- ITAR
- The International Traffic in Arms Regulations (22 CFR 120-130), administered by the State Department, controlling defense articles, defense services and related technical data. In aerospace it is the first filter on every public claim: if a capability is USML-controlled, describing it in detail on a website can itself be an export.
- USML categories
- The United States Munitions List, organized into 21 categories. Category IV covers launch vehicles, missiles and rockets; Category XV covers spacecraft and related articles. Knowing which category a product falls under determines the licensing path and what may be said publicly.
- DDTC registration
- Registration with the Directorate of Defense Trade Controls is mandatory for any US person who manufactures, exports or brokers defense articles — required even if the company never exports. Registration is annual, and prime contractors routinely ask suppliers to prove it before awarding work.
- EAR and the CCL
- The Export Administration Regulations, administered by Commerce BIS, cover dual-use items on the Commerce Control List. Most commercial satellites and many components moved from the USML to the EAR's 9x515 ECCNs, which is why some space hardware is EAR-controlled and some is still ITAR — and why 'we're not ITAR' does not mean 'unregulated'.
- Deemed export
- Releasing controlled technical data to a foreign national inside the United States counts as an export to that person's home country. This is why a design review, a shop-floor tour, a shared drive or a screen visible to a non-US-person employee can be a violation without anything crossing a border.
- TAA and MLA
- A Technical Assistance Agreement authorizes sharing controlled technical data or defense services with foreign parties; a Manufacturing License Agreement authorizes foreign production. Both require State Department approval, take months, and shape which international partnerships are realistically available.
- Foreign person restrictions
- Access to ITAR-controlled data is limited to US persons (citizens, permanent residents and certain protected individuals) absent a license. It constrains hiring, contractor staffing, cloud and IT architecture, and even which vendors can be in a building.
- Public domain / fundamental research exclusion
- Information already published and generally accessible, and the results of basic university research intended for publication, fall outside ITAR technical-data controls. This is the narrow legal doorway through which aerospace companies publish anything at all — and it does not retroactively cover controlled data that was published by mistake.
- Export-control review of public content
- The practical discipline of running marketing copy, spec sheets, imagery, conference talks and job postings past an empowered official before release. Safe material is generally market-facing (missions served, certifications held, capacity, heritage); risky material is design detail, performance parameters, test data and process know-how.
- TRL and MRL
- Technology Readiness Level (1-9) rates how proven a technology is, from basic principles to flight-proven in an operational mission. Manufacturing Readiness Level rates whether it can actually be produced at rate and quality. Government customers use both as gates, and 'TRL 6' or 'TRL 9' is a claim buyers will ask you to substantiate.
- PDR and CDR
- Preliminary Design Review freezes the architecture and shows the design can plausibly meet requirements; Critical Design Review shows the detailed design is complete enough to build. Passing these gates on schedule is the milestone language government programs are actually managed in.
- FRR
- Flight Readiness Review — the final formal gate before launch or flight, where every open item, waiver and anomaly is dispositioned. Referenced alongside the Launch Readiness Review that immediately precedes a launch attempt.
- Qualification vs acceptance testing
- Qualification testing is run to margin, beyond expected flight levels, on a dedicated unit to prove the design. Acceptance testing runs each flight unit at flight levels to prove workmanship. Protoflight blends the two on a single article when schedule or budget will not support a separate qual unit.
- EMI/EMC
- Electromagnetic interference and compatibility — proving a unit neither emits enough energy to disturb its neighbors nor fails in their presence. On a densely packed spacecraft or aircraft, EMC problems surface late and are expensive to fix.
- Thermal vacuum (TVAC) testing
- Cycling hardware through hot and cold extremes in a vacuum chamber to simulate orbit, verify thermal design and bake out contaminants. Chamber time is a genuine national bottleneck and often the pacing item in a satellite schedule.
- Vibration and acoustic testing
- Shaking hardware to the launch vehicle's predicted random-vibration and sine environments, and blasting it with acoustic noise to reproduce liftoff. Most flight hardware failures found on the ground are found here.
