J.22 JO 6950.2E.pdf

U.S. DEPARTMENT OF TRANSPORTATION

FE DE RAL AVIATION ADM I N I STRATION

Air Traffic Organization Policy

Effective Date: ffi r0lt0l20t9

SUBJ: Electrical Power Policy lmplementation at NationalAirspace System Facilities

The primary purpose of this order is to provide direction for implementing the electrical power policy at National Airspace System (NAS) facilities. This order is a companion order to JO 6030.2A, Elecfrical Power Policy.

This order does not address emergency/fire life-safety systems.

This order identifies:

o The Power System ArchitecJures most cost-effectively meeting the performance requirements of NAS Staffed Infrastructure Facilities.

o The preapproved, usual, and prevailing power system configurations/Power Source Codes for Federal Aviation Administration (FAA) infrastructure facilities, and NAS Systems and equipment.

o The policies regarding use of alternativo power system configurations/Power Source Codes.

Jeffrey S. P

Vice Presi Technical Operations Se

Distribution: Electronic Initiated By: AJW-22

10/10/2019 JO 6950.2E

Table of Contents Paragraph Page

Chapter 1. General Information ................................................................................................... 1-1 1-1. Purpose of This Order. ................................................................................................ 1-1 1-2. Audience...................................................................................................................... 1-1 1-3. Where I Can Find This Order...................................................................................... 1-1 1-4. Cancellation................................................................................................................. 1-1 1-5. Explanation of Policy Changes. .................................................................................. 1-1

Chapter 2. Roles and Responsibilities ......................................................................................... 2-1 2-1. Air Traffic Program Management Office and/or Integrated Product Teams. ............. 2-1 2-2. Operations Engineering Support Groups (AJW-C24 / AJW-E24 / AJW-W24) ......... 2-1 2-3. Power Services Group (AJW-22)................................................................................ 2-1 2-4. Planning and Requirements (P&R) (AJV-C / AJV-E / AJV-W) ................................ 2-1

Chapter 3. Implementation Guidance .......................................................................................... 3-1 3-1. Unstaffed Infrastructure Facilities............................................................................... 3-1 3-2. Redundancy of Standby Power Sources...................................................................... 3-2 3-3. Staffed Infrastructure Facility Power Architectures.................................................... 3-2 3-4. NAS Facility and Equipment Power Configurations. ................................................. 3-2 3-5. Clarification for Remote Communication Facilities. .................................................. 3-2 3-6. Alaskan Region Electrical Power Policy..................................................................... 3-3

Chapter 4. Power Source Code Guidance.................................................................................... 4-1 4-1. Power Source Codes.................................................................................................... 4-1 4-2. Power System Architectures. ...................................................................................... 4-2 4-3. Source of Power Requirements. .................................................................................. 4-2 4-4. Continuous Power Airport........................................................................................... 4-2 4-5. Instrument Flight Rules (IFR) Category (Cat) II/III. .................................................. 4-2 4-6. Alternate Power Configurations.................................................................................. 4-2

Chapter 5. Technical Guidance.................................................................................................... 5-1 5-1. Electrical Power to NAS Equipment........................................................................... 5-1 5-2. Specific Requirements for Various Power Services.................................................... 5-1

a. Engine Generator Standby Power Systems.............................................................. 5-1

b. Battery Standby Power Systems. ............................................................................. 5-1

c. Site-Generated Power Systems. ............................................................................... 5-2

d. Dual-Source Utility Power....................................................................................... 5-2

e. Agency owned PX. .................................................................................................. 5-2

5-3. Co-Located Facilities. ................................................................................................. 5-2 5-4. Power Conditioning Devices....................................................................................... 5-3 5-5. Remote Monitoring. .................................................................................................... 5-3 ii

5-6. Non-FAA Power Systems. .......................................................................................... 5-3 5-7. Connecting Equipment to NAS power systems. ......................................................... 5-3 5-8. Maintenance Bypass Switch........................................................................................ 5-4 5-9. Special Considerations. ............................................................................................... 5-5

a. Meteorological. ........................................................................................................ 5-5

b. Accessibility............................................................................................................. 5-5

c. Defense Readiness. .................................................................................................. 5-5

d. Military Requirements. ............................................................................................ 5-5

e. Power Quality. ......................................................................................................... 5-5

f. Business Decision. ................................................................................................... 5-5

Chapter 6. Administrative Information........................................................................................ 6-1 6-1. Distribution.................................................................................................................. 6-1 6-2. Background. ................................................................................................................ 6-1 6-3. Authority to Change Appendix. .................................................................................. 6-2 6-4. Related Publications. ................................................................................................... 6-2

Appendix A. Definitions and Acronyms .................................................................................... A-1

Appendix B. Preapproved NAS Facility and Equipment Power Configurations ....................... B-1

Appendix C. Power System Architectures.................................................................................. C-1

Appendix D. Staffed Infrastructure Facilities............................................................................. D-1 iii

List of Tables Table Page Table 1. Power Source Code Definitions.................................................................................... 4-1 Table 2. Power System Architecture Codes .............................................................................. C-1 Table 3. Bus Support Matrix...................................................................................................... C-2 Table 4. Facility Power System Topology and Facility Type ................................................... D-2 iv

Chapter 1. General Information

1-1. Purpose of This Order. This order provides direction for electrical power policy implementation at the National Airspace System (NAS) facilities in accordance with the latest version of Order 6030.20, Electrical Power Policy.

