CSP−900RMM−2MD Helicopters, Inc.
Rotorcraft Maintenance Manual
Page 433
Original
28-00-00
15. Fuel Cell Frangible Valve
A. Fuel Cell Frangible Valve Removal
(Ref. Figure 413)
NOTE: This task is typical for LH and RH Fuel
Cell Frangible Valve removal.
Aviation Turbine Fuel
(1). Defuel helicopter (Ref. Section
12-00-00).
(2). Remove cabin seats, if applicable (Ref.
Section 25-20-00).
(3). Remove carpet, if applicable (Ref.
Section 25-20-00).
(4). Remove cabin floor panels; AL165,
AR165, A170, A217, AL230, AR230,
A235, AL250 and AR250 as required
(Ref. Section 53-20-00).
Residual Fluids
System Contamination
(5). Remove aft fuel cell access cover (Ref.
Section 28-00-00).
(6). Remove and discard lockwire securing
fuel line vapor shroud (1). Disconnect
vapor shroud hose from fuel intercon
nect tee fitting vapor shroud box (2).
(7). Disconnect nut on frangible valve (3)
hose assembly from fuel interconnect
tee fitting (4).
(8). Remove and discard lockwire and
remove drain tubing connector (5) and
rubber tubing (C606) (6) from vapor
shroud.
(9). On earlier serial number helicopters,
sealing compound is applied. Carefully
remove sealing compound from fasten
ers and flange surfaces of frangible
valve flange junction with keel beam
(Ref. CSP-SPM).
(10). Remove bolts (7) and washers (8)
attaching vapor shroud to keel beam
and fuel cell.
NOTE: During removal of frangible valve, take
precaution to retain gasket (14) between
fuel cell outlet fitting and keel beam.
(11). Remove vapor shroud (1) and spacer
(11) from frangible valve (3) hose
assembly.
(12). Disconnect fuel hose assembly (12)
ratchet end connector from frangible
valve (3) inside fuel cell. Pull back on
end to disengage ratchet, then unscrew.
(13). Remove bolts (9) and washers (10)
attaching frangible valve (3) to fuel cell.
Remove frangible valve from inside of
fuel cell and discard O-ring (13).
B. Fuel Cell Frangible Valve Installation
(Ref. Figure 413)
NOTE: This task is typical for LH and RH Fuel
Cell Frangible Valve installation.
Consumable Materials
(Ref. CSP−SPM)
Item Nomenclature
C109 Grease
C205 Sealing Compound
C606 Rubber Tubing
C702 Lockwire
(1). Prepare frangible valve surface for
electrical bonding (Ref. CSP-SPM).
Grease (C109)
(2). Lubricate O-ring (13) with grease
(C109) and install on frangible valve (3)
hose assembly.
(3). Install frangible valve in fuel cell with
hose through fuel cell.
(4). Install fitting gasket (14) between fuel
cell fitting and keel beam and install
frangible valve hose assembly through
keel beam.
CAUTION
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