O'HARE NOISE SURVEY
UNITED STATES ENVIRONMENTAL PROTECTION ACENCY - REGION V
DATA REPORT
A two day noise study was undertaken by the U. S, Environmental Pro-
tection Agency, Region V Office in response to a request by Congressman
Abner Mikva for current aircraft noise level data around O'Hara Airport.
A summer noise intern from the Office of Noise Abatement PIVJ Control
supervised the survey.
Under Title IV, Section 402C of the 1970 Clean Air Act, the United States
Environmental Protection. Agency is authorized to work directly with any
Federal agency toward the abatement of existing noise problems. As a
result, U. S. EPA has been working with Great Lakes Federal Aviation
Administration (FAA) and will 'supply them this data.
DESCRIPTION OF THE SURVEY
On August 24 and 28, 1972, quantitative noise measurements were made by
EPA at 15 locations around O'Hare (See attached maps). At many of the
locations, residents were interviewed to obtain their subjective com-
ments or, the noise problem.
Equipment employed for the measurements included 3 sound level meters
(General Radio Model 1565-B) and a graphic level recorder (General Radio
Moclel 1521-B). The sound level meters were used to obtain the peak sound
pressure levels radiating from the aircraft. The "A" - weighing circuit
a-ad the fast meter response were both activated. "A" - weighing is a
method of modifying the instrument frequency response so that it reacts
nearly like the human ear. See Figure 1.
LA
S
BO 100 200
5OO 1OOO 2OOO 50OO 10.000 ?0.000
FREQUENCY (Hz)
Fig.l, A,B,C, and D sound weighing curves.
-------
The fast meter response permits the sound level meter to respond to the
short duration jet noise level fluctuations. The graphic level recorder
was used only at the first 3 locations (there is a substantial setup time
for the equipment). The recorder produced curves showing the variation
of sound level with time. It is important to compare this graphical data
with the peak readings from the sound level meter. Peak sound readings
representing very short time intervals do not in themselves fairly represent
a noise problem.
Test locations were selected for the following reasons: Location No. 5 was
chosen to show the highest noise Levels expected at any residential area
around O'Hare Field. Location Nos. 1,2,7,8,9,10,11, and 12 were chosen to
Sound Levels and H.-man Response
-
Crrier Deck
Jet Operation
Jet Takeoff
(200 feet)
Discotheque
Auto Horn (3 feet)
Riveting Machine
Jet Takeoff
(2,000 feet)
Garbage Truck
N Y. Subway
Station
Heavy Truck
iSSSr Hearing
"''''' , Response Effects
i?
--
i r.<\ ::> Loud i-
r : f i .pi.fied <~
c:
Ci-
* .-..rriurrt Vccal ^
0
fL
ir
LJ
X
! O
Very Annoying
Z
: Hearing Damage O
(50 feet) ; (8 hours) t-
Pneumatic Drill ! , JjJ
(50 feet)
Alarm Clock
. Freight Train
(50 feet)
Freeway Traffic
(50 feet)
Air Conditioning
Unit (20 feet)
Light Auto Traffic
(100 feet)
Living Room
Bedroom
Library
Soft Whisper
(15 feet)
Broadcasting
Studio
i
1
Annoying P^
i g
o
O
Telephone Use y
Difficult
Intrusive
Quiet
Very Quiet
i
Just Audible
j
Threshold of
Hearing
Conversational
Relationships
-
!
* *
' Noise
Shouting in ear Level
^ 100
Curves Show How the Level of Noise
Shouting at 2 ft. Varies Wilh Distance
/
Very loud ' 90
Conversation, 2 ft.
Loud
Conversation, 2 ft.
80
Loud
Conversation, 4 ft.
Normal ' 70
Conversation, 12 ft.
60
~ 50
<
m
£>
0
tf
k °%.
>\ %
^ ^r
\ i0
\
s- %
' v
' r \^
' ^\
''^:- , " " ' --,
"l *'" '
j.
