11. Install the filter bowl on the filter housing. Tighten
90 lbf·ft (122 N·m).
12. Close the bleed valve on the manifold and open
the manual fuel shutoff valve on the fuel panel.
13. Open the fuel cylinder shutoff valves.
14. Using a methane detector, leak test all fuel sys-
tem components between the fuel cylinders and
the solenoid valve. A bubble solution can be
used to pinpoint the exact location of leaks.
Repair or replace any leaking components.
15. Using the two capscrews removed previously,
install the access cover on the fill panel.
47–07 CNG Fuel Cylinder
Inspecting
Have a qualified inspector inspect compressed natu-
ral gas (CNG) fuel cylinders for damage or deteriora-
tion. Note cuts, cracks, gouges, abrasions, discolor-
ation, broken fibers, loose brackets, damaged
gaskets or isolators, heat damage, or other prob-
lems.
Refer to Compressed Gas Assocation (CGA) pam-
phlet C-6.4,
Methods for External Visual Inspection of
Natural Gas Fuel Containers and Their Installations,
for inspection requirements and inspector qualifica-
tions.
For more information, go to
04/22/2010
f470554
1
2
3
4
5
7
8
6
1.
Fuel Cylinder Storage
Box
2.
Fuel Cylinder Shutoff
Valves (qty 5)
3.
High-Pressure Gauge
4.
Low-Pressure Gauge
5.
Fuel Fill Port
6.
Dust Cap
7.
Manual Shutoff Valve
8.
Fuel Panel Access
Door
Fig. 9, CNG Fuel Cylinder Storage Box (5-cylinder
system shown)
05/04/2010
f470557
2
2
3
4
5
6
7
8
1
1.
Fuel Panel Access
Cover
2.
Capscrews (qty 2)
3.
Wiring Harness
4.
Pressure Relief Valve
and Cap
5.
Coolant Outlet Line
6.
Coolant Inlet Line
7.
Fuel Inlet Line (to fuel
cylinders)
8.
Fuel Outlet Line (to
engine)
Fig. 10, CNG Fuel Panel Assembly
Fuel
47
Business Class M2 Maintenance Manual, August 2015
47/10
Property of American Airlines
