What AOG means, and the exact requirement to send
For an aircraft-on-ground (AOG) request, send the exact part number shown in the applicable maintenance or parts data, the required quantity, and the aircraft or engine application. Add the aircraft registration or manufacturer serial number when it helps identify a configuration. If the removed unit has a serial number, include it too. A photograph of the identification plate can clarify an ambiguous transcription, but it should supplement—not replace—the written part number.
State whether an alternate or superseding part number may be considered, and who will confirm its applicability. Two items with similar descriptions are not automatically interchangeable. The operator or its authorized maintenance organization must verify installation eligibility against current approved data and the specific aircraft configuration. FAA guidance treats part quality, eligibility and traceability as separate checks, so a fast search should not collapse them into a single yes-or-no question.
- Part number, description and quantity; serial number when applicable
- Aircraft model, registration or serial number, and relevant engine or system configuration
- Acceptable condition and required release or traceability documents
- Delivery destination, receiving contact and latest useful arrival time
Describe the timing in operational terms
“Urgent” is less useful than a time, place and decision window. Give the airport or shipping address, local time zone, aircraft status, and the latest time the material can arrive and still be used. If an aircraft departure has moved, update the request immediately. A buyer may need to approve a quote, confirm paperwork, arrange payment and establish a receiving contact before any shipment can move.
If the maintenance team can accept more than one condition, make that explicit. A serviceable exchange unit, for example, may involve core-return terms and additional records that are irrelevant to an outright purchase. If only a particular condition or certificate is acceptable, say so at the start rather than after a potential source is found.
Ask for evidence with the offer
Request the proposed part number, serial number if applicable, condition, location, available documentation and any stated limitations in the same offer. Keep the commercial quote separate from the technical release decision. A certificate can help establish an item’s approval or maintenance status, but it does not by itself authorize installation on a particular aircraft. EASA makes this distinction explicit for Form 1; the installer still determines suitability for the intended application.
For cross-border movements, confirm the receiving organization’s document requirements before committing to a route. The acceptable paperwork can depend on the aircraft register, the part’s status and applicable agreements. A complete first request reduces avoidable back-and-forth, but availability, transit and installation remain subject to verification rather than a promised AOG clock.
Keep one current version of the requirement. If the maintenance finding, acceptable condition or destination changes, send an explicit update to everyone quoting the part. This is especially important when several team members are contacting sources at once: a quote against yesterday’s requirement can look responsive while no longer solving the aircraft’s problem.
Source material
These references provide general context. Confirm item-specific requirements with the applicable records and qualified teams.