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(b) The MM indicates a position approximately
3,500 feet from the landing threshold. This is
also the position where an aircraft on the glide path
will be at an altitude of approximately 200 feet above
the elevation of the touchdown zone.
(c) The IM will indicate a point at which an
aircraft is at a designated decision height (DH) on the
glide path between the MM and landing threshold.
TBL 1−1−3
Marker Passage Indications
Marker Code Light
OM BLUE
MM AMBER
IM WHITE
BC WHITE
3. A back course marker normally indicates the
ILS back course final approach fix where approach
descent is commenced.
AIM 8/5/04
1−1−10 Air Navigation Aids
g. Compass Locator
1. Compass locator transmitters are often
situated at the MM and OM sites. The transmitters
have a power of less than 25 watts, a range of at least
15 miles and operate between 190 and 535 kHz. At
some locations, higher powered radio beacons, up to
400 watts, are used as OM compass locators. These
generally carry Transcribed Weather Broadcast
(TWEB) information.
2. Compass locators transmit two letter identification
groups. The outer locator transmits the first
two letters of the localizer identification group, and
the middle locator transmits the last two letters of the
localizer identification group.
h. ILS Frequency (See TBL 1−1−4.)
TBL 1−1−4
Frequency Pairs Allocated for ILS
Localizer MHz Glide Slope
108.10 334.70
108.15 334.55
108.3 334.10
108.35 333.95
108.5 329.90
108.55 329.75
108.7 330.50
108.75 330.35
108.9 329.30
108.95 329.15
109.1 331.40
109.15 331.25
109.3 332.00
109.35 331.85
109.50 332.60
109.55 332.45
109.70 333.20
109.75 333.05
109.90 333.80
109.95 333.65
110.1 334.40
110.15 334.25
110.3 335.00
110.35 334.85
110.5 329.60
110.55 329.45
110.70 330.20
110.75 330.05
110.90 330.80
110.95 330.65
Localizer MHz Glide Slope
111.10 331.70
111.15 331.55
111.30 332.30
111.35 332.15
111.50 332.9
111.55 332.75
111.70 333.5
111.75 333.35
111.90 331.1
111.95 330.95
i. ILS Minimums
1. The lowest authorized ILS minimums, with
all required ground and airborne systems components
operative, are:
(a) Category I. Decision Height (DH)
200 feet and Runway Visual Range (RVR) 2,400 feet
(with touchdown zone and centerline lighting, RVR
1,800 feet);
(b) Category II. DH 100 feet and RVR
1,200 feet;
(c) Category IIIa. No DH or DH below
100 feet and RVR not less than 700 feet;
(d) Category IIIb. No DH or DH below
50 feet and RVR less than 700 feet but not less than
150 feet; and
(e) Category IIIc. No DH and no RVR
limitation.
NOTE−
Special authorization and equipment required for
Categories II and III.
j. Inoperative ILS Components
1. Inoperative localizer. When the localizer
fails, an ILS approach is not authorized.
2. Inoperative glide slope. When the glide
slope fails, the ILS reverts to a nonprecision localizer
approach.
REFERENCE−
See the inoperative component table in the U.S. Government Terminal
Procedures Publication (TPP), for adjustments to minimums due to
inoperative airborne or ground system equipment.
k. ILS Course Distortion
1. All pilots should be aware that disturbances to
ILS localizer and glide slope courses may occur when
surface vehicles or aircraft are operated near the
localizer or glide slope antennas. Most ILS
installations are subject to signal interference by
8/5/04 AIM
Air Navigation Aids 1−1−11
either surface vehicles, aircraft or both. ILS
CRITICAL AREAS are established near each
localizer and glide slope antenna.
2. ATC issues control instructions to avoid
interfering operations within ILS critical areas at
controlled airports during the hours the Airport
Traffic Control Tower (ATCT) is in operation as
follows:
(a) Weather Conditions. Less than ceiling
800 feet and/or visibility 2 miles.
(1) Localizer Critical Area. Except for
aircraft that land, exit a runway, depart or miss
approach, vehicles and aircraft are not authorized in
or over the critical area when an arriving aircraft is
between the ILS final approach fix and the airport.
Additionally, when the ceiling is less than 200 feet
and/or the visibility is RVR 2,000 or less, vehicle and
aircraft operations in or over the area are not
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