Depot Maintenance (NON-IF)
Abstract
3030: A significant portion of the F/A-18 and EA-18G airframe is believed to have additional inherent capability and a life extension may be possible for many portions of the airframe. The F/A-18 Service Life Assessment Program (SLAP) is assessing the structural and subsystem conditions of the F/A-18 fleet in order to determine what modifications are necessary to extend the aircraft design life limits to allow it to achieve Chief of Naval Operations (CNO) inventory requirements. Without SLAP and the follow on Service Life Extension Program (SLEP), aircraft are retired from the USN inventory when a design service life metric is reached. RDTE funds will support aircraft teardown to validate SLAP analysis, identify unknown fatigue areas and assess the aircraft's material condition. 3182: The T-45 aircraft structure is currently fatigue limited to 14,400 flight hours based on initial full-scale fatigue tests. This service life limit prevents the T-45 fleet from meeting Integrated Production Plan (IPP) past 2025. Studies demonstrate that the 14,400 flight hour service life can be extended, with a Service Life Extension Program (SLEP), to 21,600 flight hours, which will support meeting IPP until 2035. A T-45 Structural Service Life Assessment Program (SLAP) was completed in February 2012. In order for the T-45 to meet IPP until 2035, it is also necessary to assess the subsystems of the T-45 in their ability to remain viable. In FY13 an initial subsystem assessment, based on the updated fleet aircraft usage spectrum and future predicted training missions of the T-45 aircraft, found 79 dispositions requiring further analysis, teardowns, age explorations, recertification and/or testing . The assessment of the subsystems that make up these 79 dispositions will address all critical subsystems required and their ability to maintain IPP/NTR until 2035, analysis and studies will be conducted to outline improvements, assess manufacturing capabilities, prototype redesign and test of subsystems for trainer aircraft. 3384: MH-60 SLAP is assessing the primary aircraft structure and subsystem condition of the MH-60S fleet in order to evaluate the airframe's ability to meet its designed service life of 10,000 hours. SLAP will determine the efforts necessary to extend the aircraft design life limits to meet Chief of Naval Operations (CNO) operational inventory requirements through FY 2035. Without SLAP, aircraft will be retired from USN inventory when design service life limits are reached, directly impacting Surface Warfare, Personnel Recovery, Special Operations Forces (SOF) Support, Mine Countermeasures, and Combat Logistics operational capabilities and capacity. The fatigue analysis and dispositions for safety critical items will continue to be further refined throughout SLAP effort, augmented with aircraft, specific system and wiring teardowns, inspections, and tests; data analysis; and development of models and tools, producing results that will inform SLEP activity. Design and development engineering will be performed to develop an Engineering Change Proposal (ECP) for a SLEP solution. Additionally, a plan will be developed to convert the MH-60S Block 1 aircraft to Block 3B aircraft, extending the mission profile for these aircraft and ultimately providing the fleet with more flight hours. 9999: FY 2019 Congressional Add funds MH-60S analysis and development of the 401D engine; the procurement of MH-60 alignment, tail cone, and pylon fixtures to support SLAP analysis, development of engineering technical data, drawings/models and associated lists from the Original Equipment Manufacturer (OEM) in support of SLAP deep look inspections. FY 2020 Congressional Add funds the continuation of aircraft historical regime and usage data assessment, airframe external loads analysis and fatigue analysis. Continue development of initial dispositions for safety critical items. JUSTIFICATION FOR BUDGET ACTIVITY: This program is funded under OPERATIONAL SYSTEMS DEVELOPMENT because it includes development efforts to upgrade systems that have been fielded or have received approval for full rate production and anticipate funding in the current or subsequent fiscal year.
Document Details
- Document Type
- R2 Budgetary Justification
- Publication Date
- Oct 01, 2021
- Source ID
- 0702207N_7_1319_PB_2021
- Change Summary Explanation
- Technical: PU 3030: N/A PU 3182: Decrease from FY2020 to FY 2021 accounts for the availability of prior year execution balances. PU 3384: Increase from FY2020 to FY2021 to design and develop a plan to convert the MH-60S Block 1 aircraft to Block 3B aircraft and to design and develop an ECP for a SLEP solution. Schedule: PU 3030: EA-18G schedule changes capitalize on lessons learned from the F/A-18E/F SLAP analysis. This includes efficiencies and synergies gained from overlapping phases, as well as actual time required to conduct each phase. Schedule changes reflect the commencement of EA-18G Phase A analysis in FY2018 vice FY2019, the onset of EA-18G Phase B analysis changed from 1stQFY20-4QFY23 to 1QFY21-4thQ2025, and the EA-18G Phase C analysis is now planned to begin in 1QFY23-4thQFY25 instead of 4QFY23-4thQFY24. PU 3182: Schedule updated to provide detailed schematic display of major program milestones, to include: contracting activities, engineering milestones, acquisition approvals, test and evaluation events, and other applicable program milestones. PU 3384: Changes to the schedule to reflect the conversion of the MH-60S Block 1 to Block 3B Aircraft to extend the mission profile, ECP Development, and extended Fatigue Life Assessment (FLA) to conduct refined analysis based on initial results. FLA end date changed from 2QFY2022 to 4QFY2024. PU 9999: Changes to the schedule to reflect the addition of Tired Wiring to begin 4QFY2019 and FY 2020 efforts for FLA Follow-On and Block 1 to Block 3 Conversion.
- Service Agency Name
- Navy
Entities
Organizations
- United States Navy
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