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Federal Aviation Administration, DOT 

§ 121.359 

and that part of Canada west of lon-
gitude 130 degrees W, between latitude 
70 degrees N, and latitude 53 degrees N, 
or during any training, test, or ferry 

(e) Notwithstanding any other provi-

sion of this chapter, an alternate elec-
trical power supply is not required for 
airborne weather radar equipment. 

[Doc. No. 6258, 29 FR 19205, Dec. 31, 1964, as 
amended by Amdt. 121–18, 31 FR 5825, Apr. 15, 
1966; Amdt. 121–130, 41 FR 47229, Oct. 28, 1976; 
Amdt. 121–251, 60 FR 65932, Dec. 20, 1995] 

§ 121.358

Low-altitude windshear sys-

tem equipment requirements. 


Airplanes manufactured after Janu-

ary 2, 1991. 

No person may operate a 

turbine-powered airplane manufac-
tured after January 2, 1991, unless it is 
equipped with either an approved air-
borne windshear warning and flight 
guidance system, an approved airborne 
detection and avoidance system, or an 
approved combination of these sys-


Airplanes manufactured before Jan-

uary 3, 1991. 

Except as provided in para-

graph (c) of this section, after January 
2, 1991, no person may operate a tur-
bine-powered airplane manufactured 
before January 3, 1991 unless it meets 
one of the following requirements as 

(1) The makes/models/series listed 

below must be equipped with either an 
approved airborne windshear warning 
and flight guidance system, an ap-
proved airborne detection and avoid-
ance system, or an approved combina-
tion of these systems: 

(i) A–300–600; 
(ii) A–310—all series; 
(iii) A–320—all series; 
(iv) B–737–300, 400, and 500 series; 
(v) B–747–400; 
(vi) B–757—all series; 
(vii) B–767—all series; 
(viii) F–100—all series; 
(ix) MD–11—all series; and 
(x) MD–80 series equipped with an 

EFIS and Honeywell-970 digital flight 
guidance computer. 

(2) All other turbine-powered air-

planes not listed above must be 
equipped with as a minimum require-
ment, an approved airborne windshear 
warning system. These airplanes may 
be equipped with an approved airborne 

windshear detection and avoidance sys-
tem, or an approved combination of 
these systems. 


Extension of the compliance date. 

certificate holder may obtain an exten-
sion of the compliance date in para-
graph (b) of this section if it obtains 
FAA approval of a retrofit schedule. To 
obtain approval of a retrofit schedule 
and show continued compliance with 
that schedule, a certificate holder must 
do the following: 

(1) Submit a request for approval of a 

retrofit schedule by June 1, 1990, to the 
appropriate Flight Standards division 
manager in the responsible Flight 
Standards office. 

(2) Show that all of the certificate 

holder’s airplanes required to be 
equipped in accordance with this sec-
tion will be equipped by the final com-
pliance date established for TCAS II 

(3) Comply with its retrofit schedule 

and submit status reports containing 
information acceptable to the Adminis-
trator. The initial report must be sub-
mitted by January 2, 1991, and subse-
quent reports must be submitted every 
six months thereafter until completion 
of the schedule. The reports must be 
submitted to the certificate holder’s 
assigned Principal Avionics Inspector. 



For the purposes of 

this section the following definitions 


Turbine-powered airplane 


e.g., turbofan-, turbojet-, propfan-, and 
ultra-high bypass fan-powered air-
planes. The definition specifically ex-
cludes turbopropeller-powered air-

(2) An airplane is considered manu-

factured on the date the inspection ac-
ceptance records reflect that the air-
plane is complete and meets the FAA 
Approved Type Design data. 

[Doc. No. 25954, 55 FR 13242, Apr. 9, 1990, as 
amended by Docket FAA–2018–0119, Amdt. 
121–380, 83 FR 9173, Mar. 5, 2018] 

§ 121.359

Cockpit voice recorders. 

(a) No certificate holder may operate 

a large turbine engine powered airplane 
or a large pressurized airplane with 
four reciprocating engines unless an 
approved cockpit voice recorder is in-
stalled in that airplane and is operated 
continuously from the start of the use 

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