model will take into consideration forecasted attrition. (4) Consultation In revising the model, the Administrator shall consult with interested persons, including the exclusive collective bargaining representative for aviation safety inspectors certified under section 7111 of title 5, United States Code. 525. Safety critical staffing (a) Implementation of staffing standards for safety inspectors Upon completion of the revised staffing model for aviation safety inspectors under section 524, and validation of the model by the Administrator, the Administrator shall take all appropriate actions in response to the number of aviation safety inspectors, aviation safety technicians, and operation support positions that such model determines are required to meet the responsibilities of the Flight Standards Service and Aircraft Certification Service, including increasing the number of safety critical positions in the Flight Standards Service and Aircraft Certification Service per fiscal year as appropriate, provided that such staffing increases shall be measured relative to the number of persons serving in safety critical positions as of September 30, 2023. Any increase in safety critical staffing pursuant to this subsection shall be subject to the availability of appropriations. (b) Safety critical positions defined In this section, the term safety critical positions means— (1) aviation safety inspectors, aviation safety specialists (1801 series), aviation safety technicians, and operations support positions in the Flight Standards Service