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annunciator is driven from the “B” FCC when in the approach mode after
localizer capture. In all other modes, both flight mode annunciators are driven
from the FCC associated with the first F/D turned on.
The Captain’s F/D command bars are always driven from the “A” FCC. The
F/O’s F/D command bars are always driven from the “B” FCC. Both F/Ds
should be ON for the approach to provide F/D guidance in the event of a goaround.
(The Pilot Flying should place his F/D switch ON first.)
Final Approach
A 45-degree or less intercept angle is optimum. Higher intercept angles and
airspeeds may cause course overshoot. The APP mode should be armed prior to
being within 5 degrees of course centerline. Otherwise the adaptive capture
feature may not be able to capture the course correctly, resulting in undesirable
overshoots.
Approach mode selection arms the AFDS to capture the localizer and
glideslope. It must be engaged for dual or single channel autopilot precision
approach operations. The approach mode enables dual autopilot selection if
desired. After setting the localizer frequency and course, pressing the APP
switch selects the APP mode. The APP switch illuminates, subsequently arming
both VOR LOC and GS and permits selecting CMD on the second A/P. If the
second autopilot is engaged, it should be available for automatic engagement
after LOC and GS capture and descent below 1500 feet RA.
Sec. 3 Page 196 737
Rev. 11/15/02 #41 Continental Flight Manual
Upon localizer capture, VOR LOC annunciates. SINGLE CH / 1 CH is annunciated for
A/P status, the previous roll mode disengages and the aircraft turns to track the
localizer signal.
Localizer capture occurs at a variable point dependent on intercept angle, speed
and localizer deviation and rate, but never at less than ½ dot. During localizer
capture, bank limit is 30 degrees regardless of bank limit selection.
After localizer capture, select a heading to match the approach course heading.
Maximum bank angle is reduced to 8 degrees after LOC capture.
Localizer False Course Capture
Auto Flight Control System (AFCS) equipped aircraft cannot be totally
protected from false localizer captures. False captures are short lived deviations
because they will not be followed when the published localizer course signal
guidance becomes valid.
False localizer course captures can occur at azimuths anywhere from 8 degrees
to 12 degrees azimuth from the published localizer course. This equates to
approximately 1.3 NM when intercepting the localizer at 10 NM from the
threshold.
Pilots should use all available navaids and the FMCS to ensure the correct
localizer course is captured. Should a false localizer course be captured, it may
be necessary to deselect and re-arm the APP mode in order to intercept the
correct localizer course. If both LOC and GS have captured, the APP mode can be
exited only by pressing a TO/GA switch or by disengaging the A/P and turning off
both F/D switches or retuning a VHF nav receiver or manual override to CWS
pitch.
The aircraft must be stabilized on the localizer and glidepath prior to
descending below 1000 feet above TDZE if in IMC.
737 Sec. 3 Page 197
Flight Manual Continental Rev. 11/15/02 #41
RAW DATA
· > ILS navigation signals are displayed on the ADI and HSI when the
appropriate HSI switch is in VOR/ILS.
· >@BCD ILS navigation signals are displayed on the EADI.
The same signals are displayed on the HSI when the display mode is
selected to FULL or EXP VOR/ILS.
The course deviation display on the ADI (Runway Symbol) will indicate only 1
dot deviation from the ILS beam center. On the EFIS EADI the normal
localizer deviation scale is one degree per dot. When the course deviation on
the EADI is approximately 5/8 degree deviation (5/8 dot) and the VOR/LOC or APP
mode is engaged, the scale automatically expands to ½ degree deviation per dot.
The course deviations on the HSI/EHSI indicate the full 2 dot deviations from
the ILS beam center. Additional ILS raw data can be displayed on the standby
horizon (EFIS aircraft) when the ILS position is selected.
The HSI/EHSI is the primary navigation instrument used during a raw data ILS
approach. Lateral navigation is performed by maneuvering the aircraft so as to
place the HSI/EHSI aircraft symbol in the correct relationship to the course
deviation bar. The course deviation bar will represent the ILS localizer when
the localizer front course is selected using the course selector.
Flaps 5 or flaps 10, and appropriate maneuvering speed, is recommended when
maneuvering to intercept the localizer.
　
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