PRIMARY DISPLAY SYSTEM -SECONDARY ENGINE EXCEEDANCE
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PRIMARY DISPLAY SYSTEM -SPECIAL FUNCTIONS
General
The AIMS primary display system (PDS) special functions make sure the interfaces of the displays to their hardware are correct. PDS hardware includes:
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CPM/GGs
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Display units (DU)
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Coaxial couplers
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Control panels and switches
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Remote light sensors
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Cursor control devices (CCD).
These are the special functions for PDS hardware:
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Display Switches
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Display screens (5)
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CPM/GG to WXR interface checks (4)
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Brightness control and display units
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CPM/GG to DU interface checks (4).
Display Switches
The display unit special functions supports functional testing of interfaces and verifies correct operation. The DUs show a test format to do this.
Display Screens (5)
Select the display screen special functions on the MAT. Examine the DU liquid crystal display (LCD). The DU BITE circuits do not monitor the DU LCD and electronic driver circuits. These are the failures to look for:
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Line defects
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Element defects
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Full-field gray scale characteristics.
For the full red screen test (the red, blue, and green screen tests are similar), all six DUs show a solid red screen. Use the MAT to cycle through the seven red gray scales. All six DUs show the same red gray scale level. This occurs with the brightness controls on all six DUs set to maximum and all six DUs should appear equal. A DU with a weak backlight or electronic driver failure stands out from the other DUs at one or more of the gray scale levels.
For the full white/black screen test, all DUs show a solid white screen. Use the MAT to cycle through the seven gray scales plus black. This test detects intermittent dot failures and hard failures. A DU with a weak backlight or electronic driver failure stands out from the other DUs at one or more of the gray scale levels.
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PRIMARY DISPLAY SYSTEM -SPECIAL FUNCTIONS
For the striped pattern test, all six DUs show a screen with diagonal white and black stripes. This format allows detection of electrically floating line failures. These lines may not be visible on a solid color screen.
CPM/GG to WXR Interface Check (4)
The CPM/GG to WXR interface check verifies the validity to the WXR ARINC 453 inputs to the GGs in each AIMS cabinet.
Brightness Control and Display Units
This special function supports functional tests of hardware interfaces and makes sure operation is correct. The six DUs show a test display to do this.
CPM/GG to DU Interface Checks (4)
The graphic generator special functions supports functional tests of airplane interfaces and verifies correct interface of the CPM/GGs to the DUs. The CPM/GGs do a test one at a time. The DUs are grouped in two sets of three for this test. All four combinations of CPM/GG to DU groups are tested. The DUs show the test format to make sure that each DU receives each CPM/GG input.
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PRIMARY DISPLAY SYSTEM -BRIGHTNESS CONTROLS AND DISPLAY UNITS TEST DISPLAY
General
The brightness controls and display units test is a special purpose test that does a test of the primary display system hardware. You use the MAT or PMAT to start the test and the test display shows on all six DUs.
The test display shows these:
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DU location
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