(b)  
Attitude Alert (Airplanes with comparator display pin connected) 1) The pitch and roll data displayed by the left and right

 EFIS, are compared in the left and right symbol generators. The pitch and roll data from each symbol generator is transferred to the opposite symbol generator by the cross-tie bus between the two symbol generators. The symbol generator which first senses an attitude difference greater than 3 degrees, will send an attitude alert signal to the opposite EFIS symbol generator, so that both EADIs display the alert message simultaneously. If the pitch and roll data from IRU-L or IRU-R is invalid, or the EFI transfer switch is in BOTH ON 1 or BOTH ON 2 position, the EADI's will display a COMP flag. If the IRS transfer switch is in BOTH ON 1 or BOTH ON 2 position, the attitude alert displays are inhibited.
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737-300/400/500MAINTENANCE MANUAL
 (c)
Curved Trend Vector

 1)  The curved trend vector is computed by the symbol generator, and displayed on the EHSI in MAP and CTR MAP modes. The segmented curve predicts directional trend, which is calculated based on present position, ground speed and cross-track acceleration. The dashed lines show predicted airplane position at the end of 30, 60, and 90 second intervals. The amount of curve is based on the cross-track acceleration value.

 (d)
NAV/IRU Position Difference

 1)  The NAV/IRU position difference indication is displayed on the EHSI, when the following two conditions are both met: a) The EHSI is displaying the MAP, CTR MAP, or NAV (if
 applicable) mode.
 b)  The difference in present position, between one of the IRUs and the FMC calculated position, equals or exceeds 12 nautical miles. If the difference occurs, a NAV/IRU position difference indication will appear on the EHSI. However, the indication will include the present position difference between both IRUs and the FMC.
 2)  The NAV/IRU position difference indication consists of a numerical readout, showing the difference between the IRU and the FMC calculated position, with an arrow pointing to the IRU position, and a letter designating the applicable IRU.
 (e) Range Disagreement Message
 1)  The range disagreement message is displayed on the EHSI, when the following two conditions are both met: a) The EHSI is displaying a mode, in which route data or
 weather radar data can be displayed.
 b)  The range selected on the EFIS control panel disagrees with the range of the data received from the FMC, or the range of the data received from the weather radar.
 (f) Course Deviation and TO/FROM Indication
 1)  Course deviation is computed by the symbol generator, and is displayed on the EHSI when one of the following conditions are met: a) The EHSI is displaying a VOR mode, and the VHF NAV
 receiver is tuned to a valid VOR station.
 b)  The EHSI is displaying an ILS mode, and the VHF NAV receiver is tuned to a valid ILS station.
 2)  The TO/FROM indication is displayed on the EHSI, when the EHSI is in a VOR mode, and the VHF NAV receiver is tuned to a valid VOR station.
 11. EFIS - FMCS Interface (Fig. 6)_____________________
 A.  The EFIS control panel transmits range and mode data to the FMCS. The map mode display switches, on the control panel, also transmit data to the FMCS. The data are sent on an ARINC 429 digital data bus.
 B.  Separate EFIS control panels for the captain and the first officer allow each operator to independently display FMCS data on the onside EHSI.
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A 737-300/400/500MAINTENANCE MANUAL

ADC CAS

LRRA R/T RADIO ALT
EFIS CP SELECTED DH

DISPLAYED ON EADI
DH RESET

IRU PITCH & ROLL
PITCH, ROLL, & ATT
ALERT FROM OPPOSITE SG

EFIS CP RANGE
FMC GROUND SPD,
 XTK ACCEL, PRES POS
　
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