CSP−900RMM−2MD Helicopters, Inc.
Rotorcraft Maintenance Manual
Page 805
Revision 19
28-10-00
7. Supplemental Fuel Check Valve
Modification
A check valve may be installed inside the
supplemental fuel tank to prevent fuel from
flowing from the supplemental fuel tank to the
main fuel tank when the transfer pump is not
on.
Consumable Materials
(Ref. CSP−SPM)
Item Nomenclature
C702 Lockwire
C113 Fuel, Aviation Turbine
Special Tools
(Ref. CSP−SPM)
Item Nomenclature
T1002 Milli−Ohm Meter
(Ref. Figure 804)
(1). Defuel supplemental fuel tank (Ref.
Section 12-00-00).
(2). Remove baggage compartment floor
(Ref. Section 53-20-00).
(3). Remove bolts (1), washers (2), bolts (3),
and washers (4) and remove hat
support channel (5).
(4). Disconnect electrical connector (6) from
top of fuel tank cover (7).
Aviation Turbine Fuel
(5). Remove lockwire (9) and slide hose (10)
to expose end of vent tube (11).
NOTE: Use care when removing fuel tank cov
er, transfer pump wire harness has approxi
mately 10 in. (25.4 cm) of excess length.
(6). Remove bolts (12) and washers (13).
Remove fuel tank cover (7). Remove
and discard packing (8).
(7). Disconnect and remove existing pump
to auxiliary cell outlet hose.
(8). Remove nut (16) and washer (15) from
bulkhead tube fitting.
(9). Install washer (14), four washers (15)
and nut (16) on bulkhead tube fitting.
Torque nut (Ref. CSP-SPM).
Upon installation of check
valve, insure arrow on valve
points in direction of fuel flow in system.
NOTE: Lubricate new packing with aviation
turbine fuel (C113).
(10). Install check valve (17) on bulkhead
tube fitting with new packings (19).
Torque check valve (Ref. CSP-SPM).
(11). Using milli-ohm meter (T1002), test
check valve for a class S electrical bond
(Ref. CSP-SPM).
(12). Attach new pump to auxiliary cell
outlet hose (18) to check valve and
pump fitting. Torque hose (Ref. CSP-
SPM).
(13). Install new packing (8) into groove on
top of fuel tank and install cover with
bolts (12) and washers (13). Torque
bolts (Ref. CSP-SPM).
(14). Slide vent hose (10) to equally cover
gap between vent tubes (11) and install
lockwire (C702) (Ref. CSP-SPM).
(15). Connect electrical connector (6) to
transfer pump connector on top of fuel
tank cover (7).
(16). Install support hat channel (5) with
bolts (3), washers (4), bolts (1), and
washers (2). Torque bolts (Ref. CSP-
SPM).
CAUTION
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