Close book Final guide - Exercise 16 Database File...

Exercise 16 - Database File Manipulations Outside of INM
1. **In the noise exposure map below, the red contour represents airport operations which
included a Stage 2 Lear 25 and the green contour represents airport operations which
replaced the Lear 25 operations with Stage 3 Cessna Citation Bravo (CNA55B) operations.
Analyze and interpret the noise contours considering the operations changes. Use the
Contour Area and Population (CAP) tables to support your analysis and interpretation.
From the NEM it can be seen the 65 dBA contour line representing the Lear 25 covers a greater
area than that of the CNA55B going outwards from the runways. This is evidence that the Lear
25 is the noisier aircraft of the two. This is supported by the CAP tab;es because the CNA55B
cover a less area in acreage than the Lear 25 in reference to area exposed to 65 dBa and above.
6a63f3d05d6eb6a30fffec460a01f04e2a31bdb0
16:30:21
1

Area Equivalent Method (AEM)
1. According to FAA Order 1050.lE, “Policies and Procedures for Considering Environmental
Impacts,” an assessment must be made to determine the noise impact of a proposed airport
action. This assessment compares the present noise impact on the environment with that of
the proposed change. If the noise impact is significant , DNL 1.5 __ dBA increase at noise
sensitive areas, then the FAA requires an ___ environmental impact statement (EIS) __. If
the increase of noise impact on the community is not significant then the FAA prepares a
_____ findning of no significant impact(FONSI) _____, which briefly outlines the
specifications of the change in airport operations for that particular airport.
2. If the AEM model detects a 17 _% increase in contour area, the top row DNL 65 dBA
“Change in Area” will become highlighted by turning red (color) thus alerting the user that
the proposed action could result in a significant impact. At this stage, the comparison of
baseline to alternative is beyond the scope of a simple model and a more detailed analysis
using the INM (computer program) would be required.