AFS-BH430-IBF-ICA
Aerospace
Filtration Systems, Inc.
Revision: B
Proprietary Information
Use or disclosure of this material is subject
25
AFS Bell 230 and 430 IBF
to the restrictions on the title page
Instructions for Continued Airworthiness
8.2
COMPONENTS - GENERAL DESCRIPTION
8.2.1
FILTER ASSY / FILTER SEAL
(Refer to Appendix A, Figure A-10 & 11)
a.
Filter Assembly - The Filter Assembly is composed of the filter media (stainless steel mesh
covering cotton gauze) bonded into the aluminum alloy filter frame assembly.
b.
Filter Seals – The Upper Filter has a silicon sponge that is held in place with adhesive and a P-
seal that is held on with a retainer and bolts. The Forward Filter has a P-seal that is held on with
a retainer and bolts.
8.2.2
STRUCTURAL COMPONENTS
(Refer to Appendix A, Figure A-1)
a.
Bell Forward Firewall (OEM Equipment) - The Forward Firewall is part of the original
equipment manufacturer supplied for the 230 and 430 helicopter. For description see Bell 230
and 430 technical manuals.
b.
Structural Assembly / Bypass Door / Seal - The Bypass Door Assembly consists of a machined
aluminum door, a machined aluminum alloy actuator bracket, a military standard (MS)
aluminum alloy hinge and steel pin. The Structural Assembly consists of machined aluminum
components, bent aluminum sheet metal components, mounting provisions for the upper and
forward filter assemblies.
8.2.3
SYSTEMS AND ELECTRICAL COMPONENTS
(Refer to Appendix A, Figure A-12)
a.
Cockpit Switch/Indicator – This switch serves a dual purpose, it activates the bypass door as
well as indicates that the filter is dirty. The switch is a push button type used to open or close
the bypass door. The indicator is a split light that when the filter becomes dirty the upper
segment will illuminate “FILTER” and as soon as the bypass door is fully opened the lower will
illuminate “BYPASS”. The construction details of the component do not warrant field
maintenance. Repair or servicing of this component requires the component to be sent back to
AFS for disposition.
b.
Differential Pressure Switch - The Differential Pressure Switch provides a signal to the Cockpit
Indicator for annunciation of the IBF “FILTER” light to signal that the differential pressure
across the Filter Assembly has reached a preset value. The construction details of the
component do not warrant field maintenance. Repair of this component requires the component
to be sent back to AFS for disposition or replacement.
c.
Filter Maintenance Aid - The Filter Maintenance Aid provides an indication to maintenance
personnel as to the trend of the differential pressure across the Filter Assembly. The
construction details of the component do not warrant field maintenance. Repair of this
component requires it to be sent back to AFS for disposition or replacement. The FMA is an
Summary of Contents for AFS-BH430-IBF-ICA
Page 3: ......