787 Flight Crew Operations Manual
DO NOT USE FOR FLIGHT
Flight Management, Navigation -
Navigation Systems Description
Copyright © The Boeing Company. See title page for details.
D615Z003-TBC 11.20.13
ILS approach tuning inhibit is active when:
• the autopilot is engaged and either the localizer or glideslope is captured
• only the flight director is engaged, and either the localizer or the glideslope
is captured, and the airplane is below 500 feet radio altitude, or
• on the ground, the localizer is alive, airplane heading is within 45º of the
localizer front course, and groundspeed is greater than 40 knots
ILS tuning is again enabled when:
• either TO/GA switch is pushed
• the autopilot is disengaged and both flight director switches are switched
off, or
• the MCP approach mode is deselected above 1500 feet radio altitude
The ILS frequency is automatically retuned when ILS tuning is enabled and a new
approach is selected on the CDU.
In the unlikely event that all three FMCs fail, or if all of the large displays fail, the
left ILS can be tuned from ALTN NAV RADIO page 2/2 on the TCP.
ILS Displays
The tuned ILS frequency displays on the PFD and on the ND in the approach
mode.
When both ILS receivers are operating, deviations from the left ILS are displayed
on the captain’s PFD, and deviations from the right ILS are displayed on the first
officer’s PFD. If an ILS receiver fails, data from the remaining ILS is displayed
on both the captain's and first officer's displays and the EICAS caution message
SINGLE SOURCE APPROACH is displayed. Front or back course deviation is
determined from airplane heading.
Navaid Identifier Decoding
The Morse code identifier of a tuned VOR, ILS, DME, or ADF can be converted
to alpha characters. The decoded identifier then displays on the PFD and ND. The
crew should monitor this identifier for correct navigation radio reception. The
identifier name is not compared with the FMC database.
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.
August 14, 2009
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