AFS-BH430-IBF-ICA
Aerospace
Filtration Systems, Inc.
Revision: B
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6
AFS Bell 230 and 430 IBF
to the restrictions on the title page
Instructions for Continued Airworthiness
pressure normally experienced with the Particle Separator installed. Upon illumination of the
IBF “FILTER” caution light, the pilot must closely monitor the engine instruments and if
engine performance degradation is evident the pilot should push the cockpit switch, labeled IBF
1 or IBF 2, to activate the actuator and open the bypass door for the respective engine. This will
cause the upper segment of the switch, labeled “FILTER”, to extinguish and the lower segment
of the switch, labeled “BYPASS”, to illuminate. The electromechanically actuated bypass door
permits unfiltered air to enter the engine inlet plenum chamber should the filter media become
obstructed, and can be opened or closed as required (See Picture 2).
On the ground, a Filter Maintenance Aid is mounted to the L/H and R/H Plenum Assy, which
can be viewed by opening the inspection door on the Air Intake Cowling, displays the
maximum differential pressure across the filter reached during the last flight. It is accessible
only on the ground, providing the pilot or mechanic the ability to visually gauge the current
condition of the filter. This gives the mechanic the ability to forecast the timing of the next
service cycle. The Filter Maintenance Aid can be reset by depressing the yellow button marked
“PUSH TO RESET” located on the end of the Filter Maintenance Aid (See Picture 1).
e.
The design of the bypass system allows the ground crew to cycle the bypass door with power on
the aircraft. The switch can be pushed to actuate the bypass door open, and then pushed again to
actuate it closed. Full functional verification of the bypass system including all
electromechanical components and the filter maintenance aid is possible during routine
maintenance (see Chapter 8).
f.
Removal of the filter assemblies for servicing is achieved by removal of sixteen (16) bolts after
the Air Inlet Cowl and Plenum Assy have been removed.
g.
The engine wash can be accomplished with the IBF installed, in the same manner prior to
installing the IBF system.
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