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DFCS - MACH TRIM ANALOG INTERFACE
22-11-00
Page 68
D633A101-SHZ1 Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
These components have an interface with the FCCs to select the
VHF navigation antennas. They also prevent a change in
frequency of the multi-mode receivers (MMR) during an
autopilot approach mode:
* Dual VOR/LOC antenna
* Dual Localizer antenna
* RF power dividers 1 and 2
* Localizer antenna switches 1 and 2
* IFSAU
* MMR receivers 1 and 2
* Radio altimeters (RA) 1 and 2
* Capt and F/O navigation control panels.
VOR/LOC Antenna
The VOR/LOC antenna receives the VOR and localizer signals
and sends them through the RF power dividers to localizer
antenna switches 1 and 2.
Localizer Antennas
These antennas receive the localizer signal and send it directly
to the localizer antenna switches.
Localizer Antenna Switches
The localizer antenna switch selects the VOR/LOC antenna or
the localizer antenna. If the FCC is in the approach or localizer
mode, it sends an ILS test inhibit/antenna signal to the IFSAU.
This signal energizes a switch which sends a ground to one
side of the switch. If the navigation control panel selects a
localizer frequency, it sends 28v dc to the other side of the
switch. These signals cause the relay to energize so the
receivers use the localizer antenna in the nose radome. If you
do not select an ILS frequency, the receivers use the VOR/LOC
antenna in the vertical stabilizer. Also, if you do not use the FCC
in the approach or localizer mode, the receivers use the VOR/
LOC antenna.
Each switch sends a signal to its onside FCC to tell it which
antenna is in use.
FCC
When the A system autopilot or flight director is in the approach
or localizer mode, it sends an ILS test inhibit/antenna A signal
the IFSAU. It also sends an ILS receiver tuning inhibit signal to
these components:
* MMR 1
* RA 1
* Capt navigation control panel.
DFCS - VHF NAVIGATION ANTENNA SWITCHING ANALOG INTERFACE
EFFECTIVITY
SHZ ALL 22-11-00
Page 69
D633A101-SHZ1 Feb 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-025
When the B system autopilot or flight director is in the approach
or localizer mode, it sends an ILS test inhibit/antenna B signal
the IFSAU. It also sends an ILS receiver tuning inhibit signal to
these components:
* MMR 2
* RA 2
* F/O navigation control panel.
The tune inhibit signal does not let the control panel and
receivers tune to an unwanted frequency unless the crew
pushes the transfer switch on the nav control panel.
DFCS - VHF NAVIGATION ANTENNA SWITCHING ANALOG INTERFACE
EFFECTIVITY
SHZ ALL 22-11-00
Page 70
D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-025
DFCS - VHF NAVIGATION ANTENNA SWITCHING ANALOG INTERFACE
DFCS - VHF NAVIGATION ANTENNA SWITCHING ANALOG INTERFACE
EFFECTIVITY
SHZ ALL 22-11-00
Page 71
D633A101-SHZ1 Jun 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
22-11-00-025
General
These components have an interface with the FCCs as part of
the engage and interlock circuit:
* IRS transfer switch
* VHF navigation transfer switch
* Frequency transfer switch on the Capt and F/O navigation
control panels.
The DFCS monitors these switches to see if a change occurs.
The sensor output that the DFCS uses for an active mode in the
autopilot or flight director must show on either the instruments
for the captain or first officer. If it does not, the DFCS will not
allow the autopilot or flight director mode. If a switch occurs
such that both autopilots and instruments on both sides receive
data for the same sensor, dual autopilot and dual flight director
modes can not occur.
IRS Transfer Switch
If you change the IRS functions from NORMAL to BOTH ON 1 or
BOTH ON 2, the FCCs receive the change from the IRS transfer
switch. When the pilots change away from one of the IRSs, out
of the NORMAL position, the autopilot disengages and the flight
director commands will BOV on the side that changed (channel
A if BOTH ON 2).
Normally, the FCCs use pitch and heading data from the on-side
IRS and roll data from the off-side IRS. The autopilot will engage
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