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• Disengage Autopilot/Autothrottle
At DA (or MDA + 50 feet)
• Continue to landing
or
• Go-Around
Approx 2 NM prior to FAF
• Set MDA/DA
• Verify/select roll mode (LNAV, or other)
• Select VNAV (VNAV PTH) & speed intervention
• Autopilot engaged
((RRWWXXXX oorr MMXXXXXX))
((FFAAFF))
The Boeing Company W100.43
Recommended Procedure if Use of
DA(H) Not Approved
• Set MDA(H) + 50’ using the minimums selector
• Use the same procedure as previously discussed
• Initiate the missed approach at MDA(H) + 50’ if
adequate visual reference is not established
The Boeing Company W100.44
Approach Example
RNP &
other info
VNAV
minimums
GP angle
The Boeing Company W100.45
Autopilot Use
• Autopilot use is recommended on VNAV
approaches
• Experience has shown autopilot use on non-ILS
approaches to be beneficial
• Better vertical and lateral path tracking
• Lower workload
• Less possibility of below path excursions
The Boeing Company W100.46
AFDS Mode Reversions from
VNAV PTH (747-400/757/767/777)
• The 747-400, 757/767 and 777 AFDS, once in
VNAV PTH and on approach, will not revert to any
other mode automatically except to climb above the
path in VNAV SPD if the placard speed is
approached
• VNAV PTH mode must be exited by another mode
selection or via go-around initiation
• With the AFDS engaged, the airplane will stay on
path
The Boeing Company W100.47
AFDS Mode Reversions from
VNAV PTH (737)
• The 737NG AFDS, once in VNAV PTH and on
approach, will not revert to any other mode with
landing flaps selected
• VNAV PTH mode must be exited by another mode
selection or via go-around initiation
• With the AFDS engaged, the airplane will stay on
path
Note: Earlier NG FCCs and all 737-3/4/500 FCCs
permit the AFDS to automatically revert to LVL CHG
if a significant under-speed occurs (alpha mode).
The Boeing Company W100.48
Raw Data Monitoring
• For all types of approaches that are based on
ground navigation aids raw data should be
monitored if available
• A raw data check prior to final approach may be
accomplished by:
– Using the POS function on the 737NG, 747-400,
767-400 and 777
– Using the VOR/ADF function on the 737-3/4/500
• The 757/767 still require a VOR deviation display for
VOR approaches on final approach
The Boeing Company W100.49
POS Function – FMC Position is
Verified if Raw Data Matches Map
R-200
R-120
DME raw data
GPS position
The Boeing Company W100.50
“On-Approach” Logic
• Criteria met for all airplanes using the published Boeing
VNAV procedure
• Raises the alerting level to Caution for UNABLE RNP
• Causes the RNP to change to approach RNP if not
manually entered
• Permits selection of the missed approach altitude and
continued descent in VNAV PTH (except 737 classic)
• Speed intervention is enabled in VNAV PTH mode
• For VOR approaches, the FMC auto-tunes the VOR and
automatically inserts the final approach course on the
NAV RAD page and on the navigation display
The Boeing Company W100.51
Waypoint Modifications for VNAV
Approaches
• Approach waypoints should normally be used “as is” from
the navigation data base
• Use of a VNAV DA(H) requires use of a GP angle
• A straight-in intercept course to the FAF is permissible for
radar vectored approaches
• Appropriate cold temperature corrections to waypoint
altitude constraints are permissible
• Do not add or delete waypoints in the final approach
segment!
The Boeing Company W100.52
Pilot-Constructed Approaches
• Navigation data base selection is required for RNAV and
GPS approaches
• Approaches from the navigation data base are preferred for
other types of approaches
• If no navigation data base approach is available and time
permits, a manually constructed approach may be flown
using LNAV provided:
– Navigation data base waypoints and the RW waypoint are
used
– VOR, DME or other raw data is used as the primary
navigation reference for the approach
The Boeing Company W100.53
Pilot-constructed approaches, cont.
• VNAV (using speed intervention) would be available
only if using an overlay approach such as an ILS
　
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