(b)
Tune the VHF transceivers to an approved test frequency.
NOTE: Key only one transceiver at a time.
____
(c)
On the tester, set the SUBFRAME to 0 and the WORD to 12.
(d)
On the audio selector panel, put the switch to the L VHF position.
(e)
Push the PTT switch on the captain's or first officer's control wheel.
(f)
Make sure the BIT (DISCRETE) 1 shows a 0.
(g)
Release the PTT switch.
(h)
Set the WORD to 6.
(i)
Make sure that BIT (DISCRETE) 1 shows a 1.
(j)
On the audio selector panel, put the switch to the R VHF position.
(k)
Push the PTT switch on the control wheel.
(l)
Make sure the BIT (DISCRETE) 1 shows a 0.
S 865-676-002
(2) Release the PTT switch.
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757 MAINTENANCE MANUAL
AC. HF Test
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(1) Do the HF test that follows:
(a)
Make sure the HF communication systems are operational (Ref 23-11-00).
(b)
Tune the left HF transceiver to an approved test frequency.
(c)
On the tester, set the SUBFRAME to 0 and the WORD to 9.
(d)
Make sure the BIT (DISCRETE) 1 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 tester, set the SUBFRAME to 0 and the WORD to 14.
(j)
Make sure the BIT (DISCRETE) 2 shows a 1.
(k)
Tune the right HF transciever to an approved test frequency.
(l)
On the audio selector panel, set the switch to the R HF position.
(m)
Push the PTT switch on the control wheel.
(n)
Make sure the BIT (DISCRETE) 2 shows a 0.
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(2) Release the PTT switch. AD. Ground Proximity Warning System (GPWS) Test
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(1) Do the GPWS test that follows:
(a)
Make sure the ground proximity warning system is operational (AMM 34-46-00/501).
(b)
On the tester, set the SUBFRAME to 0 and the WORD to 24.
(c)
Make sure the BIT (DISCRETE) 8 shows a 0.
(d)
Set the test switch on the miscellaneous test panel to the GND PROX position.
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本文链接地址：757 AMM 飞机维护手册 仪表 CHAPTER 31 - INSTRUMENTS 1(96)
