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VOLUME 22

NUMBER 145
A flT E O

Washington, Saturday, July 27, 1957

TITLE 14 CIV IL A V IA TIO N
Chapter I Civil Aeronautics Board Reg. SR-422

Part 4b A ir pl a n e A ir w o r t h in e s s ;
T ransport C ategories Part 10 C ertification and A pproval of Import A ircraft and R elated P roducts Part 40 S cheduled I nterstate A ir C ar rier Ce rtification and O peration Rules Part 41 C ertification and . O peration Rules for S cheduled A ir C arrier .O p
erations O utside th e C o n t in e n t a l Limits of the U nite d S tates Part 42I rregular A ir C arrier R o ut e R u l e s special civil
air
r e g u l a t io n ;

and
O ff-

t u r b in e -

TRANSPORT CATEGORY AIRPLANES
OF CURRENT DESIGN

powered
Adopted by the Civil Aeronautics Boar< at its office in W ashington, D. C., n the 23d day of July 1957.
Part 4b of the Civil A ir Regulations jwitains rules governing the design o f ansport category airplanes.
Fbr a umber of years, this p art has established "worthiness requirements fo r this eate r y . 0 airplanes by prescribing detailed &S!!810118 to ke met fo r the issuance of type certificate. However, the advent tm.kUrbinePowered airplanes jets, bo-props, etc. has brought about o p considerably higher speeds attitudes than those involving r e hirt,Catns engine airplanes.
These cpriCr spees and altitudes as well as riarn inherent characteristics o f tu rbine have numerous H e w engines U
.

introduced U W V IL U V / t U A
A U A U C iU U O
hav. eChmcal ant design problems and necessitated re-evaluation and 4jj narnent of m any provisions in P a rt t a .

,rcent years the B o ard has ous w h Par 4k by introducing nu m eraDDiir0M Ca provisins more specifically Thpcn le turbine-powered airplanes.
Uertai .Were included in amendments terisHlng structural flight c h a ra c othpr P y erPlant installation, and 4b a Provisios. It is believed that P a rt now written is applicable to tu r-

bine-powered airplanes with but one ex ception; namely, airplane performance.
I n the future, fu rth er amendments to this part, other than those relating to perform ance, w ill be comparatively m inor in nature m ainly reflecting the latest experience in the certification and operation o f these airplanes.
T h e perform ance requirements pres ently in P a rt 4b were first prom ulgated alm ost twelve years ago. They are now considered by the B o ard to be in a form not suitable fo r direct application to turbine-powered airplanes.
T h e Adm inistrator of Civil A eronau tics is in receipt o f a large num ber of applications fo r type certification of turbine-pow ered airplanes.
However, the so-called non-retroactive clause of 4 b .ll a of P a rt 4b does not make applicable to a particular airplane type any amendment which is adopted after an application is filed by the m anu facturer fo r type certification of that airplane. Thus, most o f these airplanes are not now required to meet some of the latest effective provisions of P a rt 4b un
less the B o ard prescribes otherwise.
W ith so m any applications fo r type cer tificates pending, it is essential that the B o ard establish adequate requirements which w ill effectively apply to the type certification o f turbine-powered trans port category airplanes.
This Special Civil A ir Regulation is being prom ul gated fo r that purpose.
T h is Special Civil A ir Regulation is being m ade effective with respect to all turbine-powered transport category a ir planes not yet certificated. In essence, it prescribes a revised set of perform ance requirements fo r turbine-powered a ir planes and incorporates such o f the recent amendments to P a rt 4b as the Adm inistrator finds necessary to insure that the level o f safety of turbinepowered airplanes is equivalent to that generally intended by P a rt 4b.
T h e perform ance requirements con tained herein include not only the per form ance requirements necessary fo r the certification of an airplane, but also the complementary perform ance operating limitations as applicable un der Parts 40, Continued on p. 5947

CONTENTS
Agricultural Conservation Pro gram Service Rules and regulations:
L a n d dam aged by n atu ral dis asters; emergency conserva tion measures to restore to productive use_________ _______

Page
5953

Agricultural Marketing Service Proposed rule m aking:
Christm as trees; U . S. - stand ards ____________________________
Raisins, processed; U . S. stand ards fo r grades______________ _
R aisins produced from raisin variety grapes grow n in C ali fo rn ia _______ ___ ___ ___________
Rules and regulations:
Lemons grow n in C alifornia and Arizona; limitation o f h a n
d lin g . ___________________________
Oranges, V alencia; grow n in Arizona and designated p art o f California ; lim itation of h a n d lin g _______________________

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Agricultural Research Service Proposed rule m aking:
A n ti-h o g-ch o lera serum and hog-cholera virus_____________

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Agriculture Department See A gricultu ral Conservation Pro gram Service; A gricultu ral M arketing Service; A gricultural Research Service ; Commodity Stabilization Servic.

Alien Property Office Notices:
Vested property; intention to return :
B achm ann, Ernest___ ________
B aru th, Selm a_________________
Cementia H olding, A . G ____ _
Foehr, Elizabeth_____________
Gasparovic, P i jo _____________ _
N inistiftung in G la ru s _____ _
Reppm ann, W ilh elm B e n ja
m in ________ i ________________
W einberger, M aria, et a l______

Army Department See Engineers Corps.
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