(2)
AIRPLANES WITH BENDIX RTA-44A VHF TRANSCEIVERS;
Leads - coax test, for wattmeter connection
C. References
(1)
AMM 23-51-00/501, Flight Interphone System
(2)
AMM 24-22-00/201, Electrical Power - Control
D. Access
(1) Location Zones
119 Main Equipment Center (Left)
120 Main Equipment Center (Right)
211 Flight compartment, left
212 Flight compartment, right
E. Prepare for the System Test
S 865-002
(1)
Supply electrical power (AMM 24-22-00/201).
(2)
Set the STBY PWR switch, on the pilots' overhead panel P5, to AUTO.
S 865-004
(3)
Make sure the flight interphone system operates (AMM 23-51-00/501).
S 865-003
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F. Self-Test - VHF Communication Transceiver
S 745-074
(1) AIRPLANES WITH COLLINS VHF-700/700A TRANSCEIVERS; At each VHF comm transceiver, (E4 rack) do the steps that follow:
(a)
Push and hold the SQL/LAMP TEST switch.
1) Make sure the red CONTROL INPUT FAIL and the green LRU PASS lights come on and stay on.
(b)
Release the SQL/LAMP TEST switch.
(c)
Push and release the TEST switch.
1) Make sure the LRU PASS light comes on for approximately four seconds, and the display shows less than 3.0.
(d)
Turn and hold the rotary switch in the FWD position.
1) Make sure a value of at least 25 W (Watts) is shown on the display.
(e)
Turn and hold the rotary switch in the RFL position.
1) Make sure the value shown in the display is less than 25 percent of the value shown when the rotary switch is held in the FWD position.
(f)
Release the rotary switch.
S 745-076
(2) AIRPLANES WITH BENDIX RTA-44A VHF TRANSCEIVERS; At each VHF comm transceiver, (E4 rack) do the steps that follow:
(a)
Push and hold the SQ/TEST switch. 1) Make sure the green COMM light, red COMM light, and red DATA IN light come on for approximately three seconds. 2) Make sure the green COMM light, red COMM light, and red DATA IN lights go off. 3) Make sure that after approximately three seconds, the green COMM light comes on and stays on.
4) Make sure the red COMM light and the red DATA IN light stay off.
(b)
Release the SQ/TEST switch.
G. VHF Communications Control Panel Test
S 755-045
(1) At each VHF comm control panel (P8), do the steps that follow:
(a) Set the TFR switch on each panel to the left position.
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757 MAINTENANCE MANUAL
(b)
Make sure the left transfer light (above the frequency display), and the left frequency display are on.
(c)
Adjust the outer PANEL/FLOOD AISLE STAND switch on the left lighting control panel (P5). 1) Make sure the intensity of the lights at each VHF comm
control panel changes.
(d)
Do the VHF Control Panel Test paragraph again with the TFR switch set to the right position.
H. VHF Communications Test
S 715-010
(1) Do the steps that follow to do the VHF communications test:
(a)
Connect the headset/boom mic to the captain's jack panel, on the captain's auxiliary instrument panel, P13.
(b)
Make applicable selections on the captain's audio selector panel (P8): 1) Push the VHF-L MIC SELECTOR switch on the captains ACP. 2) Adjust the VHF-L volume control knob to the 12-o'clock
position. 3) Make sure the BOOM/OXY (or the BOOM/MASK) switch is set to the BOOM position.
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