- Mass margin
- Reserve mass held against growth as a design matures. Programs start with generous margin and lose it steadily; when margin goes negative, the choice is redesign, a bigger launch vehicle or descoped payload. It is the single number most likely to reshape a program.
- Delta-v
- The change in velocity a vehicle can produce, the fundamental currency of orbital mechanics. Every maneuver — orbit raising, plane change, stationkeeping, deorbit — spends from a fixed delta-v budget set by propellant and specific impulse.
- Specific impulse (Isp)
- Propulsion efficiency, measured in seconds — thrust produced per unit of propellant consumed per second. Chemical engines land roughly in the 250-460 second range; electric propulsion is an order of magnitude higher but produces very low thrust, trading months of transfer time for enormous propellant savings.
- Payload capacity to LEO/GTO
- How much mass a launch vehicle can place in low Earth orbit versus geostationary transfer orbit. GTO capacity is far lower than LEO for the same rocket, and quoted numbers always carry assumptions about inclination, altitude and whether the booster is recovered.
- Rideshare vs dedicated launch
- Rideshare buys a slot on someone else's mission — cheap, but the orbit, timing and separation sequence are not yours. A dedicated launch costs far more and buys control of orbit, schedule and deployment. The tradeoff drives most smallsat program planning.
- ESPA ring
- The EELV Secondary Payload Adapter — a structural ring with standardized ports that lets secondary payloads fly on a primary mission. ESPA and ESPA Grande classes became a de facto sizing standard for a whole category of smallsats.
- CubeSat and smallsat form factors
- The CubeSat standard is built from 10 cm units (1U), scaling to 3U, 6U, 12U and beyond; smallsat generally means under about 500 kg. Standard form factors mean standard dispensers and predictable rideshare pricing, which is what made the category economically viable.
- Bus vs payload
- The bus provides the housekeeping — structure, power, propulsion, attitude determination and control, thermal, command and data handling. The payload is the revenue-earning instrument. Vendors specialize on one side or the other, and the interface between them is where integration risk concentrates.
- Constellation
- A coordinated group of satellites operated as one system to deliver coverage no single satellite can. Design parameters are the number of planes, satellites per plane, altitude and inclination, which together set revisit rate, latency and coverage gaps.
- LEO / MEO / GEO
- Low Earth orbit (roughly 160-2,000 km) gives low latency and high resolution but fast passes and short satellite lifetimes. Medium Earth orbit hosts navigation constellations. Geostationary orbit at about 35,786 km holds a fixed position over the equator, ideal for broadcast and wide-area comms but with high latency and expensive access.
- ITU filing and orbital slot coordination
- International spectrum and geostationary slot rights are coordinated through the International Telecommunication Union via national administrations, on a first-filed basis with bring-into-use deadlines. Filings are strategic assets that can predate a spacecraft by years.
- FCC license
- US commercial satellite operators need FCC authorization to transmit — Part 25 for most communications satellites, with a streamlined small-satellite path, plus earth station licensing and, for experimental work, Part 5. The FCC's Space Bureau also enforces orbital debris mitigation as a licensing condition.
- FAA Part 450 launch and reentry license
- The performance-based licensing rule from the FAA's Office of Commercial Space Transportation governing commercial launch and reentry, covering safety analysis, public risk criteria, flight safety systems and environmental review. Licensing timelines are a real business risk, and Part 450's implementation has been actively contested by industry.
- Deorbit and the five-year rule
- The FCC's orbital-debris rule requires most LEO satellites licensed after its adoption to deorbit within five years of mission completion, replacing the long-standing 25-year guideline. It changes propellant budgets, disposal design and end-of-life planning for every constellation.
- Space debris and conjunction assessment
- Tracking the catalogued objects in orbit, screening for close approaches and executing avoidance maneuvers. Operators receive conjunction data messages, and the US is transitioning civil space traffic coordination to a Commerce Department system, moving the function out of the military.
- Ground segment
- Everything on the ground — antennas and teleports, modems, mission operations centers, scheduling, and the networks and cloud services that move data. Ground-station-as-a-service now lets operators rent global antenna access instead of building it, changing the capital profile of a constellation.