This order identifies:

a. The Power System Architectures most cost-effectively meeting the performance requirements of NAS Staffed Infrastructure Facilities.

b. The preapproved, usual, and prevailing power system configurations/Power Source Codes for Federal Aviation Administration (FAA) infrastructure facilities, and NAS Systems and equipment.

c. The policies regarding use of alternative power system configurations/Power Source Codes.

This order also defines the Power Source Codes (PSC) for use in Facility, System, and Equipment Profile (FSEP). These codes were originally defined in Order 6000.5C, Facility, Service, and Equipment Profile, Appendix D “Special Use Facilities Master File Reporting Codes”. Revision D of Order 6000.5 transferred these definitions to this order.

1-2. Audience. This order applies to all FAA employees and managers who directly or indirectly support NAS Infrastructure Facilities, including but not limited to: involved with implementation of power systems within the NAS; those who maintain and use FSEP; NAS program offices; National Airspace System Technical Evaluation Program evaluations.

1-3. Where I Can Find This Order. You can find this order on the Directives Management System (DMS) website:

https://employees.faa.gov/tools_resources/orders_notices/, or go to the MYFAA Employee Website, Select ‘Tools and Resources’, then select ‘Orders and Notices’.

This order may also be found on the Power Services Group, Orders, Standards and Specifications webpage:

https://employees.faa.gov/org/linebusiness/ato/operations/technical_operations/atc_facilities/pow er_services/sys_eng_team/stand_specs/

1-4. Cancellation. This order cancels Order 6950.2D, Electrical Power Policy Implementation at National Airspace System Facilities, dated October 10, 1998.

1-5. Explanation of Policy Changes.

a. Reestablishes existing and adds new Power Source Codes. The codes defined and used in previous revisions of this order did not adequately serve to describe the various power equipment configurations within the NAS.

b. Establishes Power System Architectures, specific configurations of power distribution equipment for staffed and unstaffed infrastructure facilities.

c. Revises existing appendices and added new appendices.

1-1 https://employees.faa.gov/tools_resources/orders_notices/ https://employees.faa.gov/org/linebusiness/ato/operations/technical_operations/atc_facilities/power_services/sys_eng_team/stand_specs/ https://employees.faa.gov/org/linebusiness/ato/operations/technical_operations/atc_facilities/power_services/sys_eng_team/stand_specs/

d. Reformats the order to align it with the requirements of Order 1320.1E, FAA Directives Management:

http://www.faa.gov/documentLibrary/media/Order/1320.1E.pdf

1-2 http://www.faa.gov/documentLibrary/media/Order/1320.1E.pdf

Chapter 2. Roles and Responsibilities

2-1. Air Traffic Program Management Office and/or Integrated Product Teams. The Air Traffic Program Management Office and/or Integrated Product Team for NAS Air Traffic Control services and systems, i.e. Navigation, Surveillance, Communication, Weather, Automation, etc., will:

a. Identify the power requirements for their respective products. Power requirements include voltage, current, power, frequency, alternating/direct current, standby power, reliability/availability/maintainability (FAA-HDBK-006C). Use of renewable and sustainable energy sources shall be considered, in accordance with JO 1053.3, Air Traffic Organization Energy Efficient and Sustainable New Construction and Major Renovation.

b. Identify and budget for power equipment at new infrastructure facilities.

c. Identify and budget for power equipment when power at existing infrastructure facilities does not meet the requirements for the particular NAS system or equipment.

2-2. Operations Engineering Support Groups (AJW-C24 / AJW-E24 / AJW-W24) will:

a. In association with National Engineering Support Group (AJW-29), periodically review the performance of facility power systems and recommend changes consistent with operational requirements.

b. Determine whether the infrastructure facility power system at a particular facility is appropriate for the NAS Air Traffic Control equipment being installed. Use of renewable and sustainable energy sources shall be considered, in accordance with JO 1053.3, Air Traffic Organization Energy Efficient and Sustainable New Construction and Major Renovation.

2-3. Power Services Group (AJW-22) will:

a. Issue technical standards and guidance to implement the power configurations necessary to meet requirements of this order and Order 6030.20.

b. Identify and budget for sustained power support programs required by the latest version of FAA Acquisition Management System.

c. Establish power quality acceptance criteria for systems and equipment before connection to NAS Power Buses is allowed.

