(U) The AN/ALR-69 Class IV Radar Warning Receiver (RWR) system integration and installation on the AC-130U Gunship is an effort to replace the existing AN/ALR-56M RWR system. Hereafter, the term "RWR system" is used in reference to the AN/ALR-69 Class IV RWR system. The RWR system shall successfully be installed, integrated and operated in the AC-130U aircraft environment. This document reflects the top level functional requirements that the RWR system must meet to detect and display the threats specified herein. The RWR system integration and installation effort shall be implemented so that the designated requirements and goals can be incorporated at some future date without future major Group A modification impacts. This SRD establishes the host aircraft installed system performance requirements for the RWR system. In addition, Appendix A to this SRD defines the classified operational performance requirements for reboresight of the high band transmit antennas.

(U) The AC-130U Gunship must be capable of close air support for special operations and conventional ground forces. The installation of the RWR effort will seek to provide the existing AC-130U Defensive Avionics Suite with a capability common to the rest of the SOF fleet.

(U) The contractor shall use the best available standards, procedures, documents and regulations to satisfy the requirements specified herein.

CP130UA01A Prime Item Development Specification for AC-130U Gunship Aircraft

21 Jan 98

A8483-001 System Specification for the Class IV Upgrade ALR-69 RWR (C)

GT4658-003 Segment Specification for the AM-6639 Amplifier Detector (S)

GT4658-005 Segment Specification for the R-2094 Receiver (S)

WR-ALC Exhibit 6909 C-10371 Indicator Control Specification (U)

WR-ALC/Exhibit 6907 IP-1310 Azimuth Indicator Specification (U)

A8116-042 MIL-STD-1553 Interface Design Document for the ALR-69 (S)

DST2660F-726-93 Special Operational Forces (Aviation) Threat Environment Description September 1993 (SOFTED) (S)

(U) The RWR system shall consist of existing ALR-69 Class IV RWR equipment specified in Table 3.1, support and training equipment to perform the mission specified in the AC-130U Gunship Prime Item Development Specification and the requirements defined in this document. The ALR-69 Class IV RWR system, when installed in the AC-130U aircraft, shall provide threat awareness against threats specified in the SOF Threat Environment Document (TED). In addition, the RWR antenna configuration shall be installed to optimize the RWR field of view (FOV) against the RF threat specified in the SOFTED. The current AC-130U Gunship configuration shall be used as the aircraft baseline for ALR-69 Class IV RWR installation effort.

(U) The ALR-69 Class IV RWR system shall provide the following functional capabilities: RF threat situational awareness, threat signal processing, reprogrammability, associated defensive support equipment and training equipment, and future Electronic Warfare (EW) interfaces to other avionics defensive/offensive equipment. The ALR-69 Class IV RWR system is an non-developmental item (NDI) to be considered as part of the federated defensive suite on the AC-130U Gunship, and shall provide the necessary capabilities to meet the performance and supportability requirements specified herein. The RWR is a software programmable system that uses a Program Loader-Verifier (PLV) to periodically update the Operational Flight Program /Mission Data Files (OFP/MDF) with the latest threat data. The major components of the AN/ALR-69 Class IV RWR system are listed in Table 3.1.

Table 3.1 List of Major ALR-69 Components

Note: *These items are common to the current RWR suite on the AC-130U.

(U) The RWR system shall function under adverse weather conditions and provide the crew with threat awareness information so evasive maneuver and/or countermeasures technique may be implemented to enhance aircraft survivability . The RWR system shall be capable of meeting the mission requirements specified in the AC-130U Gunship Prime Item Development Specification (CP130UA01A).

(U) The RWR system shall have the capability of meeting the requirements specified herein to ensure aircraft survivability when encountering the hostile environments specified in the AC-130U Gunship Prime Item Development Specification (CP130UA01A) and the SOFTED (DST 2660F-726-93).

(U) The RWR system shall detect, identify, process and display airborne interceptor (AI), surface-to-air missile (SAM) and anti-aircraft artillery (AAA) weapon systems. The overall performance of the RWR system shall provide the following functions: situation awareness, e.g., threat identification and integrated diagnostics. Situation awareness shall provide the crew with threat type, emitter mode and threat angle-of-arrival (AOA) information. The RWR system integrated diagnostics shall provide the crew and maintenance personnel system diagnostics data. The RWR Blanking Interface shall allow on-board systems to partially or totally inhibit the RWR's ability to collect data as specified in ALR-69 RWR Class IV System Specification (A8483-001). The integration of the ALR-69 Class IV RWR and High Band Reboresighting shall not degrade the current performance of the AC-130U Gunship aircraft.

(U) The RWR system installation shall retain a flightline reprogrammability capability independent of any other avionics system and/or aircraft OFP. The RWR reprogramming capability shall remain independent until the EW data bus is installed on the aircraft.

(U) The RWR system shall meet the frequency range coverage requirements specified in the RWR system specifications described in paragraph 2.1.

