ADF SYSTEM -DISPLAYS
General
ADF pointers show in all EFIS modes but PLN (plan). The pointers are cyan in color. To display the ADF pointers, set the ND mode selector to APP, VOR, or MAP. Set the VOR/ADF switch on the EFIS control panel to the ADF position.
The ADF pointers move around the compass scale. The wide pointer shows the bearing from the right ADF receiver, and the thin pointer shows the bearing from the left ADF receiver.
The ADF source annunciation and frequency or identifier show in cyan at the lower corners of the NDs. The station identifier replaces the frequency when the data is valid from the ADF receiver.
NOTE: The graphic shows the displays for the VOR mode, the
displays are the same for the other ND modes except
PLN.
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ADF SYSTEM -ND NCD AND INVALID DISPLAYS
General
When the receiver output is no computed data (NCD), the ADF pointers go out of view. The source annunciation and frequency remain in view.
When the receiver output is invalid, all ADF data goes out of view and the amber ADF flags show.
When you move the VOR/ADF switch on the EFIS control panel from the ADF position, these displays go out of view:
*
ADF flags
*
Source annunciation
*
Frequency
*
ADF pointers.
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ADF SYSTEM -TEST DISPLAYS
Test
Use the maintenance access terminal (MAT) to do a test of the ADF receivers. To see the test displays, select APP, VOR, or MAP on the ND mode selector of the EFIS control panel. Set the VOR/ADF switch to ADF.
When you select test on the MAT, the receiver starts a test sequence. The test displays show on the ND.
From one to three seconds, these invalid displays show on the ND:
*
Remove the ADF source annunciation
*
Remove ADF frequency
*
Remove ADF pointers
*
Show the amber ADF flag.
From three to six seconds, these NCD displays show on the ND:
*
Show source annunciation
*
Show frequency.
*
Remove ADF pointers
*
Remove the amber flag.
From six seconds to the end of test, the ND shows the test display with the ADF pointer at 135 degrees in relation to the face of the ND until the end of test.
NOTE: The graphic shows a test of the left ADF receiver. The test is the same for the right ADF system.
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ADF SYSTEM -SELF TEST
General
The TEST switch on the front panel of the ADF receiver starts a test of the ADF system. During the test, the receiver BITE circuits:
*
Do a test for normal operation
*
Do a check of the control input data status.
Operation
After you push the TEST switch, all of the light emitting diodes (LEDs) come on for three seconds. Then all LEDs go off for the next three seconds. If you push the TEST switch for longer than 9 seconds, the test results show until you release the switch. A 1020 Hz tone comes on in the flight deck during the ninth second of the test.
Training Information Point
The maintenance manual and the fault isolation manual do not have a task for the line maintenance technician to do a test from the front panel of the ADF receiver. You must do all tests for the ADF receiver from the MAT or a PMAT.
Many LRUs on the 777 are compatible with other model airplanes that do not have a central maintenance computing system (CMCS). For that reason these LRUs have a front panel test feature.
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ADF SYSTEM -GROUND TEST
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