Extra 300/SC, Maintenance Manual

Page: 99 / 250

CHAPTER 28
PAGE 8
MAINTENANCE MANUAL EXTRA 300/SC
PAGE DATE: 12. February 2019
28-10-00 STORAGE
Description and Operation
The EXTRA 300/SC is equipped with two independent fuel
systems: The acro- and center tanks system and the wing tank
system.
The acro tank (1, Figure 2) incorporating an inverted flight
fuel supply system is mounted in the fuselage just behind the
firewall. It is connected to the front (2) and rear (3) center
tank by flexible hoses. The acro and center tanks are fastened
to the fuselage by means of metal attachment belts (5).
Fueling the center tanks is by means of two fuselage 2"
diameter filler caps. For leak detection the acro and center
tanks are furnished with a GRP tank shell. In case of leakage
blue colored fuel is shining through. The acro and center
tanks are grounded. The acro tank deaerates (6) into the rear
center tank. Both center tanks deaerate by ventilation tubes
(6) ending at the right side of the main landing gear spring.
The root section of each wing – in front of the main spars –
forms an integral fuel tank of approximately 150 cm (59")
length (4). Each wing tank has a 2" diameter filler cap for
gravity fueling. Sealing lips are installed at the filler necks
inside the wingtank. For sealing Scotch Clad 776 (see Chapter
51-30-04) has been applied to the inside of the wing tanks.
For lightning protection reason the shell in the area of the
wing tank has an outer layer of carbon fiber with incorpo-
rated aluminium thread (also refer to Chapter 57). The wing
tanks are grounded. Each tank is provided with an alu
ventilation tube (6) for adequate venting. The ventilation
tubes are interconnected to a main tube (6), ending outside
of the fuselage at the right side of the main landing gear
spring.