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ALL ú ú 11A Page 8 ú Feb 18/00
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MAINTENANCE MANUAL
10) Mode 19 - Erase fault memory. This mode erases the contents of the WBC fault memory. The fault memory is located in the WBC.
11) Mode 20 - Do not use. Show calibration scale weights.
12) Mode 21 - Show transducer zero data. The WBC shows the zero data for the landing gear transducers connected to it.
13) Mode 22 - Show transducer measurement. This mode shows the counts generated by each landing gear transducer. Each landing gear transducer provides an analog voltage to the WBC. This analog voltage represents the weight measured by that landing gear transducer. The analog voltage is digitized in an analog-to-digital (A/D) converter. The output of the A/D is in digital counts. The counts represent the weight measured by the landing gear transducer. These counts are shown on the display. The WBC shows the counts for the landing gear transducers connected to it.
14) Mode 23 - Show load sensor resistance values.
15) Mode 24 - Show transducer span data. The WBC shows the span values for the landing gear transducers connected to it.
16) Mode 25 - Show transducer offset data. The WBC shows the offset values for the landing gear transducers connected to it.
17) Mode 26 - Show transducer calibration resistance. The WBC measures the resistance of the landing gear transducers and the connections to those transducers. It is those values that are shown.
18) Mode 27 - Show PAS offset. The WBC shows the offset for the pitch attitude sensor.
19) Mode 28 - Show PAS measurement. This mode shows the counts and resistance for the pitch attitude sensor. The PAS provides an analog voltage to the WBC. This analog voltage represents the airplane attitude measured by the PAS. The analog voltage is digitized by an A/D converter. The output of the A/D is in digital counts. The counts represent the airplane attitude measured by the landing gear transducer. These counts and resistance are shown on the display.
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31-41-00
ALL ú ú 10A Page 9 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
20) Mode 29 - Show reference network calibration coefficients.
21) Mode 31 - Do not use. Enter/verify airplane type and identification code. In this mode, the values for airplane type and identification code are stored in the calibration module and the WBC. Use the keyboard on the WBC to enter the airplane type and identification code into the WBC and CM.
After the airplane type and identification code are entered, the WBC asks whether the existing calibration data stored in the calibration module is to be erased. Erasure of the stored data should be done if a new CM is being installed. This would prevent use of wrong calibration data. Installation of a new WBC does not require erasure of the calibration data. Since the CM was not removed, the WBC would receive the correct calibration data from the CM.
22) Mode 32 - Enter/verify attitude measurements. This mode is used to enter the initial pitch attitude measurement. This value is required by the WBC to calibrate the readings from the pitch attitude sensor. This mode is normally used when installing a PAS. The pitch attitude entered must not be more than +/- 5 degrees. If it is, the display will show INVALID ATTITUDE.
23) Mode 33 - Enter/verify tip alarm limit. This mode is used to enter the tip alarm limit. The CG entry threshold is 35% to 41%, inclusive, which determines when the tip alarm will be triggered.
24) Mode 34 - Initiate acquisition of transducer zero data for all transducers. The WBC requires the zero data in order to determine the output of each landing gear transducer with no weight on the landing gear. This mode causes the WBC to read the landing gear transducer measurements. It should only be used when the landing gear transducers read zero weight (that is, when the airplane is on jacks).
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