Pt. 29, App. C

14 CFR Ch. I (1-1-19 Edition)

(a) Limitations. The approved IFR flight envelope, the IFR flightcrew composition, the
revised kinds of operation, and the steepest
IFR precision approach gradient for which
the helicopter is approved;
(b) Procedures. Required information for
proper operation of IFR systems and the recommended procedures in the event of stability augmentation or electrical system
failures; and
(c) Performance. If VYI differs from VY,
climb performance at VYI and with maximum
continuous power throughout the ranges of
weight, altitude, and temperature for which
approval is requested.
[Amdt. 29-21, 48 FR 4392, Jan. 31, 1983, as
amended by Amdt. 29-31, 55 FR 38967, Sept.
21, 1990; 55 FR 41309, Oct. 10, 1990; Amdt. 29-
40, 61 FR 21908, May 10, 1996; Amdt. 29-51, 73
FR 11002, Feb. 29, 2008]

APPENDIX C TO PART 29 - ICING
CERTIFICATION

spaschal on DSK3GDR082PROD with CFR

(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.

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