682 

14 CFR Ch. I (1–1–19 Edition) 

Pt. 29, App. C 

(a) 

Limitations. 

The approved IFR flight en-

velope, 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 rec-
ommended procedures in the event of sta-
bility augmentation or electrical system 
failures; and 

(c) 

Performance. 

If V

YI

differs from V

Y

, 

climb performance at V

YI

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] 

A

PPENDIX

C 

TO

P

ART

29—I

CING

 

C

ERTIFICATION

 

(a) 

Continuous maximum icing. 

The max-

imum continuous intensity of atmospheric 
icing conditions (continuous maximum 
icing) is defined by the variables of the cloud 
liquid water content, the mean effective di-
ameter 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 interrelation-
ship of cloud liquid water content with drop 
diameter and altitude is determined from 
Figures 1 and 2. The cloud liquid water con-
tent for continuous maximum icing condi-
tions 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 inter-

mittent maximum intensity of atmospheric 
icing conditions (intermittent maximum 
icing) is defined by the variables of the cloud 
liquid water content, the mean effective di-
ameter 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 interrelation-
ship of cloud liquid water content with drop 
diameter and altitude is determined from 
Figures 4 and 5. The cloud liquid water con-
tent for intermittent maximum icing condi-
tions of a horizontal extent, other than 2.6 
nautical miles, is determined by the value of 
cloud liquid water content of Figure 4 multi-
plied by the appropriate factor in Figure 6 of 
this appendix. 

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