Section 121.345

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

with this section, but must continue to
comply with applicable paragraphs of
Section 135.152 of this chapter, as appropriate:
Beech Aircraft-99 Series, Beech Aircraft 1300, Beech Aircraft 1900C,
Construcciones
Aeronauticas,
S.A.
(CASA) C-212, deHavilland DHC-6,
Dornier 228, HS-748, Embraer EMB 110,
Jetstream 3101, Jetstream 3201, Fairchild Aircraft SA-226, Fairchild Metro
SA-227.
(g) All airplanes subject to the requirements of this section that are
manufactured on or after April 7, 2010,
must have a digital flight data recorder
installed that also - 
(1) Meets the requirements in
Section 23.1459(a)(3), (a)(6), and (a)(7) or
Section 25.1459(a)(3), (a)(7), and (a)(8) of this
chapter, as applicable; and
(2) Retains the 25 hours of recorded
information required in Section 121.344(g)
using a recorder that meets the standards of TSO-C124a, or later revision.
[Doc. No. 28109, 62 FR 38380, July 17, 1997; 62
FR 48135, Sept. 12, 1997; 62 FR 65202, Dec. 11,
1997, as amended by Amdt. 121-300, 68 FR
42936, July 18, 2003; Amdt. 121-338, 73 FR
12566, Mar. 7, 2008; Amdt. 121-338, 74 FR 32801,
July 9, 2009; Amdt. 121-347, 75 FR 7356, Feb.
19, 2010]

Section 121.345

Radio equipment.

(a) No person may operate an airplane unless it is equipped with radio
equipment required for the kind of operation being conducted.
(b) Where two independent (separate
and complete) radio systems are required by SectionSection 121.347 and 121.349, each
system must have an independent antenna installation except that, where
rigidly supported nonwire antennas or
other antenna installations of equivalent reliability are used, only one antenna is required.
(c) ATC transponder equipment installed within the time periods indicated below must meet the performance and environmental requirements
of the following TSO-s:
(1) Through January 1, 1992: (i) Any
class of TSO-C74b or any class of TSOC74c as appropriate, provided that the
equipment was manufactured before
January 1, 1990; or
(ii) The appropriate class of TSO-C112
(Mode S).

(2) After January 1, 1992: The appropriate class of TSO-C112 (Mode S). For
purposes of paragraph (c) (2) of this section,  - installation -  does not include - 
(i) Temporary installation of TSOC74b or TSO-C74c substitute equipment, as appropriate, during maintenance of the permanent equipment;
(ii) Reinstallation of equipment after
temporary removal for maintenance; or
(iii) For fleet operations, installation
of equipment in a fleet aircraft after
removal of the equipment for maintenance from another aircraft in the
same operator-s fleet.
[Doc. No. 6258, 29 FR 19205, Dec. 31, 1964, as
amended by Amdt. 121-101, 37 FR 28499, Dec.
27, 1972; Amdt. 121-190, 52 FR 3391, Feb. 3,
1987]

Section 121.346 Flight data recorders: filtered data.
(a) A flight data signal is filtered
when an original sensor signal has been
changed in any way, other than
changes necessary to:
(1) Accomplish analog to digital conversion of the signal;
(2) Format a digital signal to be
DFDR compatible; or
(3) Eliminate a high frequency component of a signal that is outside the
operational bandwidth of the sensor.
(b) An original sensor signal for any
flight recorder parameter required to
be recorded under Section 121.344 may be filtered only if the recorded signal value
continues to meet the requirements of
Appendix B or M of this part, as applicable.
(c) For a parameter described in
Section 121.344(a) (12) through (17), (42), or (88),
or the corresponding parameter in Appendix B of this part, if the recorded
signal value is filtered and does not
meet the requirements of Appendix B
or M of this part, as applicable, the certificate holder must:
(1) Remove the filtering and ensure
that the recorded signal value meets
the requirements of Appendix B or M of
this part, as applicable; or
(2) Demonstrate by test and analysis
that the original sensor signal value
can be reconstructed from the recorded
data. This demonstration requires
that:
(i) The FAA determine that the procedure and the test results submitted

136

VerDate Sep<11>2014

08:20 May 17, 2019

Jkt 247048

PO 00000

Frm 00146

Fmt 8010

Sfmt 8010

Y:\SGML\247048.XXX

247048