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
14
4.5.4 Repair
The construction details of the component do not warrant field maintenance. There is no repair
for this component, contact AFS to obtain a new component. If the Filter Maintenance Aid fails
the function check, disconnect the hose assembly and inspect for damage or blockage of the tube
assembly. Inspect the opening on the Filter Maintenance Aid for obstructions. Remove
obstructions if present. Reattach hose assembly and perform function check (Refer to Section
4.5.5). If it fails function check, replace FMA. Replace damaged sheet metal components of the
Mount Assembly and missing or damaged hardware if required. Re-apply corrosion protection
to mount as required.
4.5.5 Function Check
CAUTION
IMPROPER USE OF THE ALTIMETER TEST SET COULD RESULT IN DAMAGE TO THE
FILTER MAINTENANCE AID.
CAUTION
IMPROPER USE OF THE ALTIMETER TEST SET SUCH AS PULLING AN ALTITUDE OF
GREATER THAN 1880 FEET ABOVE FIELD ELEVATION WILL DAMAGE THE FILTER
MAINTENANCE AID.
Connect the Barfield (or equivalent) altimeter test set vacuum system to the end of the fitting
inside the plenum area. Ensure that the fit between the test set and fitting is tight, i.e., no leakage.
Reset the Filter Maintenance Aid by depressing the yellow button marked “PUSH TO RESET”
located on the end of the filter maintenance aid (See Picture 2). The maintenance aid should
indicate in the red zone within the following range:
Test Station Elevation (ft)
Test Method
0
2000
4000
6000
8000
10000
Low Pressure Calibrator (inches of H
2
O)
10.5 ± 1.1
Altimeter Test Set (ft above test station elevation)
720 ±70
770 ±80
810 ±80
870 ±90
920 ±90
980 ±100
* Note: See Figure 5 for an alternate function check method.
4.5.6 Installation
Position the Filter Maintenance Aid into the Mount Assembly. Install hardware and connect hose assembly.
Perform Function Check of Filter Maintenance Aid (Refer to Section 4.5.5).
Summary of Contents for MD500 Series
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