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touchdown zone, touchdown lights and markings) should become clearly visible
resulting in a successful approach. After acquiring the red terminating bars or red
side row bars, if the runway environment does not become distinctly visible
execute an immediate missed approach.
Category III operations using fail passive autoland systems typically reach a DH
of 50 ft. when approaching the threshold. In this instance, regulations require that
the runway environment be clearly visible. If not, execute an immediate missed
approach.
Category III operations using fail operational autoland systems normally do not
require specific visual references below AH.
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) 5.19
A review of the approach and runway lighting systems available during the
approach briefing is recommended as the pilot has only a few seconds to identify
the lights required to continue the approach. For all low visibility approaches, a
review of the airport diagram, expected runway exit, runway remaining lighting
and expected taxi route during the approach briefing is recommended.
Regulatory agencies may require an additional 15% be added to the dry landing
distance. Agencies may also require wind speed limitations less than maximum
autoland wind speeds found in the FCOM.
AFDS System Configuration
The system configurations listed in this section may not include all of the systems
and equipment required for each type of operation. The AFM or operating
regulations may prescribe additional systems such as autobrakes, autothrottle or
rain removal.
More detailed information concerning Category II and Category III operational
requirements can be found in FAA advisory circulars or similar documents from
other regulatory agencies.
Category II Operations
Category II approaches may be conducted using the autopilot or flight director
only, with one or two engines.
Category II Approach Autopilot
The following equipment must be operative for an automatic approach requiring
the use of Category II minima:
• LAND 3 or LAND 2 annunciated and EICAS messages SGL SOURCE
DISPLAYS, SGL SOURCE RAD ALT or SINGLE SOURCE ILS not
displayed.
Category II Approach Flight Director
The following equipment must be operative for a Flight Director (FD) approach
requiring the use of Category II minima:
• normal flight controls
• EICAS messages SGL SOURCE DISPLAYS, SGL SOURCE RAD ALT,
SINGLE SOURCE F/D or SINGLE SOURCE ILS not displayed
777-200 - 777-300ER
• ADIRU.
787-8
• IRS.
October 31, 2006
777/787 Flight Crew Training Manual
Approach and Missed Approach
Copyright © The Boeing Company. See title page for details.
5.20 FCT 777/787 Preliminary (TM)
Category III Operations
Category III operations are based on an approach to touchdown using the
automatic landing system. Normal operations should not require pilot
intervention. However, pilot intervention should be anticipated in the event
inadequate airplane performance is suspected, or when an automatic landing
cannot be safely accomplished in the touchdown zone. Guard the controls on
approach through the landing roll and be prepared to take over manually, if
required.
777-200 - 777-300ER
The airplane is certified for Category IIIb operations with two engines operating
or with one engine operating for flaps 20 or flaps 30 landing.
787-8
The airplane is certified for Category IIIb operations with two engines operating
or with one engine operating for flaps 20, 25, or flaps 30 landing.
Category IIIa/Autoland
For Category IIIa operations the following equipment must be operative and
LAND 2 or LAND 3 annunciated:
• 2 autoland status annunciators
• EICAS messages SGL SOURCE DISPLAYS, SGL SOURCE RAD ALT
or SINGLE SOURCE ILS not displayed.
Category IIIb/Autoland
For Category IIIb operations, visual reference is not normally a specific
requirement for continuation of the approach to touchdown.
Category IIIb operations require the following equipment to be operative and
LAND 3 annunciated:
• autothrottle engaged
• 2 autoland status annunciators
• EICAS messages SGL SOURCE DISPLAYS, SGL SOURCE RAD ALT
or SINGLE SOURCE ILS not displayed.
AFDS Faults
Faults leading to non-normal operations can be divided into two categories:
• those occurring above AH
• those occurring at or below alert height.
Within these categories many non-normal situations or scenarios are possible. The
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787机组训练手册Flight Crew Training Manual 787(72)
