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Part II begins on page 4177

Pakt I

FEDERAL
VOLUME 23

Un
NUMBER 115
it e d
Washington, Thursday, June 2 , 1958
CONTENTS

TITLE 14 CIVIL AVIATION
Chapter I Civil Aeronautics Board .Civil Air Regs., Arndt. 60-10
Part 60Air T raffic R ules
This issue includes two parts bound together. Part II contains a revision of Subchapter B of Chapter III, Title 15.

CRUISING ALTITUDES

Adopted by the bivil Aeronautics Board at its office in Washington, D. C., on the 6th day of June 1958.
Part 60 of the Civil Air Regulations currently specifies certain cruising alti-> tudes appropriate to the direction of flight. These rules differ depending on whether the flight is in controlled or uncontrolled airspace. Outside con trolled airspace above 3,000 feet and with less than 3 miles visibility, pilots are re quired to comply with a quadrantal rule.
Aircraft being operated in controlled airspace are required to be flown at odd or even thousand-foot altitudes as speci fied by the Administrator. These rules specify a rather complex system of de termining altitudes by direction of flight on colored airways and VOR airways, which is modified by a priority system for colored airways, and further modi fied where colored and VOR airways cofficide or cross. For irregular portions f airspace designated as controlled weas there is no altitude specification.
a Proposal to provide a single simplified in ifdetermineappropriate ciuisI tudes was circulated for comment, Jfiong others not here discussed, in r7 J r - r Regulations Draft Release No.
7 dated December 10, 1957.
aPPa rent from com m ent re ed.Pursuant to th is d ra f t release th a t DrpeoJf widespread agreem ent th a t th e cruising altitu d e rules have inpiw .s? omPlex as to become increas-

thpni1 ,c ve d early adoption of ifienewrules was urged.
cirpiiifamn

when a even thousands plus 500 feet bew 9q of 180 to 359 inclusive an ipn feetAircraft operating on tude Pan with a specific altiductM
would be normally cont odd thousands on magnetic
courses of 0 to 179 and even thousands on courses of 180 to 359. More simply, aircraft operating under VFR rules would cruise at plus 500-foot altitudes and IFR
traffic would normally cruise at cardinal altitudes. This arrangement establishes a degree of separation between the iFR
cruising altitude rules and the VFR
cruising altitude rules, which is advisable in light of the growing utilization of the one-way airway procedures.
The advantage ofthe new semi-circular rules would be to establish a single sys tem to apply in all airspace i. e., in and outside of controlled airspace. This will resolve the difficulties of determining proper cruising altitudes along airways, crossing airways, and in the large con trolled areas th at had previously been without any designated altitudes. Fur ther, it simplifies the rules to be followed when operating outside of airways and other controlled areas.
In order to provide for aircraft oper ating under the instrument flight rules and cleared by air traffic control to main tain VFR conditions on top, such flights will be required to comply with the altitude rules prescribed for VFR
flight.
In commenting on Draft Release 57-27, recommendations were received from the military and the Air Transport Associa tion, and later endorsed by other users, to modify the cruising altitude rules above 29,000 feet so as to provide a degree of separation between IFR and VFR
flights in a manner similar to the system proposed below 29,000 feet. It was con tended th at this modification would es tablish a uniform system to determine appropriate cruising altitudes at high, as well as low altitudes, thereby providing separation of cruising VFR and IFR traf fic at all altitudes. This modification would provide aircraft operating VFR
above 29,000 feet on reciprocal courses with a minimum vertical separation of a t Continued on p. 4135

Agricultural Marketing Service
page
Proposed rule making :
Milk, Red River Valley and cen tral west Texas marketing areas; handling--------:--------- 4169
Agricultural Research Service
Rules and regulations:
Quarantine notices, domestic;
khapra beetle; revised admin istrative instructions desig nating premises as regulated areas ____________________ 4142
Agriculture Department
See also Agricultural Marketing Service; Agricultural Research Service; Commodity Stabiliza tion Service.
Rules and regulations:
Setoffs; correction---------------- 4142
Alien Property Office
Notices :
Vested property, intention to return:
Schlegel, Eugen___________ 4175
Yorizane, T ak e sh i_________ 4175
Atomic Energy Commission
Notices:
General Electric Co. facility ex port license 2 documents_ 4170, 4171
Civil Aeronautics Administra tion
Rules and regulations:
Civil airways, designation of;
alterations________________ 4135
Continental control area, con trol areas, control zones, and reporting points; alterations- 4139
High density air traffic zones and airports, designation of_ 4141
Civil Aeronautics Board
Notices:
Aerovias sud Americana certifi cate renewal case; hearing 4175
Rifles and regulations :
Air traffic rules; cruising alti tudes______ ______________ 4133
Coast Guard
Rules and regulations : Control over movement of vessels; advance notice of ves sels time of arrival to captain of the port, U. S. Coast Guard- 4167
4133