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2. SOIA is an acronym for Simultaneous Offset
Instrument Approach, a procedure used to conduct
simultaneous approaches to runways spaced less than
3,000 feet, but at least 750 feet apart. The SOIA
procedure utilizes an ILS/PRM approach to one
runway and an offset Localizer Type Directional Aid
(LDA)/PRM approach with glide slope to the
adjacent runway.
(a) The ILS/PRM approach plates used in
SOIA operations are identical to other ILS/PRM
approach plates, with an additional note, which
provides the separation between the two runways
used for simultaneous approaches. The LDA/PRM
approach plate displays the required notations for
closely spaced approaches as well as depicting the
visual segment of the approach, and a note that
provides the separation between the two runways
used for simultaneous operations.
(b) Controllers monitor the SOIA ILS/PRM
and LDA/PRM approaches with a PRM system using
high update radar and high−resolution ATC radar
displays in exactly the same manner as is done for
ILS/PRM approaches. The procedures and system
requirements for SOIA ILS/PRM and LDA/PRM
approaches are identical with those used for
simultaneous close parallel ILS/PRM approaches
until near the LDA/PRM approach missed approach
point (MAP)−−−where visual acquisition of the ILS
aircraft by the LDA aircraft must be accomplished.
Since the ILS/PRM and LDA/PRM approaches are
identical except for the visual segment in the SOIA
concept, an understanding of the procedures for
conducting ILS/PRM approaches is essential before
conducting a SOIA ILS/PRM or LDA/PRM
operation.
(c) In SOIA, the approach course separation
(instead of the runway separation) meets established
close parallel approach criteria. Refer to FIG 5−4−19
for the generic SOIA approach geometry. A visual
segment of the LDA/PRM approach is established
between the LDA MAP and the runway threshold.
Aircraft transition in visual conditions from the LDA
course, beginning at the LDA MAP, to align with the
runway and can be stabilized by 500 feet above
ground level (AGL) on the extended runway
centerline. Aircraft will be “paired” in SOIA
operations, with the ILS aircraft ahead of the LDA
aircraft prior to the LDA aircraft reaching the LDA
MAP. A cloud ceiling for the approach is established
so that the LDA aircraft has nominally 30 seconds to
acquire the leading ILS aircraft prior to the LDA
aircraft reaching the LDA MAP. If visual acquisition
is not accomplished, a missed approach must be
executed.
b. Requirements.
Besides system requirements as identified in
subpara a above all pilots must have completed
special training before accepting a clearance to
conduct ILS/PRM or LDA/PRM Simultaneous Close
Parallel Approaches.
1. Pilot Training Requirement. Pilots must
complete special pilot training, as outlined below,
before accepting a clearance for a simultaneous close
parallel ILS/PRM or LDA/PRM approach.
(a) For operations under 14 CFR Parts 121,
129, and 135 pilots must comply with FAA approved
company training as identified in their Operations
Specifications. Training, at a minimum, must require
pilots to view the FAA video “ILS PRM AND SOIA
APPROACHES: INFORMATION FOR AIR CARRIER
PILOTS.” Refer to http://www.faa.gov/AVR/
AFS/PRMtraining/ for additional information and
to view or download the video.
(b) For operations under Part 91:
(1) Pilots operating transport category
aircraft must be familiar with PRM operations as
contained in this section of the Aeronautical
Information Manual (AIM). In addition, pilots
operating transport category aircraft must view the
FAA video “ILS PRM AND SOIA APPROACHES:
INFORMATION FOR AIR CARRIER PILOTS.”
Refer to http://www.faa.gov/AVR/AFS/PRM
training/ for additional information and to view or
download the video.
2/17/05 AIM
Arrival Procedures 5−4−37
FIG 5−4−19
SOIA Approach Geometry
NOTE−
SAP The SAP is a design point along the extended centerline of the intended landing runway on the
glide slope at 500 feet above the landing threshold. It is used to verify a sufficient distance is
provided for the visual maneuver after the missed approach point (MAP) to permit the pilots to
conform to approved, stabilized approach criteria.
MAP The point along the LDA where the course separation with the adjacent ILS reaches 3,000 feet.
The altitude of the glide slope at that point determines the approach minimum descent altitude
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