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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.
REFERENCE−
AIM, Chapter 4, Section 2, Radio Communications Phraseology and
Techniques, gives additional communications information.
e. 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.
8/5/04 AIM
Arrival Procedures 5−4−31
FIG 5−4−15
Parallel ILS Approaches
AIM 8/5/04
5−4−32 Arrival Procedures
5−4−14. Parallel ILS/MLS Approaches (Dependent)
(See FIG 5−4−16.)
FIG 5−4−16
Staggered ILS Approaches
DIAGONAL
SEPARATION
Parallel ILS Approaches
Runway centerlines spaced 2500’ or greater.
Radar monitoring not required.
Staggered Approaches.
a. 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.
b. 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.
c. 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.
d. Whenever parallel ILS/MLS approaches are in
progress, pilots are informed that approaches to both
runways are in use. In addition, the radar controller
will have the interphone capability of communicating
with the tower controller where separation responsibility
has not been delegated to the tower.
8/5/04 AIM
Arrival Procedures 5−4−33
5−4−15. Simultaneous Parallel ILS/MLS Approaches (Independent)
(See FIG 5−4−17.)
FIG 5−4−17
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)
a. System. An approach system permitting simultaneous
ILS/MLS approaches to parallel runways
with centerlines separated by 4,300 to 9,000 feet, and
equipped with final monitor controllers. Simultaneous
parallel ILS/MLS approaches require radar
monitoring to ensure separation between aircraft on
the adjacent parallel approach course. Aircraft
position is tracked by final monitor controllers who
will issue instructions to aircraft observed deviating
from the assigned localizer course. Staggered radar
separation procedures are not utilized. Integral parts
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