Glossary
Part 135, in plain language.
208 terms you'll meet on this site and in your operation: the regulations, the ramp, the crew room, the SMS and the hangar. Each has its own link you can share.
- Regulatory · 36
- Operations · 30
- Crew · 15
- Safety · 38
- Maintenance · 55
- Platform · 25
- Money · 9
Terms starting with 0–9
- 3-year TCOTotal cost of ownershipMoney
- Total cost of ownership over three years: subscriptions, add-ons, onboarding, integrations and the staff time spent re-keying data between systems.
Terms starting with A
- A&PAirframe and Powerplant mechanicMaintenance
- An FAA-certificated mechanic with airframe and powerplant ratings.See IA
- AAIPApproved Aircraft Inspection ProgramRegulatory
- An inspection program the operator writes and the FAA approves for a specific aircraft type, as an alternative to the manufacturer's program.135.419
- AC 120-78BAdvisory Circular 120-78BRegulatory
- FAA guidance on electronic signatures, electronic record-keeping and electronic manuals. Signatures that follow it hold up in an inspection.See E-signature
- AC 120-92DAdvisory Circular 120-92DRegulatory
- The FAA advisory circular that explains how to build and run a safety management system under Part 5.
- ACHAutomated Clearing HouseMoney
- The US bank-to-bank transfer network.
- ADAirworthiness DirectiveMaintenance
- A mandatory FAA order to inspect or fix a known unsafe condition on an aircraft, engine, propeller or part, by a deadline.See EAD, AMOC, Effectivity
- AEAccountable ExecutiveSafety
- The one person ultimately accountable for the SMS and its resources, often the owner.
- Aircraft maintenance logRegulatory
- The log carried aboard where crew record mechanical irregularities, and where the corrective action or deferral is entered before the next flight.135.65See Squawk
- AirworthinessMaintenance
- Whether an aircraft conforms to its approved design and is in condition for safe operation.
- AMOCAlternative Method of ComplianceMaintenance
- An FAA-approved different way to satisfy an Airworthiness Directive than the one written in it.See AD
- Anonymous reportSafety
- A safety report whose sender is never recorded. In a small company the details can still identify the reporter.
- AOGAircraft on groundOperations
- An aircraft unexpectedly grounded and unable to fly until a part or repair arrives.
- APIApplication programming interfacePlatform
- A way for software to exchange data automatically. Direct2's REST API is the same one its modules use.See Webhook
- ASAPAviation Safety Action ProgramSafety
- A voluntary FAA program where employees report safety issues under an agreement that limits enforcement. It needs an MOU with the FAA and is reviewed by an Event Review Committee (ERC). It is separate from confidential reporting.
- ATA chapterMaintenance
- The industry numbering of aircraft systems (for example, 32 is landing gear). Defects grouped by chapter show repeat problems.
- Audit logPlatform
- An append-only history of every change, with who, when, and the before and after values. It can't be quietly edited.
Terms starting with B
- Back-to-birthMaintenance
- The complete, traceable history of a life-limited part from manufacture to today. Without it, the part's remaining life can't be proven.
- BEWBasic empty weightOperations
- The weight of the aircraft itself, with its fixed equipment and unusable fuel, before crew, passengers, bags and usable fuel.See Reweigh
- Block timeOperations
- Time from the aircraft first moving for the flight until it stops at the destination (out to in). Commonly used for billing.
- BrokerOperations
- An intermediary who sells charter to a client and books the flight with an operator.See Part 295, Wholesale rate
Terms starting with C
- C of CCertificate of ConformityMaintenance
- A supplier's statement that a part conforms to its order and specification.
- CAMPContinuous Airworthiness Maintenance ProgramRegulatory
- The detailed maintenance program the FAA requires for aircraft with 10 or more passenger seats. Here it always means the regulatory program.135.411(a)(2)See Maintenance regimes, CASS
- CASSContinuing Analysis and Surveillance SystemRegulatory
- The operator's own check that its maintenance program is working, by watching failures, delays and trends. Required alongside a continuous airworthiness maintenance program.135.431See CAMP
- CDLConfiguration Deviation ListMaintenance
- An approved list of external parts, such as a panel or fairing, the aircraft may fly without, usually with a performance penalty.
