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Federal Register / Vol. 86, No. 199 / Tuesday, October 19, 2021 / Proposed Rules pressures exceeding the design pressure of the part of the system being tested.
Pneumatic tests may be made with the refrigerant in the system or if the refrigerant has been removed, oilpumped dry nitrogen or bone-dry carbon dioxide with a detectable amount of the refrigerant added, should be used as a testing medium. Carbon dioxide should not be used to leak test an ammonia system. In no case should air, oxygen, any flammable gas or any flammable mixture of gases be used for testing.
272. Amend 58.255 as follows:
a. In paragraph a:
i. Revise the definition for Auxiliary steering gear;
ii. Add a definition for Control system;
iii. In the definition for Power actuating system, redesignate paragraphs 1 through 3 as paragraphs i through iii; and iv. In the definition for Steering-gear power, revise the definition heading and introductory text and redesignate paragraphs 1 through 3 as paragraphs i through iii; and b. In paragraph d:
i. Remove the word Steel and add, in its place, the word Marine; and ii. Remove the text 46 CFR and add, in its place, the symbol .
The revisions and addition read as follows:

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58.255

General.

a
Auxiliary steering gear means the equipment, other than any part of the main steering gear, necessary to steer the vessel in case of failure of the main steering gear, not including a tiller, quadrant, or other component serving the same purpose.
Control system means the equipment by which orders for rudder movement are transmitted from the pilothouse to the steering-gear power units. A control system for steering gear includes, but is not limited to, one or more i Transmitters;
ii Receivers;
iii Feedback devices;
iv Hydraulic servo-control pumps, with associated motors and motor controllers;
v Differential units, hunting gear, and similar devices;
vi All gearing, piping, shafting, cables, circuitry, and ancillary devices for controlling the output of power units; and vii Means of bringing steering-gear power units into operation.

Steering-gear power unit means:

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273. Amend 58.2510 as follows:
a. Redesignate paragraphs a through f as paragraphs b through g;
b. Add new paragraph a;
c. Revise newly redesignated paragraph b;
d. In newly redesignated paragraph c3 remove the text b2 and add, in its place, the text c2;
e. In newly redesignated paragraph d3, remove the text c2 and add, in its place, the text d2;
f. In newly redesignated paragraphs f1 and 2, remove the text b2
and add, in its place, the text c2;
g. In newly redesignated paragraph f4, remove the text e3 and add, in its place, the text f3;
h. Designate the note as note 1 to paragraph f4; and i. In newly redesignated paragraph g, remove the text e and add, in its place, the text f.
The addition and revision read as follows:

58.2510
gear.

Main and auxiliary steering
58.2520

Amended
274. Amend 58.2520 as follows:
a. In paragraph a, remove the text of this part;
b. In paragraph b, remove the text in accordance with 56.0710b of this subchapter; and c. In paragraph c2, remove the text that complies with 56.5090 of this subchapter.

58.2525

Amended
275. Amend 58.2525 as follows:
a. Remove paragraph a;
b. Redesignate paragraphs b through d as paragraphs a through c;
c. Remove paragraph e and the Note following paragraph e; and d. Redesignate paragraph f as paragraph d.

58.2540

Amended
276. Remove the note immediately following paragraph a3.

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277. Revise 58.2560 to read as follows:

58.2560 Non-duplicated hydraulic rudder actuators.

Non-duplicated hydraulic rudder actuators may be installed in the steering gear control systems on vessels of less than 100,000 deadweight tons.
These actuators must meet IMO
A.467XII incorporated by reference, see 58.031 and be acceptable to the Commanding Officer, Marine Safety Center.
58.2565

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Amended
278. In 58.2565, amend the introductory text to paragraph a, by inserting the word main between the word vessels and the word service.

58.2570

Amended
279. Amend 58.2570h1 by removing the text ; and and add, in its place, the text ..
280. Revise 58.2575 to read as follows:

58.2575

a Vessels accepted by a recognized classification society as meeting class Rules for steering gear, and SOLAS
Chapter II1, Regulations 29 and 30
incorporated by reference; see 58.03
1 are considered to meet the requirements of this Subpart.
b Power-operated main and auxiliary steering gear must be separate and independent systems. Other arrangements of steering gear will be acceptable if the Commanding Officer, Marine Safety Center, determines that they are equivalent to the requirements of, this subpart.

57975

Materials.

Materials used for the mechanical or hydraulic transmission of power to the rudder stock must have an elongation of at least 15% in 5 centimeters 2 inches.
58.2585

Amended
281. Amend 58.2585 as follows:
a. In paragraph c1, remove the text not more than 45 seconds;
b. In paragraph c2ii, remove the second and third sentences;
c. In paragraph d2, remove the text not more than 45 seconds; and d. Remove paragraph g and the note immediately following paragraph g.
282. Amend 58.301 as follows:
a. Revise the introductory text to paragraph a and paragraph a4;
b. In paragraph a5, remove the words main or; and c. In paragraph a10, remove the second sentence.
The revisions read as follows:

58.301

Scope.

a This subpart contains requirements for fluid power transmission and control systems and appurtenances. Except as otherwise provided for in this section, these requirements are applicable to fluid power and control systems where installed for the following equipment:

4 Automatic propulsion boiler control systems.

58.305

Amended
283. Amend 58.305 as follows:
a. In paragraph a, remove the words and should also consider the rate of

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