Aerospace Intelligence

Airworthiness Directive: mandatory corrective action under the applicable jurisdiction; verify the issuing authority, product, effectivity, and effective date.

Proposed Airworthiness Directive: a proposal, not an issued mandatory AD.

Safety Information Bulletin: safety information, generally non-mandatory; verify the original publication.

Transport Canada Civil Aviation Safety Alert: recommended safety action or awareness; not automatically an AD.

Service Difficulty Report: reported defect or malfunction; a report is not proof of a fleetwide defect.

Maintenance, Repair and Overhaul.

Aircraft on Ground: operational urgency for parts or repairs; not a statement of airworthiness by itself.

Request for Quotation: an enquiry, not a purchase order or a confirmed sale.

Part number: must be checked against approved applicable data; text similarity is not interchangeability.

NATO Stock Number: logistics identifier; does not independently establish aircraft installation eligibility.

Overhauled condition; verify applicable release paperwork and approved data.

Serviceable: supplier condition claim requiring verification of release and traceability.

New material; verify manufacturer, specification, traceability and release documents.

Parts Manufacturer Approval: FAA-approved design and production authority for eligible parts, subject to applicability.

FAA Authorized Release Certificate; verify block entries, provenance and intended purpose.

EASA/Transport Canada authorized release document; issuing authority and context matter.

Service Bulletin: manufacturer instruction; mandatory status depends on the relevant regulatory framework or AD.

Certificate of Conformity: document scope and issuer must be verified; not a universal maintenance release.

ATA chapter: aircraft system category used to organize technical information.

Life-Limited Part: time/cycle limits and traceability may apply.

Illustrated Parts Catalogue: helps identify parts and applicability but is not independent authorization for a substitution.

Component Maintenance Manual: component maintenance instructions, revisions and effectivity matter.

Aircraft Maintenance Manual: maintenance instructions for the relevant aircraft configuration.

Supplemental Type Certificate: approved change to a type design with specific effectivity.

Emergency Airworthiness Directive: urgent regulatory AD; consult issuing authority and actual effective date.

Special Airworthiness Information Bulletin: FAA advisory information; not automatically an AD.

Suspected Unapproved Part: investigation/traceability flag, not automatic proof every similar item is unapproved.

A manufacturer replaces a P/N with another; verify authorized data, applicability and effectivity.

A purported alternate cannot be accepted for installation without approved data and applicability checks.

Used Serviceable Material: condition and release traceability require verification.

Repairable/exchangeable asset generally managed through serial/condition/life records.

Item generally consumed or discarded rather than repaired through a rotable exchange pool.

Owner places inventory with a seller; confirm title, seller authority and quote terms.

Time from order acceptance until shipment or delivery; supplier claim can change.

Aircraft powerplant system category; not a particular bolt P/N or approval.