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VOLUME 17

I SCRIPTA I

1934

NlTtO

NUMBER 52

Washington, Friday, March 14, 1952
TITLE 14 CIVIL AVIATION
Chapter I Civil Aeronautics Board Subchapter A Civil Air Regulations
Supp. 19
P art
4bA irpla ne
A ir w o r t h in e s s ;
T ransport C ategories BRAKE SYSTEM

,
The following policies are hereby adopted:
4b.337-2 Brake systems .CAA poli cies which apply to 4b.337. In order to obtain a minimum landing distance under 4b.l22 and at the same time meet the deceleration requirement of 4b.337
a 2 in event of failure of the normal brake system, it is a common practice to provide an alternate brake system.
When hydraulic or pneumatic brakes are used in the normal brake system, this alternate means usually consists of a duplicate hydraulic or pneumatic brake system and is commonly referred to as the emergency brake system. The fol lowing items should be considered in the design of such systems:
a Relationship between normal and emergency brake systems. The systems for actuating the normal brake and the emergency brake should be so separated that a failure in or the leakage of fluid from one system, will not render the other system inoperative. A hydraulic brake assembly may be common to both the normal and emergency brake systems if it is shown that the leakage of hydrau lic fluid resulting from failure of the sealing elements in the brake assembly would not reduce the braking effective ness below that specified in 4b.337 a 2 .

b Brake control valves. In the nor mal brake systems of all aircraft, the brake control valves should be of a type such that the pilots may exercise varia ble control of the pressure to the brakes.
The foregoing provision need not neces sarily apply to the emergency brake systems although obviously such a provi sion would be desirable. Flight tests should be conducted to determine that the normal and emergency brake systems fulfill the requirements of 4b.170 a and b.
In the normal brake systems of tail wheel type aircraft or of nose wheel type aircraft equipped with non-steerable nose wheels, provisions should be
made for independently controlling the brakes on either side of the main land ing gear in order that directional con trol of the aircraft can be maintained.
See 4b.l71 c. In the emergency brake systems of tail wheel type aircraft and in the nofmal and emergency brake systems of nose wheel type aircraft, it is desirable that independent control of the brakes on either side of the landing gear be provided although such control is op tional.
Sec. 205, 52 S ta t. 984, as am ended; 49
U. S. C. 425. In te rp re ts or applies sec. 603, 52
S ta t. 1009, 49 U. S. C. 553

These policies shall become effective upon publication in the F ederal R e g is
ter .

seal

F. B. L e e , Acting Administrator of Civil Aeronautics.

F. R. Doc. ,52-2985; H ied, Mar. 13, 1952;
8:48 a. m.

TITLE 15 COMMERCE AND
FOREIGN TRADE
Chapter III Bureau of Foreign and Domestic Commerce, Department of Commerce Subchapter C Office of International Trade
5th Gen. Rev. of Export Regs., A m dt 97

373L ic en sin g
CONTENTS
Agriculture Department
Civil Aeronautics Administra tion
Rules -and regulations :
Airplane airworthiness, trans port categories;, brake sys tems____________________ 2223
Civil Aeronautics Board
See also Civil Aeronautics Admin istration.
Notices :
Pan American World Airways, Inc. ; hearing_____________ 2234
Commerce Department
See Civil Aeronautics Administra tion; International Trade, Of fice of ; National Production Authority.
Customs Bureau
Notices:
Pacific Micronesian Line, Inc.;
registration of house flag and funnel mark_____________ _ 2234
Economic Stabilization Agency
See Price Stabilization, Office of.
Federal Power Commission
Notices:
lated S pecial Hearings, etc.:
Colorado Interstate Gas Co_
m iscella n eo us amendm ents Gulf States Utilities Co_____
1.
Section 373.24 Statement of past Texas Eastern Transmission participation in exports for certain com Corp. and Mississippi River modities, paragraph b Commodities re Fuel Corp____________
quiring statement of past participation United Fuel Gas Co. and Man is amended in the following particulars:
ufacturers Light and Heat The last entry listed in subparagraph Co_____________ _____
4 All controlled materials and certain Foreign and Domestic Com additional commodities with processing merce Bureau code NONF: is corrected to read as fol See International Trade, Office of.
lows :

P art
Pas
See also Production and Market ing Administration.
Notices :
Foot-and-mouth disease; find ing of emergency outbreak__ 2234

P o l ic ie s and R e
P ro visio ns
Any com m odity listed in 398.5 f con trolled m a te ria ls.
1 T his am endm ent was published in C ur re n t Export B ulletin No. 661, dated M arch 6, 1952. T he am endm ents to 373.24, 373.27, 373.28 an d to footnotes in 373.51 were p u b
lished in th e re p rin t pages of th e Com pre hensive E xport Schedule, d a te d M arch 6, 1952.
C ontinued on next page
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General Accounting Office
Notices:
Joint regulation for small pur chases u tiliz in g im p re s t funds___________________ 2235
General Services Administration
Notices:
Joint regulation for small pur chases u tiliz in g im p re s t funds___________________ 2236
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