- Certificate holderRegulatory
- The company the FAA has authorized to fly charter. It holds operational control of every flight and the responsibility for regulatory compliance.
- CFRCode of Federal RegulationsRegulatory
- The Code of Federal Regulations. Aviation rules are Title 14, cited like "14 CFR 135.267" (Part 135, section 267).
- CGCenter of gravityOperations
- Center of gravity: the balance point of the loaded aircraft. It must stay within limits for the aircraft to be controllable.See Envelope
- Chief pilotCrew
- The senior pilot responsible for pilot standards, training and checks.
- CMOCertificate Management OfficeRegulatory
- An FAA office dedicated to overseeing one or a few larger certificate holders, instead of a FSDO.
- Competency checkCrew
- The recurring check of a charter pilot's knowledge and skill in the aircraft type.135.293
- Confidential reportSafety
- A safety report where the reporter's identity is recorded but visible only to the people the company designates. Part 5 requires a confidential reporting system.See Anonymous report, ASAP
- Configured baselinePlatform
- The point where your SMS is set up: signed policy, roles, FRAT model, live reporting and assigned training. Real activity then makes it operating.
- Configured vs. operatingSafety
- An SMS can be set up in software (configured) without being in use (operating). A reporting system with no reports doesn't count as operating.
- CPACorrective/Preventive ActionSafety
- A tracked fix for a safety problem, with an owner and a due date.
- CurrencyCrew
- Whether a pilot's required checks, training, medical and recent flying are up to date. A lapsed item blocks assignment to a charter leg.See Recency, Grace month
- Cut-overPlatform
- The signed, dated moment a record moves from the old system to Direct2 as the system of record.
Terms starting with D
- D095OpSpec D095Regulatory
- The OpSpec paragraph that authorizes an operator to use a minimum equipment list, and sets how deferrals and extensions are handled.
- Data buildMaintenance
- Loading and checking one aircraft's times, inspections, directives and parts from its records into a new system.See Cut-over
- Declaration of ComplianceRegulatory
- The operator's signed statement to its FSDO or CMO that its SMS meets Part 5, due May 28, 2027. The FAA acknowledges a Declaration; it does not approve it, and it can ask for supporting data at any time.§5.9See Part 5, Readiness indicator
- DeferralMaintenance
- A decision to fly with an inoperative item until a set deadline, as the MEL, CDL or NEF program allows. An expired deferral grounds the aircraft.See MEL categories, Placard
- Demo operatorPlatform
- A fully populated sample operator with aircraft, crews, trips, FRATs and maintenance history, for exploring the product.
- DepositMoney
- Money a client pays before a trip, by card or ACH, credited on the final invoice.See ACH
- Director of MaintenanceDOMMaintenance
- The person in charge of keeping the aircraft airworthy and the maintenance records correct.
- Director of OperationsDOCrew
- The manager in charge of flight operations. Holds operational control and authorizes flight releases.
- Dispatch gateSafety
- A check that must clear before a flight can be released, such as a signed FRAT, a legal crew or an airworthy aircraft.
- DRSDynamic Regulatory SystemMaintenance
- The FAA's online library of Airworthiness Directives, type data and guidance.
- Dual-hattingSafety
- One person holding several roles, for example owner, Accountable Executive and Director of Operations. Common at small operators.
- Due listMaintenance
- Every inspection, directive and part replacement coming due on an aircraft, sorted by how soon.See Forecast
- Duty and rest limitsRegulatory
- Federal limits on how long pilots may fly and be on duty, and how much rest they need. On-demand limits are in 135.267; 135.263 sets the general rules.
- Duty periodCrew
- The time a crew member is on duty for the operator, from reporting until released.
Terms starting with E
- E-signaturePlatform
- An electronic signature tied to a named person and the exact record they signed, following AC 120-78B.See AC 120-78B
- EADEmergency Airworthiness DirectiveMaintenance
- An urgent Airworthiness Directive that takes effect on receipt, often grounding the aircraft until the action is done.See AD
- eAPISElectronic Advance Passenger Information SystemRegulatory
- The US Customs and Border Protection system where passenger and crew details are filed before an international flight. A General Declaration (GenDec) form may also be required.
