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VOLUME 16

34

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United

NUMBER 226

Washington, Wednesday, November 21, 1951

TITLE 14 CIVIL A V IA T IO N
Chapter ICivil Aeronautics Board fCivil Air Regs. Amdt. 4b-4

Part 4bAirplane Airworthiness;
T ransport Categories EMERGENCY EVACUATION PROVISIONS

Adopted by the Civil Aeronautics Board at its office in Washington, D. C., on the 15th day of November 1951.
The present regulations for doors and eniergency exits on transport category airplanes as contained in 4b.356 and 4b.362 of the Civil Air Regulations were promulgated for airplanes of a relatively smaller size than either-;many of those presently in operation or a majority of those which it is contemplated will be constructed in the -future. The rapid increase in size of transport airplanes, the larger number of passengers carried in each, and the increased seriousness of crash fires due to greater fuel capacity, all indicate the need for a revision of these requirements.
It has been established by evacuation demonstrations that two large openings, one on each side of the ait portion of the fuselage, provide a means for more rapid and safe evacuation of passengers than any other type of .exit presently in use. Accordingly, this amendment tends to require more and larger floor-level exits located well aft in the fuselage.
Additional exits have also been specified to allow rapid evacuation of all passen-
gers from either side of the airplane in the event that fire blocks the use of one . side.
The question of crew exits is still under study, and more specific proposals are expected to be published in this regard when present studies have been .com pleted. The Board, is cognizant of the fact that there may be small airplanes certificated in accordance with Part 4b which are of such small size that.it would be impracticable if not impossible to pro vide separate flight crew exits. In such cases separate exits will not be required provided that the Administrator finds them to be unnecessary in the particular model airplane.
Section 4b.356 b has also been amended in certain respects. The newly inserted first sentence corresponds with new 4b.362 e 4 , and is merely de claratory of the present practice of manufacturers. The remainder of the
paragraph contains no new provisions;
CONTEN TS
however, the requirement of a single Agriculture Department Eage handle to operate the door has been deleted. It has been brought to the at See Production and Marketing Administration.
tention of the Board that interpreta tions of the present rule do not allow Alien Property, Office of any separate safetying devices and that Notices:
an incipient hazardous condition may be Vesting orders, etc.:
created in certain situations. Although Ajioka, Tokio-------------------- 11793
this change is needed to permit operators Becker, Gottfried, et al-------- 11793
in their discretion to -provide additional I. G. Farbenindustrie Aktien safety devices against inadvertent open gesellschaft-------------------- 11793
ing of doors in flight, it is of a minor na Laenderbank Wien Aktien ture and imposes no additional burden gesellschaft------------------ 11792
on any person.
Mueller, Mrs. Alfred, and Dr.
With the exception of the amendment Hans von Flotow------------ 11792
of 4bJ356 b, interested persons have Rocard.-Yves Andre-------------- 11793
been afforded an opportunity to partici Tachibana, Itaru______ a 11794
pate in the making of this amendment, Vancoppenolle, Jean Leon_ ,11793
and due consideration has been given to all relevant matter presented. With re Army Department See also Engineers -Corps.
spect to the amendment of 4b.356 b the Board finds for reasons previously Rules and regulations:
Claims against the U. S.; pay stated that notice and public procedure ment for arrest and delivery- 11768
are unnecessary.
In consideration of the foregoing the Civil Aeronautics Administra Civil Aeronautics Board hereby amends tion Part 4b of the Civil Air Regulations 14 Rules and regulations:
CFR Part 4b, as amended effective De Standard instrument approach cember 20,1951.
procedures; instrument land 1. By amending 4b.356 b to read ing___ ____________________ 11762
as follows:
Civil Aeronautics Board 4b.356 Doors.
Proposed rule making:
b Means shall be provided for lock Elimination of requirements for ing each external door and for safe mandatory certification in guarding against opening in flight either the transport category-------- 11787
inadvertently by persons or as a result Rules and regulations:
of mechanical failure. It shall be pos Airplane airworthiness, trans sible to open external doors from either port categories; emergency the inside or the outside even though evacuation provisions----------- 11759
persons may be crowding against the Commerce Department door from the inside. The means of opening shall be simple and obvious and See Civil Aeronautics Administra tion; International Trade, Office shall he so arranged and marked that of; National Production Au it can be readily located and operated thority.
even in darkness.
Defense Department 2. By adding a new 4b356 e to See Army Department; Engineers read as follows:
Corps.
4b.356 Doors.
Defense Mobilization, Office of e Means shall be provided for a di Notices:
rect visual inspection of the locking Finding and determination of mechanism by crew members to ascer critical defense housing areas tain whether all external doors, includ under Defense Housing and ing passenger, crew, service, and cargo Community Facilities and doors, are fully locked see also 4b.362
Services Act of 1951------------ 11788
e 5 for emergency exits. In addi Economic Stabilization Agency tion, visual means Shall be provided to signal to appropriate crew members that See Price Stabilization, Office of;
Wage Stabilization Board.
Continued on p. 11761
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