^^^ '«
i !' 1
ii W
Distance Between Talker & Listener ft
Fig. 2
Fig. 3
-------
obtain noise data beneath landing patterns for future analysis of noise
abatement landing procedures. Location Nos. 3,4,6,13, and 14 were chosen
beneath takeoff patterns for a possible comparison between takeoff and
landing noise. Location Nos. 2 and 7 are near large schools. Location
Nos. 14 and 15 are both near large, vacant land areas.
The new, quieter DC-lOs, L-lOlls, and 747s represented 1.370 of the 218
aircraft measured.
RELATION OF DATA TO HUMAN RESPONSE
The two charts shown in Figures 2 and 3 are useful in relating sound pressure
levels to human response. Both charts were taken from a U. S. EPA Public
Relations Circular, "Noise, Unwanted By-product of Modern Life."
EXPLANATION OF THE DATA PRESENTATION
Parameters and data for each location are presented on pages 7 through 27.
The Overflight A.ngle is a method used to describe the directional location
of the aircraft during it's flight past the test location. To determine
this parameter, the observer first faced the runway under study. See
Figure 4. Then, as an aircraft passed, the angle "&" to the "Left" or
"Right" is recorded. If the flight path is at 90°, then the description
"Overhead" is used. See Figure 5.
\
ra-
O
Fig. 4
Fig. 5
-------
In some cases, the Neighborhood Noise was measured to provide an indication
of background noise levels exceeded by the aircraft. These were average,
not peak readings. The Time Period indicates the beginning and ending times
for the series of measurements made at each location. Contained in paren-
thesis is the number of minutes within the time period. Average time be-
tween overflights indicates the repetitive nature of the noise at each
location for the time of day studied.
To summarize the noise data at each location, the high, low, and average
peak noise levels were calculated and reported. This was done separately
for all aircraft and for each type. The 727/737/DC-9 aircraft were grouped
together as having similar noise characteristics. Other aircraft types
grouped in a similar manner are DC-8/707/DC-8 STRETCH, DC-lO/L-1011, 747,
all business jets, all turbo prop aircraft, and all non-turbo prop planes.
The number of aircraft measured at each location is also indicated.
Graphical data taken at location Nos. 1,2, and 3 is presented following
each of the location reports. The horizontal axis on the graph indicates
time and the vertical axis the instantaneous noise level for each point
of time. A Noise Exposure Analysis based on each of the three graphical
data sets shows the time duration and the percentage of time that noise
exceeds each of two specified levels. The first level, 65 DBA, was chosen
as a sound pressure twice as loud as the normal neighborhood background
level of 55 DBA (a 10 DB increase appears as twice the loudness to the
human ear). The second level of 85 DBA was chosen as an annoying noise
level at which shouting at 2 feet is required in order to communicate.
-------
I £ ELK !_GRP\'E
i "" 1
.--.. .
« "- -. '' V" \
-------
\ " ,
^l--i-h--ferv#i,:\^'i/ s^-:- ^fjifij^ ^"W
t - i j. - ,^ i -^ v c- *A,',"\ *-(/ cf-»"iL_ j - r '(-ltrf£ i -* "- . X , .«., *" -
> .. ,;'i <- ; la'-.*" _?F'.>, :r# £i'\ -->- --.:--:-.- ii. c -\-:-'"
i. !=.'-,- '. ' i -;v,:J;\ t;/ - ^. --' ' sc. ' .- ; - Ox;:
-«- I ' V-"-""1"- |--W.Vv '"^o.b's,; - i_._^-_f-^-^ ; :x :tfj
, ;°7n..Y I i;;'iJ"''"1'r""VVVOCDLjI^J-= 5-,-Lii^- - --" - -V1-""-.
