Glossary

Industrial aviation glossary

Over 50 professional terms explained: maintenance, recycling, cargo conversion, storage, regulation. The full vocabulary to understand AéroNéo and the sector's international standards.

Maintenance & MRO

24 terms

MRO: Maintenance, Repair and Overhaul — every technical service on an aircraft.
B1: EASA Part-66 license — airframe, engines and mechanical/electrical systems mechanic.
B2: EASA Part-66 license — avionics and electronic systems technician.
A-check: Light maintenance check every 400-600 cycles or 2-3 months. External inspection, system checks, minor work.
C-check: Heavy check every 20-24 months. Deep structural inspection, 1-2 weeks in hangar.
D-check: Full overhaul every 6-10 years. Near-complete teardown, up to 2 months out of service.
EWIS (Electrical Wiring Interconnection System): Aircraft electrical wiring interconnection system, covering all harnesses, connectors and terminations. Subject to a dedicated inspection program (EZAP) mandated by ANAC in Algeria, EASA and FAA to prevent age-related degradation.
CASS (Continuing Analysis and Surveillance System): Continuing analysis and surveillance system required by FAA and transposed by Algerian ANAC, designed to permanently assess the effectiveness of an operator's maintenance program. Detects failure trends and adjusts intervention thresholds.
LRU (Line Replaceable Unit): Modular equipment designed to be replaced directly on the flight line, without specialized tooling or heavy removal. Key concept of modern maintainability, reducing AOG downtime through quick swap.
SRU (Shop Replaceable Unit): Internal sub-assembly of an LRU, only replaceable in a controlled shop environment. Essential distinction in the maintenance strategy between line interventions and specialized shops, per OEM CMM.
BITE (Built-In Test Equipment): Self-diagnostic system integrated into most modern avionics computers. Enables automatic fault detection, fault code storage and consultation by the technician via a dedicated maintenance terminal.
MEL (Minimum Equipment List): Minimum list of operative equipment required to authorize a flight. Established by the OEM (MMEL) then customized by the operator and approved by ANAC in Algeria. Defines deferred maintenance conditions and time limits.
CDL (Configuration Deviation List): List of tolerated external configuration deviations on an aircraft (missing panels, removed fairings) with associated performance penalties. OEM document integrated into the operational documentation.
ETOPS (Extended-range Twin-engine Operational Performance Standards): Regulation allowing twin-engine aircraft to operate long-distance flights beyond a certain distance from a diversion airport. Requires an enhanced maintenance and reliability program approved by the authority (ANAC, EASA, FAA).
GSE (Ground Support Equipment): Set of ground servicing equipment required for airport operations: pushback tractors, GPU, stairs, apron buses, de-icers, baggage loaders. Subject to a specific maintenance plan distinct from that of aircraft.
OEM (Original Equipment Manufacturer): Original equipment manufacturer of an aircraft or component (Airbus, Boeing, ATR, Embraer, Safran, Honeywell, Rockwell Collins). Issues the reference maintenance documentation (AMM, CMM, IPC, SB) binding on the entire maintenance chain.
Boroscopie: Endoscopic visual inspection of internal areas inaccessible inside an engine or airframe, performed with a flexible optical probe. Non-destructive method detecting cracks, erosion and corrosion without removal, per AMM procedures approved by ANAC.
MPI (Magnetic Particle Inspection): Magnetic particle inspection using a magnetic field and ferromagnetic particles to reveal surface or near-surface defects on ferromagnetic aviation parts. Reference technique for inspecting landing gears and engine shafts.
LPI (Liquid Penetrant Inspection): Liquid penetrant inspection using fluorescent or colored penetrant, revealing surface-breaking cracks on non-porous surfaces (aluminum, titanium, resin composites). Economical method widely used in shops for periodic inspections per OEM CMM.
ECT (Eddy Current Testing): Eddy current testing using electromagnetic induction to detect cracks, corrosion and conductivity variations on conductive parts. Essential for inspecting fastener holes and wing attachments.
UT (Ultrasonic Testing): Ultrasonic testing with a transducer emitting high-frequency waves, enabling detection of internal defects and thickness measurement. Preferred method for inspecting composite structures and critical welds.
Thermographie: Non-destructive testing using infrared imaging to detect thermal anomalies in a structure, indicating composite delaminations, water ingress or bonding defects. Fast method gaining traction on modern composite wings.
Tap test: Manual acoustic tapping test on a composite or honeycomb structure, using an inspection hammer or coin. Any sound variation reveals delamination or debonding requiring investigation by instrumented NDT methods.
TPM (Technical Publications Management): Centralized management of technical publications of an operator or PART-145 organization, ensuring all up-to-date versions of AMM, CMM, ADs and SBs are available to technicians. Audited by ANAC during approval renewals.

