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149 

Federal Aviation Administration, DOT 

§ 121.349 

(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 pro-

cedure and the test results submitted 
by the certificate holder as its compli-
ance with paragraph (c)(2) of this sec-
tion are repeatable; and 

(ii) The certificate holder maintains 

documentation of the procedure re-
quired to reconstruct the original sen-
sor signal value. This documentation is 
also subject to the requirements of 
§ 121.344(i). 

(d) 

Compliance. 

Compliance is re-

quired as follows: 

(1) No later than October 20, 2011, 

each operator must determine, for each 
airplane on its operations specifica-
tions, whether the airplane’s DFDR 
system is filtering any of the param-
eters listed in paragraph (c) of this sec-
tion. The operator must create a record 
of this determination for each airplane 
it operates, and maintain it as part of 
the correlation documentation re-
quired by § 121.344(j)(3) of this part. 

(2) For airplanes that are not fil-

tering any listed parameter, no further 
action is required unless the airplane’s 
DFDR system is modified in a manner 
that would cause it to meet the defini-
tion of filtering on any listed param-
eter. 

(3) For airplanes found to be filtering 

a parameter listed in paragraph (c) of 
this section, the operator must either: 

(i) No later than April 21, 2014, re-

move the filtering; or 

(ii) No later than April 22, 2013, sub-

mit the necessary procedure and test 
results required by paragraph (c)(2) of 
this section. 

(4) After April 21, 2014, no aircraft 

flight data recording system may filter 
any parameter listed in paragraph (c) 
of this section that does not meet the 
requirements of Appendix B or M of 
this part, unless the certificate holder 
possesses test and analysis procedures 
and the test results that have been ap-
proved by the FAA. All records of 
tests, analysis and procedures used to 
comply with this section must be 
maintained as part of the correlation 

documentation required by 
§ 121.344(j)(3) of this part. 

[Doc. No. FAA–2006–26135, 75 FR 7356, Feb. 19, 
2010] 

§ 121.347 Communication and naviga-

tion equipment for operations 
under VFR over routes navigated 

by pilotage. 

(a) No person may operate an air-

plane under VFR over routes that can 
be navigated by pilotage unless the air-
plane is equipped with the radio com-
munication equipment necessary under 
normal operating conditions to fulfill 
the following: 

(1) Communicate with at least one 

appropriate station from any point on 
the route; 

(2) Communicate with appropriate air 

traffic control facilities from any point 
within Class B, Class C, or Class D air-
space, or within a Class E surface area 
designated for an airport in which 
flights are intended; and 

(3) Receive meteorological informa-

tion from any point en route by either 
of two independent systems. One of the 
means provided to comply with this 
subparagraph may be used to comply 
with paragraphs (a)(1) and (2) of this 
section. 

(b) No person may operate an air-

plane at night under VFR over routes 
that can be navigated by pilotage un-
less that airplane is equipped with— 

(1) Radio communication equipment 

necessary under normal operating con-
ditions to fulfill the functions specified 
in paragraph (a) of this section; and 

(2) Navigation equipment suitable for 

the route to be flown. 

[Doc. No. 6258, 29 FR 19205, Dec. 31, 1964, as 
amended by Amdt. 121–226, 56 FR 65663, Dec. 
17, 1991; Amdt. 121–333, 72 FR 31681, June 7, 
2007] 

§ 121.349 Communication and naviga-

tion equipment for operations 

under VFR over routes not navi-

gated by pilotage or for operations 

under IFR or over the top. 

(a) 

Navigation equipment require-

ments—General. 

No person may conduct 

operations under VFR over routes that 
cannot be navigated by pilotage, or op-
erations conducted under IFR or over 
the top, unless—