Aerospace Filtration Systems, Inc.
MD500-IBF-KIT-OMM/IPL
Proprietary
Information
Use or disclosure of this material is subject
MD500 IBF Operation & Maintenance Manual/
to the restrictions on the title page
Illustrated Parts List - Revision B
11
CAUTION
Do not over crimp and crush pleat, care must be
taken to squeeze the pleats without deforming or
damaging the pleated screen.
After servicing of the filters, the pleats may require straightening or crimping. When looking
down on the filter from either side, you must be able to see the bottom of the pleat. If you cannot
see the bottom of the pleat, the airflow will be restricted and/or the pleats will stick together
when dust loaded. Any restriction to the flow through the pleats will result in increased pressure
drop and reduction in sand loading capacity. In order to insure ideal flow characteristics through
the filter media, the pleats must be straightened or crimped with a standard sheet metal tool
(hand seamer). Once one side is crimped, flip the filter over and crimp the other side as required
following the guidance above.
4.2 P
UNCTURE
D
AMAGE
In the event of damage to the filter system, ruptures in the filter can be repaired without risk of
structural deformation of the filter element. Small ruptures defined as smaller than a dime can be
sealed shut without degradation of performance. Larger ruptures exceeding a dime in size
require the assembly to be returned to AFS for evaluation. Details of these repair procedures are
defined below. Prior to performing any of these repairs, the filter material must be cleaned and
void of contamination and oil.
4.2.1 Small
Rupture
Ruptures or voids in the material up to a dime in size can be trimmed clean to remove loose
material (wire or cotton gauze) and encased in a sealing material. The sealing material shall be a
two-part sealant, such as AMS 3276, for standard use on aircraft. Allow the sealant to bleed into
the filter material and cure before operating to ensure it will not dislodge into the engine inlet
plenum.
4.2.2 Large
Rupture
Ruptures in the material exceeding a dime in size are not repairable in the field, and the element
shall be returned to AFS for evaluation and disposition.
4.3 M
AINTENANCE
D
AMAGE
The repair procedures defined above are valid for handling damage resulting in ruptures as
described above. Any unrepairable damage to the filter frames that impair the integrity of the
structural security or sealing surfaces shall require the element to be returned to AFS for
evaluation and disposition.
Summary of Contents for MD500 Series
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