Recycling & end-of-life

16 terms

AFRA (Aircraft Fleet Recycling Association): International association defining Best Management Practices for end-of-life aircraft dismantling and recovery.
BMP (Best Management Practices): AFRA reference standards for responsible, ecological and traceable dismantling.
USM (Used Serviceable Material): Used aircraft part certified fit for return to service, accompanied by its Form 1.
Green Recycling: Ecological industrial dismantling of end-of-life aircraft. AéroNéo concept combining depollution, traceable parts removal, material valorization and energy recovery.
Ice blasting: High-velocity ice particle paint stripping — ecological alternative to chemical strippers.
Dépollution: Drainage and selective collection of fluids (fuel, oils, hydraulics, waste water) prior to dismantling.
End-of-life: Final phase of an aircraft's lifecycle, prior to dismantling and recovery.
Composites recycling: Recovery channel for carbon and glass fiber composite materials from the dismantling of recent aircraft. Combines grinding, pyrolysis and solvolysis to reintroduce fibers into secondary industrial cycles.
Titanium recovery: Recovery of titanium from aviation parts (engine pylons, landing gears, fasteners). High-value-added material sold as scraps sorted by grade (Ti-6Al-4V in particular) to specialized foundries.
Hazardous waste: Hazardous waste from dismantling (oils, hydraulics, batteries, paints, treated composites). Collection, labeling and treatment governed by Algerian regulation on special waste and the Basel Convention.
Pyrolyse composites: Thermochemical process decomposing carbon composites at high temperature in a controlled, oxygen-free atmosphere. Recovers reusable carbon fibers and provides energy valorization of the resin matrix.
Solvolyse: Chemical composite recycling process using selective dissolution of the resin matrix with supercritical solvents. Better preserves fiber length than pyrolysis and improves the quality of the recycled fiber.
Mechanical grinding: Mechanical grinding of end-of-life composites producing aggregates usable as fillers in secondary plastic compounds. The simplest and most economical solution, but significantly degrading the original mechanical properties of the fibers.
REACH (Registration, Evaluation, Authorisation of Chemicals): European regulation governing the use of chemical substances, applicable to dismantling operations when recycled materials are exported to the EU. Requires traceability and declaration of hazardous substances present in the streams.
Asset recovery rate: Recovery rate of parts and materials from an end-of-life aircraft, expressed as a percentage of the initial mass. Key indicator of AFRA-led projects, with a sector target above 90% combining USM, non-ferrous metals and composites.
Aluminium scrap segregation: Selective sorting of aviation aluminum grades (2000, 7000 series) from dismantling, for resale to foundries. Separation by alloy avoids cross-contamination and maximizes the market value of the recycled metal.

