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 (f)
Diagnostic code can be decoded as follows: ~................................................................. | DATA SOURCE | | -----------| | FCC=1 | | | FMC=2 | | | TMC=3 | INTERMITTENT BIT SET OR A SENSOR 1=YES | | --------------------| | | | FAULT (SSFDS) OCCURRED 0=NO | | | | DURING AUTOLAND AFTER APP | | | | SELECTED | | | | | | X X X X X X | | -----| | | | | | | DECIMAL CODE ASSIGNMENT (FIM 22-41-00 FAULT | | -----------------------| | | ISOLATION PROCEDURES)| | | CHANNEL | | ---------| | L=1 | | R=2 | | C=3 | | | | FLIGHT FAULT DIAGNOSTIC DISPLAY FORMAT | | | 2.................................................................1

 (g)  
After a successful self-test, pressing the GRD TEST switch causes self-tests to be run on all six computers (3 FCC, 2 FMC, 1 TMC) and interface check data to be collected from all valid computers. This data is stored in the MCDP for use in the ground tests. While the self-tests are being run, an IN PROGRESS message is displayed. After the self-tests are completed, the MCDP displays the first test, 01 FCC. If the test number displayed is the test desired, pressing the YES/ADV switch engages the test. If the test number displayed is not the desired test, pressing the ground test select UP switch or the NO/SKIP switch causes the test number to increase in a sequential loop. Pressing the ground test select DOWN switch causes the test number to decrease in a sequential loop. The MCDP front panel contains a list of available tests.

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Engaging the selected test causes the MCDP CPU to set the ground discrete line. This signals the selected computer(s) (FCCs and/or TMC) that a ground test is to be run. The selected computer checks that its servos are engaged, an in-flight flag indicates an on-ground condition, and it has no faults stored as in-flight fault data. The computers send the CPU their status and set the test required wrap-around bit if the IN-AIR bit, servos engaged, and GRD fault bits are set. The set wrap-around bit indicates to the CPU that the selected computer is ready for the ground test. The CPU then sends the selected computer the test routine number and the necessary parameters for the test. It completes the test routine and sends the results to the CPU. If there are no faults, the CPU sends the next test routine number and parameters. During the test routine, the MCDP displays XX IN PROGRESS when operator interaction is not required (XX denotes the test number being performed). If operator interaction is required, the MCDP displays the appropriate message.The test routine stops, and a fault message is displayed when a fault condition occurs. A fault during an operator response is indicated by the MCDP not advancing to the next step. Pressing the YES/ADV switch causes the CPU to continue the test. A XX TEST COMPLETE message is displayed when the test routine is completed. Pressing the YES/ADV or NO/SKIP switch causes the CPU to exit the test routine. Pressing the FLT FAULT switch interrupts the test routine that is in progress, and puts the MCDP into the in-flight mode. However, all information related to the interrupted test is lost.Diagnostic codes for ground tests are available for Test 30, CURRENT FAULT REPORT. If GROUND TEST 30 CURRENT FAULT REPORT is run, pressing GRD TEST MODE switch/light displays indicated faults diagnostic code. Alternately pressing YES/ADV switch and GRD TEST MODE switch/light displays each current fault and diagnostic code. Repeated pressing of the GRD TEST MODE switch/light also causes the current faults and diagnostic codes to be alternately displayed. The YES/ADV switch must be pressed to display the next fault, if an interface or group fault is displayed. Interface and group faults do not have diagnostic codes.
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