2-4. Planning and Requirements (P&R) (AJV-C / AJV-E / AJV-W) will:

a. Review facility power requirements against preapproved power equipment configuration shown in Appendix B.

b. If the proposed replacement is included in Appendix B, then proceed with Project

Origination.

c. If the proposed replacement is not included in Appendix B, then coordinate creation of

NAS Change Proposal (NCP) documenting deficiencies and requesting alternative configuration.

Section 5-9 provides guidance for special considerations.

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Chapter 3. Implementation Guidance

3-1. Unstaffed Infrastructure Facilities. All federal and non-federal NAS equipment and facilities will be provided with power of a reliability and quality that is commensurate with (1) the equipment/facility mission requirements; and (2) the standards given within this order.

Appendix B of this order lists the preapproved, usual, and prevailing power configurations for unstaffed infrastructure facilities, and NAS systems and equipment. These configurations have been determined by the various Air Traffic Program Management Offices / Integrated Product Teams and Engineering Services as configurations that will best meet the requirements for the majority of NAS systems and equipment. The listed power configuration is not to be understood as the “required” configuration. Other configurations are acceptable, provided they satisfy the operational requirements of the facility/equipment.

a. A change of power configuration in the published list does not in and of itself provide authority for changing the installed power system on an existing system.

b. New facility installations will be configured in accordance with this order. A Local NCP shall be approved documenting any other configuration, with the Configuration Control Decision (CCD) recorded in the Facility Reference Data (FRD).

c. Existing facilities may retain without NCP their existing power configurations, provided the existing power configuration is in conformance with prior standards and meets the operational requirements of the facility. Power equipment replacement projects will require a NCP if replacement equipment is not in accordance with Appendix B.

d. Infrastructure facilities previously in accordance with Appendix B that no longer qualify because of reclassification, for example, a Very-High-Frequency Omnidirectional Range Tactical Air Navigation (VORTAC) that is now a Very-High-Frequency Omnidirectional Range/Distance Measuring Equipment, may keep what they have without NCP until such time as all or a portion of the power equipment is at End of Life. Power equipment replacement projects will require a NCP if replacement equipment is not in accordance with Appendix B.

e. Additional or replacement equipment that is Form/Fit/Function equivalent to existing equipment at an existing facility does not make the facility a “new facility” needing to comply with 3-1.b.

f. Facilities with battery and engine generator standby power systems may keep what they have, without NCP; until such time as all or a portion of the power equipment is at End of Life.

At such time, the facility shall transition to the configuration of Appendix B, or obtain an approved NCP.

g. Transition to new power configurations for existing facilities will be accomplished under the normal budgetary and Corporate Work Plan processes. New power configurations are considered establishment projects, and are not generally covered under NAS Capital Investment Plan for Power Systems Sustained Support without management approval.

h. Exceptions to the listed configurations shall be separately justified in accordance with Order 1800.66, Configuration Management Policy:

http://www.faa.gov/documentLibrary/media/Order/1800.66.pdf when a retention, establishment, modification, or improvement project is proposed.

i. Changes to the power system or the installation of new equipment require the accomplishment or update of load flow, voltage drops, short circuit analysis, arc flash, and

3-1 http://www.faa.gov/documentLibrary/media/Order/1800.66.pdf protective device coordination studies in accordance with FAA-STD-032, “Design Standards for National Airspace System Physical Facilities”:

http://www.tc.faa.gov/its/worldpac/standards/faa-std-032.pdf and the latest revision of Order 6950.27:

https://employees.faa.gov/documentLibrary/media/Order/6950_27_A.pdf Such studies are part of the project scope and funded by the implementing organization.

3-2. Redundancy of Standby Power Sources. The two common methods of supplying long-time standby power to NAS facilities and equipment are engine generator (EG) standby power systems and battery standby power systems. An individual NAS facility or equipment may be provided with one or the other, but not both. EG systems are preferred for the following situations:

• When the equipment load is fifteen (15) kilowatt / kilo Volt-Amperes (kVA) and larger, and the desired backup time is greater than 12 hours;

• When the power quality, including frequency of outages, is such that the batteries are not able to be fully recharged between outages;

• When amp-hour nominal battery capacity is at least twelve (12) times the ampere rating of the battery charging equipment.

• When the HVAC/environmental needs of the facility cannot be met by a battery standby system. Battery life, for example, is reduced as battery temperature increases with non-operating

HVAC.

3-3. Staffed Infrastructure Facility Power Architectures. Appendix D of this order identifies the normal, funded power architecture determined to meet the typical requirements for each NAS staffed infrastructure facility, e.g., Air Route Traffic Control Center (ARTCC), Terminal Radar Approach Control (TRACON), Air Traffic Control Tower (ATCT), at the time of construction.

Subsequent changes in ATCT Level do not provide sufficient authority for changing the existing power system architecture. Necessary changes of power system architecture shall be requested through a Local NCP in accordance with the latest version of Order 1800.66, and the approved CCD recorded in the FRD.

