§ 121.319 14 CFR Ch. I (1–1–14 Edition)

than one exit, provided the proximity (i) It must be accessible for use at of the exits allows unassisted verbal enough flight attendant stations so communication between seated flight that all floor-level emergency exits (or attendants; entryways to those exits in the case of (e) Is capable of operation within 10 exits located within galleys) in each seconds by a flight attendant at each of passenger compartment are observable those stations in the passenger com- from one or more of those stations so partment from which its use is acces- equipped; sible; (ii) It must have an alerting system (f) Is audible at all passenger seats, incorporating aural or visual signals lavatories, and flight attendant seats for use by flight crewmembers to alert and work stations; and flight attendants and for use by flight (g) For transport category airplanes attendants to alert flight crew- manufactured on or after November 27, members; 1990, meets the requirements of § 25.1423 (iii) The alerting system required by of this chapter. paragraph (b)(5)(ii) of this section must [Doc. No. 24995, 54 FR 43926, Oct. 27, 1989] have a means for the recipient of a call to determine whether it is a normal § 121.319 Crewmember interphone sys- call or an emergency call; and tem. (iv) When the airplane is on the (a) No person may operate an air- ground, it must provide a means of plane with a seating capacity of more two-way communication between than 19 passengers unless the airplane ground personnel and either of at least is equipped with a crewmember inter- two flight crewmembers in the pilot phone system that: compartment. The interphone system (1) [Reserved] station for use by ground personnel (2) Is capable of operation inde- must be so located that personnel pendent of the public address system using the system may avoid visible de- required by § 121.318(a) except for tection from within the airplane. handsets, headsets, microphones, selec- [Doc. No. 10865, 38 FR 21494, Aug. 9, 1973, as tor switches, and signaling devices; and amended by Amdt. 121–121, 40 FR 42186, Sept. (3) Meets the requirements of para- 11, 1975; Amdt. 121–149, 43 FR 50602, Oct. 30, graph (b) of this section. 1978; Amdt. 121–178, 47 FR 13316, Mar. 29, 1982; (b) The crewmember interphone sys- Amdt. 121–253, 61 FR 2611, Jan. 26, 1996] tem required by paragraph (a) of this section must be approved in accordance § 121.321 Operations in icing. with § 21.305 of this chapter and meet After October 21, 2013, no person may the following requirements: operate an airplane with a certificated (1) It must provide a means of two- maximum weight less than way communication between the pilot 60,000 pounds in conditions conducive compartment and— to icing unless it complies (i) Each passenger compartment; and with this section. As used in this sec- (ii) Each galley located on other than tion, the phrase ‘‘conditions conducive the main passenger deck level. to airframe icing’’ means visible mois- (2) It must be accessible for imme- ture at or below a static air tempera- diate use from each of two flight crew- ture of 5 °C or a total air temperature member stations in the pilot compart- of 10 °C, unless the approved Airplane ment; Flight Manual provides another defini- (3) It must be accessible for use from tion. at least one normal flight attendant (a) When operating in conditions con- station in each passenger compart- ducive to airframe icing, compliance ment; must be shown with paragraph (a)(1), (4) It must be capable of operation or (2), or (3) of this section. within 10 seconds by a flight attendant (1) The airplane must be equipped at those stations in each passenger with a certificated primary airframe compartment from which its use is ac- ice detection system. cessible; and (i) The airframe ice protection sys- (5) For large turbojet-powered air- tem must be activated automatically, planes: or manually by the flightcrew, when

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the primary ice detection system indi- shown with the requirements of para- cates activation is necessary. graph (a)(1) or (2) of this section. (ii) When the airframe ice protection (c) Procedures necessary for safe op- system is activated, any other proce- eration of the airframe ice protection dures in the Airplane Flight Manual system must be established and docu- for operating in icing conditions must mented in: be initiated. (1) The Airplane Flight Manual for (2) Visual cues of the first sign of ice airplanes that comply with paragraph formation anywhere on the airplane (a)(1) or (2) of this section, or and a certificated advisory airframe ice (2) The Airplane Flight Manual or in detection system must be provided. the manual required by § 121.133 for air- (i) The airframe ice protection sys- planes that comply with paragraph tem must be activated when any of the (a)(3) of this section. visual cues are observed or when the (d) Procedures for operation of the advisory airframe ice detection system airframe must indicates activation is necessary, include initial activation, operation whichever occurs first. after initial activation, and deactiva- (ii) When the airframe ice protection tion. Procedures for operation after system is activated, any other proce- initial activation of the ice protection dures in the Airplane Flight Manual system must address— for operating in icing conditions must (1) Continuous operation, be initiated. (2) Automatic cycling, (3) Manual cycling if the airplane is (3) If the airplane is not equipped to equipped with an ice detection system comply with the provisions of para- that alerts the flightcrew each time graph (a)(1) or (2) of this section, then the ice protection system must be cy- the following apply: cled, or (i) When operating in conditions con- (4) Manual cycling based on a time ducive to airframe icing, the airframe interval if the airplane type is not ice protection system must be acti- equipped with features necessary to vated prior to, and operated during, the implement (d)(1)–(3) of this section. following phases of flight: (e) System installations used to com- (A) Takeoff climb after second seg- ply with paragraph (a)(1) or (a)(2) of ment, this section must be approved through (B) En route climb, an amended or supplemental type cer- (C) Go-around climb, tificate in accordance with part 21 of (D) Holding, this chapter. (E) Maneuvering for approach and [Doc. No. FAA–2009–0675, 78 FR 15876, Mar. 13, , and 2013] (F) Any other operation at approach or holding airspeeds. § 121.323 Instruments and equipment (ii) During any other phase of flight, for operations at night. the airframe ice protection system No person may operate an airplane at must be activated and operated at the night under this part unless it is first sign of ice formation anywhere on equipped with the following instru- the airplane, unless the Airplane ments and equipment in addition to Flight Manual specifies that the air- those required by §§ 121.305 through frame ice protection system should not 121.321 and 121.803: be used or provides other operational (a) Position lights. instructions. (b) An anti-collision light. (iii) Any additional procedures for (c) Two landing lights, except that operation in conditions conducive to only one landing light is required for icing specified in the Airplane Flight nontransport category airplanes type Manual or in the manual required by certificated after December 31, 1964. § 121.133 must be initiated. (d) Instrument lights providing (b) If the procedures specified in enough light to make each required in- paragraph (a)(3)(i) of this section are strument, switch, or similar instru- specifically prohibited in the Airplane ment, easily readable and installed so Flight Manual, compliance must be that the direct rays are shielded from

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