EHSI NAV FLAGS
Electronic Flight Instrument Displays
Figure 6 (Sheet 1)
A 737-300/400/500MAINTENANCE MANUAL
NORMAL INDICATIONS DATA ANOMALY INDICATIONS
DISPLAY PARAMETER LOCALIZERSCALE LOCALIZERPOINTER GLIDESLOPESCALEGLIDESLOPEPOINTER EXPANDED LOCALIZER NO-COMPUTED DATAEXPANDED LOCALIZER INVALID DATA (EXCEPT NCD)
(SEL CRS AND PRESENT TRACK ALSO REQUIREDFOR BACK CRS)LOCALIZER DEVIATION (VALID LOC FREG SELECTED) REMOVE DEV POINTER, RETAIN SCALE REMOVE DEV POINTER AND SCALEAND DISPLAY LOC FLAG
GLIDESLOPE DEVIATION REMOVE DEV POINTER, RETAIN SCALE REMOVE DEV POINTER AND SCALE
ELECTRONIC ATTITUDE DIRECTOR INDICATOR
Electronic Flight Instrument DisplaysFigure 6 (Sheet 2)
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34-31-02
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
NORMAL INDICATIONS DATA ANOMALY INDICATIONS
INPUT PARAMETERMHDG 127 116.80 SELECTEDCOURSETO/FROMINDICATION DEVIATIONBAR VOR FREQ MODEANNUC FROMEHSI DISPLAY - EXP VOR MODE FROM VOR 2 MHDG VOR 2 116.80 127EHSI DISPLAY - FULL VOR MHDGEHSI DISPLAY ------VOR 2NO-COMPUTED DATA127 INVALID DATAM VOR 2 HDGEHSI DISPLAY VORFLAG VOR127
VOR FREQUENCY REPLACE NUMERICS WITH SIX DASHES REMOVE NUMERICS
SELECTED COURSE REMOVE CRS POINTER AND DEV BAR SAME AS NCD
DEVIATION REMOVE DEV BAR AND RETAIN SCALE REMOVE DEV BAR AND SCALE.DISPLAY VOR FLAG
TO/FROM ANNUNCIATION REMOVE REMOVE
ELECTRONIC HORIZONTAL SITUATION INDICATOR - VOR
Electronic Flight Instrument DisplaysFigure 6 (Sheet 3)
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34-31-02
ú ú 05 Page 32 ú Nov 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
NORMAL INDICATIONS DATA ANOMALY INDICATIONS
INPUT PARAMETERMHDG 127 MODEANNUC 127 ILS 2EHSI DISPLAY - EXP ILS110.10 ILS FREQG/SDEVIATION DME 13.5 EHSI DISPLAY - FULL ILS ILS 2 110.10 MHDG NO-COMPUTED DATAMHDG 127EHSI DISPLAY ------DME 13.5ILS 2 INVALID DATAMHDG 127EHSI DISPLAY FLAG ILS 2LOC LOC DME 13.5
LOCALIZER DEVIATION REMOVE DEV BAR AND RETAIN SCALE REMOVE DEV BAR AND SCALE.DISPLAY LOC FLAG
GLIDESLOPE DEVIATION REMOVE DEV POINTER AND RETAIN SCALE REMOVE DEV POINTER AND SCALE
ILS FREQUENCY REPLACE NUMERICS WITH SIX DASHES REMOVE NUMERICS
ELECTRONIC HORIZONTAL SITUATION INDICATOR - ILS
Electronic Flight Instrument DisplaysFigure 6 (Sheet 4)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
(4) Standby Attitude/ILS Indicator Schematic (Fig. 7)
(a)
The standby attitude/ILS indicator receives 28 volts dc and 5-volt ac panel lighting as shown in the standby horizon system (AMM 34-25-02). The indicator is turned on by positioning the mode selector on front panel to ILS or B/CRS. A quick caging knob is provided for the attitude display.
(b)
The localizer and glide slope deviation displays are driven by inputs from the captain's or No. 1 navigation unit.
(c)
The vertical localizer pointer is driven horizontally to show localizer deviation. The VOR/LOC super flag signal energizes a solenoid to bias the LOC flag out of view which indicates a valid localizer deviation display.
(d)
The horizontal glide slope pointer is driven vertically to show glide slope deviation. The glide slope super flag signal energizes a solenoid to bias the G/S flag out of view which indicates a valid glide slope deviation display.
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