3-4. NAS Facility and Equipment Power Configurations. Appendix B of this order identifies the preapproved, usual, and prevailing, funded power configuration determined to meet the requirements for each NAS unstaffed infrastructure, and non-infrastructure system/subsystem/equipment. Should a particular installation have operational and performance requirements mandating a power configuration different from the listed power configuration, the change of power configuration shall be requested through a Local NCP in accordance with the latest version of Order 1800.66, and the approved CCD recorded in the FRD. See paragraph 5-9 for special considerations.

3-5. Clarification for Remote Communication Facilities. Existing Remote Communication Facilities (RCF), i.e., RTR, RCAG, ECS, and BUEC that have a fully supportable and fit-for-service Standby EG (SX) are not required to replace their SX with a DCBUS or add a DCBUS.

Per Paragraph 3.1.c, existing RCF that have an existing SX can plan to replace the SX with an

3-2 http://www.tc.faa.gov/its/worldpac/standards/faa-std-032.pdf https://employees.faa.gov/documentLibrary/media/Order/6950_27_A.pdf

SX, or establish a DCBUS when the SX is at end of life or no longer fit for service. A NCP is required if the SX is to be replaced by an SX.

RCF that currently have a DCBUS system and an SX are not required to remove either so long as the systems are serviceable. When the time comes for power system replacement, either the DCBUS or the SX, but not both, will be replaced.

New facility installations will be configured in accordance with this order. A Local NCP shall be approved documenting any other configuration, with the CCD recorded in the FRD.

3-6. Alaskan Region Electrical Power Policy. NAS facilities in Alaska experience various levels of unreliability of commercial power. Reliance on air transportation for facility access and the extreme weather conditions creates unique situations which are not specifically addressed in the national policy orders. Order AL 6030.19B, Alaskan Region Electrical Power Policy Criteria, applies to all existing and planned facilities within the Alaska region and provides for site adaptation. This order does not require a NCP for Alaska facilities that are in accordance with this order or AL 6030.19B.

3-3

Chapter 4. Power Source Code Guidance

4-1. Power Source Codes. PSCs are used in FSEP to describe the basic power configuration in place supporting NAS infrastructure facilities, systems, and equipment.

The Power Source Codes listed in this order are defined below:

Table 1. Power Source Code Definitions PSC Description of Power Configuration

1 Commercial power source and standby engine generator(s).

4 Single source of commercial power.

8 Dual, independent sources of commercial power.

A

Commercial power source, standby engine generator, and PCS, usually a Facility Uninterruptible Power Supply (UPS) with energy storage less than four hours. This configuration provides conditioned, uninterruptible, and long-time engine generator standby power primarily for ac-voltage powered equipment.

B Commercial power source, standby engine generator, and Mini-UPS. This configuration provides conditioned, uninterruptible, and long-time engine generator standby power primarily for ac-voltage powered equipment.

D

Commercial power source, battery standby power system, with or without a dc-to-ac inverter. A UPS with less than four (4) hours battery operating time is not included in this category.

Configurations without a dc-to-ac inverter provide conditioned, uninterruptible, and long-time standby power primarily for dc-voltage powered equipment. Configurations with a dc-to-ac inverter can provide conditioned, uninterruptible, and long-time battery standby power primarily for ac-voltage powered equipment.

E Commercial power source, battery standby power system, with or without a dc-to-ac inverter (PSC D) + standby engine generator. Used by special permission.

F

Commercial power source, battery standby power system coupled with a fuel cell for extended operation, with or without a dc-to-ac inverter. Configurations without a dc-to-ac inverter provide conditioned, uninterruptible, and long-time standby power primarily for dc-voltage powered equipment. Configurations with a dc-to-ac inverter can provide conditioned, uninterruptible, and long-time battery standby power primarily for ac-voltage powered equipment.

H Commercial power source and a Facility UPS or Mini-UPS / MUPS.

S Used by NAS equipment to indicate the power configuration is that of the infrastructure facility.

This code replaces the “same as host facility” note.

V Renewable energy source such as photovoltaic or wind turbine with a battery system. Standby commercial power is optional.

W When the facility is itself an FAA power source or equipment; e.g., CPDS, ACEPS, DCBUS, Primary Power Engine Generator (PX), Mobile Engine Generator (MX), PCS, UPS, CLEAN, ELD, etc. Refer to Appendix A, Definitions and Acronyms, as necessary.

X Used when the facility has no source or requirement for power; e.g., passive reflectors, trails, roads, etc.

Z Single source of prime power continuously generated by an independent generating device;

e.g., prime power engine generator, thermoelectric, nuclear, fuel cell, etc.

4-1

4-2. Power System Architectures. PSC do not distinguish the various architectures available for NAS systems. The PSC described the components of the power equipment involved, but not the design configuration. The Power System Architecture (PSA) describes design configuration, how these components are put together, such as ARTCC Critical and Essential Power System (ACEPS), Critical Power Distribution System (CPDS), or simple radial system. The tables of Appendix C of this order list these various architectures, and the power buses supported.

