Jabiru j430 - Fuel Vents

Aircraft Technical Manual
Jabiru Aircraft Pty Ltd
JTM001-5
J120, J160, J170, J200/J400, J230/J430, J250/J450 Variants
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Dated: 29th October 2014
Issued By: AS
Page: 228 of 298
8.4 Fuel Vents (all J-Series)
8.4.1 Description
 For aircraft with wing tanks, ventilation is either provided by vented fuel caps or by a “sharks fin” vent
fitted to the cabin roof.
 Where vented caps are used, some models incorporate a check valve to prevent excess fuel leakage
when the aircraft is parked on an angle or flown out of balance.
 For aircraft with wing tanks and a header tank, all three tanks are interconnected to ensure uniform
breather pressure and even feeding from all tanks.
 For aircraft with a single fuel tank fitted behind the crew seats a single vent line is fitted to the
underside of the fuselage.
8.4.2 Inspections
Required Tools:
Rubber glove or balloon
Fuel line clamps
Parts and Material:
Replacement parts (if required)
Type of Maintenance:
Line Maintenance
Level of Certification:
L2 or LAME (A&P or LSA Repairman / Maintenance)
Return to Service:
L2 or LAME (A&P or LSA Repairman / Maintenance)
 Vent lines can become blocked, resulting in fuel starvation of the engine. Also, the vent line, if
plugged, can result in pressure from expanding fuel pressurising the tank.
 The following procedure may be used to check the vent lines for aircraft with wing tanks:
- Have an assistant hold a rubber glove or balloon over the vent tube on one cap.
- Blow into the cap vent on the other wing. If the balloon/glove inflates the breather lines between
the tanks are open and the tanks are cross-feeding.
- Correct any blockage.