- Effective-dated rule setPlatform
- Regulations as encoded in the software, kept with effective dates so you can show which rule applied on the day of a flight.
- Effectiveness verificationSafety
- Proof that a corrective action actually worked, before it is closed.§5.75
- EffectivityMaintenance
- Which serial numbers and configurations an AD, bulletin or task applies to.
- Empty legOperations
- A positioning flight offered for sale, usually at a discount.See Positioning leg
- Engine hourly programMaintenance
- A pay-by-the-hour engine maintenance program from an engine maker or provider. The operator reports hours and follows the program's tasks.
- Engine trend monitoringMaintenance
- Regular engine readings compared over time to catch wear early.
- EnvelopeOperations
- The approved range of weight and center of gravity, often drawn as a shape on a chart. The loaded aircraft must fall inside it.See CG
- ERPEmergency Response PlanSafety
- The operator's plan and call tree for an accident or serious incident.§5.27
- Exchange and coreMaintenance
- In an exchange, you receive a serviceable part and send your removed part (the core) back to the vendor.
- ExportPlatform
- Downloading your records as CSV, JSON or PDF at any time, including per-aircraft records, documents and audit trails.
- Extended restCrew
- Extra rest a crew member must receive when a duty period runs past its planned limits.
Terms starting with F
- Fail-safePlatform
- Stale, unknown or unreachable data shows red and blocks, never green. A late import can't make an aircraft look airworthy.
- FBOFixed-base operatorOperations
- The private terminal at an airport that sells fuel, parking and handling to business aircraft.
- FDM / FOQAFlight data monitoring / Flight operational quality assuranceSafety
- Analyzing data recorded on the aircraft to spot unsafe trends, such as unstable approaches or hard landings.
- Feasibility checkOperations
- Checking a requested trip against aircraft range and performance, crew duty, maintenance and airport limits before it is quoted.See Quote
- FETFederal Excise TaxMoney
- The federal excise tax on paid air transportation: a percentage of the amount paid plus a fee per passenger per flight segment, with exceptions. Positioning charges billed to the customer are part of the taxable amount.See Segment fee
- Flight followingOperations
- Tracking each flight's progress against its plan so an overdue or diverted aircraft is noticed quickly.See Flight locating
- Flight locatingRegulatory
- Knowing where each flight is and when it should arrive, and acting when it's overdue. Charter operators must have a flight-locating procedure.135.79See Flight following
- Flight timeCrew
- For pilots, the time from when the aircraft moves under its own power for flight until it comes to rest after landing. Crew flight-time limits count this.14 CFR 1.1See Block time, Time in service
- ForecastMaintenance
- A projection of when items on the due list will come due, based on planned flying.See Work package
- Form 337Major Repair and AlterationMaintenance
- The FAA form filed for a major repair or major alteration. It becomes part of the aircraft's permanent record.
- FRATFlight Risk Assessment ToolSafety
- A scored pre-flight risk checklist covering items such as weather, crew rest, airport and night. Above a set score, the flight needs a sign-off before release.See Dispatch gate, Mitigation
Terms starting with G
- GOMGeneral Operations ManualRegulatory
- The operator's General Operations Manual: its FAA-accepted procedures for running flights, including who may release a flight and how.
- Grace monthCrew
- A recurring check taken in the month before or after it is due counts as taken in the month it was due.135.301
- Guest accessPlatform
- A read-only login for an inspector or auditor that expires on a set date and keeps its own activity log.
Terms starting with H
- Hard time / on-conditionMaintenance
- Hard time means replaced at a fixed interval. On-condition means inspected and replaced only when it fails a check.
- HazardSafety
- A condition or object that could cause or contribute to an accident or incident.See Risk
- Hazard registerSafety
- The SMS master list of known hazards, each with its risk rating, controls, owner and status.
- HobbsMaintenance
- A meter in the aircraft that counts hours while the engine or electrical system runs. Used to cross-check entered times.