P2F conversion

14 terms

P2F (Passenger-to-Freighter): Industrial conversion of a passenger aircraft into all-cargo configuration. Involves cabin removal, floor reinforcement, cargo door and ULD systems.
MDCD (Main Deck Cargo Door): Main Deck Cargo Door installed during a P2F conversion.
ULD (Unit Load Device): Standardized container or pallet used for air freight.
STC (Supplemental Type Certificate): Modification certificate approving an aircraft transformation (e.g., a P2F conversion).
AKE: Standard lower-deck ULD container (LD-3), 4.3 m³ capacity, 1,588 kg max weight. Dominant reference for narrow-body and wide-body air cargo, integrated into automated loading systems of P2F-converted aircraft.
AAY: 96 x 125 inch main-deck ULD pallet used on freighter and P2F aircraft. Transports bulky loads secured by net, fully exploiting the main deck height.
Class E cargo compartment: FAA/EASA classification of a main-deck cargo compartment on a freighter. Requires a smoke detection system, controllable ventilation and fire-resistant lining. Mandatory standard for any certified P2F conversion.
Supernumerary seats: Seats reserved for personnel accompanying the cargo (loadmaster, couriers, technicians) on a freighter or P2F-converted aircraft. Limited in number by the conversion STC and subject to the same safety requirements as passenger seats.
9G barrier: Separation barrier between the cockpit and the main cargo hold of a P2F-converted aircraft. Must withstand 9G deceleration in case of sudden stop, protecting the crew from any cargo shift in the cabin.
PMC: Standard 96 x 125 inch ULD pallet, capacity up to 6,800 kg, used on main decks of freighter and P2F aircraft. Dominant reference for wide-body cargo with certified tie-down net.
LD3: Lower-deck ULD container, functional equivalent of the AKE, 4.3 m³ capacity. Universal standard for wide-bodies, optimized to fit side-by-side in the circular fuselage section.
Smoke detection: Mandatory smoke detection system installed in any Class E cargo compartment during a P2F conversion. Combines photoelectric and ionization sensors linked to the cockpit, per ANAC, EASA and FAA requirements.
FWD/AFT cargo: Designation of the forward and aft cargo holds of an aircraft. On a P2F, the main deck becomes the main cargo hold while the lower FWD/AFT holds retain their palletized loading function.
Floor reinforcement: Structural reinforcement of the cabin floor during a P2F conversion, by adding longerons, crossbeams and composite panels. Must support concentrated pallet loads (up to 5,000 kg) and ULD rolling stresses.

Storage & preservation

16 terms

Preservation: Set of procedures applied to a grounded aircraft to preserve its airframe, engines and systems.
Ground-run: Periodic on-ground startup of engines and systems during long-term storage.
Mojave: Californian desert airport, one of the world's largest aircraft storage centers thanks to its dry climate.
Tucson (Davis-Monthan): US Air Force 'Boneyard' in Arizona, world's largest military storage center in desert climate.
Victorville: Californian airport specialized in civil aircraft storage, in the Mojave desert.
Level 1 preservation: First short-term storage level (up to 30 days), allowing rapid return to service. Engine intake and exhaust plugs, pitot and static covers, periodic engine and system runs per OEM schedule.
Level 2 preservation: Intermediate storage level (30 days to 1 year), with engine preservation, anti-corrosion treatments of hydraulic and fuel circuits, and enhanced periodic inspections. Extended engine cycling to preserve seals and lubricants.
Level 3 preservation: Long-term storage (over 1 year) with full preservation: removal of certain sensitive components, nitrogen filling of engines, integral wrapping. Procedure prior to dismantling, resale or refurbishment.
Intake cover: Plug sealing the engine air intake during storage or parking, preventing entry of birds, insects, dust and moisture. Standard item in any engine preservation kit.
Pitot cover: Protective cover for the aircraft's Pitot and static probes on the ground. Essential to prevent obstruction by insects, dust or frost — a known cause of incidents when forgotten before flight.
Induction phase: Initial storage induction phase for an aircraft, including entry inspection, exterior wash, fluid drainage or treatment, installation of protections and establishment of the upkeep program. First step before any preservation level.
Reactivation phase: Reactivation phase of an aircraft returning from storage: deep inspections, removal of protections, refilling, engine runs, check flight. Typical duration of 2 to 8 weeks depending on initial preservation level and storage duration.
Engine plug: Plug sealing engine inlets, exhausts and drains during storage, preventing ingress of foreign objects and moisture. Standard item of a preservation kit complemented by desiccant bags.
Towbar: Towbar attached to the aircraft nose landing gear, allowing ground movement by a tractor. Critical item during long-term storage where the aircraft must be moved periodically to prevent tire flat spots.
Ground locks: Safety locks installed on the landing gear on the ground, preventing any inadvertent retraction during maintenance or storage. Mandatory red 'Remove Before Flight' streamers for visual reminder before return to service.
Hydraulic cycling: Periodic activation of an aircraft's hydraulic circuits during storage, lubricating actuators, maintaining seal integrity and preventing internal corrosion. Scheduled at OEM-defined intervals in the preservation program.

