, the Twin may be new to you. No offense intended but below is the fuel hygiene we use and has worked well.
N3322G FUEL HYGIENE
This is the process we use to sump fuel on our Twin Comanche. It has evolved from the methods we were taught. The results are that the fuel sump screens are remarkably clean at each 50 hour AD inspection – so much so that shops have commented upon their cleanliness. Sumped fuel has been entirely water and debris free for almost two years or more of flying. I should mention that all bladders were replaced in 2009/2010, fuel door seals are fresh, engine fuel lines are happy and I do my best to keep the fuel caps in good condition. When home, the aircraft is hangared in Texas where the heat eats rubber for lunch.
1. Before the first flight, place 30 qt sterlite bin bottom under sump drain lines (or something that will catch fuel)
2. Start with selectors on main tanks
3. Sump right main by holding up rear sump drain
4. While holding sump open, change to right aux (notice movement of mechanism in sump area)
5. While holding sump open, change right selector to crossfeed
6. Release sump drain
7. Return selector to right main
8. Sump left main by holding up forward sump drain
9. While holding sump open, change to left aux (notice movement of mechanism in sump area)
10. While holding sump open, change left selector to crossfeed
11. Release sump drain
12. Return selector to left main
a. If fuel in tips - with selector on right aux, turn on master and switch to right tip
b. Sump right tip by holding up rear sump drain
c. Return switch to aux
d. Return selector to right main
e. If fuel in tips - with selector on left aux, turn on master and switch to left tip
f. Sump left tip by holding up forward sump drain
g. Return switch to aux, master off
h. Return selector to left main
13. Check fuel in bin. If debris, individually sump tanks until sumped fuel is clean
a. If fuel in tips, sump right tip external sump on tip
b. If fuel in tips, sump left tip external sump on tip
c. If nacelle tanks have fuel sump at external sump valves both sides
d. If Miller wet wings have fuel, sump at external sump valve on both sides
14. Fly
15. Fuel main and aux tanks (and any other desired tanks)
16. After last flight of day, sump main and aux tanks again.
Hope this helps.
Patricia Jayne (Pat) Keefer ICS 08899
PA-39 #10 Texas
N3322G- ICS member
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- Location: Fort Worth, Texas area
Re: PA-30 Take off Fuel Flow
When did the fuel flow problem start? If it wasn't there before the O/H, that might be a staring place.
Patricia Jayne (Pat) Keefer ICS 08899
PA-39 #10 Texas
N3322G- ICS member
- Posts: 1911
- Joined: Thu May 08, 2008 1:58 pm
- Location: Fort Worth, Texas area
Re: PA-30 Take off Fuel Flow
- HUESTERSHOOTER
- Posts: 2
- Joined: Sat Jan 11, 2003 9:10 pm
- Location: Jensen Beach, Fl