;r~ "r^T'^t jW" fSr'Sf^f H^i". .'" "v:'"'';-
^M^..,! //V,-,^ -i^i aJ ^V i_^v-'-"- '-=J- j| i i ^ ;
if-rj, ,/ // !j*" - i' 5 * -' - ^ *-" , , Bfi.pn--u
. >^ " //;,,., p,.,^ C-.^.-.-r I ' /, '."-"V," <""<>: c-v4i \5 *
T^v; ;-v-;':.^2_j^i^---Vr;T?-A V-"W
FOREST
PRESERVE
_ -r-i
: i ' f '-, ! .' -" ' ':" .- I \l°i i ' ' '. >*<'' ' ' ' ':'"''
-------
#1 LOCATION: 2032 Welwyn, Des PLaines, Illinois
(Near Birch and Howard)
DATE: August 24, 1972
WEATHER: Heavy overcast, 75 degrees, wind S.W. at 10 mph.
RUNWAY STUDIED: 22R, Landings
DISTANCE TO RUNWAY END (MILES): 1.7
OVERFLIGHT ANGLE (DEGREES): Overhead
NEIGHBORHOOD: Old, single family residential; heavy tree cover
*
NEIGHBORHOOD NOISE (DBA): -
TIME PERIOD (MIN.): 9:32 - 10:53 A.M. (81)
AVG. TIME BETWEEN OVERFLIGHTS (MIN.): 1.8
AIRCRAFT TYPE
NO.
PEAK NOISE (DBA)
HIGH AVG.
LOW
727/737/DC-9
707/DC-8/STRETCH
DC-10/L1011
BUSINESS JET
TURBO PROP
NON-TURBO PROP
ALL TYPES
21
7
2
3
6
6
45
97
102
88
88
87
78
102
92
97
86.5
86
84
74
88.9
85
87
85
84
81
68
68
COMMENTS: The resident at 2019 Welwyn permitted interior noise
readings to be made:
Door open - 73 DBA (707)
Windows and doors closed - 60 DBA (707)
The above interior noise levels greatly annoyed the
residents. They also stated that everytime a jet passes
over^their TV ghosts severely. They have not noticed an
improvement within the last year although they have heard
some of the quieter jets recently introduced. See Graphic
Level Recorder output data attached.
-------
^i
^
p
te.-.\.-~s?-.z.r.^L.\
-
S'
> 3 1 tT
fc t. ^,
I
.i
j L__L.
"T
LUi
<*
r^
*9'
5L
F?
;tM
-^
-------
o
I"
I
-V
I
i :
^
ZJ&L
M
"O
-------
o
Pi'
I
,v-
1__
J^
:_ |_
l I !
n i
r^v
'-53<7/:,
J9
it-
^cr
-------
NOISE EXPOSURE ANALYSIS FOR LOCATION NO. 1
10;24 - 10:54 A.M. AUG 24, 1972
AIRCRAFT TYPE TIME (SECONDS) DURING WHICH THE SPECIFIED NOISE
LEVELS WERE EXCEEDED FOR ONE OVERFLIGHT
65 DBA 85 DBA
DC-8/707/STRETCH 28 10
727/737/DC-9 24 6t
PROP JET 16 -
PERCENT OF TIME DURING WHICH THE SPECIFIED NOISE LEVELS WERE EXCEEDED
BY ALL OVERFLIGHTS BETWEEN 10:24 - 10:54 A.M. : 65 DBA - 24%
85 DBA - 4.27.
-------
LOCATION: Maine East Township High School, Park Ridge, Illinois
(East side of School)^
DATE: August 24, 1972
WEATHER: Cloudy, 78 degrees, wind S.W. at 12 mph
RUNWAY STUDIED: 22R, Landings
DISTANCE TO RUNWAY END (MILES): 3.5
OVERFLIGHT ANGLE (DEGREES): 65 - 75 degrees, Left
NEIGHBORHOOD: 5,000 student high school surrounded by residential
single and townhouse units
NEIGHBORHOOD NOISE (DBA):
TIME PERIOD (MIN.): 12:29 - 1:24 P.M. (55)
AVG. TIME BETWEEN OVERFLIGHTS (MIN.): 3.2
AIRCRAFT TYPE
NO.
PEAK NOISE (DBA)
HIGH AVG.
