ESV

Question 1

What is service volume?

Answer 1

The volume of airspace surrounding a NAVAID within which a signal of usable strength exists and where that signal is not operationally limited by co-channel interference.

Question 2

What is Standard Service Volume (SSV)?

Answer 2

That volume of airspace defined by the national standard.

Question 3

What is the Flight Inspection Standard Servce Volume?

Answer 3

The service area which must always be provided given the facility type.

Question 4

What is operational service volume?

Answer 4

The total airspace available for operational use.

Question 5

What types of volume are included in the operational service volume?

Answer 5

SSV, excluding any restricted areas, and ESV (the usable area outside the SSV that is requested through the frequency management office).

Question 6

Can flight inspection approve an ESV without the approval of the FMO (frequency management office)?

Answer 6

HELLZ NAHHH.

Question 7

When are expanded service volumes required?

Answer 7

They are required when procedural use is predicated on a NAVAID’s performance outside of the SSV.

Question 8

How many transmitters do ESVs need to be evaluated on?

Answer 8

1

Question 9

Can an ESV be reevaluated by orbital means?

Answer 9

Yes, it can be evaluated at the ESV distance, at the lowest approved altitude, and should encompass the allowable radial misalignment or applicable fix displacement area.

Question 10

What must be accomplished if a fix is located beyond the FISSV of a facility but within the SSV of the facility?

Answer 10

A fix displacement coverage evaluation must be accomplished for that facility.

Question 11

When evaluating a fix displacement area, how far either side of course do we evaluate the primary facility at the crossing fix?

Answer 11

+/- 4 NM or 4.5 degrees of the primary radial, whichever is greater.

Question 12

When evaluating fix displacement area, how far either side of course do we evaluate the facility providing the crossing radial? If it’s an NDB? If the crossing radial can also be the primary facility?

Answer 12

+/- 3.6 degrees; +/- 5 degrees; +/- 4 nm or 4.5 degrees whichever is greater.

Question 13

How do we evaluate fix displacement coverage for stand-alone DME fixes?

Answer 13

These fixes are evaluated for coverage +/-4nm or 4.5 degrees (whichever is greater) at 5nm greater than the fix distance.

Question 14

What must be done if a standalone DME fix is located within 5 nm of the edge of the FISSV?

Answer 14

You must check coverage beyond the FISSV to a point 5nm beyond the fix and +/- 4nm or 4.5 degrees (whichever is greater).

Question 15

At what distance does 4.5 degrees equal 4 nm each side of centerline?

Answer 15

50.8 DME.

Question 16

What is the service volume of a localizer?

Answer 16

35 degrees either side of centerline out to 10nm, and 10 degrees either side of centerline out to 18nm.

Question 17

How do we evaluate a localizer ESV?

Answer 17

Reduce power to RF monitor reference values and then:

• Fly a 10-10 degree arc across the localizer course at the ESV distance and the highest ESV altitude.
• Fly a 10-10 degree arc across the localizer course at the ESV distance and the lowest ESV altitude.
• Proceed on course, inbound, from the ESV distance to 18nm (25nm for ICAO Service Volumes) from the localizer antenna at the lowest altitude.

Question 18

After checking an ESV in RF Power Monitor reference mode, is there any requirement to check it in normal?

Answer 18

No.

Question 19

What is the SSV for a glideslope?

Answer 19

8 degrees either side of centerline out to 10nm (17nm ICAO).

Question 20

What are the upper and lower limits of the glideslope SSV?

Answer 20

Upper limit = 1.75 x GS angle; Lower limit = .45 x GS angle.

Question 21

How do we fly a glideslope ESV?

Answer 21

Reduce RF power and then:

• Fly at an altitude .45 times the commissioned angle at the ESV distance and on the localizer course until reaching the clearance above path
• Fly at an altitude .45 times the commissioned angle at the ESV distance and 8 degrees LEFT of course until reaching the clearance above path
• Fly at an altitude .45 times the commissioned angle at the ESV distance and 8 degrees LEFT of course until reaching the clearance above path
• Fly on path from the ESV distance throughout Zone-1.

Question 22

How do we evaluate NDB ESVs?

Answer 22

Fly intended routes or transitions at the minimum altitudes and maximum distances as depicted in the flight procedure document. Do the check on normal power and only need to evaluate on one transmitter.

Question 23

When inspecting an RNAV DME/DME ESV and a facility designated as “Critical” is off the air, what should we do?

Answer 23

The inspection must be terminated until the facility is back in service.

Question 24

What is ESV??

Answer 24

The usable area outside the SSV that is sometimes requested through the FMO.

Question 25

True or False? You may approve ESV’s to any distance the FICO requests?

Answer 25

False, flight inspection does not approve any part of an ESV beyond that which is approved by the FMO (now Technical Operations?)!

Question 26

Can orbital flight be used to re validate an ESV?

Answer 26

Yes.

Question 27

True of False. There is no need to check the upper limits on a localizer ESV?

Answer 27

False, ILS ESVs require the upper limits to be validated.

Question 28

Does a localizer require a normal power check in Zone 1 for structure during an ESV validation?

Answer 28

No

The inbound run checked in the reduced RF condition may also be used for localizer Zone 1 structure analysis.

Question 29

On a dual frequency l9ocalizer, how are the transmitters configured for an ESV check?

Answer 29

Both course and clearance transmitters are at RF power monitor reference values.