Forget TSA "requirements". It's a FEDERAL LAW to not use TSA locks. The TSA website is incorrect.
49 CFR § 1540.111 - Carriage of weapons, explosives, and incendiaries by individuals
§ 1540.111 Carriage of weapons, explosives, and incendiaries by individuals.
(a) On an individual's person or accessible property—prohibitions. Except as provided in
paragraph (b) of this section, an
individual may not have a weapon,
explosive, or incendiary, on or about the
individual's
person or accessible property—
(1) When performance has begun of the inspection of the
individual's
person or accessible property before entering a
sterile area, or before boarding an aircraft for which screening is conducted under this subchapter;
(2) When the
individual is entering or in a
sterile area; or
(3) When the
individual is attempting to board or onboard an aircraft for which screening is conducted under §§
1544.201,
1546.201, or
1562.23 of this chapter.
(b) On an individual's person or accessible property—permitted carriage of a weapon.
Paragraph (a) of this section does not apply as to carriage of firearms and other weapons if the
individual is one of the following:
(1) Law enforcement personnel required to carry a firearm or other weapons while in the performance of law enforcement duty at the airport.
(2) An
individual authorized to carry a weapon in accordance with
§§ 1544.219, 1544.221, 1544.223, 1546.211, or subpart B of
part 1562 of this chapter.
(3) An
individual authorized to carry a weapon in a
sterile area under a security program.
(c) In checked baggage. A
passenger may not transport or offer for transport in
checked baggage or in baggage carried in an inaccessible
cargo hold under
§ 1562.23 of this chapter:
(1) Any loaded firearm(s).
(2) Any unloaded firearm(s) unless—
(i) The
passenger declares to the
aircraft operator, either orally or in writing, before checking the baggage, that the
passenger has a firearm in his or her
bag and that it is unloaded;
(ii) The firearm is unloaded;
(iii) The firearm is carried in a hard-sided container; and
(iv) The container in which it is carried is locked, and only the passenger retains the key or combination.
(3) Any unauthorized
explosive or incendiary.
(d) Ammunition. This section does not prohibit the carriage of
ammunition in
checked baggage or in the same container as a firearm. Title
49 CFR part 175 provides additional requirements governing carriage of
ammunition on aircraft.
[
67 FR 8353, Feb. 22, 2002, as amended at
67 FR 41639, June 19, 2002;
70 FR 41600, July 19, 2005;
71 FR 30507, May 26, 2006]
Disclaimer: No law degree but I did stay at a Holiday Inn last night.