4-3. Source of Power Requirements. The power configurations listed in this order are based upon

• NAS Requirements Documents

• Air Traffic Program Management Office and/or Integrated Product Team,

• Engineering Services (AJW-2C / AJW-2E / AJW-2W)

• Power Services Group (AJW-22)

This order does not independently dictate a particular architecture to the exclusion of any other.

This document is not the source of power configuration requirements.

4-4. Continuous Power Airport. For an airport identified as a Continuous Power Airport (CPA), as defined in Order 6030.20, only the facilities associated with the operation of the one designated CPA runway shall be permitted to be configured with CPA facility power service levels indicated in Appendix B of this order.

4-5. Instrument Flight Rules (IFR) Category (Cat) II/III. Air Traffic operations under IFR Cat II and IFR Cat III conditions require certain Navigation and Landing systems to transfer to alternate power within 1 second of power failure. The 1-second transfer time can be obtained in different ways, including powering the facility with the engine generator during the Cat II/ III conditions and using commercial power as the standby source. In this mode, the facility load will automatically transfer back to commercial power within the required 1 second transfer time should the engine fail.

Operating the engine generator in other than emergency conditions requires permitting in accordance with federal/state/local environmental regulations.

There are no specific requirements regarding the composition of this alternate power source, such as use of an engine-generator power or alternate commercial power feed. Alternate configurations will be approved through the normal Configuration Management process.

4-6. Alternate Power Configurations. Appendix B of this order indicates the preapproved, usual, and prevailing power service for each facility type. In some instances, an alternate configuration may satisfy facility requirements more cost effectively. Requests for the following alternate configurations shall be accomplished through the NCP process:

a. Power Source Code V should be used in place of Codes 4, 1, and D where reliability and life cycle cost considerations are favorable compared with engine generator systems or the installation and costs of primary commercial power. Battery reserve power for these systems should be sized for a minimum of 4 hours service based on the worst case environmental conditions for the particular facility location.

4-2

b. Power Source Code Z should be used in place of Code 4 where reliability and life cycle cost considerations are favorable compared with the installation and costs of primary commercial power.

c. Power Source Code D should be used in lieu of Code 1 when equipment changes allow the facility's operational requirements to be satisfied by a battery standby power system.

4-3

Chapter 5. Technical Guidance

5-1. Electrical Power to NAS Equipment. The quality of the electrical power provided to a facility shall be of acceptable reliability and availability as required by the equipment. The performance characteristic requirements of the facility load ultimately dictates the necessary voltage and frequency, standards and tolerances required by each individual power system.

The ultimate and primary goal of any power system is to provide an acceptable level of power to the NAS equipment loads to insure the safe separation of air traffic. Standby power sources such as FAA Engine Generators and FAA UPSs will supply satisfactory power. Consult with Power Services Group as needed for corrective actions.

5-2. Specific Requirements for Various Power Services.

a. Engine Generator Standby Power Systems.

(1) Facilities which utilize one or more engine generators as a standby power system shall start at least one standby engine generator (SX) and begin providing standby power within 30 seconds of a failure of the prime power source, and shall be capable of sustained operation of a minimum of seventy-two (72) hours.

(a) Typically, a sufficient fuel supply shall be maintained in the storage system for the minimum required operating time. A reduced fuel supply may be maintained at locations where fuel is readily available and delivery agreements are in place; e.g., major airports and where fuel volume is continuously monitored. At facilities with difficult access, fuel supplies shall be determined on a site-by-site basis. In all cases, fuel supplies shall be based on actual engine generator loading, not on maximum engine fuel consumption rates.

(b) Facilities with pipeline-fed standby engine generators do not require stored fuel supplies, with the exception of facilities located in areas subject to pipeline failures. Pipeline-fed fuel sources are subject to pipeline failure since valves and other flow control devises are outside the operational control of FAA personnel and should be replaced with dedicated on site fuel source. At these locations, fuel supplies shall be established on a site-by-site basis.

(2) Closed transition switching, switching with no interruption, shall be installed where justified by operational requirements, after coordination with Power Services Group – Systems Engineering, and the electric utility.

(3) Closed transition Facilities with a facility UPS are generally not allowed.

b. Battery Standby Power Systems.

(1) Power systems incorporating batteries provide conditioned, uninterruptible and standby power to facilities where the NAS equipment primarily uses direct current for proper operation. Alternating current may be available for powering equipment. These systems shall provide such power immediately (without interruption) upon failure of the prime power source and shall be capable of sustained operation for a minimum of four (4) hours at the lowest normal operating temperature of the facility, usually the inside ambient temperature. Systems incorporating renewable sources, e.g. fuel cells, photovoltaic and the like, are not required to have the minimum 4-hour battery reserve, as the batteries in this case are not needed solely to provide the extended standby power.

5-1

(2) Battery standby power systems must be sized to provide sustained operation for a minimum of four (4) hours. The 4-hour minimum operating time may be increased for locations in remote areas and for facilities where redundant services are not available.

(3) Battery Standby Power systems should be sized to accommodate the total needs of the facility, including not only NAS operational needs but also the infrastructure needs such as lighting and HVAC.

