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U.S. DEPARTMENT OF TRANSPORTATION ORDER FEDERAL AVIATION ADMINISTRATION JO 7110.121A National Policy Effective Date: March 20, 2019 SUBJ: Precision Runway Monitor-Alternative (PRM-A) Multilateration (MLAT) data for surveillance at Detroit TRACON (021) 1. Purpose of This Order. This order prescribes guidance for the use of PRM-A MLAT infonnation for conducting ATC services at D2 l using the STARS automation platfonn operating in Fusion Display Mode (FDM).
2. Audi ence. This order applies to Detroit TRACON (021) and Detroit ATCT (DTW).
3. Where Can I Find This Order? This order is available on the MyFAA employee website at https://employees.faa.gov/tools resources/orders notices/ .
4. Cancellation. This order cancels FAA Order JO 7110.121, Precision Runway Monitor-Alternative (PRM-A) Multilateration (MLAT) data for surveillance at Detroit TRACON (021) dated November 9, 2015.
5. Explanation of Change. This change removes the restriction to the use of Final Monitor Aid (FMA) when operating in Fusion Display Mode (FDM). In March 2018, the restriction on the use of FMA in FDM was removed from the 7110.65 and 7210.3.
6. Procedures.
a. When operating in FDM, PRM-A MLAT data will only be used by STARS within the "keyhole" coverage area and as depicted on the STARS displays.
NOTE- 111e Key/role Coverage area is defined as tlrat airspace wit Irin 26 miles ofthe Detroit Metropolitan Wayne County Ailport ASR-9 and witl,in 2.8 miles east and abeam oJDTW splaying to a point 7 miles east oft/re centerline of4U22R and within 2.6 miles west and abeam DTW ailport splaying to a point 5. 7 miles west oft/re centerline ofRy JR/21 L.
b. The use of PRM-A MLAT surveillance data beyond the defined boundaries of the "keyhole" is not authorized.
c. All procedures and requirements contained in FAA Order JO 7110.65 related to terminal separation standards, including the provision of3NM separation apply.
7. Distribution. This order is distributed to the following ATO service units: Air Traffic Services, Mission Support Services, and Systems Operations; the Office of ATO Safety and Technical Training; the Air Traffic Safety Oversight Service; and the William J. Hughes Technical Center.
8 . Background. Detroit TRACON is currently using the STARS system in single sensor mode for air traffic display of targets and aircraft separation services. They also employ a STARS Final Monitoring Aid (FMA) Display that utilizes the MLAT surveillance provided by the Precision Runway Monitor- Distribution: Electronic Initiated By: AJV-8 Air Traffic Procedures JO 7110.121A 03/20/2019 Alternative (PRM-A) system to monitor simultaneous independent approaches to their closely spaced parallel runways. MLAT provides highly accurate surveillance reports with a typical update rate of one second. Although the STARS single sensor configuration does not allow for the use of MLAT surveillance to support the display of target position to a controller, MLAT surveillance currently contributes to the system track position used for the STARS safety logic, supporting the logic for both conflict alerts (CA) and minimum safe altitude warnings (MS A W). MLAT technology utilizes signals from Air Traffic Control Radar Beacon System (ATCRBS) (Modes A and C), ADS-B, and/or Mode S equipped aircraft transponder transmissions to calculate aircraft position. It employs a distributed network of transmitters/receivers, placed in strategic locations around the airport and other TRACON airspace locations to collect these transmissions. The ASDE-X system creates highly accurate MLAT track data by triangulating on these transmissions. This MLAT sensor data is sent from ASDE-X to STARS.
9. Safety Management System. The provisions of this order are based on the Standard Terminal Automation Replacement System (STARS) Fusion with Multilateration (MLAT) Safety Risk Management Document (SRMD), Separation Standards Performance Analysis for STARS; and prepared by the FAA Surveillance and Broadcast Services Program. These SRMDs supports the procedural guidance contained in this order. The editorial update being proposed in this revision does not require any additional safety analysis.
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Sharon Kurywchak Acting Director, Air Traffic Procedures
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Mission Support Services