Federal Aviation Administration Authorization Act of 1993 - Amends the Airport and Airway Improvement Act of 1982 (the Act) to authorize appropriations for FY 1994 for airport development and airport planning projects. Earmarks specified amounts to a discretionary fund under certain circumstances. (Sec. 3) Makes the acquisition or installation by a public-use airport of explosive detection devices and universal access systems an "airport development" activity. (Sec. 4) Authorizes the Secretary of Transportation (Secretary) to continue issuing letters of intent with respect to the obligation of funds for airport development projects. (Sec. 5) Directs the Secretary to establish a program to purchase and reserve an inventory of precision approach instrument landing system equipment for installation at airports. Prohibits the use of airway improvement funds for the development or procurement of microwave landing systems, except as necessary to meet Government contracts in effect on January 1, 1994. (Sec. 7) Amends the Federal Aviation Act of 1958 to authorize the Administrator of the Federal Aviation Administration (FAA) to provide safety-related training and operational services to foreign aviation authorities, with or without reimbursement, if such services promote aviation safety. Authorizes the Administrator to collect fees for providing as a service any test, authorization, certificate, permit, rating, evaluation, approval, or review outside of the United States. (Sec. 9) Directs the Administrator to review the FAA's personnel administration, procurement process, and overall organization structure. (Sec. 11) Prohibits the Administrator of the FAA from publishing, or contracting with any other organization for the publishing of, the "Aviation Safety Journal." (Sec. 12) Amends the Federal Aviation Act of 1958 to prohibit the Secretary from taking a slot at a high density airport from a domestic air carrier and awarding it to a foreign air carrier if it is determined that domestic air carriers are not provided equivalent rights of access to the foreign air carrier's airport. (Sec. 13) Prohibits an air carrier from terminating air transportation from a nonhub airport unless it gives at least 60 days notice to the Secretary. Sets forth certain exceptions. Sets forth civil penalties for violating this prohibition. (Sec. 14) Authorizes the Administrator to enter into cooperative agreements with Federal and non-Federal entities to promote aviation research, engineering, and development, including the development of prototypes and demonstration models. (Sec. 15) Directs the Secretary to study the safety of the approaches to the Juneau International Airport, Alaska. (Sec. 16) Authorizes the Secretary to grant releases from any of the terms, conditions, reservations, and restrictions contained in the conveyance of certain U.S. property for airport purposes to the cities of Soldotna, Alaska, and Rolla, Missouri. (Sec. 18) Authorizes the Administrator to grant release from any of the terms, conditions, reservations, and restrictions contained in the conveyance of certain U.S. property to Palm Springs, California, for airport purposes. (Sec. 19) Amends the Aviation Safety and Noise Abatement Act of 1979 to provide for projects to soundproof residential buildings if specified conditions are met. (Sec. 20) Requires compensation received by the United States from the transfer of the San Jacinto Disposal Area to the City of Galveston, Texas, to include compensation to the FAA for costs to replace existing airway facilities on such area. (Sec. 21) Requires the Secretary to provide for weather observation services, including direct radio contact between weather observers and pilots, at Augusta State Airport, Maine. (Sec. 22) Directs the Administrator to study the effectiveness of restraint systems that may offer protection for children carried in the lap of an adult aboard an aircraft or provide for the attachment of such systems to the aircraft. (Sec. 23) Exempts the State of Hawaii from the prohibition against regulating intrastate air transportation. Deems a passenger commencing and terminating air transportation in Hawaii an intrastate passenger. Deems to be an interstate passenger any passenger moving as part of a single itinerary on a single ticket beginning or ending outside Hawaii. (Sec. 25) Authorizes expenditures from the Airport and Airway Trust Fund.