Federal Aviation Administration, DOT § 25.1419

event of a loss of one raft of the largest (c) Caution information, such as an rated capacity; and amber caution light or equivalent, (2) Each raft must have a trailing must be provided to alert the line, and must have a static line de- flightcrew when the anti-ice or de-ice signed to hold the raft near the air- system is not functioning normally. plane but to release it if the airplane (d) For turbine engine powered air- becomes totally submerged. planes, the ice protection provisions of (c) Approved survival equipment this section are considered to be appli- must be attached to each liferaft. cable primarily to the . For (d) There must be an approved sur- the powerplant installation, certain ad- vival type emergency locator trans- ditional provisions of subpart E of this mitter for use in one life raft. (e) For airplanes not certificated for part may be found applicable. (e) One ditching under § 25.801 and not having of the following methods of icing detec- approved life preservers, there must be tion and activation of the airframe ice an approved flotation means for each protection system must be provided: occupant. This means must be within (1) A primary ice detection system easy reach of each seated occupant and that automatically activates or alerts must be readily removable from the the flightcrew to activate the airframe airplane. ; (2) A definition of visual cues for rec- [Doc. No. 5066, 29 FR 18291, Dec. 24, 1964, as amended by Amdt. 25–29, 36 FR 18722, Sept. ognition of the first sign of ice accre- 21, 1971; Amdt 25–50, 45 FR 38348, June 9, 1980; tion on a specified surface combined Amdt. 25–72, 55 FR 29785, July 20, 1990; Amdt. with an advisory ice detection system 25–82, 59 FR 32057, June 21, 1994] that alerts the flightcrew to activate the airframe ice protection system; or § 25.1419 Ice protection. (3) Identification of conditions con- If the applicant seeks certification ducive to airframe icing as defined by for flight in , the air- an appropriate static or total air tem- plane must be able to safely operate in perature and visible moisture for use the continuous maximum and inter- by the flightcrew to activate the air- mittent maximum icing conditions of frame ice protection system. appendix C. To establish this— (a) An analysis must be performed to (f) Unless the applicant shows that establish that the ice protection for the airframe ice protection system the various components of the airplane need not be operated during specific is adequate, taking into account the phases of flight, the requirements of various airplane operational configura- paragraph (e) of this section are appli- tions; and cable to all phases of flight. (b) To verify the ice protection anal- (g) After the initial activation of the ysis, to check for icing anomalies, and airframe ice protection system— to demonstrate that the ice protection (1) The ice protection system must be system and its components are effec- designed to operate continuously; tive, the airplane or its components (2) The airplane must be equipped must be flight tested in the various with a system that automatically cy- operational configurations, in meas- cles the ice protection system; or ured natural atmospheric icing condi- (3) An ice detection system must be tions and, as found necessary, by one provided to alert the flightcrew each or more of the following means: time the ice protection system must be (1) Laboratory dry air or simulated cycled. icing tests, or a combination of both, of (h) Procedures for operation of the the components or models of the com- ice protection system, including acti- ponents. vation and deactivation, must be estab- (2) Flight dry air tests of the ice pro- tection system as a whole, or of its in- lished and documented in the Airplane dividual components. Flight Manual. (3) Flight tests of the airplane or its [Amdt. 25–72, 55 FR 29785, July 20, 1990, as components in measured simulated amended by Amdt. 25–121, 72 FR 44669, Aug. 8, icing conditions. 2007; Amdt. 25–129, 74 FR 38339, Aug. 3, 2009]

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