AIM

4/3/14

5−4−39

Arrival Procedures

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14. Parallel ILS/MLS Approaches (Dependent)

(See FIG 5−4−20.)

FIG 5

−4−20

Staggered Approaches

a.

Parallel approaches are an ATC procedure

permitting approaches to airports having parallel

runway centerlines separated by between 2,500 feet

and 9,000 feet. Integral parts of a total system are ILS,

radar, communications, ATC procedures, and

required airborne equipment. RNAV or GLS

equipment may replace the required airborne ILS

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 final course is

required.

c.

A minimum of 1.5 NM radar separation

(diagonal) is required between successive aircraft on

the adjacent final approach 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 approaches are in progress,

pilots are informed that approaches to both runways

are in use. The charted IAP also notes which runways

may be used simultaneously. 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.