(a)
Disconnect the electrical connector from the position
transmitter.
(b)
Connect the cable assemblies to the airplane electrical connector, the position transmitter, and the breakout box, as shown (Fig. 502).
(c)
Connect the digital voltmeters (DVM 1 and DVM 2) to the appropriate pins on the breakout box.
NOTE: If only one DVM is used, connect it at the DVM 2
____ position first to monitor airplane power. After the airplane power has become stable, move the DVM to the DVM 1 position and monitor the position transmitter output.
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(d)
(e)
(f)
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757 MAINTENANCE MANUAL
Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P11 panel: 1) 11J14, AILERON POS LEFT 2) 11J22 or 11J23, AILERON POS RIGHTMake sure that the airplane input voltage is between 24 and 30 volts ac RMS at DVM 2.
NOTE: After the airplane voltage has become stable, the
____ DVM can be moved to the DVM1 position to monitor transmitter output.
Make sure that the output voltage as shown on DVM 1 is
0 | 0.050 volts ac RMS. If the voltage shown on DVM 1 is not
correct, do the adjustment that follows:
1) If large adjustments are necessary, adjust as follows:
a) Loosen the screws that hold the transmitter in its bracket.
b) Turn the transmitter in its bracket until the output voltage shown on DVM 1 is very near the specified voltage.
c) Tighten the screws that hold the transmitter in its bracket. 2) If fine adjustments are necessary, adjust as follows: a) Cut the lockwire at the fine adjustment nut on the transmitter control rod. b) Turn the fine adjustment nut until the specified voltage is shown on DVM 1.
3) GUN 003-999; Make sure that the length of the control rod is not more than 8.52 | 0.10 inches (216.4 +/- 2.5 mm).
NOTE: If the control rod length and the transmitter
____ voltage are not correct at the same time, turn the transmitter body. If the transmitter is turned in its bracket, tighten the screws and apply the tamper proof putty.
4) GUN 001, 002; Make sure that the length of the control rod is not more than 9.22 | 0.10 inches (234.2 +/- 2.5 mm).
NOTE: If the control rod length and the transmitter
____ voltage are not correct at the same time, turn the transmiter body. If the transmitter is turned in its bracket, tighten the screws and apply the tamper proof putty.
5) Install lockwire to hold the fine adjustment nut in
position. 6) Make sure that the specified voltage is shown on DVM 1.Disconnect the DVMs and cable assemblies from the breakout box.
(g)
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A
757
MAINTENANCE MANUAL
(h)
Disconnect the cable assemblies from the aileron position transmitter and the airplane electrical connector.
(i)
Connect the airplane electrical connector to the position transmitter.
(j)
Do the aileron position-indicating system operational test.
S 825-058
(6)
Adjust The Aileron Position Transmitter (PROCEDURE 4):
(a)
Make a communications connection between a person in the control cabin and a person at the wing. Have the person in the control cabin monitor the aileron position-indicator (on the EICAS status display) while the wing person adjusts the transmitter.
(b)
Make sure that the airplane electrical connector is connected to the aileron position transmitter.
(c)
Make sure that these circuit breakers on the P11 panel are closed: 1) EICAS (6 locations) 2) 11J14, AILERON POS LEFT 3) 11J22 or 11J23, AILERON POS RIGHT
(d)
Push the STATUS button on the pilot's select-display panel, P9, to show the aileron position-indicator on the bottom EICAS display.
(e)
Make sure that the aileron trim indicator (located on the top of the aileron control wheel) is at zero.
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