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REGISTER
VOLUME 19

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NUMBER 74

Washington, Friday, April 16, 1954
9

TITLE 14

c iv il a v ia t io n
Chapter I Civil Aeronautics Board Civil A ir Begs., Arndt. 3-11
P art
3 A ir p l a n e A i r w o r t h i n e s s ; N o r

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U t i l i t y , a n d A cr o b a t ic C a t e g o

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FLASH IN G RATES FOR P O S IT IO N LIG H T S

Adopted by the Civil Aeronautics Board at its office in Washington, D. C.
on the 12th day of April 1954.
Currently effective 3.700 e of Part 3 of the Civil Air Regulations requires that, if a position light flasher is used, the position light system shall be ener gized at a rate of not less than 60 nor more than 100 flashes per minute with an on-off ratio between 2:1 and 1:1. This requirement became effective on Jan uary 15, 1951. Some time later, it was found that one of the most popular lowcost flashers being used with position lights could not comply with these stand ards. This flasher, which was widely used, was thus rendered ineligible for installation on airplanes type certificated in accordance with provisions of Part 3
in effect after January 15, 1951. Since, in general, greater conspicuity is ob tained with flashing position lights than with steady lights, safety is served by en couraging the use of flashing position lights. Therefore, to determine whether the present requirements for flashing rates could be extended without impair ing safety to enable the use of this low-cost flasher, an investigation was undertaken. This investigation, which included practical tests, revealed that an extension of the upper lim it of the flash ing rate to 120 f. p. m. is justified, and that no noticeable deterioration in con spicuity occurs at this increased limit.
It was also revealed that with the higher flash rate limit, a somewhat higher limit on the on-off ratio would be desirable because it tends to increase the apparent intensity of the light. This amendment, therefore, increases the upper limit of the flashing rate from 100 to 120 f. p. m., and the upper limit of the on-pff ratio from 2:1 to 2.5:1.
Interested persons have been afforded an opportunity to participate in the mak
ing of this amendment, and due consid eration has been given to all relevant matter presented.
In consideration o f the foregoing, the Civil Aeronautics Board hereby amends Part 3 o f the Civil Air Regulations 14
CPR, Part 3, as amended effective May 17, 1954.
By amending 3.700 e by deleting the numerals 100 and 2:1 and insert ing in lieu thereof the numerals 120
and 2.5:1 respectively.
Sec. 205, 52 Stat. 984; 49 U. S. C. 425. Inter pret or apply secs. 601,603, 52 Stat. 1007,1009, as amended; 49 U. S. C. 551, 553

By the Civil Aeronautics Board.
seal
M. C. M u l l i g a n , Secretary.

P . R. Doc. 54r-2872; Piled, Apr. 15, 1954;
8:52 a. m .

Civil Air Regs., Arndt. 6-5
P art 6 R o to r cr aft A ir w o r t h in e s s F L A S H IN G RATES FOR P O S IT IO N LIG H T S

CONTENTS
Agriculture Department
Pa€

See Commodity Credit Corpora tion.

Alien Property Office Notices:
Vested property, intention to re turn:
Baumgart, William, et al-----Castelli, Xavier Francois_____
Lacau, Robert Joseph--------Lambert, Georges_____ _______
Parnet, Louis___ j__________
Société Civile dEtudes Tech niques_____________________
Zaruba, Anton J____________

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Army Deportment See Engineers Corps.

Civil Aeronautics Board Rules and regulations:
Flashing rates for position lights:
Airplane airworthiness; nor mal, utility, and acrobatic categories_________________
Rotorcraft airworthiness
2201
2201

Adopted by the Civil Aeronautics Commerce Department Board at its office in Washington, D. C See Foreign Commerce Bureau.
on the 12th day of April 1954.
Commodity Credit Corporation Currently effective 6.632 e of Part Rules and regulations :
6 of the Civil Air Regulations requires Grain sorghums; 1954-crop price that, if a position light flasher is used, support program; editorial the position light system shall be ener note _______________________ 2203
gized at a rate of not less than 60 nor more than 100 flashes per minute with Customs Bureau an on-off ratio between 2:1 and 1:1. Rules and regulations:
Customs warehouses and con This requirement became effective on trol of merchandise therein 2203
January 15, 1951. Some time later, it was found that one of the most popular Defense Department low-cost flashers being used with posi Rules and regulations:
tion lights could not comply with these Industrial security manual for standards.
This flasher, which was safeguarding classified infor widely used, was thus rendered ineligible mation---------------------------- 2205
for installation on rdtorcraft type cer Education Office tificated in accordance with provisions Rules and regulations:
of Part 6 in effect aftfer January 15,1951.
Federal assistance in construc Since, in general, greater conspicuity is tion of minimum school fa
obtained with flashing position lights cilities in areas affected by than with steady lights, safety is served Federal activities; determina by encouraging the use of flashing posi tion made for fiscal year 1955
tion lights. Therefore, to determine o f insufficiency of available whether the present requirements for funds; final date for filing applications_________________ 2212
Continued on p. 2203
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