Aviation is a high-stakes, high-margin industry. Where there is money to be made, counterfeiters and unapproved vendors will infiltrate the supply chain. When a bogus part reaches the hangar floor, you—the certifying mechanic—are the final line of defense.
If you bolt an unapproved part onto an aircraft and sign the Technical Logbook, you have not only violated the law, but you have legally assumed the liability for that aircraft’s airworthiness.
For AME students and working professionals, identifying a Suspected Unapproved Part (SUP) requires looking beyond the immediate snag and questioning the pedigree of the hardware in your hands. Here is your tarmac guide to spotting and stopping SUPs.
Prerequisite Knowledge: The Regulatory Baseline
Before inspecting hardware, you must understand the legal definition of an “approved part.”
- Target Audience: AME students, A&P mechanics, B1/B2 licensed engineers, and Stores Inspectors.
- Core Concepts: An approved part is manufactured under approved design data (e.g., FAA PMA, TSO) and maintained by an approved organization (14 CFR Part 145 or EASA Part-145). Anything else is a SUP.
- Official Authority Links:
The Tarmac Reality: What Exactly is a SUP?
A SUP isn’t always a malicious counterfeit. Sometimes, it is a legitimate OEM part that has lost its legal traceability or bypassed required maintenance protocols.
| SUP Category | Description | Tarmac Example |
| Counterfeit | Parts deliberately manufactured to imitate OEM parts without approval. | A completely fake B737 flap track roller made from inferior steel. |
| Stolen/Salvaged | Genuine parts illegally removed from scrap aircraft and sold as “overhauled.” | An A320 landing gear actuator pulled from a crashed hull and scrubbed clean. |
| Production Overrun | Parts made by an approved OEM supplier, but sold “out the back door” without NAA approval. | Fasteners that failed Quality Control but were sold directly to a broker. |
| Expired Life-Limit | Life-limited parts (LLPs) that have exceeded their cycles but had their data plates altered. | A CFM56 high-pressure turbine (HPT) disk with forged cycle records. |
| Improperly Maintained | Parts repaired by a facility lacking the specific rating or approved data for that component. | An avionics unit repaired by a shop without the specific OEM test bench. |
The Ramp Inspection: Spotting the Fakes
Mechanics are naturally focused on the installation procedure (the AMM/SRM), but you must also perform an incoming inspection of the part itself.
1. Red Flags on the Paperwork
Before the part leaves its box, audit the EASA Form 1 or FAA Form 8130-3.
- Typographical Errors: Look for misspelled OEM names (e.g., “Airbuss” or “Boieng”).
- Altered Documents: Look for mismatched fonts, white-out, or photocopies where the inspector’s stamp is blurry or completely illegible.
- Missing Dual-Release: As covered in the tagging guide, an FAA 8130-3 without an EASA dual-release statement is considered a SUP when attempting to install it on an EASA-registered aircraft.
2. Red Flags on the Hardware
The physical differences between legacy mechanical systems and modern digital architectures dictate what you are looking for.
- Legacy Mechanical (e.g., Boeing 737NG): When inspecting flight control cables, pulleys, or landing gear linkages, look for rough machining marks, inconsistent anodizing (wrong color/finish), or safety wire holes on bolt heads that are drilled off-center.
- Modern Digital (e.g., Airbus A320neo): When inspecting an Electronic Engine Control (EEC) or an FMGC, the physical box might look fine, but the data plate is the target. Look for data plates that are glued on crookedly, stamped with non-standard fonts, or exhibit signs of previous removal (scratches around the rivets).
WARNING: FLIGHT SAFETY COMPROMISE. Counterfeit hardware (like main rotor bolts or engine mount pins) often has less than 50% of the tensile strength of the OEM equivalent. They will pass a visual inspection and a torque check on the ground, but will shear under dynamic aerodynamic loads in flight.
Tarmac Scenario: The CFM56 Starter Change
The Snag: You are on the line replacing a pneumatic starter on a CFM56-7B engine (Boeing 737-800). Stores delivers a “freshly overhauled” starter sourced from a third-party broker to meet an AOG (Aircraft on Ground) deadline.
Diagnostic & Regulatory Logic:
- Paperwork Check: The FAA 8130-3 looks legible, but the repair station listed does not match the logo printed on the starter’s shipping box.
- Visual Inspection: You pull the starter out. You notice the data plate has fresh rivets, but the casing around the rivets is heavily scarred. You check the V-band clamp mating surface; it shows heavy pitting and wear that was simply painted over, contradicting the “Overhauled” status in Block 11 of the 8130-3.
- Action: You do not install the part. You immediately stop the job, refusing the pressure from operations to dispatch the aircraft.
CAUTION: DO NOT RETURN A SUP TO STORES. If you hand a suspected bogus part back to the parts clerk, it may accidentally be re-issued to another mechanic on the next shift. It must be physically segregated.
The Regulatory Protocol: What to Do Next
When you find a SUP, you must follow a strict legal sequence:
- Quarantine: Attach a red “Unserviceable/Rejected” tag to the part. Document exactly why it is rejected.
- Segregate: Place the part in a physically locked and secure quarantine area within the stores facility.
- Report: Notify your Quality Assurance (QA) manager immediately.
- Escalate: The QA department is legally obligated to investigate and file a formal report—such as an FAA Form 8120-11 or an EASA Occurrence Report (Part-376)—with the regulatory authorities to alert the global aviation network.
Case Study: The AOG Technics Scandal (2023)
If you think SUPs are a problem of the past, look at the massive global grounding triggered in 2023 by a UK-based supplier called AOG Technics.
This broker supplied thousands of engine parts—including turbine blades and compressor stators—for the CFM56 engine, the most widely used engine in the world (powering the Airbus A320ceo and Boeing 737NG families).
The Breakdown:
- Forged Paperwork: AOG Technics sold used parts with completely fabricated EASA Form 1 and FAA 8130-3 certificates. They forged the signatures and approval numbers of legitimate MROs who had never actually touched the parts.
- The Discovery: Line mechanics and MRO inspectors noticed slight discrepancies in the formatting of the release certificates and contacted the MROs listed on the paperwork, who confirmed the forms were fake.
- The Consequence: The FAA and EASA issued emergency Airworthiness Directives. Airlines worldwide had to pull A320s and B737s off the line, grounding fleets to tear down engines and physically hunt for the bogus parts.
The defense against events like the AOG Technics scandal doesn’t start in a regulatory office; it starts on the ramp. Trust your manuals, scrutinize the paperwork, and if a part looks wrong, quarantine it. Your signature is the only thing standing between a bogus part and the sky.
