438 

14 CFR Ch. I (1–1–19 Edition) 

§ 135.152 

§§ 23.1459, 25.1459, 27.1459, or 29.1459 of 
this chapter, as appropriate, need be 
established only on one aircraft of a 
group of aircraft: 

(i) That are of the same type; 
(ii) On which the flight recorder mod-

els and their installations are the 
same; and 

(iii) On which there are no dif-

ferences in the type designs with re-
spect to the installation of the first pi-
lot’s instruments associated with the 
flight recorder. The most recent instru-
ment calibration, including the record-
ing medium from which this calibra-
tion is derived, and the recorder cor-
relation must be retained by the cer-
tificate holder. 

(2) For airplanes manufactured after 

August 18, 2000, each flight data re-
corder system required by this section 
must be installed in accordance with 
the requirements of § 23.1459(a) (except 
paragraphs (a)(3)(ii) and (6)), (b), (d) 
and (e), or § 25.1459(a) (except para-
graphs (a)(3)(ii) and (7)), (b), (d) and (e) 
of this chapter. A correlation must be 
established between the values re-
corded by the flight data recorder and 
the corresponding values being meas-
ured. The correlation must contain a 
sufficient number of correlation points 
to accurately establish the conversion 
from the recorded values to engineer-
ing units or discrete state over the full 
operating range of the parameter. Ex-
cept for airplanes having separate alti-
tude and airspeed sensors that are an 
integral part of the flight data recorder 
system, a single correlation may be es-
tablished for any group of airplanes— 

(i) That are of the same type; 
(ii) On which the flight recorder sys-

tem and its installation are the same; 
and 

(iii) On which there is no difference 

in the type design with respect to the 
installation of those sensors associated 
with the flight data recorder system. 
Documentation sufficient to convert 
recorded data into the engineering 
units and discrete values specified in 
the applicable appendix must be main-
tained by the certificate holder. 

(g) Each flight recorder required by 

this section that records the data spec-
ified in paragraphs (a) and (b) of this 
section must have an approved device 

to assist in locating that recorder 
under water. 

(h) The operational parameters re-

quired to be recorded by digital flight 
data recorders required by paragraphs 
(i) and (j) of this section are as follows, 
the phrase ‘‘when an information 
source is installed’’ following a param-
eter indicates that recording of that 
parameter is not intended to require a 
change in installed equipment. 

(1) Time; 
(2) Pressure altitude; 
(3) Indicated airspeed; 
(4) Heading—primary flight crew ref-

erence (if selectable, record discrete, 
true or magnetic); 

(5) Normal acceleration (Vertical); 
(6) Pitch attitude; 
(7) Roll attitude; 
(8) Manual radio transmitter keying, 

or CVR/DFDR synchronization ref-
erence; 

(9) Thrust/power of each engine—pri-

mary flight crew reference; 

(10) Autopilot engagement status; 
(11) Longitudinal acceleration; 
(12) Pitch control input; 
(13) Lateral control input; 
(14) Rudder pedal input; 
(15) Primary pitch control surface po-

sition; 

(16) Primary lateral control surface 

position; 

(17) Primary yaw control surface po-

sition; 

(18) Lateral acceleration; 
(19) Pitch trim surface position or pa-

rameters of paragraph (h)(82) of this 
section if currently recorded; 

(20) Trailing edge flap or cockpit flap 

control selection (except when param-
eters of paragraph (h)(85) of this sec-
tion apply); 

(21) Leading edge flap or cockpit flap 

control selection (except when param-
eters of paragraph (h)(86) of this sec-
tion apply); 

(22) Each Thrust reverser position (or 

equivalent for propeller airplane); 

(23) Ground spoiler position or speed 

brake selection (except when param-
eters of paragraph (h)(87) of this sec-
tion apply); 

(24) Outside or total air temperature; 
(25) Automatic Flight Control Sys-

tem (AFCS) modes and engagement 
status, including autothrottle; 

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