Most ordering problems with aircraft parts start with the part number: a missing dash number, a superseded number, or a vendor’s catalog number instead of the manufacturer’s. This guide shows how to find the right number before you order.

Start With the Illustrated Parts Catalog

The manufacturer’s Illustrated Parts Catalog (IPC) for your aircraft, engine or component is the source of truth. Use the revision that covers your model and serial number, find the figure for the assembly, and read the item, part number, description and effectivity columns. Effectivity tells you which serial numbers a part applies to; two aircraft of the same model can need different parts.

Read the Data Plate on Components

For components such as starters, magnetos, governors, pumps and instruments, the data plate on the unit shows the part number, modification or dash number, and serial number. Send all three; units with the same base number can differ by modification status.

Supersessions and Interchangeability

Manufacturers replace part numbers over time. A superseded number may be replaced by a new number that is two-way interchangeable (either can be used in place of the other) or only one-way interchangeable (the new part can replace the old one, but not the reverse). The manufacturer’s parts catalog and service information state which applies. When you send us an older number, we check the current part number and its alternates before we quote.

OEM, PMA, TSO and Standard Parts

OEM parts are made by or for the aircraft, engine or component manufacturer.
PMA parts are made under an FAA Parts Manufacturer Approval (14 CFR Part 21, Subpart K) and are marked “FAA-PMA.” They are FAA-approved replacement parts, often at a lower price than the OEM part. Some operators and foreign authorities set their own rules on PMA parts, so check yours.
TSO articles are appliances made to a Technical Standard Order, which sets minimum performance standards (for example many batteries, ELTs and instruments).
Standard parts are made to a published industry specification, such as AN, MS, NAS and AS hardware.

Common Part Number Mistakes

Dropping the dash number. The -1 and -2 versions of a bracket are often left and right hand, or different lengths.
Letter O versus zero, and letter I versus one. Copy numbers exactly from the catalog or data plate.
Using a vendor’s catalog number. Some suppliers use their own stock numbers; always order by the manufacturer’s part number.
Missing finish or color codes on interior and exterior parts.
Ordering a kit when you need one piece, or the reverse. Check whether the IPC lists the item as an assembly, a kit or a detail part.

What to Send With a Quote Request

The manufacturer’s part number, exactly as written in the IPC or on the data plate.
The aircraft or engine model and serial number.
The condition you need (new, overhauled, serviceable or exchange) and the release document you require, such as an FAA 8130-3. See FAA Form 8130-3 Explained.
The quantity and the destination country, so shipping and export documents are right the first time.

Aviation Parts Executive lists parts from manufacturers including Lycoming and Cessna, plus FAA-PMA alternatives where they exist. Search by part number in our aircraft parts catalog, or call, text or WhatsApp +1 (954) 493-5088. For pricing options, see Outright, Exchange or Overhaul.

How to Find the Right Aircraft Part Number: IPC, Supersessions, Alternates and PMA Parts