spaschal on DSK3GDR082PROD with CFR

Pt. 25, App. O

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

maximum icing conditions defined in Appendix C of this part.
(2) Holding ice is the holding ice defined by
part II, paragraph (c)(4), of this Appendix, for
an airplane certified in accordance with
Section 25.1420(a)(2), or defined by part II, paragraph
(a)(4), of Appendix C of this part, for an airplane
certified
in
accordance
with
Section 25.1420(a)(1), plus:
(i) Pre-detection ice as defined by part II,
paragraph (b)(5), of this Appendix; and
(ii) The ice accumulated during the transit
of one cloud with a 17.4 nautical miles horizontal extent in the most critical of the
icing conditions defined in part I of this Appendix and one cloud with a horizontal extent of 17.4 nautical miles in the continuous
maximum icing conditions defined in Appendix C of this part.
(iii) Except the total exposure to holding
ice conditions does not need to exceed 45
minutes.
(3) Approach ice is the more critical of the
holding ice defined by part II, paragraph
(b)(2), of this Appendix, or the ice calculated
in the applicable paragraphs (b)(3)(i) or (ii) of
part II, of this Appendix:
(i) For an airplane certified in accordance
with Section 25.1420(a)(2), the ice accumulated during descent from the maximum vertical extent of the icing conditions defined in part I
of this Appendix to 2,000 feet above the landing surface in the cruise configuration, plus
transition to the approach configuration,
plus:
(A) Pre-detection ice, as defined by part II,
paragraph (b)(5), of this Appendix; and
(B) The ice accumulated during the transit
at 2,000 feet above the landing surface of one
cloud with a horizontal extent of 17.4 nautical miles in the most critical of the icing
conditions defined in part I of this Appendix
and one cloud with a horizontal extent of 17.4
nautical miles in the continuous maximum
icing conditions defined in Appendix C of
this part.
(ii) For an airplane certified in accordance
with Section 25.1420(a)(1), the ice accumulated during descent from the maximum vertical extent of the maximum continuous icing conditions defined in part I of Appendix C to 2,000
feet above the landing surface in the cruise
configuration, plus transition to the approach configuration, plus:
(A) Pre-detection ice, as defined by part II,
paragraph (b)(5), of this Appendix; and
(B) The ice accumulated during the transit
at 2,000 feet above the landing surface of one
cloud with a horizontal extent of 17.4 nautical miles in the most critical of the icing
conditions defined in part I of this Appendix
and one cloud with a horizontal extent of 17.4
nautical miles in the continuous maximum
icing conditions defined in Appendix C of
this part.
(4) Landing ice is the more critical of the
holding ice as defined by part II, paragraph

(b)(2), of this Appendix, or the ice calculated
in the applicable paragraphs (b)(4)(i) or (ii) of
part II of this Appendix:
(i) For an airplane certified in accordance
with Section 25.1420(a)(2), the ice accretion defined
by part II, paragraph (c)(5)(i), of this Appendix, plus a descent from 2,000 feet above the
landing surface to a height of 200 feet above
the landing surface with a transition to the
landing configuration in the icing conditions
defined in part I of this Appendix, plus:
(A) Pre-detection ice, as defined in part II,
paragraph (b)(5), of this Appendix; and
(B) The ice accumulated during an exit
maneuver, beginning with the minimum
climb gradient required by Section 25.119, from a
height of 200 feet above the landing surface
through one cloud with a horizontal extent
of 17.4 nautical miles in the most critical of
the icing conditions defined in part I of this
Appendix and one cloud with a horizontal extent of 17.4 nautical miles in the continuous
maximum icing conditions defined in Appendix C of this part.
(ii) For an airplane certified in accordance
with Section 25.1420(a)(1), the ice accumulated in
the maximum continuous icing conditions
defined in Appendix C of this part, during a
descent from the maximum vertical extent
of the icing conditions defined in Appendix C
of this part, to 2,000 feet above the landing
surface in the cruise configuration, plus
transition to the approach configuration and
flying for 15 minutes at 2,000 feet above the
landing surface, plus a descent from 2,000
feet above the landing surface to a height of
200 feet above the landing surface with a
transition to the landing configuration, plus:
(A) Pre-detection ice, as described by part
II, paragraph (b)(5), of this Appendix; and
(B) The ice accumulated during an exit
maneuver, beginning with the minimum
climb gradient required by Section 25.119, from a
height of 200 feet above the landing surface
through one cloud with a horizontal extent
of 17.4 nautical miles in the most critical of
the icing conditions defined in part I of this
Appendix and one cloud with a horizontal extent of 17.4 nautical miles in the continuous
maximum icing conditions defined in Appendix C of this part.
(5) Pre-detection ice is the ice accretion before detection of flight conditions in this Appendix that require exiting per Section 25.1420(a)(1)
and (2). It is the pre-existing ice accretion
that may exist from operating in icing conditions in which the airplane is approved to operate prior to encountering the icing conditions requiring an exit, plus the ice accumulated during the time needed to detect the
icing conditions, followed by two minutes of
further ice accumulation to take into account the time for the flightcrew to take action to exit the icing conditions, including
coordination with air traffic control.

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