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2.2.2 c) 14 CFR Part 36 imposes a limit of 14 dB/100 meters in the 8 kHz one.third octave band when the temperature and dew point are measured with a device which is accurate to within one.half a degree Celsius.
2.2.3 14 CFR Part 36 requires that the limitations on the temperature and relative humidity test window must apply over the whole noise propagation path between a point 10 meters above the ground and the helicopter. Annex 16 specifies that the limitations on the temperature and relative humidity test window apply only at a point 10 meters above the ground. 14 CFR Part 36 requires that corrections for sound attenuation must be based on the average of temperature and relative humidity readings at 10 meters and the helicopter. Annex 16 implies that the corrections for sound absorption are based on the temperature and relative humidity measured at 10 meters only.
3.2.6 No equivalent requirement.
3.4.5 For each detector/integrator the response to a sudden onset or interruption of a constant sinusoidal signal at the respective one.third octave band center frequency must be measured at sampling times 0.5, 1.0, 1.5, and 2.0 seconds after the onset or interruption. The rising responses must be the following amounts before the steady.state level: 0.5 seconds: 4.0 ± 1.0 dB 1.0 seconds: 1.75 ± 0.75 dB 1.5 seconds: 1.0 ± 0.5 dB 2.0 seconds: 0.6 ± 0.5 dB
3.4.5 (Note 1) No equivalent provision in 14 CFR Part 36.
3.5.2 No equivalent requirement.
5.4 14 CFR Part 36 requires that the difference between airspeed and groundspeed shall not exceed 10 kt between the 10 dB down time period.
8.4.2 14 CFR Part 36 specifies a value of .10 in the adjustment for duration correction. Annex 16 specifies a value of .7.5.
9.1.2, 9.1.3 14 CFR Part 36 always requires use of the integrated procedure if the corrected take.off or approach noise level is within 1.0 dB of the applicable noise limit.
Appendix 6
4.4.1 The microphone performance, not its dimensions, is specified. The microphone must be mounted 1.2 meters (4 feet) above ground level. A windscreen must be employed when the wind speed is in excess of 9 km/h (5 kt).
5.2.2 a) Reference conditions are different. Noise data outside the applicable range must be corrected to 77 degrees F and 70 percent humidity.
5.2.2 c) There is no equivalent provision in 14 CFR Part 36. Fixed.pitch propeller.driven airplanes have a special provision. If the propeller is fixed.pitch and the test power is not within 5 percent of reference power, a helical tip Mach number correction is required.
ANNEX 16 . ENVIRONMENTAL PROTECTION
VOLUME II . AIRCRAFT ENGINE EMISSIONS
Chapter 1
The U.S. currently has regulations prohibiting intentional fuel venting from turbojet, turbofan and turboprop aircraft, but we do not now have a regulation preventing the intentional fuel venting from helicopter engines.
ANNEX 17 . SECURITY . SAFEGUARDING INTERNATIONAL CIVIL AVIATION AGAINST ACTS OF UNLAWFUL INTERFERENCE
There are no reportable differences between U.S. regulations and the Standards and Recommended Practices contained in this Annex.
ANNEX 18 . THE SAFE TRANSPORT OF DANGEROUS GOODS BY AIR
Adopted by the ICAO Council 6/26/81
Effective Date: 1/1/83
Applicability Date: 1/1/84
(Note: Differences are to be filed with ICAO by 6/1/83).
PANS ATM Doc 4444
There are several substantive differences between the U.S. procedures and those of ICAO, in addition to some minor variations in detail which are not considered significant. These differences are the result of initiatives and/or refinements which the U.S. has effected in the interest of improving the safety and efficiency of air traffic.
PAN ATM Doc 4444 15th Edition 7110.65 S
CHAPTER 1 Definitions
Definitions U.S. uses Word Meanings, Definitions (PG Glossary) and Abbreviations
Affirm U.S. has no phraseology using “AFFIRM”. U.S. uses “AFFIRMATIVE”. “Yes”. ; or “ACKNOWLEDGE; or Roger, Wilco”
Airborne Collision Avoidance System The U.S. uses traffic alert and collision avoidance system (TCAS).
Aircraft U.S. uses “Aircraft” to mean the airframe, crew members, or both.
AIRMET In the U.S., AIRMET stands for Airman’s Meteorological Information which is in.flight weather advisories issued only to amend the area forecast concerning weather phenomena which are of operational interest to all aircraft and potentially hazardous to aircraft having limited capability because of lack of equipment, instrumentation, or pilot qualifications. AIRMETs concern weather of less severity than that covered by SIGMETs or convective SIGMETs. AIRMETs cover moderate icing, moderate turbulence, sustained winds of 30 kt or more at the surface, widespread areas of ceilings less than 1,000 feet and/or visibility less than 3 miles, and extensive mountain obscurement.
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