Terms starting with I
- IAInspection AuthorizationMaintenance
- An authorization that lets an A&P mechanic perform annual inspections and approve major repairs for return to service.
- ICAInstructions for Continued AirworthinessMaintenance
- The maintenance instructions that come with an aircraft, part or modification.
- IEPInternal Evaluation ProgramSafety
- Scheduled internal audits of the operation and the SMS.
- ImportPlatform
- Bringing records in from another system or a spreadsheet, validated row by row with a mapping preview and safe to re-run.See Export
- Initial and residual riskSafety
- Initial risk is the rating before controls; residual risk is the rating after them.
- Inspection export packagePlatform
- A one-click bundle of records for an inspector or auditor, for any date range.
- Interfacing personSafety
- An outside party whose work touches your operation: an FBO, fueler, contract shop, broker or airport.
- Interfacing person noticeRegulatory
- Telling an outside party whose work touches your operation, such as an FBO, fueler or contract shop, about a hazard they can address.§5.57See Interfacing person
- Invoice from actualsMoney
- An invoice built from what was actually flown and spent, rather than from the quote.
- IPCInstrument proficiency checkCrew
- The recurring check of a pilot's ability to fly under instrument flight rules.135.297
- IS-BAO, ARGUS, WyvernSafety
- Third-party safety audit standards. Charter buyers and brokers often ask for the operator's audit rating.
Terms starting with J
- Just cultureSafety
- The commitment not to punish anyone for reporting in good faith, while still holding people accountable for reckless acts.
Terms starting with L
- LegOperations
- One flight segment from takeoff to landing. Each leg carries its own operating rule, crew, times and checks.See Trip
- Legal holdSafety
- Stopping the deletion of records because of an investigation or litigation.
- Line checkCrew
- A check of a pilot in command flying a real or representative route.135.299
- LLPLife-limited partMaintenance
- A part that must be removed at a fixed number of hours or cycles, such as some engine discs.See Back-to-birth
- Load manifestRegulatory
- The required record of the aircraft's load before a multiengine flight: passengers, weights and center of gravity. It is prepared before takeoff and kept on file.
Terms starting with M
- (M) and (O) proceduresMaintenance
- Steps that must be done before flying with a deferred item: (M) by maintenance, (O) by the flight crew.
- Maintenance record entriesMaintenance
- The required content of maintenance and inspection entries: what was done, the date, and the name, certificate and signature of the person approving it.
- Maintenance recordsMaintenance
- The records an owner or operator must keep for each aircraft, including current status of life-limited parts, inspections and Airworthiness Directives.91.417
- Maintenance regimesRegulatory
- The two Part 135 maintenance paths, set by type-certificated passenger seats: 9 or fewer follow the manufacturer's program or an approved inspection program; 10 or more follow a continuous airworthiness maintenance program.
- Managed aircraftOperations
- An aircraft owned by a client and flown on the operator's certificate under a management agreement. The owner's own flights are usually Part 91.
- Management reviewSafety
- Leadership's periodic assessment of how the SMS is performing, with decisions recorded.§5.73(a)
- MELMinimum Equipment ListMaintenance
- The approved list of equipment that may be inoperative while the aircraft still flies, with conditions and time limits.See MMEL, MEL categories, D095
- MEL categoriesMaintenance
- The repair interval for a deferred item. Category A: as stated in the MEL item. B: 3 consecutive calendar days. C: 10. D: 120. The day of discovery doesn't count.See Deferral
- METAR / TAFOperations
- The standard aviation weather report (METAR, observed) and forecast (TAF) for an airport.
- MFAMulti-factor authenticationPlatform
- Signing in with a second proof, such as a code from an authenticator app, as well as a password.
- MISMechanical Interruption SummaryRegulatory
- A report to the FAA listing flights interrupted, or aircraft changed, because of a mechanical problem.135.417
- MitigationSafety
- An action that lowers risk, such as adding a second pilot or choosing a longer runway. Who must approve depends on the score band.See Risk band
- MLWMaximum landing weightOperations
- The heaviest the aircraft may be when it lands.
