Air Flow Method Test.

(ii) Air Flow Method Test. When a locomotive is equipped with a 26L brake valve or equivalent pressure maintaining locomotive brake valve, a railroad may use the Air Flow Method Test as an alternate to the brake pipe leakage test. The Air Flow Method (AFM) Test shall be performed as follows:

Source

49 CFR § 232.205


Scoping language

Each train and each car in the train shall receive a Class I brake test as described in paragraph (c) of this section by a qualified person, as defined in 232.5, at the following points:
(1) The location where the train is originally assembled (“initial terminal”);
(2) A location where the train consist is changed other than by:
(i) Adding a single car or a solid block of cars, except as provided in paragraph (b)(2) of this section;
(ii) Removing a single car or a solid block of cars;
(iii) Removing cars determined to be defective under this chapter; or
(iv) A combination of the changes listed in paragraphs (a)(2)(i) through (a)(2)(iii) of this section (See §§ 232.209 and 232.211 for requirements related to the pick-up of cars and solid blocks of cars en route.);
(3) A location where the train is off-air for a period of more than 24 hours.
(4) A location where a unit or cycle train has traveled 3,000 miles since its last Class I brake test; and
(5) A location where the train is received in interchange if the train consist is changed other than by:
(i) Removing a car or a solid block of cars from the train;
(ii) Adding a previously tested car or a previously tested solid block of cars to the train;
(iii) Changing motive power;
(iv) Removing or changing the caboose; or
(v) Any combination of the changes listed in paragraphs (a)(5) of this section.
(A) If changes other than those contained in paragraph (a)(5)(i)–(a)(5)(v) of this section are made to the train consist when it is received in interchange and the train will move 20 miles or less, then the railroad may conduct a brake test pursuant to § 232.209 on those cars added to the train.
(B) [Reserved]

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