Training

12 terms

PART-147: EASA framework for aircraft maintenance training organizations.
Type rating: Type qualification issued to a technician or pilot after specific training on an aircraft model. In Algeria, the rating is recognized by ANAC based on a PART-147 curriculum or ICAO equivalent.
OJT (On-the-Job Training): Practical training in real situations, supervised by a certified mentor, complementing theoretical teaching. Mandatory step to obtain a type rating or a PART-66 category B license.
CBT (Computer-Based Training): Computer-based training combining interactive modules, videos and assessment tests. Industry standard for regulatory recurrent training (human factors, dangerous goods, security).
Recurrent training: Periodic recurrent training mandated by the authority (ANAC, EASA, FAA) for all certified personnel. Typical 24-month cycles covering regulations, human factors and technical updates.
Simulator training: Training on a flight or maintenance simulator, reproducing complex or hazardous scenarios without risk. Level D FFS simulators are qualified by the authority as equivalent to real flight for type rating.
Human Factors: Discipline studying human interactions with aviation technical systems. Mandatory training for all PART-145 personnel, focused on error prevention ('dirty dozen'), communication and fatigue management.
Module Part-66: Theoretical knowledge unit of the PART-66 licensing curriculum, structured in 17 modules (mathematics, physics, electricity, engines, structures, etc.). Independent written exam for each module, validated by the authority (ANAC in Algeria).
MCC (Multi-Crew Cooperation): Multi-crew cooperation training, required by ICAO and ANAC in Algeria to operate as a pilot on a multi-pilot certified aircraft. Covers communication, task allocation and crew error management.
JOC (Jet Orientation Course): Jet orientation course prior to a jet type rating, dispensed to familiarize the pilot coming from a propeller environment with the specifics of high-altitude, high-speed flight.
Basic license: Basic PART-66 license category A, B1 or B2 issued by the authority (ANAC in Algeria) after theoretical curriculum and verified practical experience. Mandatory prerequisite for any specific type rating on an aircraft model.
Refresher training: Periodic refresher training for certified personnel, dispensed on average every 24 months. Covers regulatory updates, lessons learned and technical novelties on the aircraft model concerned.

Regulation & standards

29 terms

PART-145: EASA and FAA framework governing aircraft maintenance organizations. Defines requirements on personnel, tooling, procedures and traceability.
PART-66: EASA framework for aircraft maintenance personnel licensing (categories A, B1, B2, C).
AD (Airworthiness Directive): Mandatory airworthiness directive issued by an aviation authority requiring a specific action.
SB (Service Bulletin): Service bulletin issued by the OEM recommending or mandating a modification or inspection.
EASA (European Union Aviation Safety Agency): European aviation safety reference authority.
FAA (Federal Aviation Administration): US aviation authority.
ANAC Algérie (Autorité Nationale de l'Aviation Civile): Algerian civil aviation authority, responsible for air safety and organization certification.
OACI (Organisation de l'Aviation Civile Internationale (ICAO)): UN agency setting global civil aviation standards.
IATA (International Air Transport Association): International Air Transport Association — commercial and operational standards.
ISO 14001: International environmental management standard.
ISO 9001: International quality management standard.
EN 9110: Aviation-specific quality standard for maintenance organizations (sector-specific derivative of ISO 9001).
Concession aéroportuaire: Algerian administrative contract by which the State entrusts a company with the operation of an airport infrastructure, with no transfer of ownership.
ICAO Annex 1: Annex 1 of the Chicago Convention, setting global standards for aviation personnel licensing (pilots, technicians, controllers). Transposed into Algerian regulation by ANAC.
ICAO Annex 6: Annex 6 of the Chicago Convention, setting aircraft operating rules (commercial transport, general aviation, helicopters). Reference framework imposed on Algerian operators by ANAC.
ICAO Annex 8: Annex 8 of the Chicago Convention, addressing airworthiness of aircraft: certification, continuing operational status, modifications. International basis for airworthiness certificates issued by ANAC in Algeria.
ICAO Annex 19: Annex 19 of the Chicago Convention, dedicated to safety management. Requires each State to maintain a national program (SSP) and each operator to maintain a management system (SMS) approved by ANAC.
SMS (Safety Management System): Safety management system required by ICAO (Annex 19) and ANAC in Algeria. Systemic approach combining safety policy, risk management, safety assurance and promotion. Mandatory for every operator and PART-145 organization.
CAMO (Continuing Airworthiness Management Organisation): Continuing airworthiness management organization, approved under Part-CAMO (EASA) or its ANAC equivalent in Algeria. Responsible for documentation tracking, AD/SB management and check scheduling on behalf of an operator.
DOA (Design Organisation Approval): Design organisation approval granted by the authority (ANAC, EASA Part-21J, FAA) authorizing a manufacturer to design modifications, major repairs or STCs on aircraft.
POA (Production Organisation Approval): Production organisation approval granted by the authority (ANAC, EASA Part-21G, FAA) authorizing series production of parts and equipment conforming to the certified type.
TC (Type Certificate): Type certificate issued by the primary certification authority (ANAC, EASA, FAA), attesting that an aircraft model meets the applicable airworthiness requirements. Basis for the entire maintenance documentation.
ICAO Annex 13: Annex 13 of the Chicago Convention dedicated to aircraft accident and incident investigations. Defines State responsibilities (State of occurrence, registration, operator) and applicable procedures, transposed by ANAC in Algeria.
ICAO Annex 17: Annex 17 of the Chicago Convention, dedicated to civil aviation security against acts of unlawful interference. Defines requirements applicable to airports, operators and organizations — implemented in Algeria via ANAC national programs.
RVSM (Reduced Vertical Separation Minima): Reduced vertical separation between aircraft to 1,000 feet between FL290 and FL410, allowing increased traffic density. Requires specific aircraft and operator approval, monitored by ANAC in Algeria.
PBN (Performance-Based Navigation): Air navigation concept based on the performance of onboard systems (accuracy, integrity, availability), enabling optimized trajectories without depending solely on ground aids. ICAO doctrine progressively deployed by ANAC in Algeria.
ADS-B (Automatic Dependent Surveillance-Broadcast): Automatic surveillance system broadcasting the GNSS position, speed and identification of an aircraft at regular intervals to ATC and other traffic. Progressive deployment mandate on the Algerian commercial fleet, regulated by ANAC.
TCAS (Traffic Collision Avoidance System): Onboard collision avoidance system monitoring surrounding traffic by interrogating transponders and issuing resolution advisories (RA) in case of conflict. Mandatory equipment above 5,700 kg or 19 seats, regulated by ANAC.
EGPWS (Enhanced Ground Proximity Warning System): Ground proximity warning system enhanced with a global terrain database and trajectory predictions. Mandatory on all commercial transport per ICAO Annex 6 and ANAC requirements in Algeria.

