AFS-BH430-IBF-ICA
Aerospace
Filtration Systems, Inc.
Revision: B
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19
AFS Bell 230 and 430 IBF
to the restrictions on the title page
Instructions for Continued Airworthiness
d.
Any FMA indication in the area marked in “RED” requires servicing of the filter assembly. See
filter servicing Section 7.3.
e.
At any time prior to an IBF “FILTER” indication on the cockpit indicator, an FMA indication in
the “RED”, or a failed PAC, when maintenance or flight personnel see a trend on the FMA that
would warrant servicing of the filter due to operational considerations, such as when the aircraft
will be operating in a remote or off-site location without the ability to readily service the filter,
the filter may be serviced, or replaced. See filter servicing Section 7.3.
f.
The maximum number of service cycles for the filter assembly (i.e., cleaning / oiling) is limited
to 15 for each filter assembly. The filter assembly includes a data plate that must be scribed to
track filter service cycles in accordance with Section 6.2.
7.2.2
PREPARED FIELD OPERATIONS
a.
During typical operations in and out of prepared airfields and landing sites, the IBF filter
assembly will not require frequent servicing. AFS recommends that the filter maintenance aid
(FMA) be checked about every 25 aircraft operating hours following the first installation and
operation of an IBF system on an aircraft. This should be done to gauge the rate of engine
performance degradation due to changes in engine inlet differential pressure as the filters
accumulate dirt in operations considered “prepared fields” operations. Once an interval of time
in flight hours is determined that provide discrete changes in the FMA, this interval can be
repeated as long as there is no change in the environmental operating conditions.
b.
This interval can be extended after sufficient flight data has been accumulated to establish a
greater interval. Upon seeing increases in MGT and associated decreases in temperature margin
/ available power, the inspection interval should again be shortened to about every 25 hours or
less to enable scheduling of filter servicing without interruption of normal operations.
c.
Ensure all filter servicing requirements defined in Section 7.2.1 are followed. Refer to Section
7.3 for servicing of the filter assembly.
7.2.3
SEVERE ENVIRONMENT OPERATIONS
a.
When operating in an environment of high sand and dust levels, frequent servicing of the filter
assembly may be required based on the time exposure and severity of the environment. Any
operations in an environment that can result in “brownout” conditions should therefore be
minimized or avoided to the maximum extent possible within the constraints of the operation.
During operations for extended periods of time in brownout conditions, monitoring of the FMA
between shut down and start up will allow the maintainer or operator to trend the change in
differential pressure. Once an interval of time in flight hours is determined that provide discrete
changes in the FMA, this interval can be repeated as long as the initial readings remain typical
of the current operations.
b.
Ensure all filter servicing requirements defined in Section 7.2.1 are followed. Refer to Section
7.3 for servicing of the filter assembly.
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