BobsV35B(at)aol.com
Guest
|
 Posted: Tue Oct 23, 2007 6:26 am Post subject: Electrically Driven Fuel Boost Pump |
 |
|
Good Morning OC,
Normal procedure would have the auxiliary pump turned off for takeoff.
The fuel control system used on the stock A36 uses engine RPM as one of the determinants of fuel flow. If the auxiliary pump is used, it sends out the maximum amount of fuel possible regardless of the engine RPM. Consequently, if the pump is used on the ground at low RPM, the engine will flood and may quit. However, at very high power settings, the fuel flow may increase slightly with the auxiliary pump turned on or it may not affect engine operations at all.
Whether it does or not is dependent on just which engine is installed and how strongly the auxiliary pump pumps.
Normal procedure is to have the pump off unless the fuel flow is low or unsteady. If either of those events occur, the auxiliary pump should be turned on. That could cause a rough running engine, but that rarely happens. Generally speaking, if the engine pump is operating normally during full power operation and the auxiliary pump is turned on there will be a small power loss from the overly rich mixture. The manual suggests that the engine be manually leaned if that does happen.
If the throttle is retarded while the auxiliary pump and the engine pump are both operative, a serious power loss could occur.
In any case, it is highly unlikely that the auxiliary fuel pump played any part in this accident.
Stranger things have happened though!
Any help at all?
Happy Skies,
Old Bob
AKA
Bob Siegfried
Ancient Aviator
Stearman N3977A
Brookeridge Air Park LL22
Downers Grove, IL 60516
630 985-8503
In a message dated 10/23/2007 8:30:18 A.M. Central Daylight Time, bakerocb(at)cox.net writes:
| Quote: | I would appreciate it if someone familiar with the Beechcraft A36 airplane
would review the below accident initial report and let us know if the A36 is
one of those airplanes that is supposed to have the electrically driven fuel
boost pump OFF for takeoff and landing.
http://www.ntsb.gov/ntsb/brief.asp?ev_id=20071022X01627&key=1
Thank you.
|
See what's new [quote][b]
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
|
|
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
