G. System Test
S 865-088
(1) Prepare for the left VOR navigation system test:
(a)
Push the NAV RAD key on the left CDU to show the NAV RADIO page.
(b)
Put the approved VOR test frequency into the CDU scratch pad.
S 735-089
(2) Do the system test for the left VOR navigation system:
(a)
Push the line select key (LSK) adjacent to the VOR L display.
(b)
Make sure these results occur: 1) On the flight interphone speakers and headsets: a) VOR sound (1020 Hz tone) is heard. 2) On the captain's ND: a) The course deviation bar is aligned with the course
arrow. b) The narrow bearing pointer shows 180 |2 degrees.
(c)
Set the VOR selector on the ramp test set to 90.0, 180.0 and then 270.0 degrees.
(d)
Make sure these results occur:
1) On the captain's ND:
a) The narrow bearing pointer shows 270 |2, 0 |2, and then 90 |2 degrees.
(e)
Set the VOR selector on the ramp test set to 000.0 degrees.
S 865-091
(3) Prepare the CDU to do the system test for the right VOR navigation system:
(a)
Push the NAV RAD key on the right CDU to show the NAV RADIO page.
(b)
Put the approved VOR test frequency into the CDU scratch pad.
S 735-092
(4) Do the system test for the right VOR navigation system:
(a)
Push the LSK adjacent to the VOR R display.
(b)
Make sure these results occur: 1) On the flight interphone speakers and headsets: a) VOR sound (1020 Hz tone) is heard. 2) On the first officer's ND: a) The course deviation bar is aligned with the course
arrow. b) The wide bearing pointer shows 180 |2 degrees.
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747-400 MAINTENANCE MANUAL
(c)
Set the VOR selector on the ramp test set to 90.0, 180.0 and then 270.0 degrees.
(d)
Make sure these results occur:
1) On the first officer's ND:
a) The wide bearing pointer shows 270 |2, 0 |2, and then 90 |2 degrees.
(e)
Set the VOR selector on the ramp test set to 000.0 degrees.
H. EIU Interface Test
S 735-125
(1) Do the EIU interface test:
(a)
Open these circuit breakers:
1) P7 Overhead Circuit Breaker Panel
a) 7B21 NAV RADIO VOR R, or
NAV RADIO MKR VOR R b) 7F9 EIU L c) 7F15 EIU R
(b)
Set the source select switch for the EIU on the captain's source select module to the C position.
(c)
Make sure these results occur: 1) On the captain's ND: a) The course deviation bar is aligned with the course
arrow. b) The narrow bearing pointer shows 180 |2 degrees.
(d)
Open this circuit breaker:
1) P7 Overhead Circuit Breaker Panel a) 7A9 NAV RADIO MKR VOR L
(e)
Close this circuit breaker:
1) P7 Overhead Circuit Breaker Panel
a) 7B21 NAV RADIO VOR R, or NAV RADIO MKR VOR R
(f)
Set the source select switch for the EIU on the first officer's source select module to the C position.
(g)
Make sure these results occur: 1) On the first officer's ND: a) The course deviation bar is aligned with the course
arrow. b) The wide bearing pointer shows 180 |2 degrees.
(h)
Close these circuit breakers:
1) P7 Overhead Circuit Breaker Panel a) 7A9 NAV RADIO MKR VOR L b) 7F9 EIU L c) 7F15 EIU R
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ALL ú ú 14 Page 512 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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