LOW
727/737/DC-9
707/DC-8/STRETCH
TURBO PROP
NON-TURBO PROP
ALL TYPES
9
1
3
4
17
88
80
74
94
84
94
78.6
72
80.9
80
78
63
63
COMMENTS: Interior noise measurements were made in the old section
of the school: Passage between buildings - 78 DBA (727)
1st floor, window closed - 58 DBA (727)
3rd floor, window closed - 69 DBA (727)
In an interview, the school nurse stated that teachers
had been bothered by the noise in certain classrooms.
See\ Graphic Level Recorder Data attached.
-------
fx.
pi
V]
h
T~
:t
i
}'
-t
in
i:....
- w
.+__
4r-
JOL
..._ j . _ r_
;Y
o^
.L
01
-------
#3 LOCATION: 2942 La Porte, Franklin Park, Illinois
(Near Grand and Wolf)-
DATE: August 24, 1972
WEATHER: Partly cloudy, 82 degrees, wind S.W. at 10 mph
RUNWAY STUDIED: 22L, Takeoff
DISTANCE TO RUNWAY END (MILES): 2.33
OVERFLIGHT ANGLE (DEGREES): Overhead and 50 degrees, Left
NEIGHBORHOOD: Old, single family residential
NEIGHBORHOOD NOISE (DBA):
TIME PERIOD (MIN.): 3:33 - 3:52 P.M. (19)
AVG. TIME BETWEEN OVERFLIGHTS (MIN.): 1
AIRCRAFT TYPE
(OVER HEAD)
NO.
PEAK NOISE (DBA)
HIGH AVG.
LOW
727/737/DC-9
707/DC-8/STRETCH
BUSINESS JET
ALL TYPES
AIRCRAFT TYPE
(50 DEGREES, LEFT)
727/737/DC-9
707/DC-8/STRETCH
BUSINESS JET
NON-TURBO PROP
ALL TYPES
2
2
1
5
NO.
8
1
1
1
11
95
96
96
HIGH
96
96
94.5
95
95
94.8
PEAK NOISE (DBA)
AVG.
87.6
86
82
63
93.2
94
94
94
LOW
74
63
COMMENTS: Resident stated that he had lived at the above location for
20 years and had become accustomed to the noise. He has
noticed the quieter DC-10 and 747 overflights.
-------
to
3
vs
a
?!
^
I
to
1
1
OJ
1
v//yVi
w
~r~
-------
( *
#4 LOCATION: Cindy and Forest, Des Plaines, Illinois
( 2 blocks North of Maine West High School)
DATE: August 24, 1972
WEATHER: Partly cloudy, 80 degrees, wind S.W. at 5 mph
RUNWAY STUDIED: 14L, Takeoff
DISTANCE TO RUNWAY END (MILES): 1.76
OVERFLIGHT ANGLE (DEGREES): Overhead
NEIGHBORHOOD: Grade School and suburban residential
NEIGHBORHOOD NOISE (DBA): 52
TIME PERIOD (MIN.): 5:25 - 6:01 P.M. (36)
AVG. TIME BETWEEN OVERFLIGHTS (MIN.): 13
AIRCRAFT TYPE
NO.
PEAK NOISE (DBA)
727/737/DC-9
707/DC-8/STRETCH
ALL TYPES
-
2
1
3
HIGH
86
92
AVG.
84
92
86.6
LOW
82
82
COMMENTS: In order to pass over this location, a sharp turn to the
North was required immediately after takeoff. Of 16 planes
measured, 3 veered over the above location. The average peak
sound for the other aircraft passing West of the location was
73 DBA.
-------
#5 LOCATION: Morse and Chestnut, Des Plaines, Illinois
(4 blocks N.W. of Mannheim and the N.W. Tollway)
DATE: August 24, 1972
WEATHER: Partly cloudy, 75 degrees, wind S.W. at 5 mph
RUNWAY STUDIED: 22R, Landings
DISTANCE TO RUNWAY END (MILES): .68 (3,590 feet)
OVERFLIGHT ANGLE (DEGREES): Overhead
NEIGHBORHOOD: Old, single family suburban ranch homes with tree cover;
O'Hare boundary and industrial park lie to the S.W.
