(b)
Turn the <>POSITION control until the line-cursor is on the failure condition.
(c)
Read the reflection coefficient directly off the LCD above the VERT SCALE control. 1) A good waveform with no failure conditions (flat) will have
a reflection coefficient of zero. 2) Small impedance changes from 10mp to 100mp can possibly be a cable connector and are usually not important.
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3) Large impedance changes of +/- 1000mp show an open or a short circuit in the applicable cable.
NOTE: A positive value shows an increase in impedance and
____ will be a hill on the waveform. A negative value shows a decrease in impedance and will be a valley on the waveform.
(d) The TDR can also calculate and show the impedance, in ohms, at the cursor position on the applicable cable. 1) This function is available from the SETUP MENU. 2) The value will show under the 'distance to cursor' value on
the LCD. 3) Most 50 ohm coaxial cable is manufactured to an impedance of 50+/-2 ohms.
F. Put the Cable Back to its usual Condition
S 082-018
(1)
Disconnect the TDR adapter cable from the breakout box.
S 092-014
(2)
Remove the breakout box.
S 082-015
(3)
Remove the 50 ohm terminator (or jumper) from the other end of the applicable cable.
(4)
Install the applicable black box (AMM 20-10-07/201).
(5)
Connect the applicable cable at the two ends.
S 412-016
S 432-017
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CONTROL CABLES - REMOVAL/INSTALLATION
_____________________________________
1. General_______
A. This procedure contains two tasks. The first task is the removal of control cables. The second task is the installation of control cables.
B. This procedure includes instructions for prefabricated and not prefabricated cables to make installation easier when portable swaging machines are available.
C. If this procedure does not agree with specified maintenance procedures, use the specified maintenance procedure.
D. The maintenance manual location for control cable fabrication data is found in Table I.
~........................................................... | TABLE I | ............................................................. | CABLE | AMM LOCATION | ............................................................. | | | | FLIGHT CONTROLS | | | - AILERON & AILERON TRIM | AMM 27-09-14/201 | | - SPOILER | AMM 27-09-14/201 | | - SPEED BRAKE | AMM 27-09-14/201 | | - RUDDER | AMM 27-09-14/201 | | - STAB TRIM | AMM 27-09-14/201 | | - ELEVATOR | AMM 27-09-14/201 | | - TRAILING EDGE FLAPS | AMM 27-09-14/201 | | | | | LANDING GEAR | | | - BRAKES | AMM 32-41-81/401 | | - EXTENSION/RETRACTION | AMM 32-31-41/401 | | - NOSE WHEEL STEERING | AMM 32-51-31/401 | | - MANUAL EXTENSION MLG | AMM 32-34-31/401 | | - MANUAL EXTENSION NLG | AMM 32-35-21/401 | 2........................................…..................1
TASK 20-10-91-004-001
2. Control Cables - Removal (Fig. 401)________________________
A. Equipment
(1) Cable Clamps - A20005-9
B. Consumable Materials
(1) G00270 Tape - Masking
C. References
(1)
AMM 20-10-04/401, Control Cable Air Seal
(2)
AMM 20-10-10/401, Clips - Turnbuckle Locking
(3)
AMM 20-10-09/401, Control Cable Pulleys
(4)
AMM 20-10-08/401, Control Cable Quick Stops
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