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O N A L 4

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GISTE
VOLUME 23

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N lT tO

NUMBER 136

Washington, Saturday, July 12, 1958
TITLE 14 CIVIL AVIATION
Chapter I Civil Aeronautics Board Subchapter B Economic Regulations
Standard Practice Letter No. 4
Part 241U niform S ystem of A ccounts and R eports for C ertificated A ir Carriers COMPUTATION OF AVAILABLE CAPACITY

The Uniform System of Accounts and Reports requires th at each air carrier file with the Civil Aeronautics Board a detailed statement of its present meth ods and any subsequent changes thereto in computing available ton-miles and available seat-miles for each aircraft type operated. The primary objective of the foregoing provision is to ensure com parability of the capacity data reported by the several carriers.
Statements initially filed by the car riers in accordance with the foregoing requirement have varied considerably as to scope and detail, resulting in difficulty of interpretation and causing burden to both the carriers and Board staff in pre paring and using the statements.
Therefore, under date of May 22, 1957, certain standard practices and a stand ard format, directed toward simplifying the presentation of the required state-;
ment, were circulated to the industry for comment. After careful review of the comments submitted and further con sideration of the needs of the Board in this matter, the proposed standard prac tices and format are hereby revised a to exclude free baggage in computing passenger compartment capacity and b to limit filing of the form to one sample for each aircraft type where Form 41
data are based upon actual capacity for each individual hop rather than upon standards reflecting average conditions for the aircraft type.
As provided in the system of accounts, the computation of available seat-miles should be based upon direct airport-toairport mileage between points served and the number of installed seats in cluding lounge seats less any seats not available because of safety restrictions or Priority mail loads. Similarly, the computation of available ton-miles should be based upon airport-to-airport mileage and the capacity available to traffic.

The over-all capacity of aircraft, for computing available seat-miles and available ton-miles, is controlled by the lower of 1 the capacity computed un der the weight basis or 2 the capacity computed under the space basis as il lustrated by the attached format. The average lift potential of the aircraft, giving effect to operating limitations, is reflected by the weight basis computa tion, whereas the space basis computa tion reflects limitations upon the average lift potential due to configuration, traffic density and available cubic space.

For these purposes the standards pre scribed in the manual or otherwise ap proved for passenger and free baggage weight should be used. Individual car rier standards may be used for the num ber of installed seats, aircraft lift potential, cargo density, etc., provided that the standards are based upon repre sentative e x p e rie n c e , th at separate standards are developed, as appropriate, for different classes of traffic and types of aircraft, and th at the manner of de termining each standard is fully ex plained in statements filed in con formance with 241.22 d 10 sectior 22.4 of the m anual.
The objective of the attached format is to express on a uniform basis the aver age characteristics of each aircraft type used by the several carriers. Standards may be adopted to reflect operations for an entire year, part of a year, trip di rection or other refinement. However, the data need be provided for only one representative sample of such refinement and the other seasonal or directional standards listed in such manner as to reveal the scope of variation in available seats and tons for the aircraft type.
Where standard capacities áre not used, the data should be provided for a repre sentative illustration of one inter-airport hop for each aircraft type and each air craft seating arrangement.
Therefore, pursuant to duly delegated authority as set forth in Public Notice 12, 23 F. R. 2946 effective May 1, 1958, the information indicated in the a t tached form at 1 shall be "presented as a m atter of standard practice, to comply with the requirements of 241.22 d 10 section 22.4 of the manual calling for statements on methods of computing 1 Filed as part of original document.
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CONTENTS
Agricultural Marketing Service
Pae
Proposed rule making :
Milk in New York-New Jersey marketing area:___________ 5308
Rules and regulations:
Lemons grown in California and Arizona; limitation of han dling___________________ _ 5298
Limes grown in Florida; quality and size regulation____ ____ 5298
Oranges, Valencia, grown in Ari zona and designated part of California; limitation of handling__________ 5293
Plums grown in California; reg ulation by grades and sifces 5 documents_________ 5294-5297
Agriculture Department
See Agricultural Marketing Serv ice.
Alien Property Office
Notices:
Kalio, Inc.; dissolution order_ 5309
Civil Aeronautics Administra tion
Rules and regulations:
Standard instrument approach procedures; alterations_____

5291

Civil Aeronautics Board
Rules and regulations:
Uniform system of accounts and reports for certified air car riers; computation of avail able capacity___ 1 _________

5289

Civil Service Commission
Rules and regulations:
Exclusion from provisions of Federal Employees Pay Act of 1945, as amended, and the Classification Act of 1949, as amended, and establishment of maximum stipends for positions in Government hospitals filled by student or resident trainees:
J Government of District of Co lumbia; certain positions._ 5293
Student medical technologists interns______________
5293
Commerce Department
See also Civil Aeronautics Admin istration; F e d e r a l Maritime Board; Foreign Commerce Bu reau; Maritime Administration.
5289