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5.48 FCT 767 (TM)
Minimum Descent Altitude (MDA (H))/ Decision Altitude
(DA(H))
Non-ILS approach using VNAV
When specifically authorized by the instrument procedure and regulatory
authority, approaches may be flown to the following minima:
• a published VNAV DA(H)
• a published MDA(H) used as a decision altitude.
When either of the above minima are not specifically authorized, use the MDA(H)
specified for the instrument procedure.
The diagram below illustrates an approach procedure containing DA(H) and
MDA(H) minimums for approaches using LNAV/VNAV or LNAV only.
Note: Some non-ILS approaches specify a VNAV DA(H). Regulations may
require use of the autopilot in the VNAV PTH mode to permit use of the
DA(H).
When reaching the DA(H) or MDA(H), be prepared to continue the approach to
landing or execute an immediate go-around. If continuing to landing, disengage
the autopilot and disconnect the autothrottle no later than the single autopilot
minimum use height.
Note: If using an MDA(H), initiating a missed approach approximately 50 feet
above MDA(H) may be necessary to avoid descending below the MDA(H)
during the missed approach, if required for the procedure or by the
regulatory authority.
STRAIGHT-IN LANDING RWY 28R
LNAV/VNAV
CIRCLE - TO - LAND
LNAV
A
B
C
D
DA(H)720’(709’) MDA(H)1000’(989’)
ALS out ALS out
2
21/4
21/2
21/2 3
RVR40or 3/4
RVR50or 1
RVR60or 11/4
11/2
MDA(H)
Max
Kts
90
120
140
160
1000’(989’) - 21/2
1000’(989’) - 3
1000’(989’) - 3
October 31, 2004
767 Flight Crew Training Manual
Approach and Missed Approach
Copyright © The Boeing Company. See title page for details.
FCT 767 (TM) 5.49
The pilot monitoring should expand the instrument scan to include outside visual
cues when approaching DA(H) or MDA(H). Do not continue the approach below
DA(H) or MDA(H) unless the airplane is in a position from which a normal
approach to the runway of intended landing can be made and suitable visual
reference can be maintained. Upon arrival at DA(H) or MDA(H) or any time
thereafter, if any of the above requirements are not met, immediately execute the
missed approach procedure.
When suitable visual reference is established, maintain the descent path to the
flare. Do not descend below the visual glide path. While VNAV PTH guidance
may still be used as a reference once the airplane is below DA(H) or MDA(H), the
primary means of approach guidance is visual.
Note: VNAV path guidance transitions to level flight once the missed approach
fix is passed.
Vertical Speed Approach
Use the MDA(H) specified for the instrument procedure.
The pilot monitoring should expand the instrument scan to include outside visual
cues when approaching MDA(H). Do not continue the approach below MDA(H)
unless the airplane is in a position from which a normal approach to the runway
of intended landing can be made and suitable visual reference can be maintained.
Upon arrival at MDA(H) or any time thereafter, if any of the above requirements
are not met, immediately execute the missed approach procedure.
When suitable visual reference is established, maintain the descent path to the
flare. Do not descend below the visual glide path.
Visual Descent Point
For a non-ILS approach, the VDP is defined as the position on final approach from
which a normal descent from the MDA(H) to the runway touchdown point may
be initiated when suitable visual reference is established. If the airplane arrives at
the VDP, a stabilized visual segment is much easier to achieve since little or no
flight path adjustment is required to continue to a normal touchdown.
VDPs are indicated on some non-ILS approach charts by a "V" symbol. The
distance to the runway is shown below the “V” symbol. If no VDP is given, the
crew can determine the point where to begin the visual descent by determining the
height above the airport (HAA) of the MDA(H) and use 300 feet per NM distance
to the runway.
In the following example, an MDA(H) of 550 feet MSL with a 100 feet
touchdown zone elevation results in a HAA of 450 feet. At 300 feet per NM, the
point to begin the visual descent is 1 ½ NM distance from the runway.
October 31, 2004
767 Flight Crew Training Manual
Approach and Missed Approach
Copyright © The Boeing Company. See title page for details.
5.50 FCT 767 (TM)
Most VDPs are between 1 and 2 NM from the runway. The following table
　
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本文鏈接地址：767機組訓練手冊Flight Crew Training Manual (FCTM)767(82)