AIM

4/3/14

5−4−43

Arrival Procedures

(2)

the ILS PRM and/or LDA PRM ap-

proach in a Simultaneous Offset Instrument

Approach (SOIA) operation.

(c)

The pilot may request to fly the RNAV or

GLS PRM approach in lieu of either the ILS PRM and

LDA PRM approaches. ATIS may advertise RNAV

or GLS PRM approaches to the effected runway or

runways in the event of the loss of ground based

NAVAIDS. The Attention All Users Page will ad-

dress ILS PRM, LDA PRM, and RNAV PRM or GLS

PRM approaches as applicable. In the remainder of

this section;

(1)

The RNAV or GLS PRM approaches

may be substituted when reference is made to an ILS,

LOC or SOIA offset LDA PRM approach.

(2)

The RNAV or GLS PRM Missed Ap-

proach Point (MAP) in SOIA operations may be

substituted when reference is made to the LDA PRM

MAP.

2.

Flight Management System (FMC) coding of

a SOIA offset RNAV or GLS approach is different

than other RNAV and GLS approach coding. The

charted MAP and the FMC coded MAP (fictitious

threshold waypoint (FTP) are not collocated. The

FTP is designated in the approach coding as the MAP

so that vertical guidance is available to the runway

threshold, as does the LDA glideslope. This vertical

guidance may be utilized for situational awareness in

the visual segment of the approach, between the

charted MAP and runway threshold.

As a result of coding the FTP as the MAP, a heading

must initially be flown, either by hand or autopilot

“heading mode,” before engaging LNAV when ex-

ecuting a missed approach at or past the charted MAP.

Notes on the charted IAP and in the Attention All

Users Page (AAUP) make specific reference to this

procedure.

The charted MAP is coded as a stepdown fix in the

FMC approach coding because the FTP WP is coded

as the MAP. Some FMCs will not display stepdown

fixes inside the FAF. For those FMCs, the charted

MAP will not appear when the approach is line selec-

ted from the FMC. Use the distance from the FTP as

shown on the charted IAP, or other approved method,

to identify the location of the charted MAP.

Because the offset RNAV or GLS approach FTP is

coded as the MAP, the FMC map display will depict

the initial missed approach course as beginning at the

FTP. This depiction will not match the initial missed

approach procedure depiction as charted on the IAP.

Pilots are reminded that charted IAP guidance is to be

followed, not the map display. When commencing a

missed approach or go-around, after the aircraft com-

pletes the initial charted missed approach turn, the

remainder of the procedure coding is standard and

can be navigated as with any other IAP.

NOTE

−

All simultaneous independent approaches to runways or
approach courses less than 4,300 feet apart are categor-
ized as simultaneous close parallel and include PRM in the
approach name. Between 4,299 feet and 3,600 feet runway
spacing, PRM or other high update rate surveillance sys-
tem to monitor the NTZ is not required.

(a)

Simultaneous close parallel ILS PRM ap-

proaches are depicted on a separate Approach

Procedure Chart titled ILS PRM Rwy XXX (Simul-

taneous Close Parallel).
SOIA is an acronym for Simultaneous Offset Instru-

ment Approach, a procedure used to conduct

simultaneous approaches to runways spaced less than

3,000 feet, but at least 750 feet apart. The SOIA pro-

cedure utilizes an ILS PRM approach to one runway

and an offset Localizer Type Directional Aid (LDA)

PRM approach with glide slope to the adjacent run-

way. In SOIA operations, aircraft are paired, with the

aircraft conducting the ILS PRM approach always

positioned slightly ahead of the aircraft conducting

the LDA PRM approach.

(b)

The ILS PRM approach plates used in

SOIA operations are identical to other ILS PRM ap-

proach 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.

(c)

When course centerline spacing is less

than 3600 feet but at least 3000 feet, controllers mon-

itor 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 acquis-