(4) A permanently wired means of connection with an appropriate transfer switch may be provided where proven numerous power outages occur, to permit a safe and accurate means to connect and disconnect a MX to the facility's electrical system to permit recharge of the batteries in the event of a prolonged prime power outage, the duration of which is longer than the installed backup time. This connection is particularly recommended where the amp-hour nominal battery capacity is at least twelve (12) times the ampere rating of the battery charging equipment.

(5) The battery system outputs shall be in multiples of 12 volts; e.g., 12, 24, 36, 48 volts and be sized for the systems served.

(6) Battery charging systems shall be sized to fully recharge a depleted battery within 12 hours.

c. Site-Generated Power Systems. Site generated power systems, that is, prime power generated by a photovoltaic or wind generator with a battery system, FAA-prime power engine generator plant at the facility site or remote from it, and prime power generated by an independent device such as thermoelectric, nuclear, fuel cell, non-rechargeable battery, etc., shall be established to provide continuous power without required on-site maintenance activity more frequent than the normal facility preventive maintenance schedule.

d. Dual-Source Utility Power Facilities which utilize a source consisting of two (or more) commercial/utility power feeds and having no other standby power shall provide transfer from feed to feed within a maximum of 15 seconds.

e. Agency owned PX. Agency owned PX power systems shall only be utilized where no other source of power is available or where the expense of other sources of power would exceed that of establishing and operating such a system. The system shall consist of at least one engine generator - the number of EGs shall be based on the criticality of the site- specifically designed for continuous operations, and shall have either automatic transfer switches designed in accordance with agency standards or 24 hour attendance.

5-3. Co-Located Facilities. Where system/equipment or subsidiary components are co-located at a facility or shelter and different power configurations are indicated by Appendix B of this order, or where the PSC is listed as “S” or where "same as host facility" appears, the following criteria shall be used, provided that power quality, capacity, and availability are not degraded:

a. At facilities where engine generator standby power is available for NAS services, NAS systems, equipment, and support components may be connected to the engine generator, provided the existing SX can handle the additional loads, and configured as PSC 1 or A.

b. At facilities where battery standby power is available for NAS services, NAS systems, equipment, and support components may be connected to the existing battery system, providing the existing battery system that has requirements for standby power may be reconfigured to utilize the battery standby power, and configured as PSC D.

5-2

5-4. Power Conditioning Devices. Power conditioning devices not addressed by the PSC or PSA codes in Appendix C of this order may be required at some facilities to provide a stable regulated power source. Installing a power conditioning device, including a UPS or mini-UPS/ MUPS, on a power-conditioned bus, e.g. critical bus, is not recommended. Power conditioning devices are considered equipment loads, and the requirements of 5-7 apply. The Program Office requesting the power conditioning device is responsible for associated costs and activities.

a. Power conditioning equipment may be provided for NAS electronic equipment and systems that fall into one or more of the following categories:

(1) The NAS system/equipment is designated as Safety-Critical or Efficiency Critical and is listed in the NAS Configuration Management Document, NAS-MD-001.

(2) The NAS system/equipment is subject to power outages or transients in excess of a few milliseconds, which cause equipment operation to cease, or cause other equipment or subsystems to cease operations for 30 seconds or more.

(3) The NAS system/equipment is subject to frequent or intermittent power fluctuations of short duration, which significantly jeopardize the successful accomplishment of the FAA mission related services.

(4) The NAS system/equipment is vulnerable to damage or misalignment because of transients and short duration power outages.

b. Prior to the installation of a power conditioning device to support specific loads in an existing facility, the following shall be obtained:

(1) An analysis of the existing electronic equipment load characteristics to establish power consumption, current harmonics, inrush current profile, power factor, etc.

(2) An analysis to insure compatibility between the equipment load analysis obtained and the proposed power conditioning device.

(3) An analysis of the impact of the proposed power conditioning device on its source and the rest of the facility; e.g., voltage regulation, harmonic distortion, inrush currents and transient generation, resulting from powering the equipment load. This analysis shall be conducted in accordance with the latest version of Order 6950.27, https://employees.faa.gov/documentLibrary/media/Order/6950_27_A.pdf

(4) An analysis of the potential to introduce or worsen a "single point of failure" and the subsequent impact to the NAS.

5-5. Remote Monitoring. Facilities with standby power systems capable of being remotely monitored should monitor the status of commercial power and standby power systems.

Reference Orders 6000.15, General Maintenance Handbook for National Airspace System (NAS) Facilities, and Order 6000.30, National Airspace System Maintenance Policy. The facility SSC is the benefiting organization and in responsible for associated costs and activities.

5-6. Non-FAA Power Systems. FAA facilities with standby power systems which are owned and operated by a non-FAA authority, must meet the requirements of the latest version of Order 6950.11, Reduce Electrical Power Interruptions at FAA Facilities.

