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ECISTE
VOLUME 20

c
NUMBER 239

Washington, Friday, December 9, 1955

TITLE 14 CIVIL AVIATION
, Chapter I-Civil Aeronautics Board Subchapter ACivil Air Regulations ISupps. 19, 22, 31
P art 40 Scheduled I nterstate A ir C arrier C ertification and O perations T :
": .

R ules /
P art 41 Certification and O peration R u l es for S cheduled A ir C arrier O pe r a tio n s O utside the C ontinental L im it s of the U nited S tates P art 42 I rregular A ir C arrier and O ff -

R oute R ules operational u s e o f w e a t h e r r e p o r t s fo r in s t r u m e n t
approach ,
l a n d in g ,
or
takeoff
The air carrier operating rules of the Civil Air Regulations provide in part that no instrument approach, landing, or takeoff shall be made when the latest weather report furnished by the U. S.
Weather Bureau or a source approved by the Weather Bureau indicates a ceiling or visibility below authorized minimums.
Current CAA rules 40.406-1,41.119-2, and 42.56-2 apply this requirement to a runviray weather observation contained in the official wfeather report for a par ticular runway.
At airports where runway weather ot serrations are made, when reporting run way visibility to a pilot conducting a:
instrument approach, the tower con troller obtains the runway visibility froi a direct reading visibility meter in th tower.
This meter is electronical!
geared to an instrument in the Weathe Bureau for graphically recording th runway visibility value measured by th transmissometer instrument. A repeate visibility meter for indicating run way visibility in fractional increment is also located in the Weather Burea office. Since minimums for instrumer approach according to the regulatio:
are predicated on .the latest weather re Port, the tower controller cannot repoi immediately to a pilot any substantu visibility change observed on the towe Iritu meter without coordinate wuh the Weather Bureau, which mui issue a special observation report fc ach such change in visibility value ob vJnf-vV Particularly under variabl Diiity Conditions, this prevents maxi the instrumentatio sea for measuring runway visibility. 1

also places an additional burden on the controller, which is undesirable under instrument weather conditions because his full attention should be directed to the control of air traffic. Also due to the various duties of the Weather Bureau observer, he may be preoccupied in per forming some other function. For this reason the control tower operator is in a fa r better position to continually ob serve any change in visibility value in dicated on the visibility meter and , should be able to.report such change in visibility to the pilot conducting an in strument approach as the official runway visibility without recording the observa tion or advising the Weather Bureau. In case any question should later arise as to the official runway visibility at any par ticular time, this information can be obtained from the Weather Bureau where it is continually recorded on graph recording. However, such visi bility data may not be contained in the sequence weather report because of the time interval between the hourly and special observations made and recorded by the weather observer.
. In view of the foregoing, the Adminis-V
trator hereby adopts the following re visions to 40.406-1, 41.119-2, and 42.56-2 of this subchapter. The pro posed rules were published on October 1, -1955, in 20 F. R. 7338-9. Interested per sons were afforded an opportunity to submit written views, data or arguments.
Consideration has been given to all rel evant comments presented.
1. Section 40.406-1 is revised to read as follows:
40.406-1 Takeoff and l a n d i n g weather minimums C A A rules which apply to 40.406 b a General.
The ceiling and visibility contained in the main body of the latest weather re port furnished by the U. S. Weather B u reau or a source approved by the Weather Bureau shall be used for instru ment approach and landing or takeoff for all runways of an airport except as provided in paragraph b of this section.
b Runway visibility. W h e n e v e r the latest weather report furnished by the U. S. Weather Bureau or a source approved by the Weather Bureau, in cluding an aural report from the control tower, contains a visibility value specified:
as a runway visibility for a particular Continued on next page
CONTENTS
Agricultural Marketing Service Proposed rule making:
Butter, cheese and other manuf a c t u r e d dairy products;
grading, inspection, sampling, grade labeling and supervi sion of packaging____________
Tomatoes grown in Florida;
safeguards and exemption procedures____________________
Rules and regulations:
Oranges, navel, grown in Ari zona and designated part of California; limitation of han dling__________________________

Page
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9151

Agriculture Department See Agricultural Marketing Serv ice.

Census Bureau Notices:
Inventories, sales, and accounts receivables of retailers; con sideration for surveys_______

9163

Civil Aeronautics Board Notices:
Hearings, etc.;
American Airlines, Inc_____ _
Flying Tiger Line, Inc______
Modern Air Transport, Inc., et al___________ ____________
Rules and regulations:
Operational use of weather re ports for instrument ap proach, landing, or takeoff:
Certification and operational rules for scheduled air car rier operations outside con tinental limits of United States_______________________
Irregular air carrier and offroute rules_________________
Scheduled interstate air car rier certification and oper ations rules________________

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9039
9039
9039

Commerce Department See also Census Bureau; Federal Maritime Board; National Bu reau of Standards.
Notices-:
Reports of appointments and statements of financial in terests:
Bower, Harry F ____ :__________
Burley, John V ______________
Daniels, Ernest W ___________
Gibbs, Lewis T _______ .________
Hughes, Glenn R ____________
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