Aerospace Filtration Systems, Inc.
MD500-IBF-KIT-OMM/IPL
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MD500 IBF Operation & Maintenance Manual/
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Illustrated Parts List - Revision B
1
AFS MD500 Inlet Barrier Filter (IBF) System
Operation & Maintenance Manual
1.0 OPERATIONAL REQUIREMENTS
1.1 S
YSTEM
D
ESCRIPTION
The Aerospace Filtration Systems (AFS) IBF system design includes an all-new aircraft upper
aft engine inlet fairing assembly. For the purpose of this manual, this component will be referred
to as the “aft fairing.” The aft fairing conforms to the inlet duct and upper section of the engine
inlet plenum chamber. The IBF system (Figure 1) is an integral aircraft component with
subsystem components incorporated into the aft fairing. It is comprised of an aerodynamic
structural fairing, integral structural frame and deflector, integral bypass system, two barrier
filter assemblies (forward and upper), integral seals, plumbing for the existing differential
pressure switch, two forward floor plates and a control rod fairing that interfaces with the
existing flexible boot and tail rotor control rod to seal the inlet plenum.
The forward and upper barrier filter assemblies are comprised of the filtration media and
mounting frames with captive fasteners. The current interface with the MDHI forward split
fairings is maintained, and the tail rotor control rod interface is improved over its current
configuration.
The IBF fairing employs a mechanically operated inlet bypass system to permit unfiltered air to
enter the engine inlet plenum chamber should the IBF filter media become obstructed. Once the
bypass system is rigged during the IBF system installation, no recurring maintenance is required.
A standard MDHI MD500 aircraft inlet differential pressure sensor is used and for most
installations the existing sensor can be reused. The sensor provides an indication to the pilot of
debris accumulation on the filter elements, glossing over due to ice or snow, and when to activate
the bypass system prior to the pressure drop across the filters exceeding operational limits.
On the ground, an optional Filter Maintenance Aid (FMA), may be mounted in the compartment
aft of the left hand passenger seat, the FMA displays the maximum differential pressure across
the filter reached during the last flight. It is accessible only on the ground, providing the
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 & 2).
The Filter Maintenance Aid is designed to hold the highest differential pressure across the filter
assembly reached during the last flight, and should be reset after servicing of the filter assembly.
Summary of Contents for MD500 Series
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