- MMELMaster Minimum Equipment ListMaintenance
- The manufacturer-level list the FAA approves for a type. An operator's MEL is built from it.
- MoCManagement of ChangeSafety
- A structured risk review before a change, such as a new aircraft type, destination or procedure.
- ModulePlatform
- Scheduling & Dispatch, Safety or Maintenance. Each runs on its own or alongside the others, on the same record.
- MTOWMaximum takeoff weightOperations
- The heaviest the aircraft may be at the start of the takeoff roll.
- MZFWMaximum zero-fuel weightOperations
- The heaviest the loaded aircraft may be before usable fuel is added.
Terms starting with N
- NASA ASRSAviation Safety Reporting SystemSafety
- NASA's voluntary, confidential reporting system. Filing within 10 days of an event can give a pilot limited protection from FAA penalty.
- NEFNonessential Equipment and FurnishingsMaintenance
- Cabin and convenience items, such as a reading light, that may be inoperative without affecting safety.
- Non-routine findingMaintenance
- A defect found during scheduled maintenance that wasn't on the plan.
- NOTAMNotice to Air MissionsOperations
- An official notice of a temporary change, such as a closed runway or an unlit tower. Crews check them before flying.
- NTSB Part 83049 CFR Part 830Regulatory
- The rule listing accidents and serious incidents that must be reported to the NTSB immediately, and how.
Terms starting with O
- OOOIOut, Off, On, InOperations
- The four times of a flight: out of the gate, off the ground, on the ground, in at the gate. They close a leg and feed billing, duty and maintenance times.
- Operational controlRegulatory
- The certificate holder's authority over starting, conducting and ending a flight, and its responsibility for doing so.135.77See Two-party release
- Ops boardOperations
- A timeline showing every aircraft's trips, maintenance blocks and conflicts at a glance.
- OpSpecsOperations SpecificationsRegulatory
- The FAA-issued pages that say exactly what an operator is authorized to do: aircraft, areas of operation, programs and permissions.See D095
- Owner holdOperations
- A block on the schedule that keeps a managed aircraft available for its owner.See Managed aircraft
- Owner statementMoney
- The monthly statement of charter revenue and costs on a managed aircraft, sent to its owner.
Terms starting with P
- Paper-primary vs. eLogMaintenance
- Whether the paper logbook or the electronic log is the official maintenance record for a given aircraft.
- Parallel runPlatform
- Running the old and new systems side by side so results can be compared before switching.
- Part 514 CFR Part 5Regulatory
- The FAA rule that requires Part 135 operators to run a safety management system with four components: safety policy, safety risk management, safety assurance and safety promotion.
- Part 5 applicantRegulatory
- An operator certificated after May 28, 2024. It must have an SMS in place before it is authorized to operate, rather than declaring later.§5.9(b)See Declaration of Compliance
- Part 9114 CFR Part 91Regulatory
- The general operating and flight rules every aircraft in the US follows. Owner flights, training and some positioning legs inside a charter operation may be flown under Part 91, which changes tax, duty and paperwork rules.See Part 135, Positioning leg
- Part 13514 CFR Part 135Regulatory
- The FAA rules for on-demand (charter) and commuter operations. They set stricter crew duty, maintenance, record-keeping and safety rules than private flying.
- Part 14514 CFR Part 145Maintenance
- An FAA-certificated repair station. Its work records must flow back into the operator's maintenance history.
- Part 29514 CFR Part 295Regulatory
- The US Department of Transportation rule for air charter brokers, including what they must disclose to customers.See Broker
- Phase inspectionMaintenance
- A large inspection split into smaller phases done at set intervals, so the aircraft isn't down for weeks at once.
- PICPilot in commandCrew
- The captain of a flight, with final authority over it. Accepts the release and signs the manifest.See SIC, Two-party release
- PlacardMaintenance
- A label placed on an inoperative control or instrument so the crew knows not to use it.
- PMIPrincipal Maintenance InspectorRegulatory
- The FAA inspector assigned to oversee an operator's maintenance program and records.See POI
- POIPrincipal Operations InspectorRegulatory
- The FAA inspector assigned to oversee an operator's flight operations.
