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(a) Push the ON/OFF switch on the SMYD BITE display to turn the BITE display on.
NOTE: EXISTING FAULTS? will be displayed.
(b) Push the down arrow until the display shows FAULT HISTORY?.
1) Push the YES switch.
a) If there are faults in history, The display will show FLIGHT LEG -n where n is the
most recent flight with faults recorded.
b) If there are no faults, the message NO FAULT HISTORY will be displayed.
2) Push the up arrow or down arrow to go through the flight legs.
3) If you push YES at any flight leg display the message corresponding to the first fault in
the list will be displayed.
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4) To display the faults for the flight leg use the up arrow and down arrow.
NOTE: To return to the FLIGHT LEG N display, push the MENU switch.
5) To return to the FAULT HISTORY display, push the MENU switch.
6) Refer to FIM 27-32 TASK 801 to find the fault isolation task for the applicable
maintenance message.
G. If you are finished with the SMYD tests, return the airplane to normal.
SUBTASK 27-32-00-860-007
(1) Push the ON/OFF switch to turn the SMYD display off.
SUBTASK 27-32-00-410-002
(2) Close this access panel:
Number Name/Location
117A Electronic Equipment Access Door
SUBTASK 27-32-00-860-008
(3) If electrical power is no longer necessary, do this task: Remove External Power,
TASK 24-22-00-860-814.
------------------------- END OF TASK ---------------------------
TASK 27-32-00-740-803
5. Stall Management Yaw Damper (SMYD) BITE Test - Ground Test
(Figure 502)
A. General
(1) This procedure does the GROUND TEST? portion of the Stall Management Yaw Damper (SMYD)
BITE.
(2) For GROUND TEST, the SMYD has several menus:
(a) SELF TEST? - This performs a self test sequence of the SMYD.
(b) DISCRETE INPUTS? - Monitors the status of each displayed discrete inputs to the SMYD.
(c) ARINC429 INPUTS? - Monitors the status of each ARINC429 input to the SMYD.
(d) ANALOG INPUTS? - Displays the status of these sensors:
1) AOA SENSOR?
2) FLAP SENSOR?
3) WHEEL SENSOR?
4) YD LVDT?
NOTE: This is only for the SMYD in the number 2 position.
(e) SERVO TEST? - Tests the integrity of the interface between the SMYD and the rudder
power control unit.
(f) DISPLAY TEST? Tests the SMYD display.
(3) This task has a procedure for each of these menu items.
B. References
Reference Title
24-22-00-860-813 Supply External Power (P/B 201)
24-22-00-860-814 Remove External Power (P/B 201)
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(Continued)
Reference Title
34-21-00-820-801 Air Data Inertial Reference System - Alignment from the FMC CDU
(P/B 201)
34-21-00-820-802 Air Data Inertial Reference System - Alignment from the ISDU
(P/B 201)
FIM 27-32 TASK 801 Stall Management Yaw Damper BITE Procedure
C. Location Zones
Zone Area
118 Electrical and Electronics Compartment - Right
D. Access Panels
Number Name/Location
117A Electronic Equipment Access Door
E. Prepare for the Tests
SUBTASK 27-32-00-860-009
(1) Supply electrical power to the airplane. To do this, do this task: Supply External Power,
TASK 24-22-00-860-813.
SUBTASK 27-32-00-860-012
(2) Align the air data inertial reference system. To do this, do this task: Air Data Inertial Reference
System - Alignment from the ISDU, TASK 34-21-00-820-802 or Air Data Inertial Reference
System - Alignment from the FMC CDU, TASK 34-21-00-820-801.
SUBTASK 27-32-00-010-003
(3) Open this access panel:
Number Name/Location
117A Electronic Equipment Access Door
NOTE: Do the steps that follow on both SMYD #1 and SMYD #2.
F. SELF TEST
SUBTASK 27-32-00-740-003
(1) Push the ON/OFF switch to turn on the BITE display.
SUBTASK 27-32-00-740-004
(2) Push the down arrow to display GROUND TESTS?
SUBTASK 27-32-00-740-005
(3) Push the YES switch. SELF TEST? will be displayed.
SUBTASK 27-32-00-740-007
(4) Push the YES switch to start the self test.
(a) TEST IN PROGRESS will display while the test is run.
(b) When the self test is complete either:
1) A message corresponding to the first fault will be displayed.
2) Or SMYD LRU OK will be displayed.
(c) If faults are detected, then, do this task: FIM 27-32 TASK 801.
　
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