(14)
Install the medallion in the center of the control wheel.
S 424-039
(15)
Install the switch assembly in the mounting recess with the two mounting screws.
S 414-038
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757 MAINTENANCE MANUAL
F. Do a Test of the PTT Switch
S 864-040
(1)
Supply electrical power (AMM 24-22-00/201).
S 864-042
(2)
For the Captain's PTT switch, remove the DO-NOT-CLOSE tags and close these circuit breakers on the P11 panel:
(a)
11C25, INTERPHONE CAPT FLT AMPL
or
11C25, INTERPHONE FLT AMPL ASP 1 DUAL PWR
(b)
11G29, INTERPHONE CAPT FLT AMPL
or
11G29, INTERPHONE FLT AMPL ASP 1 R PWR
S 864-044
(3) For the F/O PTT switch, remove the DO-NOT-CLOSE tags and close these circuit breakers on the P11 panel:
(a)
11C26, INTERPHONE F/O OBS
or
11C26, INTERPHONE FLT AMPL ASP 2 DUAL PWR
(b)
11G30, INTERPHONE F/O OBS
or
11G30, INTERPHONE FLT AMPL ASP 2 R PWR
S 714-047
(4)
Do a test of the PTT switch as follows:
(a)
At the applicable pilot's audio selector panel, push a microphone selector switch (but not the INT MIC SELECTOR switch).
(b)
Set the applicable volume control to the necessary level.
(c)
Set and hold the PTT switch on the control wheel in the INT position.
(d)
Make sure you can hear and speak from the interphone.
(e)
At the applicable pilot's audio selector panel, push the INT MIC SELECTOR switch.
(f)
Set the volume control to the necessary level.
(g)
Set and hold the PTT switch on the control wheel in the MIC position.
(h)
Make sure you can hear and speak from the interphone.
(i)
Make sure that the PTT switch goes back to the off position when you release it.
(5)
Remove electrical power if it is not necessary (AMM 24-22-00/201).
S 864-048
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757 MAINTENANCE MANUAL
STATIC DISCHARGING - DESCRIPTION AND OPERATION
______________________________________________
1. General_______
A. Static dischargers are installed along the outboard trailing edges and tips of the wings, the horizontal and vertical stabilizers.
B. Static dischargers reduce radio receiver interference. This interference is caused by corona discharge from airplane surfaces due to precipitation static and engine charging. The static dischargers prevent coupling of static into radio receiver antennas by releasing static at points that are a critical length from airplane extremities. At these points, there is little coupling of static into radio receiver antennas.
2. Component Details (Fig. 1)_________________
A. The static dischargers installed along the trailing edges of the wing and tail surfaces are 9-5/16 inches long. Each includes a resistive discharger rod with a carbon-based molded tip. A setscrew in the discharger holds it to the discharger base. Wing tip and stabilizer tip discharger rods are similarly constructed, but are only five inches long.
B. Aluminum discharger bases are used on sheet metal or Thorstrand aluminized fiberglass surfaces. Titanium discharger bases are used on graphite composite surfaces. Composite trailing edge surfaces within 18 inches of tip areas are covered with Thorstrand aluminized fiberglass. These areas use aluminum discharger bases. A mounting adapter is installed between the discharger base and the composite trailing edge where it is too thin to be adequately riveted. The discharger base is riveted to the adapter. Fasteners for the adapter are two screws forward in the thicker area and two rivets at the trailing edge.
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