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IFR Study > ILS > Flashcards

ILS Flashcards

1
Q

What information does the ILS provide?

A
  1. Guidance: Localizer, Glide Slope
  2. Range (Distance): OM/MM/IM, DME, GPS fix during approaches
  3. Visual Information: Approach lights (not a part of the ILS), touchdown centerline lights, runway lights etc.
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2
Q

What means can be a substitute for the OM?

A
  • Compass locator
  • PAR
  • ASR
  • VOR
  • NDB
  • RNAV GPS capable of identifying fixes on a SIAP
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3
Q

What is a full scale deflection at the runway threshold for an ILS?

A

-700’

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4
Q

How far out does the localizer provide guidance (i.e. SSV LOC)?

A
  • 18 NM out @ 10° / 1,000’ above highest terrain along course line / 10° along either side of the course
  • 10 NM radius 10° to 35° / 4,500’ above the elevation of the antenna site /
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5
Q

What is a localizer with an ESV?

A
  • It’s a LOC that can extend beyond the SSV of 18NM of a standard localizer distance
  • It can be extended beyond the standard 18 NM with the approval of FAA inspections
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6
Q

What is an LDA?

A
  • Localizer Directional Aid
  • Not a part of a complete ILS.
  • LDA is NOT aligned with the runway
  • Can have GS; indicated as “LDA/Glideslope” aka APV
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7
Q

What is an APV?

A
  • An approach with vertical guidance
  • Based on Nav. system that is not required to meet ICAO Annex 10
  • Provides course & glidepath deviation information
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8
Q

Can you use a glideslope when shooting the back course of an ILS?

A
  • Not unless specified on the approach and landing chart
  • You may receive GS flag to disappear and present an unreliable GS info
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9
Q

How wide is the GS beam?

A
  • 1.4° vertically
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10
Q

How far can you follow the GS when shooting the ILS?

A
  • The signal provides descent info. for navigation down to the lowest authorized DH specified in the approved ILS IAP
  • Any reference below the lowest DH must be supplemented by visual reference to the runway
  • GS with no published DH are usable to runway threshold
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11
Q

How far down can you utilize the GS if there’s no published DA?

A

All the way down to runway threshold

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12
Q

The GS projection angle is normally adjusted to 3° horizontal in order to:

A
  • Intersect with the MM at about 200’ and the outer marker at 1,400’ above the runway elevation
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13
Q

How far out can the GS signal be reached?

A
  • 10NM
  • There are ESV for GS that exceed 10 NM
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14
Q

What is the size of a marker beacon when directly above the antena?

A
  • 1,000’ above the antenna
  • 2,400’ wide
  • 4,200’ long
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15
Q

What does the MM and OM help identify during the approach?

A
  • OM identifies the FAF
  • MM identifies the a position of 3,500’ from the landing threshold (if following the GS you should be 200’ above the elevation of TDZE)
  • No MM are required to be installed with ILS
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16
Q

What color is the OM on the annunciators?

A
  • Blue
  • Identified with “dash dash dash”
17
Q

What color is the MM on the annunciators?

A
  • Amber
  • Identified with “dot dash dot dash”
18
Q

What color is the IM when installed on the ILS?

A
  • White
  • Identified with “dot dot dot dot”
19
Q

What frequencies are ILS on?

A
  • 108.1 through 111.75
  • Every odd tenth, and 5th one (108.1/108.15/108.3/108.35 etc
20
Q

When the ILS GS fails, what minimums can you use?

A
  • Use the minimums published for localizer only approach
  • If ever in doubt go missed
21
Q

What is the minimum for an ILS Cat I required visuals?

A
  • DH 200’ and RVR of 2,400’
  • w/ TDZE and Centerline lights RVR 1,800’
  • w/ Autopilot or FD, HUD: RVR 1,800’
22
Q

What are Cat II ILS minimums?

A
  • DH 100’, and RVR 1,200’ w/ autoland or HUD to touchdown and noted on authorization
23
Q

What are Cat IIIa ILS minimums?

A
  • No DH or DH below 100’ and RVR no less than 700’
24
Q

What are Cat IIIb ILS minimums?

A
  • No DH or DH below 50’ and RVR less than that 750 but no less than 150
25
Q

What are Cat IIIc minimums?

A
  • No DH and no RVR limitation
26
Q

With your IFR license, what Cat approaches are you able to shoot?

A
  • Only Cat I approaches
  • Additional training required for shooting Cat II and Cat III approaches
27
Q

When may ATC allow an a/c to enter the ILS critical area?

A

When the landing a/c has:

  • Runway in sight
  • Circling to land
  • Sides-stepping to land on another runway
28
Q

When is no ILS critical area protected for landing traffic?

A
  • When weather conditions are at or above ceiling 800’
    and/or
  • Flight visibility is less than 2 miles
  • Under these conditions, flight crew would advise tower that it will conduct an AUTOLAND or COUPLED approach
29
Q

What is SDF?

A
  • Simplified Directional Facility
  • Similar to ILS but not aligned with the runway
  • No GS information
  • Course may be wider, so less precision
30
Q

The angle of the transmission signal of the LOC frequency is dependent on what?

A
  • It varies with the length of the runway
  • This is to keep the standard width of the approach course at 700’ at the runway threshold

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