Operations & aircraft

22 terms

AOG (Aircraft on Ground): Status of an aircraft grounded for a technical issue. Triggers a priority emergency response.
Apron: Paved parking area of an airport, where aircraft are parked, loaded or serviced.
Taxiway: Taxi route linking runways to parking aprons.
Tarmac: Paved surface of an airport (runway, taxiway, parking).
Hangar: Covered building to shelter aircraft for storage or maintenance.
APU (Auxiliary Power Unit): Onboard auxiliary generator providing electrical and pneumatic power on ground and in flight.
Narrow-body: Single-aisle commercial aircraft — A320, B737, ATR, etc.
Wide-body: Twin-aisle commercial aircraft — A330, A350, B777, B787.
Lessor: Aircraft leasing company owning aircraft rented to airlines (e.g. Avolon, AerCap, SMBC).
Jet bridge: Mobile telescopic walkway connecting the terminal to the aircraft door for passenger boarding without exposure to weather. Airport equipment maintained under a preventive maintenance program distinct from that of aircraft.
Turnaround: Complete ground turnaround cycle of an aircraft between arrival and departure: deplaning, cleaning, refueling, boarding. Key operational performance metric, optimized especially on short-haul flights.
Dispatch reliability: Dispatch reliability indicator, expressed as the percentage of flights departed without a technical delay exceeding 15 minutes. Typical operational target: 99% and above.
Ferry flight: Ferry flight without commercial passengers or cargo, generally to reach a maintenance center, deliver a new aircraft or change base. Subject to a specific ferry permit issued by ANAC in Algeria.
Condition monitoring: Maintenance strategy based on continuous monitoring of operating parameters (vibrations, temperatures, oil consumption). Allows replacing calendar-based maintenance with intervention triggered by actual component condition.
Hard time: Maintenance policy mandating component replacement at a fixed calendar or cycle threshold, regardless of apparent condition. Historical strategy retained for critical parts without possible monitoring.
On-condition: Maintenance policy involving periodic inspection of a component and replacement only when its condition warrants. Intermediate between hard time and condition monitoring, requiring clear assessment criteria.
OTP (On-Time Performance): Operational indicator expressing the percentage of flights departed or arrived on time, with a typical 15-minute tolerance. KPI monitored monthly by every airline; sector target around 80-85% in normal operations.
Load factor: Aircraft load factor, ratio between passengers carried and seats offered (or cargo tonnes against available capacity). Central indicator of operational profitability, to be correlated with yield to measure actual commercial performance.
RPK (Revenue Passenger Kilometre): International unit of passenger traffic measurement, corresponding to one paying passenger carried over one kilometer. Aggregated reference indicator used by every airline to measure traffic volume, complementing ASK (available seat-kilometres).
CASK (Cost per Available Seat-Kilometre): Unit cost per available seat-kilometre, key indicator of an airline's cost structure. Enables cross-sector comparison independent of aircraft size or stage length, generally expressed in cents.
Block hour: Aircraft block hour, counted from the moment the aircraft leaves the parking block (gate) to its return at destination. Reference unit for maintenance billing, fleet productivity calculation and utilization programs.
Turnaround time: Aircraft ground turnaround duration between arrival and next departure. Key operational metric: 30-45 minutes for short-haul narrow-bodies, 90-120 minutes for long-haul wide-bodies. Optimized through coordination of refueling, cleaning and boarding operations.

