ANNEX 5 . UNITS OF MEASUREMENT TO BE USED IN AIR.GROUND COMMUNICATIONS
General Statement: Most of the individual SI quantities and measurement units listed in the Annex are not commonly used in routine international air operations. Although most U.S. national standards and practices do not specifically utilize the SI units, the SI units of measurement are acceptable and not prohibited from use by U.S. regulations. Under the present operational practices, these differences are not significant and are identified in U.S. Aeronautical Information and Technical Publications. In accordance with Article 38 of the Convention, the U.S. wishes to file the enclosed Notice of Differences to Annex 5, Fourth Edition, as amended by Amendment 13. Only those differences recognized as necessary for the safety or regularity of international air navigation and required for day.to.day operations in U.S. airspace are listed separately in this notification. In addition, we do not support the establishment of dates for planning purpose for termination of the use of bar, knot, nautical mile, and foot. (Chapter 4, Table 4.1) Until sufficient operational analysis identifies and resolves the safety issues, the establishment of termination dates for use of the bar, knot, nautical mile, and foot is unacceptable.
Reference: Table 3.4, Chapter 3, Annex 5, Fourth Edition, as Amended by Amendment 13.
Chapter 3 Standard application of units of measurement
3.2.2 Table 3.3 Table 3.4 Table 3.4 Ref 1.12, runway length and Ref 1.13 runway visual range, unit of measure is in feet. Table 3.4 Ref 1.16, visibility unit of measure is statute miles (SM). Table 3.4 Ref 3.2, altimeter setting, unit of measure is reported as inches of mercury. Table 3.4, Ref 3.3, atmospheric pressure, unit of measure is in inches of mercury.
Chapter 3.3 (Table 3.4)
Ref. No. Quantity Unit (SI) Differences as of 5 January 1988
1.4 distance (short) meter foot
1.12 runway length meter foot
1.13 runway visual range meter foot
1.15 time hour and minute, the day of 24 hours beginning at midnight UTC Time may be given in local time
1.16 visibility kilometer statute mile and fraction
2.12 mass (weight) kilogram pound (lb)
3.2 altimeter setting hectopascal inches of mercury
6.7 temperature °C C° except Fahrenheit used for surface air and dew point temperature
10.1 absorbed dose Gy rd
10.2 absorbed dose rate Gy/s rd/s
10.4 dose equivalent Sv rem
10.5 radiation exposure C/kg R
10.6 exposure rate C/kg.s R/s
All non.SI alternative units listed in this table will continue to be utilized where permitted. (1.1, 1.3, 1.5, 1.7, 4.1, 4.7, 4.15, 4.16)
Attachment B Guidance on the application of System of Units (SI)
5.4.2 Specifications differ from Attachment B, Style and usage, Para 5.4 Numbers. Comma is not acceptable as a decimal marker. Comma is used to separate digits in groups of three.
ANNEX 6 . OPERATION OF AIRCRAFT
PART I
Chapter 1 Definitions
Aerodrome operating minima This term is not used in the U.S.
Category I (Cat I) operation For a Category I operation, the U.S. requires a decision height (DH) of not less than 200 feet and either visibility of not less than 1/2 mile or a runway visual range of 2,400 feet (RVR 1,800 feet with operative touchdown zone and runway centerline lights).
Category II (Cat II) operation The U.S. requires that Category II provide approaches to minima of less than 200 feet decision height/2,400 runway visual range to as low as 100 feet decision height/1,200 feet runway visual range.
Category IIIA (Cat IIIA) operation U.S. criteria are the same as those adopted in Part 1 of Annex 6. However, the runway visual range is expressed as not less than 700 feet (200 meters).
Category IIIB (Cat IIIB) operation U.S. criteria are the same as those adopted in Part 1 of Annex 6. However, the runway visual range is expressed as less than 700 feet (200 meters) but not less than 150 feet (50 meters).
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