[Code of Federal Regulations]
[Title 14, Volume 2]
[Revised as of January 1, 2008]
From the U.S. Government Printing Office via GPO Access
[CITE: 14CFR135.150]

[Page 1088-1089]
 
                     TITLE 14--AERONAUTICS AND SPACE
 
CHAPTER I--FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION 
                               (CONTINUED)
 
PART 135_OPERATING REQUIREMENTS: COMMUTER AND ON DEMAND OPERATIONS AND RULES 
 
                    Subpart C_Aircraft and Equipment
 
Sec. 135.150  Public address and crewmember interphone systems.

    No person may operate an aircraft having a passenger seating 
configuration, excluding any pilot seat, of more than 19 unless it is 
equipped with--
    (a) A public address system which--
    (1) Is capable of operation independent of the crewmember interphone 
system required by paragraph (b) of this section, except for handsets, 
headsets, microphones, selector switches, and signaling devices;
    (2) Is approved in accordance with Sec. 21.305 of this chapter;
    (3) Is accessible for immediate use from each of two flight 
crewmember stations in the pilot compartment;
    (4) For each required floor-level passenger emergency exit which has 
an adjacent flight attendant seat, has a microphone which is readily 
accessible to the seated flight attendant, except that one microphone 
may serve more than one exit, provided the proximity of the exits allows 
unassisted verbal communication between seated flight attendants;
    (5) Is capable of operation within 10 seconds by a flight attendant 
at each of those stations in the passenger compartment from which its 
use is accessible;
    (6) Is audible at all passenger seats, lavatories, and flight 
attendant seats and work stations; and
    (7) For transport category airplanes manufactured on or after 
November 27, 1990, meets the requirements of Sec. 25.1423 of this 
chapter.
    (b) A crewmember interphone system which--
    (1) Is capable of operation independent of the public address system 
required by paragraph (a) of this section, except for handsets, 
headsets, microphones, selector switches, and signaling devices;

[[Page 1089]]

    (2) Is approved in accordance with Sec. 21.305 of this chapter;
    (3) Provides a means of two-way communication between the pilot 
compartment and--
    (i) Each passenger compartment; and
    (ii) Each galley located on other than the main passenger deck 
level;
    (4) Is accessible for immediate use from each of two flight 
crewmember stations in the pilot compartment;
    (5) Is accessible for use from at least one normal flight attendant 
station in each passenger compartment;
    (6) Is capable of operation within 10 seconds by a flight attendant 
at each of those stations in each passenger compartment from which its 
use is accessible; and
    (7) For large turbojet-powered airplanes--
    (i) Is accessible for use at enough flight attendant stations so 
that all floor-level emergency exits (or entryways to those exits in the 
case of exits located within galleys) in each passenger compartment are 
observable from one or more of those stations so equipped;
    (ii) Has an alerting system incorporating aural or visual signals 
for use by flight crewmembers to alert flight attendants and for use by 
flight attendants to alert flight crewmembers;
    (iii) For the alerting system required by paragraph (b)(7)(ii) of 
this section, has a means for the recipient of a call to determine 
whether it is a normal call or an emergency call; and
    (iv) When the airplane is on the ground, provides a means of two-way 
communication between ground personnel and either of at least two flight 
crewmembers in the pilot compartment. The interphone system station for 
use by ground personnel must be so located that personnel using the 
system may avoid visible detection from within the airplane.

[Doc. No. 24995, 54 FR 43926, Oct. 27, 1989]