NEIGHBORHOOD NOISE (DBA): -
TIME PERIOD (MIN.): 9:23 - 9:32 P.M. (9)
AVG. TIME BETWEEN OVERFLIGHTS (MIN.): 1.2
AIRCRAFT TYPE
NO.
PEAK NOISE (DBA)
HIGH AVG.
LOW
727/737/DC-9
707/DC-8/STRETCH
ALL TYPES
3
4
7
112
118
118
108
112
110.2
102
108
102
COMMENTS: This residential location was chosen as an example of
the highest noise level around O'Hare.
-------
LOCATION: Landmier Road and Dierting, Des Plaines, Illinois
(5 blocks N.W. of Touhy and Elmhurst)
DATE: Augr-i; It August 25, 1972
WEATHER: Pi^ly.,, ady, 75 degrees, wind S.W. at 5 mph
RUNWAY STUDIED: 14R, Takeoff
DISTANCE TO RUNWAY END (MILES): 1.78
OVERFLIGHT ANGLE (DEGREES): Overhead
NEIGHBORHOOD: Single family, suburban residential North of Landmier
Road; industrial park to the South.
NEIGHBORHOOD N.OT .- ,'i
TIME PERIOD u'ilN-,- 11:52 - 12:22 A.M. (30)
AVG. TIME BETWEEN OVERFLIGHTS (MIN.): 3
AIRCRAFT TYPE
NO.
PEAK NOISE (DBA)
HIGH AVG. LOW
727/737/DC-9
707/DC-8/STRETCH
NON-TURBO PROP
3
6
1
102
109
98.3
100.5
81
96
91
ALL TYPES
10
109
97.9
81
COMMENTS: NONE
-------
#7 LOCATION: Cumberland and Glendale, Park Ridge, Illinois
(Near Cumberland and T-194)
DATE: August 28, 1972
WEATHER: Clear sky, 75 degrees, and N.W. wind at 5 mph
RUNWAY STUDIED: 27R, Landings
DISTANCE TO RUNWAY END (MILES): 2.93
OVERFLIGHT ANGLE (DEGREES): 35 - 75 degrees, Left
NEIGHBORHOOD: Old, two-story, single family residential, heavy
tree cover
NEIGHBORHOOD NOISE (DBA): 50
TIME PERIOD (MIN.): 9:25 - 9:42 A.M. (17)
AVG. TIME BETWEEN OVERFLIGHTS (MIN.): 2.8
AIRCRAFT TYPE
NO.
PEAK NOISE (DBA)
HIGH AVG.
LOW
727/737/DC-9
NON-TURBO PROP
ALL TYPES
4
2
6
79
69
79
78.5
66
74
78
63
63
COMMENTS: This flight path is directly over the Kennedy Expressway.
-------
t -
#8 LOCATION: Bryn Mawr and Delphia, Chicago, Illinois
(2 blocks South of the Kennedy across from the Harriot Inn)
DATE: August 28, 1972
WEATHER: Clear sky, 82 degrees, N.W. wind at 5 mph
RUNWAY STUDIED: 27R, Landings
DISTANCE TO RUNWAY END (MILES): 2.55
OVERFLIGHT ANGLE (DEGREES): 50 - 80 degree, Right
NEIGHBORHOOD: Very dense residential with 3 story apartments and the
20 story Lamp Lighter Complex (all new)
NEIGHBORHOOD NOISE (DBA): 57
TIME PERIOD (MIN.): 10:18 - 11:18 A.M. (60)
AVG. TIME BETWEEN OVERFLIGHTS (MIN.): 3.3
AIRCRAFT TYPE
NO.
PEAK NOISE (DBA)
HIGH AVG.
LOW
?27/737/DC-9
707/DC-8/STRETCH
NON-TURBO PROP
ALL TYPES
10
5
3
18
87
94
77
94
82.7
90.6
73
83.2
75
82
67
67
COMMENTS: A British-West Indies 727 was 10 DBA quieter than an
American 727 at same altitude and location.
The flight path here is along the Kennedy Expressway.