- Positioning legOperations
- A flight with no paying passengers, flown to move the aircraft where it's needed. Also called a ferry or deadhead leg.
- Pre-buyMaintenance
- An inspection and records review before an aircraft is purchased.
Terms starting with Q
- QuoteOperations
- The priced trip proposal sent to a client or broker, including taxes and fees. An accepted quote becomes a trip.See RFQ, Feasibility check
Terms starting with R
- Read-and-signSafety
- Tracked acknowledgement that each person has read a specific revision of a document.
- Readiness indicatorPlatform
- Direct2's live Part 5 checklist, marking each element satisfied, partial or gap from real evidence. It is an indicator, not an FAA determination.
- RecencyCrew
- Recent-experience requirements, such as a minimum number of takeoffs and landings within a set period.See Currency
- Rest periodCrew
- Time free of all duty. The rules set a minimum rest before the next duty period.See Duty period
- Return to serviceMaintenance
- The signed approval that an aircraft is airworthy again after maintenance. Until it is signed, the aircraft may not fly.135.443See Maintenance record entries
- Reweigh36-month weighing ruleRegulatory
- A multiengine aircraft needs a current empty weight and center of gravity, re-established at least every 36 calendar months.135.185See BEW
- RFQRequest for quoteOperations
- A request for a price on a trip, from a client or broker, by phone, email or marketplace.See Quote
- RIIRequired Inspection ItemMaintenance
- A maintenance task so safety-critical that a second, specially authorized person must inspect it.
- RiskSafety
- The predicted severity and likelihood of harm from a hazard.See Risk matrix
- Risk bandSafety
- A score range on a FRAT or risk matrix (for example low, elevated, high) that sets who must sign off.
- Risk matrixSafety
- A grid of severity against likelihood, often 5 by 5, used to rate a risk.
- RobbingMaintenance
- Taking a serviceable part from one aircraft to fix another. Also called cannibalization.
- RONRemain overnightOperations
- When an aircraft and crew stay overnight away from base during a trip.
- RotableMaintenance
- A component that is removed, repaired or overhauled and reused, often swapped through an exchange with a core returned.
Terms starting with S
- Safety assuranceSafety
- Monitoring whether risk controls actually work, through indicators, audits, investigations and corrective actions.
- Safety managerSafety
- The person who runs the SMS day to day: triages reports, keeps the hazard register and tracks corrective actions.
- Safety objectiveSafety
- A stated safety goal that the SMS measures with indicators.
- Safety policySafety
- The SMS component where leadership commits to safety, sets objectives, assigns accountability and plans emergency response.§5.21–5.27
- Safety promotionSafety
- SMS training and safety communication.§5.91–5.93See Read-and-sign
- SandboxPlatform
- A practice copy of your account for training, separate from live data.
- SB / SLService Bulletin / Service LetterMaintenance
- Notices from the aircraft or engine maker recommending an inspection or change. Usually optional unless an AD or the maintenance program makes them mandatory.
- SDRService Difficulty ReportRegulatory
- A report the operator sends the FAA about certain failures, malfunctions or defects found in service. Direct2 prefills and tracks it; the operator submits it.135.415
- Segment feeMoney
- The per-passenger, per-segment part of the federal excise tax on domestic air transportation. A segment is one takeoff and one landing.See FET
- SEIFRSingle-engine IFR (passenger-carrying)Regulatory
- Single-engine aircraft carrying passengers under instrument flight rules, such as a PC-12 or Caravan. The rules require an engine trend monitoring program for them.135.421See Engine trend monitoring
- Shadow modePlatform
- Direct2 computes an aircraft's due list in the background while your outside tracker stays official, and reports differences.See Parallel run
- SICSecond in commandCrew
- The co-pilot, required on aircraft or operations that need two pilots.See PIC, SIC concurrence
- SIC concurrenceSafety
- The second in command reviews and agrees with the FRAT the captain completed.
