(f)
Push the PTT switch on the captain's or first officer's control wheel.
(g)
Make sure the BIT (DISCRETE) 1 shows a 0.
(h)
Release the PTT switch.
(i)
On the audio selector panel, put the switch to the R VHF position.
(j)
Push the PTT switch on the control wheel.
(k)
Make sure the BIT (DISCRETE) 2 shows a 0.
(l)
Release the PTT switch.
(m)
On the tester, set the SUBFRAME to 0 and the WORD to 5.
(n)
Make sure the BIT (DISCRETE) 1 shows a 1
(o)
On the audio selector panel, put the switch to the C VHF position.
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(p)
Push PTT switch on the captain's or first officer's control wheel.
(q)
Make sure the BIT (DISCRETE) 1 shows a 0.
S 865-878-001
(2) Release the PTT switch.
U. HF Test
S 735-640-001
(1) Do the HF test that follows:
(a)
Make sure the HF communication systems are operational (Ref 23-11-00).
(b)
Tune the left and right HF transceiver to an approved test frequency.
(c)
On the tester, set the SUBFRAME to 0 and the WORD to 6.
(d)
Make sure the BIT (DISCRETE) 1 and 2 shows a 1.
(e)
On the audio selector panel, put the switch to the L HF position.
(f)
Push the PTT switch on the captain's or the first officer's control wheel.
(g)
Make sure the BIT (DISCRETE) 1 shows a 0.
(h)
Release the PTT switch.
(i)
On the audio selector panel, set the switch to the R HF position.
(j)
Push the PTT switch on the control wheel.
(k)
Make sure the BIT (DISCRETE) 2 shows a 0.
S 865-879-001
(2) Release the PTT switch.
V. AIR/GROUND Discrete Signal Test
S 735-650-001
(1) Do the air/ground test that follows:
(a) On the tester, set the SUBFRAME to 0.
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WARNING: DO THE DEACTIVATION PROCEDURE FOR FLIGHT MODE SIMULATION
_______ BEFORE YOU OPEN THE AIR /GROUND CIRCUIT BREAKER. WHEN YOU OPEN THE AIR/GROUND CIRCUIT BREAKER THE AIRPLANE IS IN FLIGHT MODE. IN FLIGHT MODE, MANY OF THE AIRPLANE SYSTEMS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
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本文链接地址：757 AMM 飞机维护手册 仪表 CHAPTER 31 - INSTRUMENTS 1(73)
