Appendix C to Part 29 - Icing Certification
14:1.0.1.3.15.9.283.1.27 : Appendix C
Appendix C to Part 29 - Icing Certification
(a) Continuous maximum icing. The maximum continuous
intensity of atmospheric icing conditions (continuous maximum
icing) is defined by the variables of the cloud liquid water
content, the mean effective diameter of the cloud droplets, the
ambient air temperature, and the interrelationship of these three
variables as shown in Figure 1 of this appendix. The limiting icing
envelope in terms of altitude and temperature is given in Figure 2
of this appendix. The interrelationship of cloud liquid water
content with drop diameter and altitude is determined from Figures
1 and 2. The cloud liquid water content for continuous maximum
icing conditions of a horizontal extent, other than 17.4 nautical
miles, is determined by the value of liquid water content of Figure
1, multiplied by the appropriate factor from Figure 3 of this
appendix.
(b) Intermittent maximum icing. The intermittent maximum
intensity of atmospheric icing conditions (intermittent maximum
icing) is defined by the variables of the cloud liquid water
content, the mean effective diameter of the cloud droplets, the
ambient air temperature, and the interrelationship of these three
variables as shown in Figure 4 of this appendix. The limiting icing
envelope in terms of altitude and temperature is given in Figure 5
of this appendix. The interrelationship of cloud liquid water
content with drop diameter and altitude is determined from Figures
4 and 5. The cloud liquid water content for intermittent maximum
icing conditions of a horizontal extent, other than 2.6 nautical
miles, is determined by the value of cloud liquid water content of
Figure 4 multiplied by the appropriate factor in Figure 6 of this
appendix.
[Amdt. 29-21, 48
FR 4393, Jan. 31, 1983]