740
14 CFR Ch. I (1–1–19 Edition)
Pt. 33, App. B
tests or equivalent service engine test expe-
rience on engines of similar design and eval-
uations of service usage of the 30-second OEI
or 2-minute OEI ratings.
[Amdt. 33–9, 45 FR 60181, Sept. 11, 1980, as
amended by Amdt. 33–13, 54 FR 34330, Aug. 18,
1989; Amdt. 33–21, 72 FR 1878, Jan. 16, 2007;
Amdt. 33–25, 73 FR 48124, Aug. 18, 2008]
A
PPENDIX
B
TO
P
ART
33—C
ERTIFICATION
S
TANDARD
A
TMOSPHERIC
C
ON
-
CENTRATIONS OF
R
AIN AND
H
AIL
Figure B1, Table B1, Table B2, Table B3,
and Table B4 specify the atmospheric con-
centrations and size distributions of rain and
hail for establishing certification, in accord-
ance with the requirements of § 33.78(a)(2). In
conducting tests, normally by spraying liq-
uid water to simulate rain conditions and by
delivering hail fabricated from ice to simu-
late hail conditions, the use of water drop-
lets and hail having shapes, sizes and dis-
tributions of sizes other than those defined
in this appendix B, or the use of a single size
or shape for each water droplet or hail, can
be accepted, provided that applicant shows
that the substitution does not reduce the se-
verity of the test.
T
ABLE
B1—C
ERTIFICATION
S
TANDARD
A
TMOSPHERIC
R
AIN
C
ONCENTRATIONS
Altitude (feet)
Rain water content (RWC)
(grams water/meter
3
air)
0 .................................................
20.0
20,000 ........................................
20.0
26,300 ........................................
15.2
32,700 ........................................
10.8
39,300 ........................................
7.7
46,000 ........................................
5.2
RWC values at other altitudes may be determined by linear
interpolation.
N
OTE
: Source of data—Results of the Aerospace Industries
Association (AIA) Propulsion Committee Study, Project PC
338–1, June 1990.
T
ABLE
B2—C
ERTIFICATION
S
TANDARD
A
TMOSPHERIC
H
AIL
C
ONCENTRATIONS
Altitude (feet)
Hail water content (HWC)
(grams water/meter
3
air)
0 .................................................
6.0
7,300 ..........................................
8.9
8,500 ..........................................
9.4
10,000 ........................................
9.9
12,000 ........................................
10.0
15,000 ........................................
10.0
16,000 ........................................
8.9
17,700 ........................................
7.8
19,300 ........................................
6.6
21,500 ........................................
5.6
24,300 ........................................
4.4
29,000 ........................................
3.3
46,000 ........................................
0.2
HWC values at other altitudes may be determined by linear
interpolation. The hail threat below 7,300 feet and above
29,000 feet is based on linearly extrapolated data.
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