This is not an identifying data plate, does not provide information about the manufacturer nor any explicit information on the manufacturer’s part number or FAA type certification. It is just a sticker placed on the part by an overhaul shop, without description of its content except for (via ‘S/No’) a restatement of the manufacturer’s serial number.
Hartzell, the propeller manufacturer and TC holder specifies that their part number and serial number data is properly determined by reference to stamped numbers elsewhere on the propeller, not by reference to an overhaul shop’s sticker. MT acting as an FAA repair station has no authority to supersede required manufacturer’s identifying data. That is probably why the MT sticker does not identify what its numbers signify – to ensure that it is not mistaken for an Identification Plate.
If you have a vivid imagination and know MT does overhauls, you might be able to guess that it was overhauled (OHC) by MT in November 2022. Otherwise I think it’s just inconsequential commercial practice, in comparison to either stamped manufacturer’s identifying data or the official overhaul logbook entries entered by MT as an FAA repair station. I do not believe removing such a sticker has any airworthiness impact at all.
boscomantico wrote:
Question: is this a legally required placard by FAA rules following an overhaul?
Answer IMHO: No, it is one of these infamous marketing and advertisement thingies.
I m possibly being daft, but is said sticker in exactly the same place on each blade? If only one blade or in different places, is the balance not affected at 2500rpm, even though stickers don’t weigh much??
skydriller wrote:
I m possibly being daft, but is said sticker in exactly the same place on each blade? If only one blade or in different places, is the balance not affected at 2500rpm, even though stickers don’t weigh much??
MT usually puts one Ad-sticker on the propeller and – beware they balanced the prop with it so you can’t remove it ;-).
I would say no. Here is what the FAA regulations say:
45.11 Marking of products.
(c) Propellers and propeller blades and hubs. Each person who produces a propeller, propeller blade, or propeller hub under a type certificate or production certificate must mark each product or part. Except for a fixed-pitch wooden propeller, the marking must be accomplished using an approved fireproof method. The marking must –
(1) Be placed on a non-critical surface;
(2) Contain the information specified in § 45.13;
(3) Not likely be defaced or removed during normal service; and
(4) Not likely be lost or destroyed in an accident.
Appendix B to Part 43 – Recording of Major Repairs and Major Alterations specifies what should be recorded for overhauls:
(a) Except as provided in paragraphs (b), (c), and (d) of this appendix, each person performing a major repair or major alteration shall –
(1) Execute FAA Form 337 at least in duplicate;
(2) Give a signed copy of that form to the aircraft owner; and
(3) Forward a copy of that form to the FAA Aircraft Registration Branch in Oklahoma City, Oklahoma, within 48 hours after the aircraft, airframe, aircraft engine, propeller, or appliance is approved for return to service.
(b) For major repairs made in accordance with a manual or specifications acceptable to the Administrator, a certificated repair station may, in place of the requirements of paragraph (a) –
(1) Use the customer’s work order upon which the repair is recorded;
(2) Give the aircraft owner a signed copy of the work order and retain a duplicate copy for at least two years from the date of approval for return to service of the aircraft, airframe, aircraft engine, propeller, or appliance;
(3) Give the aircraft owner a maintenance release signed by an authorized representative of the repair station and incorporating the following information:
(i) Identity of the aircraft, airframe, aircraft engine, propeller or appliance.
(ii) If an aircraft, the make, model, serial number, nationality and registration marks, and location of the repaired area.
(iii) If an airframe, aircraft engine, propeller, or appliance, give the manufacturer’s name, name of the part, model, and serial numbers (if any)
Had them stickers on my 3 bladed custom painted yellow MT prop (homebuilt), peeled them off as soon as I could 
