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Airplanes with IAN are capable of using the MCP APP switch to execute
instrument approaches based on flight path guidance from the navigation radios,
the FMC, or a combination of both. All IAN approaches provide the functions,
indications and alerting features similar to an ILS approach. Although non-ILS
approaches using LNAV and VNAV can still be performed, IAN is normally used
in place of LNAV and VNAV because of improved approach displays, alerts and
standardized procedures.
IAN approach types:
• RNAV
• GPS
• VOR approach
• NDB approach
• LOC, LOC-BC, LDA, SDF, TACAN, or similar approaches.
Note: IAN deviation scales and annunciations are displayed on the HUD but are
not displayed on the ISFD.
IAN Requirements and Restrictions
• dual or single engine approaches are authorized
• waypoints in the navigation database from the FAF onward may not be
modified
• raw data monitoring is required during localizer based approaches.
During FMC based non-ILS approaches, raw data monitoring is
recommended when available in accordance with the techniques
described in the Non-ILS approach section in this chapter
• QFE operation is not authorized
• cold temperature altitude corrections are not permitted
• RNP appropriate for the approach must be used
• the autopilot is required until suitable visual reference is established when
performing an approach requiring an RNP of 0.15 or lower.
Flight Mode Annunciations and other IAN Features
FMAs vary depending on the source of the navigation guidance used for the
approach, navigation radio or FMC.
For localizer based approaches:
October 31, 2006
777/787 Flight Crew Training Manual
Approach and Missed Approach
Copyright © The Boeing Company. See title page for details.
FCT 777/787 Preliminary (TM) 5.47
If the FMC is used for lateral (course) guidance:
Approach Preparations for using IAN
IAN may be used with the flight director, single autopilot, or flown with raw data.
The procedure turn, initial approach, and final approach are similar to the ILS.
For FMC based approaches, a proper series of legs/waypoints describing the
approach route including an appropriate vertical path or glide path (GP) angle
must appear on the LEGS page. A GP angle displayed on the LEGS page means
the vertical path complies with final approach step down altitudes (minimum
altitude constraints). A glide path angle suitable for an IAN approach is one that
approximates 3° and crosses the runway threshold at approximately 50 feet.
The appropriate procedure must be selected in the FMC. If final approach course
guidance is derived from the localizer, the radios must be tuned to the appropriate
frequency. If final approach course guidance is derived from the FMC, radios must
be tuned to a VOR frequency.
Note: For all approaches, including B/C LOC approaches, the inbound front
course must be set in the MCP.
Final Approach using IAN
When on an intercept heading and cleared for the approach, select the APP mode.
Before engagement of the approach mode, grey lateral and vertical deviation
pointers (anticipation cues) are displayed in addition to the deviation pointers for
engaged modes. These pointers show the pilot the direction of the final approach
course and glide path relative to the airplane. As course and glide path capture
occurs, the appropriate pointers turn magenta.
APP mode should not be selected until:
• the guidance to be used for the final approach is tuned and identified (as
needed)
• the airplane is on an inbound intercept heading
Approach FMA
ILS with G/S out, LOC, LDA, SDF LOC and G/P
B/C LOC BCRS and G/P
Approach FMA
GPS, RNAV FAC and G/P
VOR, NDB, TACAN FAC and G/P
October 31, 2006
777/787 Flight Crew Training Manual
Approach and Missed Approach
Copyright © The Boeing Company. See title page for details.
5.48 FCT 777/787 Preliminary (TM)
• both lateral and vertical deviation pointers appear on the attitude display
in the proper position
• clearance for the approach has been received.
Deviation scales are proportional to RNP. Unlike the ILS localizer and glide slope
deviation scales, the IAN deviation scales do not become more sensitive as the
airplane approaches the runway. They provide consistent sensitivity throughout
the final approach segment based on the RNP.
GPWS glide slope alerting is provided on IAN airplanes during ILS and IAN
approaches. The GPWS glide slope alerting provides alerting when the airplane
deviates below the glide slope (ILS) or glide path (IAN) before reaching a full
　
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本文鏈接地址：787機組訓練手冊Flight Crew Training Manual 787(84)