737 Flight Crew Training  Manual Instrument Approach Using IAN (As installed) 737-600 - 737-900
Copyright . The Boeing Company. See title page for details.
5.52 FCT 737 (TM) October 31, 2006
Use of IAN - General
The approach profile illustrated depicts crew actions used during an approach using Integrated Approach Navigation (IAN). Since IAN approach techniques are similar to ILS approach techniques, only items considered unique to IAN are discussed in the remainder of this section. The approach profile illustrated assumes all preparations for the approach such as review of the approach procedure and setting of minima and radios, as required, are complete.
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 annunciations are not displayed on the HUD, standby ADI, or ISFD.
IAN Requirements and Restrictions
.  
airplanes must be equipped with FMC U10.5 or later and IAN FMA
displays

.  
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:
Approach  FMA 
ILS with G/S out, LOC, LDA, SDF  VOR/LOC and G/P 
B/C LOC  BCRS and G/P 

If the FMC is used for lateral (course) guidance:
Approach  FMA 
GPS, RNAV  FAC and G/P 
VOR, NDB, TACAN  FAC and G/P 

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

Copyright . The Boeing Company. See title page for details.
5.54  FCT 737 (TM)October 31, 2006
.  
both lateral and vertical deviation pointers appear on the attitude display
　
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