Donaldson AFS-BH430-IBF-ICA, Instructions Manual

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AFS-BH430-IBF-ICA Aerospace Filtration Systems, Inc.
Revision: B Proprietary Information
Use or disclosure of this material is subject
18
AFS Bell 230 and 430 IBF
to the restrictions on the title page Instructions for Continued Airworthiness
7 SERVICING
7.1 AUTHORIZED MATERIALS
Service AFS Filter Assemblies with only AFS approved filter oil or AFS authorized substitutes.
NOTE
Refer to Chapter 8 for removal, inspection, repair and installation of filter
assembly. Upon satisfactory inspection and any required maintenance of the
filter assembly proceed with the rest of the servicing instructions for the filter
assembly.
7.2 FILTER SERVICE INTERVALS
The filter service interval is based on the specific aircraft operating environment. The filter service
intervals section is broken up in three parts: general requirements pertaining to all operations,
specific recommendations for operations on prepared fields, and for operations in severe
environments.
7.2.1
GENERAL REQUIREMENTS
NOTE
The maximum filter service interval between cleanings under any conditions
is 300 flight hours or 1 year TIS, whichever comes first. Up to the TIS limit,
the filter is considered an “on-condition” item. For consistent performance
AFS recommends that all Filter Assemblies be serviced at the same time.
NOTE
The FMA is an aid to help maintenance personnel and pilots to ascertain the
condition of the filter at any point in time or to trend the accumulation of
dirt on the Filter Assembly over a period of time.
a. Up to the 300 hour / 1 year TIS limit, the “on condition” requirement for servicing the Filter
Assembly is based on a FMA indication, an IBF “FILTER” light indication on the cockpit
indicator or upon a failed PAC (where the failed PAC is the result of a dirty Filter Assembly).
b.
Any IBF “FILTER” indication, where the pressure sensor and indicating system are working
properly, requires servicing of the filter assembly. See filter servicing Section 7.3.
c.
The gradual increase in differential pressure across the IBF filter assembly causes an increase in
MGT required to produce a specified torque as measured during the PAC. A failed PAC due to
an increase in differential pressure across the filter is cause for servicing of the filter assembly.
See filter servicing Section 7.3.