Hsi Aircraft - A slaving meter is located in the upper right hand corner of the instrument face on enslaved models. If equipped with a slaving feature, an HSI will automatically "update" its compass card with the magnetic compass to correct for
precession. The meter needle will oscillate slowly when the compass card is properly aligned with the magnetic compass. We have been very impressed with this device but many buyers are disappointed to learn that beyond the $9495 price for the Sandel itself, they will have to purchase and integrate other components to complete the package.
Hsi Aircraft
This can easily double the cost of the typical installation. The panel display, the KI525A, is a familiar face with a rugged look and feel. The 7-inch deep HSI display features yellow dual glideslope pointers on the left and right side of the display, which only come into view during a valid glideslope condition.
What Is The Difference Between Hsi And Cdi?
In fact, we have heard comments from some pilots that after many hours of flying, they still can't get used to having the heading select knob on the left side. Picky, picky, picky. But reaching through the center of the control yoke on some airplanes to get to the heading bug is somewhat awkward.
This yellow wedge relates the vertical glide path centerline to the aircraft's position. The aircraft is "on glide slope", when the wedge covers the horizontal index. Each dot on this vertical scale represents approximately four-tenths degrees vertical deviation from the centerline.
Installation hardware is, of course, Bendix/King traditional; High quality and very reliable, thanks to years in the field. If your plans include interface with a Century or Cessna/Sperry autopilot system, expect additional expense as your shop gets technical and describes the required autopilot adapter you'll need to buy.
The Sandel makes perfect sense in a Malibu or Saratoga, less so in an Archer or older Bonanza, unless you're sure you'll want to display external nav, traffic or storm information on your HSI, there might be better map choices.
What Is The Difference Between A Standard Vor And Hsi?
Sandel pro: Lots of room to upgrade. Sandel con: Like wearing a tux to a tractor pull. The quality of the SN3308 has been excellent and product support continues to be first rate. The technical support engineers at Sandel are helpful and troubleshooting over the phone seems to work every time;
they clearly know this box inside and out. Like the entire line of Century HSIs, the NSD360A has an easy-to-interpret display. The course pointer is bright yellow, nav flags are red and white candy stripes with a yellow heading bug.
And the autopilot heading command will interface with most autopilots without the need for adapters. A standalone CDI (Course Deviation Indicator) is an instrument that shows your deviation from a VOR radial that is selected using the OBS (Omnibearing Selector) knob located on the instrument itself.
An HSI (Horizontal Situation Indicator) is an entirely separate instrument that combines a CDI and a heading indicator. Unlike conventional flux valve systems, which detect only the horizontal component of the Earth's magnetic field, the GMU 11 magnetometer provides full 3-axis vector measurements for the most precise digital indication of magnetic field strength and direction.
How Does An Aircraft Hsi Work?
Rock-solid Attitude Reference When configured as a primary attitude indicator, G5 uses solid-state AHRS reference to provide smooth, steady and reliable horizon-based pitch and roll indications. In addition to aircraft attitude, G5 will also support display of airspeed, altitude, vertical speed, slip/skid, turn rate, configurable V-speed references, barometric setting and selected altitude — as well as visual alerts upon arriving at a preselected altitude.
A built-in GPS receiver provides highly accurate ground speed and ground track readouts. Plus, a dedicated rotary knob on the unit allows for easy adjustments to altitude bugs and barometric pressure settings. This card, located beneath the lubber line, indicates the aircraft's current
heading. The card is mechanically coupled to the compass card set knob and, at the start of each flight, must be set by the pilot to agree with the magnetic compass heading. As the flight progresses and headings change, the direction
gyro rotates the card to indicate the current heading. As with any standard unslaved DG, some gyro precession will occur. Therefore, it is necessary to check and reset the compass card at periodic intervals. The selected heading is marked by an orange heading bug which can be moved to
What Information Does The Hsi Provide?
any point about the perimeter of the compass card. As the aircraft's heading changes, the bug rotates with the compass card, thus alerting the pilot to the difference between the selected heading (located under the bug) and the actual one
aircraft heading. The heading bug may also be coupled to an autopilot or flight director system. When coupled, "off heading" signals will be generated causing the autopilot to fly the aircraft so as to maintain the selected heading.
On a conventional VOR indicator, left-right and to-from must be interpreted in the context of the selected course. When an HSI is tuned to a VOR station, left and right always mean left and right and TO/FROM is indicated by a simple triangular arrowhead pointing to the VOR.
Gain A Clearer Sense Of Direction To provide even more situational awareness, G5 is also approved for installation as a replacement heading indicator/directional gyro (HI or DG) or horizontal situation indicator (HSI) in your panel. When paired with an affordable GMU 11 magnetometer, GAD™ 29 navigation data interface and select VHF Nav/Comms or GPS navigators, G5 can serve as your primary reference source for magnetic heading, VOR/LOC guidance and/or GPS course guidance — as well
How Does A Cdi Work Aviation?
as providing distance and ground speed indications. The unit displays both vertical and lateral GPS/VOR/LOC course deviation when available. And you can use the G5 instrument's rotary knob to easily make and adjust course selections — or to control heading bug settings in DG installations.
For added system integration, a single magnetometer can supply heading information to 2 G5 units simultaneously. Additionally, G5 can provide heading output to select third-party autopilots (with GAD 29B). Get your shop to pencil out the price difference between a slaved and non-slaved system.
