连续下降最终进近 Continuous Descent Final Approach (CDFA)(2)

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All Boeing Models Have a V/S
Constant (Angle) Approach Published
● FCOM (Flight Crew Operations Manual)
– Supplementary Procedures
● FCTM (Flight Crew Training Manual)
– Continuous Descent Final Approach (CDFA)
BOEING is a trademark of Boeing Management Company.
Copyright © 2007 Boeing. All rights reserved. CDFA.15
FCOM (Flight Crew Operations Manual)
Supplementary Procedures

FCOM (Flight Crew Operations Manual)
Supplementary Procedures (continued)

FCTM (Flight Crew Training Manual)
Continuous Descent Final Approach (CDFA)

Constant angle approaches for “classic”
airplanes
● 707, 727, 737-200, 747-100/200 Non-ILS approach procedures
now require constant approach methods angle using available
pitch modes.
● Techniques for selecting the appropriate vertical speed and
managing the vertical path are now included in the FCOM
procedure

Goal Is to Establish a Constant Angle

FCOM (Flight Crew Operations Manual)
● Set desired V/S to descend to MDA(H)
● Use a V/S that results no level flight segment at MDA(H)
Approach Plate
● Using 300 feet per mile for a 3° path
(3 NM 2NM etc )
example: 900 feet - NM, 600 feet - 2NM, etc.)

V/S (Constant Angle)

Continuous Descent Final Approach
The Present
● V/S (constant angle)
● VNAV

All Boeing Models Have a VNAV
Approach Published
● FCOM (Flight Crew Operations Manual)
– Normal Procedures
● FCTM (Flight Crew Training Manual)
– VNAV-Approach

FCOM (Flight Crew Operations Manual)
Normal Procedures

FCTM (Flight Crew Training Manual)
VNAV Approach

VNAV
● VNAV is the preferred method for accomplishing non-ILS approaches that have an appropriate vertical path defined on the FMC LEGS page
● Automatic flight is the preferred method of flying non-ILS approaches
Note: Currently, the VNAV PTH mode contains no path deviation alerting. For this reason, the autopilot should remain engaged until suitable visual reference has been established.
Database Selection
● An approach procedure selected through the FMC ARRIVALS page provides the simplest method of selecting proper waypoints
● Procedures in the database comply with obstruction clearance criteria for non-ILS approaches
– No waypoints may be added or deleted between the FAF and the MAP – why?
– FMC “on approach” logic is partially or completely disabled
– VNAV obstacle clearance may be affected
Two Types of Approaches in the Navigation
1 Approaches Database
1. with a glide path (GP) angle displayed on the final approach segment of the LEGS page
– Complies with final approach step down altitudes FMC Legs Page: (737 / 747 / 757 / 767 / 777 / 787) Two Types of Approaches in the Navigation
　
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