787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Communications -
System Description
Copyright © The Boeing Company. See title page for details.
D615Z003-TBC 5.20.3
In event of electrical power loss, the left VHF radio and left TCP continue to
operate on standby power.
VHF Page Displays
Four VHF page displays are used to tune the left, center and right VHF radios. The
main VHF page (1/X) is always displayed when the VHF mode select key is
pushed. The main display controls the active and standby frequency selection for
all three radios. The selected radio for each TCP is indicated by ACTIVE and
STBY titles above large white text of the radio name (L, C, R) and the current
frequencies assigned. Pushing another active or standby line select key changes
the radio to be tuned.
For the selected radio, the frequency transfer switch moves the pretuned, standby
frequency to become the active, tuned frequency. The previously active frequency
then becomes the standby frequency.
[Option - Active entry]
New frequencies are entered into the scratchpad. Entering the decimal and/or
following zeros for this new frequency are optional. The decimal is inserted
automatically when the line select key is pushed. Scratchpad frequencies can be
enter into either the active or standby windows. If an invalid frequency is entered,
an INVALID ENTRY scratchpad message is displayed. Pushing the clear key
erases the INVALID ENTRY message and displays the previous scratchpad entry.
Stored frequencies
VHF pages 2, 3, and 4 can contain up to eight stored frequencies for all three
radios (24 total). These frequencies can be entered manually into the TCP by the
flight crew.
Stored frequencies are accessed from the main VHF page by using the standby
frequency step control. Selecting UP or DN scrolls through the stored frequencies
for the active radio in the standby window. Once the desired frequency is
displayed in STBY, pushing the frequency transfer switch makes it active.
[Option - No auto clear of stored frequencies]
Frequencies stored during flight (VHF pages 2, 3, and 4) may be manually deleted
using the CLR key. Frequencies not manually deleted remain stored in the TCP
after flight is completed.
ATC Uplink
[Option - Active entry]
If an ATC uplink containing a VHF frequency is accepted, the uplink frequency is
displayed in the scratchpad preceded by a UL indicator. Line selecting this
frequency into the active, standby or a stored position clears the scratchpad. It also
turns the uplink frequency green in the uplink data block.
February 13, 2009
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