Documents & traceability

18 terms

Form 1: EASA/FAA document (EASA Form 1, FAA 8130-3) certifying airworthiness of an aviation part. Issued by an authorized inspector.
AMM (Aircraft Maintenance Manual): OEM manual defining all maintenance procedures for an aircraft type.
CMM (Component Maintenance Manual): Maintenance manual for a component, issued by its manufacturer.
Back-to-birth: Full traceability of a part from manufacture to current use.
Release-to-Service: Act by which a PART-145 organization returns an aircraft to service after maintenance, confirming its airworthiness.
Capability list: List of aircraft and tasks a PART-145 organization is authorized to maintain.
IPC (Illustrated Parts Catalog): Illustrated parts catalog of an aircraft or equipment. Indispensable reference for identification, ordering and traceability of parts, structured by ATA chapter and exploded views.
8130-3: FAA form equivalent to EASA Form 1, certifying the conformity and airworthiness of a part. Issued by a qualified inspector of an approved Part-145 organization or by a manufacturer holding a US POA.
CRS (Certificate of Release to Service): Certificate signed by certified PART-66 category B or C personnel, attesting that maintenance work has been performed in accordance with applicable procedures and that the aircraft is airworthy.
Logbook: Aircraft or engine logbook, chronologically listing all technical events, flights, maintenance interventions and incidents. Mandatory document to be presented during any inspection by ANAC or a foreign authority.
ICA (Instructions for Continued Airworthiness): Instructions for continued airworthiness published by the manufacturer upon product certification. Include the AMM, CMM, SRM and initial maintenance program, binding on the entire PART-145 chain.
SRM (Structural Repair Manual): Structural repair manual issued by the manufacturer, describing approved airframe repair methods (sheet metal, composites, spars). Any repair outside the SRM requires specific DOA approval.
SDR (Service Difficulty Report): Service difficulty report submitted by an operator to the authority (ANAC in Algeria) following the detection of a significant in-service failure. Key information source for continued airworthiness and possible AD issuance.
MOR (Mandatory Occurrence Report): Mandatory occurrence report required from every operations and maintenance personnel, submitted within 72 hours to the authority (ANAC in Algeria). Feeds the national occurrence database and safety management system (SMS).
TCDS (Type Certificate Data Sheet): Type certificate data sheet, published by the authority (ANAC, EASA, FAA), summarizing the characteristics, limitations and approved equipment of an aircraft model. Reference document for any maintenance or modification operation.
FCOM (Flight Crew Operating Manual): Flight crew operating manual written by the manufacturer, describing normal, abnormal and emergency procedures for an aircraft type. Reference operational document for pilots, complementary to the onboard QRH (Quick Reference Handbook).
Dirty Fingerprint: Material traceability marking of a part having undergone an intervention, physical or electronic signature of the certified mechanic. Indispensable link of the back-to-birth chain for any USM resale accompanied by a Form 1.
TIR (Technical Information Report): Technical information report issued by the manufacturer or a PART-145 organization to inform the fleet of a particular observation made in service. Non-binding but useful for proactive failure prevention and operational feedback enrichment.

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