135 

Federal Aviation Administration, DOT 

§ 121.344a 

the requirements in this section or the 
applicable paragraphs in § 135.152 of this 
chapter. In addition, by August 20, 2001. 

(1) The parameters listed in 

§§ 121.344(a)(1) through 121.344(a)(18) of 
this part must be recorded with the 
ranges, accuracies, and resolutions 
specified in Appendix B of part 135 of 
this chapter, except that— 

(i) Either the parameter listed in 

§ 121.344 (a)(12) or (a)(15) of this part 
must be recorded; either the param-
eters listed in § 121.344(a)(13) or (a)(16) 
of this part must be recorded; and ei-
ther the parameter listed in 
§ 121.344(a)(14) or (a)(17) of this part 
must be recorded. 

(ii) For airplanes with more than two 

engines, the parameter described in 
§ 121.344(a)(18) of this part must also be 
recorded if sufficient capacity is avail-
able on the existing recorder to record 
that parameter; 

(iii) Parameters listed in 

§§ 121.344(a)(12) through 121.344(a)(17) of 
this part each may be recorded from a 
single source; 

(iv) Any parameter for which no 

value is contained in Appendix B of 
part 135 of this chapter must be re-
corded within the ranges, accuracies, 
and resolutions specified in Appendix 
M of this part. 

(2) Commensurate with the capacity 

of the recording system (FDAU or 
equivalent and the DFDR), the param-
eters listed in §§ 121.344(a)(19) through 
121.344(a)(22) of this part also must be 
recorded within the ranges, accuracies, 
resolutions, and recording intervals 
specified in Appendix B of part 135 of 
this chapter. 

(3) The approved flight recorder re-

quired by this section must be installed 
as soon as practicable, but no later 
than the next heavy maintenance 
check or equivalent after August 18, 
1999. A heavy maintenance check is 
considered to be any time an airplane 
is scheduled to be out of service for 4 
more days and is scheduled to include 
access to major structural components. 

(b) For a turbine-engine-powered air-

planes having a passenger seating con-
figuration, excluding any required 
crewmember seat, of 10 to 19 seats, that 
are manufactured after August 18, 2000. 

(1) The parameters listed in 

§§ 121.344(a)(1) through 121.344(a)(57) of 

this part, must be recorded within the 
ranges, accuracies, resolutions, and re-
cording intervals specified in Appendix 
M of this part. 

(2) Commensurate with the capacity 

of the recording system, all additional 
parameters listed in § 121.344(a) of this 
part for which information sources are 
installed and which are connected to 
the recording system, must be recorded 
within the ranges, accuracies, resolu-
tions, and sampling intervals specified 
in Appendix M of this part by August 
20, 2001. 

(c) For all turbine-engine-powered 

airplanes having a passenger seating 
configuration, excluding any required 
crewmember seats, of 10 to 19 seats, 
that are manufactured after August 19, 
2002, the parameters listed in 
§ 121.344(a)(1) through (a)(88) of this 
part must be recorded within the 
ranges, accuracies, resolutions, and re-
cording intervals specified in Appendix 
M of this part. 

(d) Each flight data recorder system 

required by this section must be in-
stalled in accordance with the require-
ments of § 23.1459(a) (except paragraphs 
(a)(3)(ii) and (6)), (b), (d) and (e) of this 
chapter. A correlation must be estab-
lished between the values recorded by 
the flight data recorder and the cor-
responding values being measured. The 
correlation must contain a sufficient 
number of correlation points to accu-
rately establish the conversion from 
the recorded values to engineering 
units or discrete state over the full op-
erating range of the parameter. A sin-
gle correlation may be established for 
any group of airplanes— 

(1) That are of the same type; 
(2) On which the flight recorder sys-

tem and its installation are the same; 
and 

(3) On which there is no difference in 

the type design with respect to the in-
stallation of those sensors associated 
with the flight data recorder system. 
Correlation documentation must be 
maintained by the certificate holder. 

(e) All airplanes subject to this sec-

tion are also subject to the require-
ments and exceptions stated in 
§ 121.344(g) through (k) and § 121.346. 

(f) For airplanes that were manufac-

tured before August 18, 1997, the fol-
lowing airplane types need not comply 

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