Federal Aviation Administration, DOT

Section 135.151

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]

Section 135.151 Cockpit voice recorders.
(a) No person may operate a multiengine, turbine-powered airplane or
rotorcraft having a passenger seating
configuration of six or more and for
which two pilots are required by certification or operating rules unless it is
equipped with an approved cockpit
voice recorder that:
(1) Is installed in compliance with
Section 23.1457(a)(1) and (2), (b), (c), (d)(1)(i),
(2) and (3), (e), (f), and (g); Section 25.1457(a)(1)
and (2), (b), (c), (d)(1)(i), (2) and (3), (e),
(f), and (g), Section 27.1457(a)(1) and (2), (b),
(c), (d)(1)(i), (2) and (3), (e), (f), and (g);
or Section 29.1457(a)(1) and (2), (b), (c), (d)(1)(i),
(2) and (3), (e), (f), and (g) of this chapter, as applicable; and
(2) Is operated continuously from the
use of the check list before the flight
to completion of the final check list at
the end of the flight.
(b) No person may operate a multiengine, turbine-powered airplane or
rotorcraft having a passenger seating
configuration of 20 or more seats unless
it is equipped with an approved cockpit
voice recorder that - 
(1) Is installed in accordance with the
requirements of Section 23.1457 (except paragraphs (a)(6), (d)(1)(ii), (4), and (5));
Section 25.1457 (except paragraphs (a)(6),
(d)(1)(ii), (4), and (5)); Section 27.1457 (except
paragraphs (a)(6), (d)(1)(ii), (4), and (5));

or Section 29.1457 (except paragraphs (a)(6),
(d)(1)(ii), (4), and (5)) of this chapter, as
applicable; and
(2) Is operated continuously from the
use of the check list before the flight
to completion of the final check list at
the end of the flight.
(c) In the event of an accident, or occurrence requiring immediate notification of the National Transportation
Safety Board which results in termination of the flight, the certificate
holder shall keep the recorded information for at least 60 days or, if requested
by the Administrator or the Board, for
a longer period. Information obtained
from the record may be used to assist
in determining the cause of accidents
or occurrences in connection with investigations. The Administrator does
not use the record in any civil penalty
or certificate action.
(d) For those aircraft equipped to
record the uninterrupted audio signals
received by a boom or a mask microphone the flight crewmembers are required to use the boom microphone
below 18,000 feet mean sea level. No
person may operate a large turbine engine powered airplane manufactured
after October 11, 1991, or on which a
cockpit voice recorder has been installed after October 11, 1991, unless it
is equipped to record the uninterrupted
audio signal received by a boom or
mask microphone in accordance with
Section 25.1457(c)(5) of this chapter.
(e) In complying with this section, an
approved cockpit voice recorder having
an erasure feature may be used, so that
during the operation of the recorder,
information:
(1) Recorded in accordance with paragraph (a) of this section and recorded
more than 15 minutes earlier; or
(2) Recorded in accordance with paragraph (b) of this section and recorded
more than 30 minutes earlier; may be
erased or otherwise obliterated.
(f) By April 7, 2012, all airplanes subject to paragraph (a) or paragraph (b)
of this section that are manufactured
before April 7, 2010, and that are required to have a flight data recorder
installed in accordance with Section 135.152,
must have a cockpit voice recorder
that also - 

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