BR3000-330-2CL,-3CL,-2EN CMM and IPL
Document No. 33-21-57, Rev. A
Page 39
5.6 BR3000 MLS LRU Testing and Fault Isolation
The BR3000 MLS system fault isolation will be to the LRU level. There are no
component-level repair functions for the BR3000 Line Replaceable Units (LRU’s) that
can be accomplished in the field or at the repair depot level. All malfunctioning LRU’s
must be returned to the manufacturer, Bruce Aerospace, for repair or replacement.
This section describes operational and fault isolation tests that may be executed on the
BR3000 MLS system, on the aircraft should an LRU malfunction be suspected. A
flowchart for the BR3000 MLS LRU-level fault isolation process is provided in Figure 18.
A written description of BR3000 MLS LRU-level fault isolation methods is also provided
in the following paragraphs.
5.6.1 Tools and Equipment, Operational Test and Fault Isolation
Recommended, but not required:
A Digital Multi Meter (DMM) may be helpful to isolate wiring and data cable
issues. It can also be used to verify power distribution to BR3000 MLS system
units.
An inspection mirror may be used to better view the individual LED emitters in an
LCM unit.
5.6.2 Power-Up Procedure
1.
Follow the BR3000 MLS system power up procedures provided in Section 4.1.1.
2. Verify that the MLCP unit (see Figure 3) has initialized with the Day mode
operation LED illuminated and the HIGH Scenario operation LED illuminated.
a. If the MLCP unit fails to initialize properly, attempt an MLCP reset as
described in Section 4.1.3. If the MLCP still fails to initialize properly,
replace the MLCP unit.
3.
After a 3 second delay, the MLS system will initialize with all LCM units in the
system displaying the HIGH Scenario level.
a. If any LCM units are partially illuminated, replace the affected LCM unit.
b. If any LCM units are fully extinguished, check that power is applied to the
affected LCM unit. If power is applied and the LCM unit still fails to
illuminate, replace the affected LCM unit.
To Next Page
Loading...