# What is full scale deflection CDI?

## What is full scale deflection CDI?

CDI sensitivity refers to the scaling of the CDI deflection scale. There are three basic modes based on distance from the airport. In terminal mode, for example, a full scale deflection represents 1 nautical mile of cross-track error. In approach mode, the sensitivity on the CDI changes from 1 NM to 0.3 NM.

### What is full scale deflection on an ILS?

With this course width, a full-scale deflection shows when the aircraft is 2.5° to either side of the centerline. This sensitivity permits accurate orientation to the landing runway. With no more than one-quarter scale deflection maintained, the aircraft will be aligned with the runway.

What is a full scale deflection?

answered Apr 7 ’17 at 10:20. metacollin. 25.1k●4 ●54 ●103. Full scale deflection has its history in analogue meters where the moving needle could “deflect” and that deflection was proportional to what it measured i.e. Current, voltage or power.

What is half scale deflection?

If the CDI is half way between those two positions, it is at half scale deflection. If you count the edge of the centre circle as the first dot [which is normal] then half scale deflection is two and one half dots away from the exact centre of the scale.

## What is the difference between HSI and CDI?

Whereas a traditional CDI will only show your deviation to a given VOR radial, an HSI will show both your present heading and lateral position in relation to a VOR radial or GPS course line and doesn’t have the potential for reverse sensing.

### What is a 3/4 scale deflection CDI?

Recall an instrument rating practical test standard: A three-quarters scale or more CDI deflection is unacceptable. In VOR navigation, full deflection “indicates the aircraft is 12 degrees or more off course.” (To review: At 60 miles, a degree off course equals a mile off course.)

How do you calculate full scale deflection?

E = 0.001 A x (950 + 50) ohms E = 0.001 x 1000 = 1 volt for full-scale deflection. As noted above, RMeter can be determined by using a Digital Multimeter and making an Ohm Measurement across the meter terminals. The connected series resistance is the multiplier to give the desired full-scale voltage.

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How far off course is 1 degree?

Experts in air navigation have a rule of thumb known as the 1 in 60 rule. It states that for every 1 degree a plane veers off its course, it misses its target destination by 1 mile for every 60 miles you fly. This means that the further you travel, the further you are from your destination.

## What current is required for full scale deflection?

The necessary current for full scale deflection is 4mA for any galvanometer of resistance 99Ω.

### What is the typical full scale deflection current of a moving coil instrument?

Typical sensitivities for modern instruments range from 1 μA to 50 μA for full-scale deflection (FSD), although movements in the 100 μA to 1 mA range are preferred for their low cost and rugged nature where the higher current is not a problem.

What is full scale deflection current of galvanometer?

Full scale deflection for a galvanometer is 1mA.

How many radials does a VOR ground station provide?

The frequency range for a VOR is between 108.0 MHz and 117.95 MHz. Every VOR is oriented to magnetic north (more on this in a bit), and emits 360 radials from the station.

## How much CDI deflection is acceptable on a VOR?

Recall an instrument rating practical test standard : A three-quarters scale or more CDI deflection is unacceptable. In VOR navigation, full deflection “indicates the aircraft is 12 degrees or more off course.” (To review: At 60 miles, a degree off course equals a mile off course.) On most localizer courses, full deflection indicates 2.5 degrees.

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### How much CDI deflection is acceptable on a GPS?

Fortunately, training allowed a root navigation concept show the path out of danger: When the CDI became fully deflected, time was up for troubleshooting a glitchy GPS. Recall an instrument rating practical test standard : A three-quarters scale or more CDI deflection is unacceptable.

What is CDI deflection while descending on glide path?

While descending on the glide path, you need to have less than half-scale CDI deflection. Instrument landing system (ILS): An electronic system that provides both horizontal and vertical guidance to a specific runway, used to execute a precision instrument approach procedure.

How much deflection do you need for a gliding approach?

The answer, of course, is it depends on your flight director. Before you begin the approach you need to be on a segment of the approach or above the MSA. While descending on the glide path, you need to have less than half-scale CDI deflection.