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contains relays and time-delay relays for engaging the system. A signal
from the energized relays activates the yaw damper actuator. Other
signals inform the yaw damper coupler that the system is engaged and
turn off the yaw damper warning annunciator on the overhead panel. The
yaw damper coupler contains BITE circuitry for troubleshooting and
system verification. Switches and indicators on the front of the unit
operate the BITE system. During yaw damper BITE, the autopilot light
on the autoflight status annunciator (ASA) illuminates red. Some BITE
tests move the rudder and check the complete system. Other tests check
the internal operation of the coupler.
[4] The yaw damper coupler is a 3/8 ATR rack assembly containing solid
state subassemblies for yaw computation, BITE, and rate sensing, the
coupler weighs approximately 10.2 pounds (4.5kg). The coupler detects
yaw oscillations (dutch roll) and generates rudder commands to cancel
the oscillation. Because the yaw damper coupler contains static-sensitive
circuitry and an internal rate gyro, certain handling precautions are
necessary. Be careful not to touch the connector pins on the back when
removing and installing the coupler. Wait 3 minutes after removing
power from the coupler when removing the yaw damper coupler from the
airplane. This allows the gyro to “spin down”, avoiding damage.
[5] The yaw damper engage switch and yaw damper warning annunciator
are located on the flight control module on the forward overhead panel
(P5)
Fig. 34-3 flight control module components
The yaw damper engage switch is used to engage the yaw damper
system .The yaw damper warning annunciator indicates yaw damper
system disengagement. The light is on when the system is disengaged.
The yaw damper engage switch is a two position ,solenoid-held switch.
The solenoid is controlled by the yaw damper engage logic. The solenoid
holds the switch in the ON position. Place the yaw damper engage switch
ON to engage the yaw damper. A switch in the IFSAU (integrated flight
system accessory unit ) closes. This switch provides a ground to the
holding coil of the engage switch. After a delay, a relay in the IFSAU
energizes. This relay turns off the yaw damper warning annunciator and
engages the system .
[6] Each component of the yaw damper system serves a function in the
proper operation of the system. The yaw damper coupler and the rudder
power control unit combine to move the rudder to correct dutch roll. The
flight control module and the IFSAU combine to engage the system. The
maintenance manual contains procedures for isolating troubles to the
faulty LRU.
[7] If there is a reported problem, the minimum equipment list gives
guidance on how to dispatch the airplane. Use the trouble shooting charts
in MM (maintenance manual) chapter 22-12 to isolate the problem. The
charts list common system troubles grouped as engage troubles and
operation troubles. Find the trouble in the charts and then follow the
isolation procedure. As required by the MM procedure,use yaw damper
BITE to verify system operation. Yaw damper BITE exercises the
complete system including moving the rudder to verify the system
operation.
Fig. 34-4 troubleshooting charts
READING MATERIAL
QUESTIONS TO LESSON 34 READING MATERIAL
1. Whom does yaw damper 28v provide for?
2. What powers the yaw damper coupler?
3. Whom do the hydaulic system B provide hydraulic pressure for ?
4. To engage the yaw damper system, what switch is first on ?
5. When do the actuator engage solenoid turn on and the yaw damper
warning annunciator turn off ?
6. Who can move the rudder a maximum of 3 degrees either side of the
trimmed position ?
7. What do the rate gyro sense?
8. What is the functions of yaw damper coupler ?
9. what is the functions of the transfer valve ?
10. What is the use of feedback signal from the position transducer?
11. What condition can disengage the yaw damper?
12. What are the engage interlocks ?
13. When the yaw damper disengage, what annuncitor comes on ?
EXERCISE
A. Find out the explanations of the follwing words in your
“English-chinese technical dictionary”
1. dutch roll [ P1-49]
2. damper [ P1-39 ]
3. yaw axis [ P1-172 ]
4. yaw damper [ P1-172 ]
5. yaw rate [ P1-172 ]
6. laser gyro [ P1-90 ]
7. actuator [ P1-2 ]
8. time delay [ P1-156 ]
9. solid state switch [ P1-139 ]
10. minimum equipment list [ P1-101 ]
11. dispatch deviation [ P1-45 ]
B. Translate the 1st and 2nd paragraphs of lesson 34 into chinese
C. Explain the following abbreviations
1. ASA
　
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