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KEY OWNER/USER BENEFITS
Eyes-out-of-the-flight-deck operation enhances situational
awareness Conformal display of critical flight parameters increases
safety Category III guidance-to-touchdown guides the pilot through
the approach, flare and power reduction to wheels on the runway and roll out Precision touchdown capability maximizes landing performance Improves windshear awareness and avoidance through head-up
warnings and escape guidance Increases traffic awareness and avoidance with head-up TCAS
alerts Tailstrike alerts for take off and landing reduces chance
of aircraft damage Special unusual attitude symbology alerts the pilot and helps
the pilot return the aircraft to a normal attitude Software data loading and enhanced maintenance functions offer
improved maintainability Cat IIIa operations (50 feet DH, 600 RVR on Type III and qualifying
Type II facilities) Cat II operations (100 feet DH, 1200 RVR on Type I with dual
RVR) Enhanced Cat I operations (200 feet DH, 1600 RVR on qualifying
Type I with single RVR) 300 RVR LVTO Takeoff (Part 125 and 135) on qualifying runways
OVERVIEW
The Rockwell Collins Head-up Guidance System (HGS® )
provides enhanced situational awareness and energy management in all flight
conditions. The presentation of all primary flight data in the pilot's forward
field of view eliminates transitions from head-down to head-up flying. The
pilot views this critical information, focused at optical infinity, as conformal
with the outside world view. Using the displayed flight path and acceleration
information, it is possible for the pilot to fly very accurate approaches
to a precise landing in all conditions, even in turbulence, crosswinds and on
black hole approaches. Conformal display of flight path and acceleration allows the pilot to
precisely fly the aircraft in all phases of flight from takeoff through enroute
and into terminal area maneuvering to a precision landing with enhanced operational
safety. The HGS displays traffic alert and collision avoidance system (TCAS)
resolution advisories as an easy to follow a flight-path target. The HGS will
display special symbology if the aircraft enters an unusual attitude situation
that will help the pilot recognize this dangerous situation and return the aircraft
to a normal attitude. The HGS also includes pilot alerts for tailstrike and
windshear awareness and recovery. The HGS relies on a high-integrity computer architecture that collects
and evaluates critical flight data, such as attitude, airspeed, altitude and
the ILS inputs to compute guidance-to-touchdown information that can permit
high precision, low visibility landing and take off operations.
DESCRIPTION
Combiner
The Combiner presents the pilot a view, focused at optical infinity,
of a combination of displayed symbology and the outside real-world scene.
It has a special coating that only reflects the HUD image projected by the
overhead unit and is transparent for all other colors of visible light. The
Combiner is precisely installed in the aircraft so that the symbology is displayed
conformally so that the information accurately overlays the outside world.
A brightness control on the combiner allows the pilot to set the intensity of
the projected symbology. An automatic brightness control adjusts the display
relative to the ambient brightness without further pilot input.
Overhead Unit
The Overhead Unit (OHU) projects the symbology onto the combiner. It
contains the image source for the HUD image and a lens array that focuses
the HUD image at optical infinity when viewed by the pilot via the combiner.
This allows the pilot to focus vision well out in front of the airplane the
same as other aircraft, the runway and terrain.
Control Panel
The HGS Control Panel (HCP) is the pilot's control input to the HGS.
Using the HCP the pilot can enter runway information and can select the appropriate
HUD symbology set. For example, the pilot might select a symbology optimized
for flying an ILS approach or symbology appropriate for flying a visual approach
to a black hole runway.
On some aircraft the HGS can use the Multipurpose Control Display Unit
(MCDU) as the pilot interface to the HGS. When this option is selected, no
HCP is required.
Computer
The HGS computer interfaces with the systems and sensors on the aircraft
including air data, attitude/heading, navigation receivers and flight management
system, and generates the selected symbology set for display on the combiner.
The computer monitors both system and approach performance through the use
of extensive built-in-test (BIT). It is also field-loadable, allowing software
updates to be installed via the aircraft data loader.
HGS Annunciator Panel
The HGS Annunciator Panel (HAP) provides the monitoring pilot with annunciations
that confirm HGS system status and display mode. The panel includes alert
and warning lights that repeat the messages that the flying pilot sees on
the HGS display. On some aircraft this function is provided by the head-down
displays and the HAP is not needed.
OPERATION AND PERFORMANCE
The Head-up Guidance System gives flight crews the ability to fly an
extremely precise ILS approaches as well as the ability to safely fly a stable,
accurate flight path on a visual or non precision approach. The HGS can provide ILS approach guidance to allow the pilot to hand-fly
an ILS to a Category III landing (50 feet DH, 600 feet RVR), at a 1x10-9 level
of integrity (equivalent to an autoland or fly-by-wire system). The HGS can
also provide low-visibility takeoff guidance (LVTO) allowing takeoff in visibilities
as low as 300 ft. RVR on qualifying runways. In the US, the HGS can permit approved Category III operators to obtain
lower landing minima on Category II and on qualifying Category I runways.
FAA Order 8400.13B describes this procedure in detail. The HGS also includes symbology that assists the pilot in flying an
optimal escape from a windshear event and for righting the airplane in case
of an unusual attitude upset. AIII Mode at 90 Feet Tailstrike Avoidance Landing Windshear Alert
HGS SYSTEM CERTIFICATION
HGS Model | HGS 4000 | HGS
Safety Benefits | Yes | Approach Certification | Cat IIIa,
With Rollout Guidance | Enhanced
Cat I | Yes | 300 RVR LVTO | Yes | Windshear
Escape | Manual: Alpha Margin/Flight Path | LRU System Weight | 51 lb | Cert
Basis | Rockwell Collins STC |
TYPICAL SYSTEM
| | 1 | HGS Control Panel (HCP) | 1500-0500-002 | | | 1 | HGS Combiner | 1500-2310-001 | | | 1 | HGS Annunciator Panel (HAP) | 1500-2430-002 |
SPECIFICATIONS
Height | 198.5
mm (7.62 in) max | 273.05 mm (10.75 in) max | Width | 190.5 mm (7.5 in) max | 205.74 mm (8.1 in) max | Length | 386.1
mm (15.20 in) max | 384.8 mm (15.15 in) max | Weight | 8.2 kg (18 lb) | 10.5 kg (23 lb) |
Height | 66.80
mm (2.63 in) max | 329.44
mm (12.97 in) max | Width | 146.05 mm (5.75 in) max | 212.85 mm (8.38 in) max | Length | 173.22
mm (6.82 in) max | 116.33
mm (4.58 in) max | Weight | 1.35 kg (3 lb) | 3.2 kg (7 lb) |
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