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FEDERAL
VOLUME 12

N
UMBER 208

Washington, Thursday, October 23,19 47

TITLE 14 CIVIL AVIATION
Chapter I Civil Aeronautics Board Begs. Serial No. 399
P art 41C ertification and O peration R ules for S cheduled A ir C arrier O p
erations O utside C ontinental L im its of the U nited S tates P art
61S cheduled
A ir C arrier R ules
REQUIREMENT OF AN ABSOLUTE TERRAIN
PROXIMITY INDICATOR ON ALL SCHEDULED
AIRCRAFT CARRYING PASSENGERS DURING
HOURS OF DARKNESS OR UNDER INSTRUMENT
FLIGHT RULE CONDITIONS

Adopted by the Civil Aeronautics Board at its office.in Washington, D. C., on the 10th day of October 1947.
The purpose of this Special Civil Air Regulation is to require an absolute ter rain proximity indicator, of a type ap proved by the Administrator, on all air craft operated in the scheduled air car rier service carrying passengers during the hours of darkness or under instru ment flight rule conditions.
Air carrier accidents in which the air craft have just failed to clear the terrain have pointed to the need for such a device to warn the-pilot of an unsafe altitude or of an impending collision with the ter rain. The presently developed absolute terrain proximity indicators appear to fulfill this need. However, the reliability of absolute terrain proximity indicators has not been completely proved in air carrier operations, and the device, there fore, is to be used only as an auxiliary aid and will not replace or supersede other presently required navigational instru ments. The two-year period during which this regulation will be in effect will provide an opportunity to evaluate the utility of such a device as basic equip ment for all air carrier aircraft.
The Civil Aeronautics Board finds that this Special Civil Air Regulation is neces sary in the interest of safety, and that the provisions of paragraphs a and b of section 4 of the Administrative Pro cedure Act have been complied with.
Effective February 15, 1948, pursuant to the provisions of Title VI of the Civil Aeronautics Act of 1938, as amended, the following Special Civil Air Regulation is adopted.
Aircraft operated in scheduled air car rier service carrying passengers during the hours of darkness or under instru ment flight rule conditions shall be
equipped with an absolute terrain prox imity indicator, of a type approved by the Administrator, which will warn the pilot of the altitude of the aircraft above the terrain at altitudes of 2,000 feet, 1,000 feet, and any predetermined alti tude between 300 and 500 feet inclusive.
This Special Civil Air Regulation shall terminate February 15, 1950.
52 Stat. 984, 1007; 49 U. S. C. 425, 551
By the Civil Aeronautics Board.
seal
M. C. M ulligan , - Secretary.
F. K. Doc. 47-9476; Filed, Oct. 22, 1947;
8:46 a. m.J

Chapter II-Administrator of Civil Aeronautics, Department of Com merce Arndt. 3
P art 601D esignation of C ontrol A reas, C ontrol Zones , and R eporting P oints MISCELLANEOUS AMENDMENTS

It appearing th a t:l Part 601 of the Regulations of the Administrator should be amended to conform with Part 60 of the Civil Air Regulations, revised effec tive October 8,1947 <12 F. R. 5547-5552 ; <2 This amendment will clarify Part 601 without imposing additional restric tions upon Interested parties;
3 This amendment has been coordi nated "ith the civil operators involved, the Army, and the Navy through the Air Coordinating Committee, Air-Space Sub committee; and 4 Compliance with the general notice of proposed rule making and pub lic procedure requirements in section 4
a of the Administrative Procedure Act would serve no purpose other than to delay issuance of this amendment which, in the public interest, should be made effective immediately.
Now, therefore, acting pursuant to the authority vested in me by sections 205, 301, 302, and 308 of the Civil Aeronautics Act of 1938, as amended, and Special Regulation No. 197 of the Civil Aeronau tics Board, I hereby amend Part 601 of the Regulations of the Administrator of Civil Aeronautics as follows:
1.
Part 601 is changed by substituting a new heading as set forth above.
Continued on next page
CONTENTS
Agriculture Department
Pae
See also Entomology and Plant Quarantine Bureau.
Proposed rule making:
Olive oil; U. S. standards_____ 6913
Alien Property, Office of
Notices:
Vesting orders, etc.:
Bauer, Marie____ _________ 6915
Dobbertin, Emma_________ 6916
Meyer, Elizabeth Gertrude, et al___________________
6915
Soehne, W. Grose__________ 6916
Vohs, Arthur_____________
6916
Wehr, Joseph_____________, 6916
Civil Aeronautics Administra tion
Rules and regulations:
Designation of control areas, control zones, and reporting points; miscellaneous amend ments__ - ________________

6905

Civil Aeronautics Board
Notices:
Hearings, etc.:
Northeast Airlines, Inc., et al.;
Boston-Bermuda service__
Resort Airlines, Inc.; Skycruise case___ ;_________
State Airlines, Inc., and Pied mont Aviation, Inc.; South eastern States case_______
Rules and regulations:
Absolute terrain proximity in dicator: requirement on all scheduled aircraft carrying Rassengers during hours of darkness or under instrument flight rule conditions______

6917
6917
6917

6905

Entomology and Plant Quaran tine Bureau
Proposed rule making:
Foreign quarantine; nursery stock, other plants, and bulbs_

6912

Federal Housing Administration
Rules and regulations:
Title I Insurance; reports by lending institution________ 6907
Federal Power Commission
Notices:
Hearings, etc.:
Montana Power Co________ 6918
Oconto Electric Cooperative_6918
Southern California Edison Co____________________ 6918
York County Gas Co________ 6917
6905