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(d) Push the MENU switch to go back to the SELF TEST? display.
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G. DISCRETE INPUTS
SUBTASK 27-32-00-740-008
(1) Push the down arrow to display DISCRETE INPUTS?
SUBTASK 27-32-00-740-009
(2) Push the YES switch to start the discrete inputs test.
(a) Push the down arrow until ASYMETRY=OPEN is displayed.
(b) Push the ON/OFF switch on the FSEU BITE panel.
(c) Push the down arrow on the FSEU until OTHER FUNCTNS? is displayed.
(d) Push the YES switch on the FSEU.
(e) Push the down arrow on the FSEU until SET OUTPUTS? is displayed.
(f) Push the YES switch on the FSEU.
(g) Push the down arrow on the FSEU until LE INTRANS? is displayed.
(h) Push the YES switch on the FSEU to display SET ON?
(i) Push the YES switch on the FSEU.
(j) Verify that both SMYDs display ASYMETRY=GND.
(k) Push the down arrow on both SMYDs to display LE UCM=OPEN.
(l) Make sure the FSEU display returns to LE INTRANS?
NOTE: It takes approximately 75 seconds from step (i) for this to occur.
(m) Push the down arrow on the FSEU to display LE UCM?
(n) Push the YES switch on the FSEU to display SET ON?
(o) Push the YES switch on the FSEU.
(p) Verify that both SMYDs display LE UCM=GND.
(q) Push the ON/OFF switch on the FSEU.
(r) Push the YES switch on the FSEU to exit its BITE.
(s) Push the MENU switch on both SMYDs until DISCRETE INPUTS? is displayed.
H. ARINC429 TEST
SUBTASK 27-32-00-740-010
(1) Push the down arrow to display ARINC429 INPUTS?
SUBTASK 27-32-00-740-011
(2) Push the YES switch to start the ARINC429 test.
(a) The first input bus will be displayed: ON SIDE IR BUS?
(b) To display the other input busses, push the down arrow until the desired bus is displayed.
(c) A good data bus will display "BUS ACTIVE" and a bad bus will display "BUS INACTIVE".
(d) The busses are:
1) ON SIDE IR BUS
2) OFF SIDE IR BUS
3) ON SIDE ADR BUS
4) CDS DEU BUS
5) FMC BUS
6) DFCS MCP BUS
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7) CROSS CHANNEL
(e) Push YES at any display to activate the test for the bus.
(f) If there is no fault in the bus activity monitor, BUS ACTIVE will be displayed.
(g) If there are faults, BUS INACTIVE will be displayed
NOTE: For some combinations of SMYD and FMC part numbers a nuisance BUS
INACTIVE fault message may occur for the FMC bus. If that occurs, push the up
arrow until EXISTING FAULTS?
(h) Use the MENU key to return to the ARINC429 TEST? display.
I. SENSOR TEST
SUBTASK 27-32-00-740-012
(1) Push the down arrow to display ANALOG INPUTS?
SUBTASK 27-32-00-740-013
(2) Push the YES switch to start the analog inputs test.
(a) The SMYD will display the status of these sensors:
1) AOA SENSOR
2) FLAP SENSOR
3) YD LVDT
4) WHEEL SENSOR
NOTE: The WHEEL SENSOR is only on the SMYD installed in the number 2 position.
The SMYD in position 1 will not have this sensor. If the sensor value is bad,
"WHEEL INVALID" will appear.
(b) To move through the sensors, push the up and down arrow until the desired sensor is
displayed.
(c) When the sensor is displayed, push the YES switch to show the status of that sensor. The
possible displays are:
1) AOA (sensor angle) or AOA INVALID
2) FLAP DET (flap detent position), FLAP SYN (flap synchro angle), or FLAP INVALID
NOTE: Use the down arrow to move from the FLAP DET nn display to the FLAP SYN
nn display.
3) YD LVDT (angle) or YD LVDT INVALID.
4) WHEEL (angle) or WHEEL INVALID.
NOTE: WHEEL and WHEEL INVALID is only on the SMYD installed in the number 2
position.
(d) Push the MENU key to return to the ANALOG INPUTS? display.
J. SERVO TEST
NOTE: The SERVO TEST can be run from SMYD 1 and SMYD 2. Do the steps below for either
SMYD.
SUBTASK 27-32-00-740-014
(1) Push the down arrow switch until SERVO TEST? is displayed.
SUBTASK 27-32-00-740-015
(2) Push the YES switch to start the servo test.
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(a) A series of warning messages will be displayed on the SMYD prior to the activation of
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737-600-700-800-900 AIRCRAFT MAINTENANCE MANUAL飞机维护手册3(101)
