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Amendment 0001 - The purpose of Amendment 0001 is to post the FAA's responses to questions received from interested vendors. Additionally, amended SIR sections have been posted in response to question... Amendment 0001 - The purpose of Amendment 0001 is to post the FAA's responses to questions received from interested vendors. Additionally, amended SIR sections have been posted in response to questions received. All revisions in these amended SIR sections can be found in red. All other terms and conditions of this SIR, including proposal due date, remain unchanged. Original Post - The purpose of this announcement it to post a Screening Information Request (SIR) for Dual Frequency Operations (DFO) Segment 2 activities in support of the Federal Aviation Administration (FAA) Wide Area Augmentation System (WAAS). The WAAS is a mission critical, Safety of Life (SoL) navigation system within the FAA's National Airspace System (NAS). WAAS provides LNAV, LNAV/VNAV, LPV and LPV-200 levels of navigation services. The WAAS currently uses Global Positioning System (GPS) L1 C/A and L2 P(Y) semi-codeless signals with the expectation that the second civil signal, L5, would be introduced upon completion of the L5 capability within the GPS constellation as WAAS Dual Frequency Operations (DFO). WAAS DFO has been segmented into two implementation phases. The current segment, DFO Segment 1, upgrades the WAAS infrastructure to enable reception and collection of the L5 signal with the WAAS reference station network and implements system changes required to sustain the WAAS. The next segment, DFO-2, will be started with WAAS Phase 4B beginning in FY 2022. The FAA, under DFO-2, intends to utilize GPS civilian L1 Coarse Acquisition, L2 codeless/semi-codeless and L5 signals to maintain existing Single Frequency services and provide new Dual Frequency services. Under DFO-2, the WAAS will also undergo technical refresh of major processing components, transition network infrastructure from dedicated circuits to FAA cloud-based services and continue WAAS geostationary satellite constellation sustainment. Please see the attached SIR, Pricing Model, and Task Orders for further information including due dates for questions and proposals. All questions must be in writing, no phone calls please. Please refer to the following links for historical information related to the DFO-2 SIR: (https://beta.sam.gov/opp/c708fbdbdb4c489abf127d0f39a83a28/view?keywords=%22Dual%20Frequency%22&sort=-relevance&index=opp&is_active=false&page=1&organization_id=100003657) (https://sam.gov/opp/db32b292b1cc4cc2b6b8f1211210375b/view)