Data Plate Information?

[Ritebros2003]

On the Cessna data plates that were issue during the 1950's...ie Cessna L-19 Birddog, there is an category just after the T.C. (Type certificate number), called P.C....what does the P.C. stand for?...Thank you

[4583C]

My guess would be Paint Code.

[GAHorn]

Production Certificate.
FARs 45.11 and 54.13 applies:

Section 45.11: General.
(a) Aircraft and aircraft engines. Aircraft covered under §21.182 of this chapter must be identified, and each person who manufacturers an aircraft engine under a type or production certificate shall identify that engine, by means of a fireproof plate that has the information specified in §45.13 of this part marked on it by etching, stamping, engraving, or other approved method of fireproof marking. The identification plate for aircraft must be secured in such a manner that it will not likely be defaced or removed during normal service, or lost or destroyed in an accident. Except as provided in paragraphs (c), (d), and (e) of this section, the aircraft identification plate must be secured to the aircraft fuselage exterior so that it is legible to a person on the ground, and must be either adjacent to and aft of the rear-most entrance door or on the fuselage surface near the tail surfaces.


Section 45.13: Identification data.
(a) The identification required by §45.11 (a) and (b) shall include the following information:

(1) Builder's name.

(2) Model designation.

(3) Builder's serial number.

(4) Type certificate number, if any.

(5) Production certificate number, if any.

(6) For aircraft engines, the established rating.

(7) On or after January 1, 1984, for aircraft engines specified in part 34 of this chapter, the date of manufacture as defined in §34.1 of that part, and a designation, approved by the Administrator of the FAA, that indicates compliance with the applicable exhaust emission provisions of part 34 and 40 CFR part 87.

(Nice try, Paul, but I doubt if all the 170's have the same paint code.)