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Due to the large variation in ground station identifier quality, the decode feature
may incorrectly convert the intended identifier name. Examples: the Hong Kong
localizer “KL” may display as “KAI”, or the Boeing Field ILS may display as
“QBFI” or “TTTT” instead of “IBFI.”
Pilots should verify the identity of the tuned navigation station from the audio
Morse code when the tuned frequency remains displayed or an incorrect identifier
displays.
787 Flight Crew Operations Manual
Flight Management, Navigation -
Navigation Systems Description
Boeing Proprietary 11.20.11
VOR
Two VOR receivers are usually tuned by the FMC but, can be tuned manually by
the crew. The tuned VORs display on the ND and may be used for position
updates.
VOR Tuning
The crew manually tunes VORs on the NAV RADIO page.
The FMC can tune a VOR and a collocated DME for position updates. The FMC
uses VOR/DME radio position updates when more accurate sources are not
available. Specific VOR/DME pairs can be inhibited on the REF NAV DATA
page. If the crew enters two VOR identifiers on the NAV RADIO page, then the
FMC cannot tune any other station for VOR/DME updates.
VOR Displays
The NAV RADIO page displays FMC tuned or manually tuned VOR data. POS
REF page 2/4 displays the identifier of the VOR and DME pair used for position
updates.
The ND displays the identifier or frequency of the VORs tuned on the NAV
RADIO page. The FMC usually tunes the same VOR in the left and the right. The
ND VOR L and VOR R data are usually the same.
Left and right VOR bearing pointers display on the ND map compass rose when
the related VOR checkbox on the ND pull down menu is selected. The tuned
frequency or identifier, and associated DME distances are also displayed in the
lower corners of the ND when the VORs are selected on the ND pull down menu.
Transponder
Two ATC transponders and the traffic alert and collision avoidance system
(TCAS) are controlled from the ATP and the TCP.
Alerting and Transponder Control Panel
The ATP controls the following Transponder/TCAS modes:
• STBY
• ALT RPTG OFF
• XPDR
• TA ONLY
• TA/RA.
Traffic displays if the transponder mode selector is in TA ONLY or TA/RA. In
flight, the selected transponder activates beacon and altitude reporting when the
transponder mode selector is in XPDR, TA ONLY, or TA/RA.
787 Flight Crew Operations Manual
Flight Management, Navigation -
Navigation Systems Description
11.20.12 Boeing Proprietary
If the ATP becomes inoperative the Transponder/TCAS modes can be set through
the backup function of the TCP .
Tuning and Control Panel - Normal Operation
The transponder control pages on the TCP are accessed by selecting the XPDR
mode select key.
The TCP controls:
• Mode A numeric code
• ATC Ident function
• TCAS envelope (Above, Normal, or Below)
• Altitude Mode (Absolute or Relative)
• Transponder select (Left or Right).
The Captain and First Officer TCPs share control of the:
• XPDR code
• IDENT function
• left or right side selection.
Any changes made are also reflected on the center and cross-side TCPs. TCAS
envelope and altitude settings control only the own-side TCAS display, and
changes on one TCP are not reflected on the cross-side TCP.
The center TCP can control both left and right side transponders. When XPDR is
selected from the center TCP the flight crew is prompted to select either Captain
(left) or First Officer (right).
Should the on-side transponder fail, the TCP automatically switches to the
cross-side transponder. A status message is logged and a status prompt displayed.
Should both transponders fail, the EICAS advisory message TRANSPONDER is
displayed. If altitude reporting fails, the transponder can be switched to the
alternate altitude source. Refer to Chapter 15, Section 10, Traffic Alert and
Collision Avoidance System (TCAS), for a description of TCAS.
Tuning and Control Panel - ATP Inoperative
If the ATP fails, the EICAS advisory message TRANSPONDER PANEL is
displayed and the transponder and TCAS modes must be set using the TCP.
The ALERT/XPDR CTL page of the TCP is accessed from the MENU page by
turning ALERT/XPDR CTL to ON (LSK 1R), and then selecting the
ALERT/XPDR CTL page (LSK 2R).
When selected ON the transponder and TCAS modes can be set via the
ALERT/XPDR CTL page.
787 Flight Crew Operations Manual
Flight Management, Navigation -
Navigation Systems Description
Boeing Proprietary 11.20.13
　
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