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not assign altitudes lower than the minimum
vectoring altitude. Pilots should notify ATC
immediately if there is a degradation of aircraft or
navigation systems.
17.4 Strict radio discipline is mandatory during
parallel ILS/MLS approach operations. This includes
an alert listening watch and the avoidance of lengthy,
unnecessary radio transmissions. Attention must be
given to proper call sign usage to prevent the
inadvertent execution of clearances intended for
another aircraft. Use of abbreviated call signs must be
avoided to preclude confusion of aircraft with similar
sounding call signs. Pilots must be alert to unusually
long periods of silence or any unusual background
sounds in their radio receiver. A stuck microphone
may block the issuance of ATC instructions by the
final monitor controller during simultaneous parallel
ILS/MLS and simultaneous close parallel ILS PRM
approaches. For additional communications information,
pilots should refer to GEN 3.4, paragraph 4.4,
Radio Communications Phraseology and
Techniques.
17.5 Use of Traffic Collision Avoidance Systems
(TCAS) provides an additional element of safety to
parallel approach operations. Pilots should follow
recommended TCAS operating procedures presented
in approved flight manuals, original equipment
manufacturer recommendations, professional newsletters,
and FAA publications.
31 JULY 08
AIP ENR 1.5−43
United States of America 15 MAR 07
Federal Aviation Administration Nineteenth Edition
FIG ENR 1.5−25
Parallel ILS Approaches
31 JULY 08
ENR 1.5−44 AIP
15 MAR 07 United States of America
Nineteenth Edition Federal Aviation Administration
FIG ENR 1.5−26
Staggered ILS Approaches
DIAGONAL
SEPARATION
Parallel ILS Approaches
Runway centerlines spaced 2500’ or greater.
Radar monitoring not required.
Staggered Approaches.
18. Parallel ILS/MLS Approaches
(Dependent) (See FIG ENR 1.5−26)
18.1 Parallel approaches are an ATC procedure
permitting parallel ILS/MLS approaches to airports
having parallel runways separated by at least
2,500 feet between centerlines. Integral parts of a
total system are ILS/MLS, radar, communications,
ATC procedures, and required airborne equipment.
18.2 A parallel (dependent) approach differs from a
simultaneous (independent) approach in that, the
minimum distance between parallel runway centerlines
is reduced; there is no requirement for radar
monitoring or advisories; and a staggered separation
of aircraft on the adjacent localizer/azimuth course is
required.
18.3 Aircraft are afforded a minimum of 1.5 miles
radar separation diagonally between successive
aircraft on the adjacent localizer/azimuth course
when runway centerlines are at least 2,500 feet but no
more than 4,300 feet apart. When runway centerlines
are more than 4,300 feet but no more than 9,000 feet
apart, a minimum of 2 miles diagonal radar separation
is provided. Aircraft on the same localizer/azimuth
course within 10 miles of the runway end are
provided a minimum of 2.5 miles radar separation. In
addition, a minimum of 1,000 feet vertical or a
minimum of three miles radar separation is provided
between aircraft during turn on to the parallel final
approach course.
31 JULY 08
AIP ENR 1.5−45
United States of America 15 MAR 07
Federal Aviation Administration Nineteenth Edition
FIG ENR 1.5−27
Simultaneous Parallel ILS Approaches
NO TRANSGRESSION ZONE
2200’
2200’
2200’
2200’
OM
OM
INTERCEPT GLIDE
SLOPE AT 2200’
3200’
3200’
EXTEND RADAR MONITORING AND NTZ TO 7NM BEYOND RUNWAY
DEPARTURE END FOR QUADRUPLE SIMULTANEOUS ILS APPROACHES.
7NM
14L
14R
RADAR MONITORING
PROVIDED TO
ENSURE SEPARATION
BETWEEN AIRCRAFT ON
PARALLEL LOCALIZERS.
AIRCRAFT MAY BE
VECTORED TO EITHER
14L OR 14R ILS
FROM OUTER FIX.
MEADOWVIEW INT (NW COURSE OHA ILS &
OBK VOR R-227) ESTABLISHED WHERE
3200’ ALTITUDE INTERCEPTS GLIDE SLOPE.
RADAR MONITORING PROVIDED TO ENSURE SEPARATION
BETWEEN AIRCRAFT ON PARALLEL LOCALIZERS. WHEN GLIDE
SLOPE INOPERATIVE BEGIN DESCENT AT MEADOW INTERSECTION.
(RUNWAY CENTERLINES SPACED 4300’ OR MORE [DUAL RUNWAYS]
OR 5000’ OR MORE, [TRIPLE OR QUADRUPLE RUNWAYS] - RADAR MONITORING REQUIRED)
18.4 Whenever parallel ILS/MLS approaches are in
progress, pilots are informed that approaches to both
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