2
K. (2)
The MLS
receiver transmits ARINC 429 labels for the purpose of
flight guidance, crew display, and internal monitoring. Once these
labels are transmitted by the
MLS receiver, they are switched into
the SG-884 Symbol Generator by an external relay. The DC-884
Display Controller energizes this relay based on flight crew
selection of MLS as the active or preview nav source.
A Morse code station identifier is decoded by the receiver and
output as an audio signal, a discrete signal and digitally on both
buses.
The MLS system in the G-IV is configured as a dual receiver and dual
control head system. Each MLS receiver tunes a DME in a sharing
scheme with the other equipment on the aircraft.
MLS only controls
DME
when NAV is not selected. As MLS uses the DME it will be normal
to see “F---” in the NAV control head window.
MLS No. 1 tunes No. 1
DME receiver, MLS No. 2 tunes No. 2 DME receiver. This DME
information is then sent to the symbol generators with the paired
MLS receiver as selected by the display controller.
MLS Displays
MLS is selected on each DC-884 Display Controller with both onside
and offside
sources available.
MLS 1 FAIL or MLS 2 FAIL is displayed in the CAS as appropriate in
the G-IV
dual installation.
MLS FAIL is also supported in the
FC-880 Fault Warning Computer, but is
for single installations.
(a) Primary Flight Display (Figure 253.7)
Annunciation
for lateral and vertical modes with MLS are AZ and
GP respectively, and are displayed at the top of the PFD as
with other nav
sources. AZ and GP are displayed in white when
armed, boxed
in green for five seconds when captured, and green
with no box after five
seconds.
The vertical deviation indicator beside the attitude sphere is
green and is labelled P for path in glidepath. Lateral
deviation on the compass portion of the display is conventional
and also green.
The NAV source annunciator displays the active source as either
MLS 1 or MLS 2 as appropriate. This is displayed in white
unless the pilot and copilot select the same NAV
source when
they are in amber.
Directly below it is the collocated DME
display. The distance display will be dashed if DME is
unavailable.
As the G-IV MLS is configured for front azimuth
only, there is
no need for a TO/FROM indicator.
approaches
22-14-00
Page 298.36.13
Apr 15/93
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