5-7. Connecting Equipment to NAS power systems. Before connecting any equipment to any FAA power bus/system, the following criteria must be satisfied. The organization proposing the equipment is responsible for associated costs and activities.

5-3 https://employees.faa.gov/documentLibrary/media/Order/6950_27_A.pdf

a. The equipment shall be operated and maintained in accordance with established FAA practices. For leased equipment that will be operated or maintained by a contractor, the contract shall require the equipment to be operated and maintained in accordance with FAA practices.

Maintenance records and equipment shall be available at each leased equipment location for review and technical evaluation by designated FAA personnel. Equipment shall be tested until the FAA is assured it is compatible with the system from which it will be powered. Testing shall not be performed on a Critical or Essential power bus. All testing shall be completed and approved prior to the equipment being connected in an operational environment. At no time shall any equipment be connected to an existing facility's power system if it adversely affects the operation or performance of other equipment.

b. The power required by the equipment must be analyzed to insure that the facility power system does not become overloaded or unbalanced.

c. Peak inrush current of electronic equipment must not exceed the limits specified in FAA- G-2100, Electronic Equipment, General Requirements. All other loads must have a peak inrush current characteristic that will not cause power anomalies detrimental to the facility operation, nuisance over-current device operation, or operational problems with the source.

d. Power factor of nonlinear loads, such as electronic equipment and variable frequency drives (VFD), must not exceed the limits specified in FAA-G-2100. For all other loads, the power factor measured at the service entrance shall be within 0.8 lagging to 1.0 or as required by the local utility contract. Power factor at the engine generator output shall be 0.8 lagging to 1.0.

Power factor at all other locations shall be considered with regard to energy conservation and performance of power sources and power conditioners. The total power factor is the product of the displacement power factor and the distortion power factor, PF = (PFdisp) * (PFdist).

Equipment installed at facilities that have a pre-existing leading power factor shall not cause the facility to have greater leading power and a lower leading power factor.

e. The impact to the power bus from the current total harmonic distortion (THD) of each equipment/system and environmental equipment/system (such as air conditioners, lighting, UPS, VFDs, etc.) shall be considered when connecting equipment to a power bus. The current THD of electronic equipment shall not exceed the limits specified in FAA-G-2100, Electronic Equipment, General Requirements. Equipment listed under International Electrotechnical Commission IEC 61000-3-2, Electromagnetic compatibility (EMC) – Part 3-2: Limits – Limits for harmonic current emissions (equipment input current ≤16 A per phase), or IEC 61000-3-4, Electromagnetic compatibility (EMC) – Part 3-4: Limits – Limitation of emissions of harmonic currents in low-voltage power supply systems for equipment with rated current greater than 16 A, is deemed in compliance with the current harmonic distortion requirements of this order.

5-8. Maintenance Bypass Switch. Maintenance Bypass Switches (MBS) around transfer switches are permitted – without NCP – for Airport Surveillance Radar (ASR) at Level 10 and higher airports so equipped and where national configuration drawings allow. Installations for other facilities will require an approved NCP.

A Level 10 or higher MBS-equipped airport that subsequently is reclassified to Level 9 or lower is not required to remove the MBS or file NCP to retain the MBS. A Level 9 or lower airport that is subsequently reclassified to Level 10 or higher is not required to install a MBS.

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5-9. Special Considerations. At some facilities, special situations may dictate a power configuration different from that described in paragraph 3-1 and assigned in Appendix B. Some of the special situations are discussed below:

a. Meteorological. A facility located in an area with a history of electrical, ice, or wind storms, which have caused abnormally frequent prime power disruptions and/or excessively long outages, may qualify for a higher grade power configuration if such disruptions cannot be tolerated.

b. Accessibility. A facility located in a remote area where a prime power outage is likely to be of a duration incompatible with operating requirements, and could result in excessive exposure of maintenance personnel to hazards, may qualify for a higher grade power configuration.

c. Defense Readiness. In some cases, the requirement to maintain an effective defense readiness posture differs from the normal operational requirement.

d. Military Requirements. A higher grade power configuration may be necessary due to specific military requirements.

e. Power Quality. A facility located in an area of poor utility power quality that would adversely affect facility operation.

f. Business Decision. Economic/operational considerations may dictate a specific power system type.

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Chapter 6. Administrative Information

6-1. Distribution. This order will be distributed electronically. Per N JO 1720.89, Elimination of Paper Printing and Distribution of Technical Operations Policy Directives, distribution of this order within Washington Headquarters; Regional Offices; the William Hughes Technical Center;

the Mike Monroney Aeronautical Center; and the Air Traffic Organization (ATO) Service Centers and Service Areas is available through this website:

https://employees.faa.gov/tools_resources/orders_notices/ Personnel in these offices will now be responsible for viewing, downloading, and subscribing to receive electronic mail notification for this and other AJW national and ATO policy directives.