-------
#9 LOCATION: 2009 Ashland, Park Ridge, Illinois
(Just North of the Ketmedy Expressway)
DATE: August 28, 1972
WEATHER: Clear sky, 82 degrees, N.W. wind at 5 mph
RUNWAY STUDIED: 27R, Landings
DISTANCE TO RUNWAY END (MILES): 3.3
OVERFLIGHT ANGLE (DEGREES): 70 - 85 degrees, Left
NEIGHBORHOOD: Close-spaced, single family, residential
NEIGHBORHOOD NOISE (DBA): 60 - 65
TIME PERIOD (MIN.): 10:25 - 10:45 A.M. (20)
AVG. TIME BETWEEN OVERFLIGHTS (MIN.): 5
AIRCRAFT TYPE
NO.
PEAK NOISE (DBA)
HIGH AVG. LOW
727/737/DC-9
707/DC-8/STRETCH
TURBO PROP
ALL TYPES
2
1
1
4
86
86
81.5
80
77
80
77
77
COMMENTS: Flight path is over the Kennedy Expressway.
-------
#10 LOCATION: 9540 Bryn Mawr, Rosemont, Illinois
(3 blocks West of River Road)
DATE: August 28, 1972
WEATHER: Clear sky, 85 degrees, N.W. wind at 5 mph
RUNWAY STUDIED: 27R, Landings
DISTANCE TO RUNWAY END (MILES): 1.28
OVERFLIGHT ANGLE (DEGREES): 35 - 50 degrees, Right
NEIGHBORHOOD: Trailer Park, farm house, and light industry
«,
NEIGHBORHOOD NOISE (DBA): 58
TIME PERIOD (MIN.): 11:11 - 11:44 A.M. (33)
AVG. TIME BETWEEN OVERFLIGHTS (MIN.): 3
AIRCRAFT TYPE
NO.
PEAK NOISE (DBA)
HIGH AVG.
LOW
727/737/DC-9
707/DC-8/STRETCH
NON-TURBO PROP
ALL TYPES
7
2
2
11
87
96
72
96
84.8
95.5
69.5
84
81
95
67
67
COMMENTS; Aircraft land over the Kennedy Expressway.
-------
t -
LOCATION: Oleander and Seminole, Chicago, Illinois
(Between Harlem and Canfield)
DATE: August 28, 1972
WEATHER: Clear sky, 85 degrees, wind N.W. at 5 mph
RUNWAY STUDIED: 27R, Landings
DISTANCE TO RUNWAY END (MILES): 3.77
OVERFLIGHT ANGLE (DEGREES): Directly overhead
NEIGHBORHOOD: Old, close packed residential, sing family dwellings
*
NEIGHBORHOOD NOISE (DBA): 58 (63 peak)
TIME PERIOD (MIN.): 11:31 - 12:14 P.M. (43)
AVG. TIME BETWEEN OVERFLIGHTS (MIN.): 2.1
AIRCRAFT TYPE
NO.
PEAK NOISE (DBA)
HIGH AVG.
LOW
727/737/DC-9
707/DC-8/STRETCH
L1011/DC-10
NON-TURBO PROP
ALL TYPES
11
3
1
5
20
88
88
71
88
79
88
82
69.2
78.1
74
67
69
COMMENTS: At 5724 North Oleander, resident stated that the planes
fly lower and louder more on some days than others. She
stated that the noise levels the Environmental Protection
Agency measured were lower than normal. For her, the
greatest annoyance is between 4:00 P.M. and 9:00 P.M.
She has felt no relief since the introduction of the DC-10
and^ L-1011 because large numbers of 707's still pass over-
head.
-------
#12 LOCATION: 10217 McNerney Drive, Franklin Park, Illinois
(Near Mannheim and the Tri-State)
DATE: August 28, 1972
WEATHER: Clear sky, 85 degrees, wind N.W. at 5 mph
RUNWAY STUDIED: 32L, Landings
DISTANCE TO RUNWAY END (MILES): 1>8
OVERFLIGHT ANGLE (DEGREES): Overhead
NEIGHBORHOOD: Small homes, very closely packed
NEIGHBORHOOD NOISE (DBA):
TIME PERIOD (MIN.): 12:45 - 1:45 P.M. (60)
AVG. TIME BETWEEN OVERFLIGHTS (MIN.): 2
AIRCRAFT TYPE
NO.
