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region specified in 3.11.5.2.2.1.2 except where degradation is allowed as specified in 3.11.4.9.4.3.
3.11.4.9.4.3 Degradation allowance. The approach azimuth angular PFE, PFN and CMN shall be allowed to degrade
linearly to the limits of coverage as follows:
a) With distance. The PFE limit and PFN limit, expressed in angular terms at 37 km (20 NM) from the runway
threshold along the extended runway centre line, shall be 2 times the value specified at the approach reference
datum. The CMN limit shall be 0.1 degree at 37 km (20 NM) from the approach reference datum along the extended
runway centre line at the minimum glide path angle.
b) With azimuth angle. The PFE limit and PFN limit, expressed in angular terms at plus or minus 40 degrees azimuth
angle, shall be 1.5 times the value on the extended runway centre line at the same distance from the approach
reference datum. The CMN limit, expressed in angular terms at plus or minus 40 degrees azimuth angle is 1.3 times
the value on the extended runway centre line at the same distance from the approach reference datum.
c) With elevation angle. The PFE limit and PFN limit shall not degrade up to an elevation angle of 9 degrees. The PFE
limit and PFN limit, expressed in angular terms at an elevation angle of 15 degrees from the approach azimuth
antenna phase centre, shall be 2 times the value permitted below 9 degrees at the same distance from the approach
reference datum and the same azimuth angle. The CMN limit shall not degrade with elevation angle.
d) Maximum CMN. The CMN limits shall not exceed 0.2 degree in any region of coverage.
3.11.4.9.4.3.1 Recommendation.— The CMN should not exceed 0.1 degree in any region of coverage.
3.11.4.9.4.4 Maximum angular PFE and PFN. In any region within coverage, the angular error limits shall be as
follows:
a) the PFE shall not exceed plus or minus 0.25 degree; and
b) the PFN shall not exceed plus or minus 0.15 degree.
3.11.4.9.5 Back azimuth guidance function. At the back azimuth reference datum, the back azimuth function shall
provide performance as follows:
a) the PFE shall not be greater than plus or minus 6 m (20 ft);
b) the PFN component shall not be greater than plus or minus 3.5 m (11.5 ft);
c) the CMN shall not be greater than plus or minus 3.2 m (10.5 ft) or 0.1 degree, whichever is less.
3.11.4.9.5.1 Degradation allowance. The back azimuth angular PFE, PFN and CMN shall be allowed to degrade
linearly to the limits of coverage as follows:
a) With distance. The PFE limit and PFN limit, expressed in angular terms at the limit of coverage along the extended
runway centre line, shall be 2 times the value specified at the back azimuth reference datum. The CMN limit,
expressed in angular terms at 18.5 km (10 NM) from the runway stop end along the extended runway centre line,
shall be 1.3 times the value specified at the back azimuth reference datum.
b) With azimuth angle. The PFE limit and PFN limit, expressed in angular terms at plus or minus 20 degrees azimuth
angle, shall be 1.5 times the value on the extended runway centre line at the same distance from the back azimuth
reference datum. The CMN limit, expressed in angular terms at plus or minus 20 degrees azimuth angle, shall be 1.3
times the value on the extended runway centre line at the same distance from the back azimuth reference datum.
Chapter 3 Annex 10 — Aeronautical Communications
3-87 23/11/06
c) With elevation angle. The PFE limit and PFN limit shall not degrade up to an elevation angle of 9 degrees. The PFE
limit and PFN limit, expressed in angular terms at an elevation angle of 15 degrees from the back azimuth antenna
phase centre, shall be 2 times the value permitted below 9 degrees at the same distance from the back azimuth
reference datum and the same azimuth angle. The CMN limit shall not degrade with elevation angle.
d) Maximum CMN. The CMN limits shall not exceed 0.2 degree in any region of coverage.
3.11.4.9.5.2 Maximum angular PFE and PFN. In any region within coverage, the angular error limits shall be as
follows:
a) the PFE shall not exceed plus or minus 0.50 degree; and
b) the PFN shall not exceed plus or minus 0.30 degree.
3.11.4.9.6 Elevation guidance function. For equipment sited to provide a minimum glide path of nominally 3 degrees
or lower, the approach elevation function shall provide performance at the approach reference datum as follows:
a) the PFE shall not be greater than plus or minus 0.6 m (2 ft);
b) the PFN shall not be greater than plus or minus 0.4 m (1.3 ft);
c) the CMN shall not be greater than plus or minus 0.3 m (1 ft).
3.11.4.9.6.1 Degradation allowance. The approach elevation angular PFE, PFN and CMN shall be allowed to degrade
linearly to the limits of coverage as follows:
　
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