CAPTAIN'S (LEFT) AND FIRST OFFICER'S (RIGHT)
EFIS CONTROL PANELS
A
(P3) SEE B
AFT ELECTRONICS PANEL (P8)
C
FLT DIR L
C R
NAV FMC L
LEFT TRANSMIT ANTENNA
LEFT RECEIVE ANTENNA
CENTER RECEIVE ANTENNA NO. 2
RIGHT RECEIVE ANTENNA
FLT DIR
R
C
L
NAV
R FMC
FMC R
L FMC
CDU L
R CDU
CDU C
C CDU
S EIU
EIU S
O AUTO
AUTO O
L
C
C
R
U
U
R
R
C
C
R
L
E
E
S
S
IRS
IRS
E
E
L
R
L
L
C
C
E
E
C
C
R
L
T
T
AIR DATA
AIR DATA
L
R
C
C
R
L
(LEFT) (RIGHT) EIU SOURCE SELECT PANELS B
C20843
Radio Altimeter/Interface - Component Location
Figure 1 (Sheet 1)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
34-33-00
ALL ú ú 04 Page 2 ú Jun 10/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL
CONTROL DISPLAY UNITS
D
LCD
TEST
SWITCHES
TEST CONNECTOR
LEFT, CENTER, RIGHT RADIO
ALTIMETER RECEIVER/TRANSMITTERS
E
Radio Altimeter/Interface - Component Location
Figure 1 (Sheet 2)
L33755
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
34-33-00
ALL ú ú 16 Page 3 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
(b)
The status lights indicate system status for the TEST switch initiated self-test only. A green light indicates a go condition and the red light(s) a no-go condition.
(c)
The red IND light is not used since the usual radio altimeter height indicator unit is replaced with display of radio altitude at the captain's and first officer's primary flight displays.
(3)
A maintenance test connector on the front panel is used to connect a test set for system checks, radio altitude fixed trip checks, and check of radio altitudes used by the GPWS, AFS, and other systems on the airplane.
(4)
The R/T front panel LCD screen and manual test switch operate as follows:
(a)
The TEST switch initiates a self-test which checks the R/T circuits and antennas.
(b)
When the front panel TEST switch is pushed and released, the TEST IN PROGRESS display is shown on the LCD screen and the transceiver goes through a self-test. The test continues for approximately 5 seconds. The TEST COMPLETE NO FAILURES display is shown for a test/pass condition. The TEST COMPLETE FAILURES display is shown for a test/fail condition. Pushing and releasing the RETURN switch shows the P/N and S/W display. Pushing and releasing the WHY switch shows the failures if a test fail condition has occurred.
(c)
The RS 232 connector on the lower portion of the front panel is used to connect a test set for system checks. The memory card slot of the front panel accepts a 20 MBytes memory module to update R/T memory or record data. The RS 232 connector and the memory card slot are not for use by line maintenance personel.
B. Antennas
(1)
Each R/T has its own transmit antenna and receive antenna. They are identical microstrip units with a characteristic impedance of 50 ohms.
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