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Enstrom TH-28/480 Series Maintenance Manual Supplement 8
G1000H Integrated Flight Deck System
May
14/14
Page
1-7
A VOR/ILS localizer receiver that provides tuning from 108.00 to 117.95 MHz in 50
kHz increments.
An ILS glideslope receiver that provides tuning from 328.6 to 335.4 MHz as paired with
the frequency tuned on the VOR/ILS localizer receiver.
This installation contains two GIA 63H units. GIA 63H #1 unit is installed in rack mounted
in the upper console; GIA 63H #2 unit is installed in the keel. See
Figure 4. Upper Console
Mounted LRUs
and
Figure 5. Keel Mounted LRUs
.
GEA 71H Engine Aircraft I/O Unit
The GEA 71H is a micro-processor based input/output LRU used to monitor sensor inputs
and drive annunciator outputs for airframe and engine systems. The GEA 71H interfaces
with various sensors on the aircraft and communicates airframe and engine information
via RS-485 digital interface to GIA 63H IAU. The GIAs then interface with the GDU PFD
and MFD. Typically, the MFD shows engine instrumentation while the PFD normally
shows airframe alerts provided by the GEA 71H. Engine/airframe instrumentation is also
displayed on the PFD and/or MFD while the system is in reversionary mode.
The GEA 71H uses a configuration module temperature sensor and a thermocouple
sensor housed in a back shell assembly to monitor back shell junction temperatures to
maintain thermocouple accuracy.
This installation contains two rack mounted GEA 71H units. GEA 71H #1 unit is installed
in the upper console; GEA 71H #2 unit is installed in the keel. See
Figure 4. Upper
Console Mounted LRUs
and
Figure 5. Keel Mounted LRUs.
ST 32 Signal Conditioners
The ST 32 is dual function signal conditioner. It converts three channels of the sinusoidal
output of tach generators and one channel of analog strain gauge pressure to a digital
signal that can be used by aircraft display and/or control systems.
This installation contains two ST 32 units installed in the keel. See
Figure 5. Keel Mounted
LRUs
.
GTX 33H w/ES Transponder
The Garmin GTX 33H Mode S transponder is a radio transmitter and receiver that
operates on radar frequencies, receiving ground radar or TCAS interrogations at 1030
MHz and transmitting a coded response of pulses to ground-based radar on a frequency
of 1090 MHz. The GTX 33H is equipped with IDENT capability that activates the SPI pulse
for 18 seconds.
The GTX 33H replies to Mode A, Mode C, and Mode S interrogation. Mode A replies
consist of framing pulses and any one of 4,096 codes, which differ in the position and
number of pulses transmitted. Mode C replies include framing pulses and encoded
altitude. Mode S replies consist of any combination of the transponder’s permanent
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