(U) As a goal, the RWR system installation shall have sufficient growth capabilities to minimize modifications necessary to interface with a future Avionics Bus and EW MUX Bus with consolidated EW display capability. Once the installation of the EW data bus, the bus should be used as the single point for reprogramming EW systems

(U) At a minimum, the RWR threat display information shall be sent to the EWO and copilot. The RWR display and control shall use the existing ALR-69 Class IV RWR display and control functions, including symbology.

(U) At a minimum, the RWR audio signal shall be sent to the EWO, copilot and Scanner position. The RWR shall interface with the Audio Management Unit specified in Table 3.1 to provide audio functions and capability.

(U) The installation of the RWR on the AC-130U shall be tested and evaluated in conjunction with the reboresight of the high band transmit antennas. The RWR test and evaluation shall be based on the current ALR-69 Class IV RWR performance requirements and the requirements specified in this SRD.

(U) The RWR System shall meet the reliability requirements specified in the RWR system specifications described in paragraph 2.1.

(U) The RWR System shall meet the maintainability requirements specified in the RWR system specifications described in paragraph 2.1. The RWR System LRUs shall be accessible without removing other equipment. The RWR System shall be located so that LRUs can be remove and replaced in minimal time.

(U) The RWR System shall use the same maintenance concept for the ALR-69 Class IV RWR installed on the MC-130H Combat Talon II aircraft. Maintenance shall use the ALR-69 BIT test and APM-427 simulators to verify system operation. Maintenance will also use a USM-464 to perform end to end system checks and the USM-638 will be used to perform antenna cable sweeps of the RWR System. The RWR System shall require no special support equipment other than that which is currently in the inventory.

(U) The contractor shall use best commercial practices in the design and construction of any modifications to the AC-130U Gunship.

(U) Special consideration shall be taken to avoid the use of hazardous materials on the product or in the manufacturing, maintenance, support or disposal of the system. In view of the future production time frame of this program, the EPA 17 toxins outlined in the EPA 33-50 program, heavy metals and hazardous materials controlled under the Resource Conservation Recovery Act (RCRA) and Clean Air Act or any other material the contractor knows may likely cause an environmental issue shall also be identified and the impact of their elimination assessed. The contractor shall comply with the 7 January 1993 USA Ozone Depleting Chemical (ODC) Ban and Pollution Prevention Policies eliminating the requirements and use of ODC's unless specifically approved by SAF/AQ and provide a mechanism to identify the hazardous materials incorporated or planned to be used in maintenance or support of the system. Substitution of non-hazardous materials shall have first priority. Minimized use of hazardous materials will be considered where no practical, cost effective substitutes are available. The use and or generation of hazardous and/or ozone depleting materials shall comply with applicable regulations, directives, and public law at the federal, state, and local levels regarding safe use, storage, management, and disposal for all aspects of manufacturing, operation, maintenance, and support.

(U) The RWR system security implementation shall include system security engineering and critical technology protection to ensure an integrated AC-130U aircraft system program protection process is achieved. System security shall emphasize protection of total system software.

(U) The RWR System shall meet the logistics requirements specified in the RWR system specifications described in paragraph 2.1.

(U) In the event of conflict between the requirements of this document and any other document referenced herein, the requirements of this document shall be considered a superseding requirement except as specifically provided for in the contract. All conflicts shall be brought to the attention of the procuring activity.

(U) Section 4 verification tests, analysis, inspections, demonstrations and qualifications by similarity shall be designed to verify Section 3 requirements as listed below. The contractor is responsible for assuring compliance verification for all Section 3 requirements.

a. Inspection (U) An inspection is a visual check of an item, including documentation. Inspection is defined as a visual verification that the system (including system documentation) complies with specification requirements.

b. Analysis (U) An analysis is a prediction based on an examination of an item, its elements, and their relations. Analysis is defined as a visual verification that the specification requirements have been met by technical evaluation of equations, charts, reduced data, etc. This does not generally include the normal analysis of data generated in ground or flight tests.

c. Demonstration (U) A demonstration is a functional test using simple measurements, observations, and approved procedures. Demonstration is defined as an uninstrumented test, where success is determined by observation. Also included in this category is test that requires simple quantitative measurements such as dimensions, time to perform, etc.

d. Test (U) A test is the submission of an item to conditions, operations, and procedures, usually with extensive instrumentation, to rigorously prove item performance. Test is defined as verification that a specification requirement is met by a thorough exercising of the applicable element under appropriated conditions in accordance with applicable test procedures and with a thorough analysis of the data generated.

e. Qualification by Similarity (U) A qualification by similarity is a prediction based on existing data with detailed examination of the differences and similarities between the previously qualified item and the item under consideration.

(U) Verification Cross Reference Matrix (Table) - To be determined (TBD) by the contractor and validated by the government

(U) None

(U) Appendix A is classified and provided under separate cover.