Prepared by '' SDIA Airport Noise Mitigation Office

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Noise 101, Part 6 What exactly is Stage 3?
Prepared by .. SDIA Airport Noise Mitigation
Office
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Overview

• In late 1960s, increasing noise complaints from
  communities due to the introduction of jet
  aircraft led Congress to require FAA to impose
  rules to control aircraft noise.
• 1972 Noise Control Act - reaffirmed and
  strengthened amendment to Federal Aviation Act

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Congressional Mandate

• FAA wrote regulations implementing Congressional
  legislation
• Designed a system to categorize large, commercial
  air service aircraft by the amount of noise
  produced (Stage 1 Stage 3)
• Addressed the phase out of Stage 1 and 2 aircraft
  by January 1, 2000

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FAA Classification

• The FAA classifies aircraft into three stages for
  clarification Stage 1, 2, and 3 in order from
  loudest to the least noisiest.
• Noise levels for Stage definition of aircraft are
  measured at three points. These points are
  designed to measure noise levels for take-off,
  approach, and flyovers (sideline). Furthermore,
  classification is also based on the aircraft
  weight and number of engines.

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Maximum Noise Limit Range
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First generation jet aircraft Stage 1
Boeing 707
Douglas DC-8
Boeing 737-100
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Boeing 727
Second Generation Jets
DC-9
Stage 2
Boeing 747
Boeing 737-200
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Noise Contour Comparison
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AIRBUS 300
MD-90
Stage 3
Boeing 757
Boeing 767F
MD-80
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Stage 3 Criteria

• Affects large, commercial air service aircraft
  GTW gt75,000 lbs operate in the continental U.S.
  Foreign carriers must meet this requirement on
  the aircraft they operate in the U.S.
• All such aircraft must meet the noise
  requirements of Stage 3 not later than January 1,
  2000

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Factors Affecting Stage 3

• Aircraft weight
• The heavier the airplane the more noise it is
  allowed to make and still be Stage 3
• Number and type of engines
• The more engines the airplane has the more noise
  it can make and still be Stage 3
• Exempts all business jets GTW lt75,000 lbs.

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Stage 3
Stage 2
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Methods to meet Stage 3

• Replace older aircraft with new Stage 3
  certificated airplanes (change fleet mix)
• Re-certificate existing aircraft with new engines
  that meet Stage 3 requirements
• Modify existing engines to meet Stage 3
  requirements (Hushkit)
• Artificially limit GTW to allow it to conform to
  Stage 3 noise standards

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Hushkit equipped
Boeing 727
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Hushkitted Boeing 727
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Airbus 330
Boeing 7E7
Canadair Regional Jet (CRJ)
Airbus 320
And Beyond
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Whats next Stage 4

• Chapter (Stage) 4 noise standard established and
  adopted by ICAO in 2002. FAA issued a NPRM in
  March 2004 which parallels ICAO standard
• Applies to all NEW airplane designs on or after
  Jan 1, 2006
• Imposes a requirement that designs must produce
  noise levels 10 decibels lower than Stage 3

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Stage 4 capable
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Caveat

• Federal Aviation Administration (FAA) noted that
  U.S. adoption of Stage 4 "is not intended to
  signal the start of any rulemaking or other
  proceeding aimed at phasing out the production or
  operation of current aircraft models.

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