This order may also be viewed at the AJW-22 Power Services Group website, located here:

https://employees.faa.gov/org/linebusiness/ato/operations/technical_operations/atc_facilities/pow er_services/sys_eng_team/stand_specs/

6-2. Background. FSEP lists facilities, systems, and equipment, and the distinction is not always clear or maintained. Systems and equipment work together to provide a NAS service such as Automation, Communication, Navigation, Surveillance, or Weather. Facilities are the infrastructure supporting the NAS systems and equipment. An ATCT is easily judged to be a facility. En Route and Terminal Facilities are generally clear. Confusion becomes more apparent when Unstaffed Infrastructure Facilities are concerned; as such a facility may host multiple services, yet be known by only one name. A VOR Facility likely houses a VOR system, but may also house another system such as a DME. If the power bus supplied by the VOR facility configuration is satisfactory for the DME, then all is well.

Confusion may also arise when a particular facility architecture supplies multiple power buses.

The very name ACEPS, for example, is ARTCC Critical and Essential Power System. It is correct that an ARTCC have an ACEPS. There may be systems and equipment located in an ARTCC that require critical power, and equipment that does not require critical power. Thus, there needs to be a code defining the appropriate power bus, independent of the actual architecture used to obtain that bus. Power Services Group took a subset of the Power Source Codes in an attempt to define power bus performance, keeping the original code, and but using the major component definitions instead of performance. Eventually, the PSC definitions were transferred to this order, and many of the original codes were no longer valid.

It is possible that a Facility, such as a storage shed, is listed in FSEP, but has no power requirement. It is therefore necessary to include a code for this “null” topology. A blank entry may be misunderstood to mean that no power topology has been entered in the record.

NAS Services are categorized by the capability and impact to the NAS. NAS Services are composed of various Systems/Subsystems/Equipment, each having certain power requirements.

However, these power requirements are not explicitly addressed by current power service and bus definitions. Some of these requirements are more obvious, such as voltage and frequency.

Other requirements are not as obvious, such as reliability, maintainability, availability. Consider a power system at a facility that has a daily power outage lasting one (1) second. If the NAS equipment is instantly operational after power restoration, then the system availability is approximately 0.999988. On the other hand, if the NAS equipment has a 30 minute restoration – the value assumed for most systems, the system availability drops to an unacceptable level of

0.97958. The power system itself is the same for both installations. The difference in

6-1 https://employees.faa.gov/tools_resources/orders_notices/ https://employees.faa.gov/org/linebusiness/ato/operations/technical_operations/atc_facilities/power_services/sys_eng_team/stand_specs/ https://employees.faa.gov/org/linebusiness/ato/operations/technical_operations/atc_facilities/power_services/sys_eng_team/stand_specs/ availability is based upon the performance of the NAS equipment, not the power to that equipment. NAS service/system power requirements do not derive from Power Services Group, but from the program office for that NAS service/system.

6-3. Authority to Change Appendix. Appendix B of this order lists the preapproved, usual, and prevailing power configurations for unstaffed infrastructure facilities, and NAS systems and equipment at the time of order publication. As new systems are introduced into the NAS, or new power requirements are determined by the appropriate Air Traffic Program Management Office and/or Integrated Product Teams, Appendix B will be updated by Power Services Group, Systems Engineering, to include the new system and appropriate power configuration.

Changes to Appendix B are under Configuration Management. Appendix B is an administrative appendix, not incorporating any policy. Coordination is not required.

For convenience, Appendix B will be maintained electronically and made available on the FAA Intranet, Power Services Group, Systems Engineering, Orders, Standards and Specifications website, https://employees.faa.gov/org/linebusiness/ato/operations/technical_operations/atc_facilities/pow er_services/sys_eng_team/stand_specs/media/6950.2%20Appendix%201%20Part%20A.pdf Personnel responsible for maintaining a technical order library are authorized to print new versions from the PSG website and insert them as desired.

6-4. Related Publications. The latest editions of the following publications are the references for implementation of electrical power policy.

FAA Order 6030.20, Electrical Power Policy.

FAA Order 1320.1E, FAA Directives Management. This order prescribes the FAA Directives System as the means for issuing policy and procedures within the FAA.

FAA Order 6000.5D, Facility, Service, and Equipment Profile (FSEP). This order sets forth policy, roles and responsibilities for the maintenance of FSEP.

6-2 https://employees.faa.gov/org/linebusiness/ato/operations/technical_operations/atc_facilities/power_services/sys_eng_team/stand_specs/media/6950.2%20Appendix%201%20Part%20A.pdf https://employees.faa.gov/org/linebusiness/ato/operations/technical_operations/atc_facilities/power_services/sys_eng_team/stand_specs/media/6950.2%20Appendix%201%20Part%20A.pdf

Appendix A

Appendix A. Definitions and Acronyms ACEPS. Air Route Traffic Control Center (ARTCC) Critical/Essential Power System.

CPDS. Critical Power Distribution System. CPDS is an umbrella system consisting of a number of different architectures such as Dual Redundant Power Distribution System (DRPDS), Critical Redundant Power Distribution System (CRPDS), ACEPS, and…