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Technical Support for Comanche System

 

 

OSBORNE Kit P/N 4009-1, -2 and –3 Piper Comanche models PA24-180, PA24-250, PA24-260 

OSBORNE Tip Tank kit(s) and installation requires removal of the factory selector valve and replaced by the OSBORNE fuel selector valve assembly. 

OSBORNE fuel selector valve assembly accommodates the added Tip Tanks.  This fuel selector assembly consists of two (2) each selector handles.  Each handle is used to select its respective fuel tank side i.e. Right hand handle selects RH Tip Tank, wing aux tank (if installed) and RH main tank, Left hand respectively .  The advantage of this design allows any individual tank selection.


Description


Probable Cause

Correction
Selector valve(s) turns hard Worn out Replace
Valve handles hit each other when selecting cross feed (both tips) Wrong handles and or valve assembly Replace with correct assembly
Valve is hard to turn Worn out/dry  Grease seat and replace shaft seal
Fuel stain at selector shaft Worn out/dry Grease seat and replace shaft seal
Fuel bypassing valve  Worn out, foreign  Debris caught in seat Replace valve
Handle is loose  after installation of new clevis pin  Worn out handle  and or selector valve shaft Replace handle/valve assembly
Valve handle is attached to selector shaft with a screw on type (handle) Non approved valve Replace with approved part assembly
Valve turns with no feel  or tank position detenting   Wrong selector valve body or worn out detent assembly Replace with approved part assembly

Fuel gauge: See 55027

Fuel Transmitter: see 55025 

OSBORNE Kit P/N 12070-1 Comanche PA30 and PA39 

Brief Description: Tip Tank fuel lines are routed inboard to just outboard of the main selector valve were the OSBORNE “Aux Tip valve” is located, splicing the two (2) tanks.  The feed from these tanks are controlled by the cockpit “Aux Tip” selector switch and of course the main selector valve selected to “Aux”.


Description


Probable Cause

Correction
Tip Tank fuel is bypassing (siphoning) into wing Aux Bad Aux Tip Valve Replace
Tip Tank will not feed  1. Clogged vent line

2. Aux Tip valve bad Tip selector (electoral) switch

3. Faulty Aux 

4. Check power source  to Aux Tip valve
Clean

Replace


Replace


Replace
Fuel Transmitter: see 55025