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 Table 7 (Continued)
Summary of Far-Field and Interior Noise Levels
of Full-Scale Test Facilities
Notes:
1
Position is 250 ft (76.2 m) from engine exhausts: 0 deg. is forward,
180 deg. is aft. Microphones are on the same side of aircraft centerline
as is the operating engine.
2
Positions are approximately on a line parallel to the engine axis.
Position 4 is approximately in the plane of the engine exhaust for F-4;
position 3 is approximately mid-engine; position is forward in the cell;
position is between positions 1 and 3.
3
Measurements at Miramar No. 1 were performed every 14 deg. around 250-ft
circle. Data are tabulated for closest standard position; except, data
for 90 deg. are average of data from measurements at 83 deg. and 97 deg.
4
Personnel door was open, resulting in abnormally high levels at these
positions. These positions were excluded when tabulating maximum level.
5
Throttle ring installed.
6
Throttle ring removed.
7
Data possibly affected by obstruction (buildings) within or on the 250-ft
acircle.
8
A-weighted level affected by "screech", a tone in the noise spectrum,
related to interaction of shock fronts, which is an abnormal condition.
50
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