- TT&C and downlink
- Telemetry, Tracking and Command is the housekeeping link that reports spacecraft health and uplinks commands; downlink is the higher-rate path that returns mission data. Available downlink capacity, not sensor capability, is frequently what caps how much a satellite can actually deliver.
- AS9100
- The aerospace quality management standard, built on ISO 9001 with added requirements for configuration management, risk, counterfeit-part prevention, first article inspection and product safety. Certification is registered in the industry's OASIS database and is effectively a precondition for supplying a prime.
- NADCAP
- Industry-managed accreditation for special processes — heat treating, welding, non-destructive testing, chemical processing, coatings, composites — administered by the Performance Review Institute. Primes require it for those processes, and it audits the process itself rather than the company's paperwork.
- DO-178C and DO-254
- The certification guidance for airborne software (DO-178C) and complex electronic hardware (DO-254), with Design Assurance Levels A through E scaled to how catastrophic a failure would be. DAL A evidence is enormously more expensive to produce than DAL D, and that cost difference shapes avionics architecture decisions.
- Type certificate and STC
- An FAA type certificate approves an aircraft, engine or propeller design. A Supplemental Type Certificate approves a major modification to an already-certified product — the usual route for retrofits, new avionics and special mission conversions, and a durable revenue asset for the holder.
- MRO and PMA parts
- Maintenance, Repair and Overhaul is the aftermarket that sustains fleets for decades. Parts Manufacturer Approval lets a company produce replacement parts without owning the original type certificate, creating an alternative to OEM pricing that OEMs resist commercially.
- Cost-plus vs firm-fixed-price
- Cost-plus contracts reimburse allowable costs plus a fee and suit genuine development uncertainty; firm-fixed-price puts overrun risk on the contractor and suits well-understood production. The government's shift toward fixed-price for development work has produced large losses on several major aerospace programs.
- OTA (other transaction authority)
- A contracting mechanism outside the Federal Acquisition Regulation used for prototypes and research, often through consortia, with faster timelines and terms friendlier to commercial and venture-backed companies. A successful prototype OTA can transition to production without full recompetition.
- SBIR / STTR
- Small Business Innovation Research and its technology-transfer sibling fund early technology in phases — feasibility, prototype, then commercialization without further SBIR dollars. For small aerospace firms these are the standard on-ramp to defense and NASA work and to a first past-performance record.
- IDIQ
- Indefinite Delivery, Indefinite Quantity — a multi-year umbrella contract under which specific task or delivery orders are competed among awardees. Winning a seat on the vehicle is necessary but not sufficient; the real revenue comes from task-order wins.
- Bid protest
- A formal challenge to an award, filed with the agency, the GAO or the Court of Federal Claims. Protests can suspend performance for months, and their frequency on large space and defense awards makes schedule assumptions in a bid genuinely uncertain.
- CMMC
- The Cybersecurity Maturity Model Certification program requires defense contractors handling federal contract information or controlled unclassified information to demonstrate specified security practices — self-assessment at Level 1, third-party assessment at Level 2 for most CUI. It is being phased into DoD contracts, and it reaches deep into small suppliers who previously self-attested.
- DCAA audit
- Defense Contract Audit Agency review of a contractor's accounting system, indirect rates, incurred costs and timekeeping. An adequate accounting system is a prerequisite for cost-reimbursable work, and building one is a real barrier for commercial companies entering defense.
- Program of record
- A funded, budgeted line in the government's long-term plan, as opposed to a demonstration or a one-off prototype. Becoming a program of record is the transition from episodic revenue to durable revenue, and it is the milestone investors in defense tech watch most closely.
- Prime vs sub
- The prime contractor holds the contract with the government and carries systems responsibility; subcontractors supply assemblies, components and services beneath it. Primes control requirements flowdown, and subs must satisfy quality, cybersecurity and export-control obligations passed down through the chain.
- Offset agreement
- A commitment to invest in, produce in, or transfer technology to a foreign buyer's country as a condition of an international defense sale. Offsets can approach or exceed the contract's value in obligation terms and heavily influence where global aerospace work is located.