Don't be surprised if the price delta is significant - as much as 15 percent. We think it's worth it, however, because if you're fooling around chasing a progressing gyro in the clouds, you lose the HSIs considerable advantage as a workload reducer.
The HSI works by combining a VOR/DME receiver and an electrically-slaved heading indicator. (Not all HSIs are slaved but the HSIs in the Flight Simulator aircraft are.) The heading indicator shows the aircraft's magnetic heading and its green pointer shows the course the pilot has selected.
How Do You Read Hsi Aviation?
While flagged in this mode, the system can be operated non-slaved, like an ordinary directional gyro. Clearly, operation of any HSI system with faulty slaving information can be hazardous; This warning system helps avoid that. The Horizontal Situation Indicator (HSI) is the panel mounted cockpit indicator that provides a comprehensive display including usually at least heading, course, and glide scope.
The heading indicator of the HSI is a remote indicating compass that gets its information from a remote slaving transmitter. Century Flight Systems Century has nailed the market for as long as we can remember with its popular NSD360A series HSI.
This model has a self-contained vacuum-driven gyro that has proven reliable in the field, subject to the vagaries of the basic vacuum system which are, admittedly, considerable. HSIs combine the directional gyro, nav indicator and glideslope indication on one instrument so they both reduce workload by centralizing the scan and they make it much easier to interpret the aircraft position relative to a selected course.
What's more, because it's an all solid-state design, GMU 11 offers low power consumption as well as easy installation and calibration. On most aircraft, GMU 11 is mounted in a separate remote location from the ADAHRS and other electronics — typically outboard in the wing, tail section or vertical stabilizer — to minimize any external magnetic interference.
What Is Cdi And Obs?
If you prefer an electrically driven slaved system, we think its a draw between the Bendix/King and S-TEC systems. The Bendix/King seems easier to service in the field with more borrowers available due to its large population.
But S-TEC/Meggitt may be the real comer in the electromechanical HSI market. And if youre not sure about any of this, patience, patience, patience. As more competition emerges, the prices on EHSIs may decline. Or, the emerging primary flight display technology might render HSIs obsolete.
Were not at that point yet, but with new product development coming fast and furious, we could soon be. This system is available in both slaved and non-slaved configurations. The non-slaved unit is quite straightforward, requiring no remote components at all.
In fact, except for the electrical connections to the nav system, a non-slaved NSD isnt any more involved to install than a plane-Jane vacuum DG. For more than five decades, active and dedicated aircraft owners and pilots have turned to AVIATION CONSUMER to answer their most important buying questions.
What Is Obi Aviation?
This website contains many older reviews. Unless otherwise noted, these reviews carry product pricing from the time of the original review. The HSI also contains the autopilot and/or flight director heading command control-the heading bug. For aircraft not equipped with an autopilot-and most aircraft equipped with an HSI usually have one-the bug is still there and can serve as a shorthand reminder for an assigned heading.
Combining the directional gyro and the NAV indicator into one instrument reduces pilot workload by providing heading, course reference, course deviation and glide slope information - all in one visual aid. In addition, an HSI makes
it easier to visualize the aircraft's position with reference to the selected course or holding patterns. The "split needle" presentation made up of the course and reciprocal pointers and the VOR/LOC deviation indicators, clearly shows both selected course and course deviation.
The KA52 and KA57 autopilot adapter modules are behind-the-scenes happy boxes that turn heading output signals from the HSI into proper signals required by some autopilots other than Bendix/King. Century Flight Systems also manufactures such adapters for some interfaces with their systems.
How Do You Use An Hsi?
A course deviation indicator (CDI) is an avionics instrument used in aircraft navigation to determine an aircraft's lateral position in relation to a course to or from a radio navigation beacon. If the location of the aircraft is to the left of this course, the needle deflects to the right, and vice versa.
The S-TEC system seems to have been overshadowed by the Bendix/King products because Bendix/King had such a lock on the OEM market. Now that S-TEC has gained market share in autopilots, the ST180 is gaining favor, too. The ST180 has an all-electric remotely mounted slaved gyro that looks similar in appearance to the Bendix/King KG102A gyro, as does the remote flux detector.
and slaving accessory in comparison. (Prices quoted include the remote gyro, by the way.) Average overhaul of the NSD360A instrument/gyro is in the $2000 range and this costly routine maintenance ritual sometimes disappoints owners. But its cheaper to overhaul than the Bendix/King unit and cheaper to install.
Well admit, were not crazy about installing new instrument requiring vacuum but you probably already have a pump anyway and perhaps a vacuum back-up, so these instruments still have their place in the panel. Reliability of the gyro and other system components has been excellent.
How Does A Vor Work?
This system is generally standard in new aircraft that have an S-TEC System 55 autopilot and it needs no autopilot adapter to work with the S-TEC stuff. Pricewise, expect the installation to be similar if not a bit cheaper than a Bendix/King KCS55A.
In the HSI instrument, the TO/FROM indicator (yellow triangle) always points towards the VOR direction. The course radial indicator (black arrow) represents the radial direction from the VOR. The course deviation bar (red) is located exactly in function of the aircraft heading.
Other components include the KMT112 magnetic flux detector and KA51B slaving control/compensator unit that is mounted on the instrument panel and provides the pilot with options for free gyro mode, which eliminates the slaving operation. It also contains a slaving meter which indicates proper operation or any slaving errors.
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