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P6-2 CB PANEL
A/P Red Warning Lights Schematic Figure 18
A737-300/400/500MAINTENANCE MANUAL
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28V DC
28V DC
M198 MODE CONTROL PANEL (P7)
A/P - A/T Amber Warning Lights Schematic Figure 19
A
737-300/400/500MAINTENANCE MANUAL
H. F/D Warning Flag and Bar Bias Operation (Fig. 20)
(1)
The computer (F/D) warning flag located on the ADI is in view if the FCC or ADI is not operational. The bars are biased out of view if the command signal from the FCC is not valid.
(2)
The FCC suppies a F/D valid output provided the continuous monitor and the FCC power supply are valid. The continuous monitor checks the operation of the flight control computer. Checks are made on ROM, program memory, RAM read/write operation, program flow, D/A-A/D converters, software module processors. F/D valid is used to retract the computer flag provided the servo amplifiers are null within the ADI. On the captains F/D system, the standby inverter is also monitored.
(3)
Normally each FCC provides it's own bar bias logic, however, in TO or GA modes or dual F/D APP modes when a A/C Bus XFR is made, the bar bias control is transferred to the foreign FCC (Gate 1 thru 8). At the same time the F/D commands are transferred to the foreign FCC (switches S5 and S6). Bar bias from either roll or pitch closes S1. This provides a bar bias output to the ADI. S5 provides an up bias to the command bar while S6 grounds the roll command allowing the bars to level.
(4)
The roll bar bias Fig. 21, is used to bias the F/D bar out of view if information is not reliable. The matrix displays the events and associated mode that generates roll bar bias.
(a)
Event 1 - Flight director off.
(b)
Event 2 - Flight director on but a mode not selected.
(c)
Event 3 - The selected VHF NAV is not valid. A delay time of 8 seconds for a VOR frequency or 2 seconds for LOC is provided.
(d)
Event 4 - Selected L NAV computer is not valid.
(e)
Event 5 - A VOR frequency is tuned after capturing the localizer.
(f)
Event 6 - The foreign A/P is in CMD and LOC capture, however, the localizer has a VOR frequency tuned.
(g)
Event 7 - The foreign A/P is in CMD and the VOR captured, however, the LOC frequency is tuned.
(h)
Event 8 - The radio altimeter is not valid for more than 2 seconds.
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28V
D299
DC
23
ON
A F/D SW
28V
DC
23 ON B F/D SW M198 DFCS MODE CONTROL
PANEL (P7) TO B
FCC
F/D Warning Flag And Bar Bias Schematic
Figure 20
MODES
VOR/LOC APP
EVENT MODE NO TO HDG LNAV ENGA VOR ENGA LOC ENGA LOC OC APP GA
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