PEAK NOISE (DBA)
HIGH AVG.
LOW
727/737/DC-9
707/DC-8/STRETCH
TURBO PROP
NON-TURBO PROP
21
4
1
4
97
105
81
94.4
100.5
88
78.2
91
97
75
ALL TYPES
31
105
93
75
COMMENTS: NONE
-------
( "
LOCATION: West Greenvalley and North Spruce, Bensenville, Illinois
(2 blocks North of Rou-tes 19 and 83)
DATE: August 28, 1972
WEATHER: Partly cloudy, 88 degrees, wind N. W. at 7 mph
RUNWAY STUDIED: 9R, Takeoff
DISTANCE TO RUNWAY END (MILES): 2.02
OVERFLIGHT ANGLE (DEGREES): 80 - 85 degrees, Left
NEIGHBORHOOD: Single family, suburban residential
*
NEIGHBORHOOD NOISE (DBA):
TIME PERIOD (MIN.): 1:13 - 1:26 P.M. (13)
AVG. TIME BETWEEN OVERFLIGHTS (MIN.): 2.1
AIRCRAFT TYPE
NO.
PEAK NOISE (DBA)
HIGH AVG.
LOW
727/737/DC-9
707/DC-8/STRETCH
5
1
96
90.4
103
87
ALL TYPES
103
92.5
87
COMMENTS: NONE
-------
#14
LOCATION: Addison and Irving Park, Woodale, Illinois
DATE: August 28, 1972
WEATHER: Partly cloudy, 88 degrees, wind N.W. 8 mph
RUNWAY STUDIED: 9R, Takeoff
DISTANCE TO RUNWAY END (MILES): 3.57
OVERFLIGHT ANGLE (DEGREES): 75 - 90 degrees, Right
NEIGHBORHOOD: Vacant land to the North; old, suburban residential
to the South
NEIGHBORHOOD NOISE (DBA):
TIME PERIOD (MIN.): 1:35 - 1:58 P.M. (23)
AVG. TIME BETWEEN OVERFLIGHTS (MIN.): 3.8
AIRCRAFT TYPE
NO.
PEAK NOISE (DBA)
HIGH AVG.
LOW
727/737/DC-9
707/DC-8/STRETCH
ALL TYPES
I
2
3
95
95
87
92
90.3
89
87
COMMENTS: 3 of the 6 planes observed veered to 30 - 45 degrees, right.
The average peak noise for these planes was 78.3 DBA.
A large quantity of undeveloped land lies North of Irving
Park Road to Thorndale Avenue.
-------
#15 LOCATION: 16 West 164th Foster, Woodale, Illinois
(West of Route 83 between Irving Park and Thorndale)
DATE: August 28, 1972
WEATHER: Partly cloudy, 88 degrees, wind N.W. at 8 mph
RUNWAY STUDIED: 9R, Takeoff
DISTANCE TO RUNWAY END (MILES): 2.17
OVERFLIGHT ANGLE (DEGREES): 75 - 85 degrees, Right
NEIGHBORHOOD: Suburban, single family residential; there is a large
cornfield N. W. of the above location
NEIGHBORHOOD NOISE (DBA):
TIME PERIOD (MIN.): 2:20 - 2:38 P.M. (18)
AVG. TIME BETWEEN OVERFLIGHTS (MIN.): 3
AIRCRAFT TYPE NO. PEAK NOISE (DBA)
HIGH AVG. LOW
727/737/DC-9
ALL TYPES
2
2
Same
95 89.5
84
COMMENTS: The average of 3 other aircraft veering at 30 - 45 degrees,
Right was 74.6 DBA for 727's.
The resident at the above location complained of severe
annoyance, especially from 3:00 - 5:00 P.M. and in the middle
of his sleep. He also stated that landings were louder than
takeoffs and the above data represents a quiet day for him.
------- |