MONITORING GOALS

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MONITORING GOALS
Presentation 17

• Dale Livingston
• FAA Technical Center
• Atlantic City, New Jersey

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SAFETY GOALS

• Basis for Safety Goals - Adherence to Manual on
  Implementation of a 300 m (1,000 ft) Vertical
  Separation Minimum Between FL 290 and FL 410
  Inclusive (Doc 9574, Second Ed.)
• Doc 9574 Global System Performance Specification
  based on application of collision risk
  methodology
• ICAOs Review of the General Concept of
  Separation Panel (RCGSP) intended Doc 9574
  provide for safe RVSM implementation in the future

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TWO ASPECTS OF SAFETY GOALS

• Need to ensure that individual operators and
  aircraft meet applicable safety goals
• Need to ensure that North American airspace
  system as a whole meets applicable safety goal -
  the Target Level of Safety (TLS)
• Monitoring of aircraft height-keeping performance
  assists in confirming that both aspects of safety
  goals are satisfied

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MONITORING PERFORMANCE-THE MAJOR PROBLEM
FL 350 Constant Pressure Altitude
FL 350 Geometric Height
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HEIGHT-KEEPING PERFORMANCE ERRORS
FL 350 Geometric Height
Total Vertical Error (TVE)
Altimetry System Error Assigned
Altitude Deviation ASE AAD
Aircraft geometric height
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MONITORING AND THE STATE APPROVAL PROCESS

• GPS-based Monitoring System (GMS), improved with
  enhanced GPS Monitoring Unit, plays a prominent
  role in supporting operator/aircraft satisfaction
  of monitoring requirements associated with RVSM
  approval process
• Focus on monitoring requirements for RVSM approval

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GPS Monitoring Unit (GMU)
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Typical GMU Installation
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GPS-Based Monitoring SystemData Flow
Airborne GPS-based Monitoring Unit (GMU)
Remote Reference Station
Differential Data
Flight Information Form (FIF)
Post-flight Processing Station
Data Transmitted Post-Flight
Via Internet/Direct
Flight Information Form (FIF)
FAA Technical Center Database
Database (Monitoring Results)
Vertical Error Processing FAA Technical Center
ASE Results
Mode C Data
Meteorological Data (Height of flight level)
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Vertical Error Calculation Process
Determine Aircraft Geometric Height
GMU
TVE (Total Vertical Error)
GPS Reference Station
ASE (Altimetry System Error)
Determine Flight Level (FL) Height
Meteorological Data
Cleared FL (FIF)
AAD (Assigned Altitude Deviation)
Mode C Data
Compare Cleared FL to Actual Altitude
Cleared FL (FIF)
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Height Monitoring Unit (HMU)

• Ground-based system capable of monitoring
  height-keeping performance of an aircraft within
  (roughly) 40-nm of ground stations and producing
  estimate of ASE in near real-time
• Advantage able to monitor large number of
  aircraft per day (conceptually, all which pass
  over ground stations)
• Disadvantage aircraft must fly over HMU site

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MONITORING SYSTEMS AND THE TWO ASPECTS OF SAFETY
GOALS

• Ground-based systems to estimate aircraft
  geometric height now under development
• Expect that outputs of these systems will help
  satisfy need for large quantity of aircraft
  height-keeping performance data necessary for
  examining satisfaction of TLS
• Anticipate that existing GPS-based Monitoring
  System (GMS), improved with enhanced GPS
  Monitoring Unit, will play prominent role in
  supporting operator/aircraft satisfaction of
  monitoring requirements associated with RVSM
  approval process
• Focus now on monitoring requirements for RVSM
  approval

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MONITORING GOALS ASSOCIATED WITH STATE RVSM
APPROVAL
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MINIMUM AIRCRAFT SYSTEM PERFORMANCE SPECIFICATION
(MASPS)

• Performance which aircraft group must be capable
  of achieving in service, regardless of airspace
  where RVSM is applied
• Mean altimetry system error (ASE) of the group lt
  80 ft in magnitude
• Sum of the absolute value of the mean plus 3
  standard deviations of ASE for group lt 245 ft
• Errors in altitude-keeping symmetric about a mean
  of 0 ft, have a standard deviation lt 43 ft
  and have error frequency which decreases at least
  exponentially with increasing error magnitude

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Monitoring Goals

• INITIAL MONITORING. In application to the
  appropriate State authority for RVSM approval,
  operators must show plan for meeting monitoring
  requirements necessary to receive RVSM approval.
• AIRCRAFT STATUS FOR MONITORING. RVSM
  airworthiness approval must be granted prior to
  an aircraft being monitored. Any exception to
  this rule will be coordinated with the State
  authority.
• FOLLOW-ON MONITORING. Monitoring will continue
  after initial RVSM implementation. A follow-on
  sampling program for additional operator aircraft
  will be defined later.

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SATISFACTION OF MONITORING GOALS

• NAARMO will administer DRVSM monitoring program.
• NAARMO has access to NAT, Asia Pacific and
  Eurocontrol monitoring results - monitoring
  results obtained from other Regions applicable to
  satisfaction of DRVSM monitoring requirements
• NAARMO will coordinate with States and operators
  regarding individual-operator monitoring
  requirements
• NAARMO will coordinate with States to confirm
  satisfaction of individual-operator requirements.

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MONITORING GOALS
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MONITORING GOALS II
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MONITORING GOALS III
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Process to Perform Monitoring

• See North Atlantic or WATRS sections of RVSM
  Documentation page
• See RVSM Aircraft Height Keeping Performance
  Monitoring Procedures
• Will be added to new US DRVSM section as soon as
  possible