- SMSSafety Management SystemSafety
- A formal, company-wide way of managing safety risk, built on four components: safety policy, safety risk management, safety assurance and safety promotion.See Part 5, SRM, Safety assurance
- SMS records retentionRegulatory
- How long SMS records must be kept: risk controls as long as they're relevant, safety assurance records at least 5 years, training records for the length of employment, and safety communications 24 months.§5.97See Legal hold
- SMSVPSMS Voluntary ProgramRegulatory
- The FAA's earlier voluntary SMS program. Operators that joined it still have to submit a Part 5 Declaration.
- SOAPSpectrometric oil analysis programMaintenance
- Lab analysis of engine oil samples for metals that indicate wear.
- Source and freshnessPlatform
- Every value shows where it came from (Direct2, an outside system, or manual entry) and how old it is.See Fail-safe
- SPISafety Performance IndicatorSafety
- A number tracked over time to show whether safety is improving, tied to a safety objective.See Safety objective
- SquawkMaintenance
- A mechanical problem written up by a pilot or mechanic. Also called a discrepancy.
- SRMSafety Risk ManagementSafety
- Describing the system, then identifying hazards and analyzing, assessing and controlling the risk they create.§5.51–5.57See Hazard, Risk matrix
- SSOSingle sign-onPlatform
- Signing in with your company's existing account instead of a separate password.
- Status pagePlatform
- A public page showing the current availability of the platform and its integrations.
- STCSupplemental Type CertificateMaintenance
- FAA approval for a change to an aircraft's original design, such as an avionics upgrade.See ICA
- SubcharterOperations
- Selling a trip on another operator's aircraft and certificate.
- SUPSuspected Unapproved PartMaintenance
- A part that may not meet approved standards or lacks proper documentation. It must be quarantined and reported.
- Superseding entryMaintenance
- A new record entry that corrects an earlier one. The original stays visible.
- System of recordPlatform
- The system that holds the official version of a record, for example an aircraft's maintenance status.See Cut-over
Terms starting with T
- Task cardMaintenance
- Step-by-step instructions for one maintenance task, with sign-off boxes.
- Tenant isolationPlatform
- Each operator's data is kept separate from every other operator's, at the application and database layers.
- TFRTemporary Flight RestrictionOperations
- Airspace temporarily closed or restricted, for example around a wildfire or a VIP visit.
- Time in serviceMaintenance
- For maintenance, the time from when the aircraft leaves the surface until it touches down. Inspections and part lives run on it.14 CFR 1.1See Flight time, Hobbs
- TripOperations
- A booked itinerary: client, aircraft, crew and one or more legs, from quote to invoice.See Leg
- Trip sheetOperations
- The itinerary document for a trip, in versions for the crew, the client and the FBO.
- TSA Twelve-FiveTwelve-Five Standard Security ProgramRegulatory
- The TSA security program for aircraft over 12,500 lb in charter service, including passenger checks and a criminal history records check (CHRC) for crew.
- TSN / CSN / TSOMaintenance
- Time since new, cycles since new and time since overhaul: the counters that show how much life a component has used.
- Two-party releaseOperations
- Before a leg departs, the Director of Operations or a delegate authorizes the flight and the pilot in command accepts it. Both are required.135.77See Operational control, Dispatch gate
- Type ratingCrew
- A pilot certificate endorsement to fly a specific large or jet aircraft model.
Terms starting with W
- W&BWeight and balanceOperations
- Weight and balance: the calculation that the loaded aircraft is within its weight limits with its center of gravity inside the envelope.See CG, Envelope, Load manifest
- WebhookPlatform
- A message Direct2 sends to another system the moment something happens, instead of waiting to be asked.
- Whichever firstMaintenance
- A maintenance item due at hours, cycles or a calendar date, whichever comes first.
- Wholesale rateMoney
- The discounted rate an operator offers brokers.See Broker
- Work orderMaintenance
- The job record for a maintenance visit: tasks, parts, labor and sign-offs.See Task card
- Work packageMaintenance
- The group of due items planned for one maintenance visit.See Work order
Definitions are plain-language summaries for readers new to a term, not legal interpretations. The regulation text governs. Missing a term? Tell us.
See the terms working on a real trip.
In the demo, every rule on this page shows up where it applies: on the release, the due list, the FRAT and the readiness tracker.