846 

14 CFR Ch. I (1–1–24 Edition) 

§ 39.27 

§ 39.27

What do I do if the airworthi-

ness directive conflicts with the 
service document on which it is 
based? 

In some cases an airworthiness direc-

tive incorporates by reference a manu-
facturer’s service document. In these 
cases, the service document becomes 
part of the airworthiness directive. In 
some cases the directions in the service 
document may be modified by the air-
worthiness directive. If there is a con-
flict between the service document and 
the airworthiness directive, you must 
follow the requirements of the air-
worthiness directive. 

PART 43—MAINTENANCE, PREVEN-

TIVE MAINTENANCE, REBUILD-
ING, AND ALTERATION 

Sec. 
43.1

Applicability. 

43.2

Records of overhaul and rebuilding. 

43.3

Persons authorized to perform mainte-

nance, preventive maintenance, rebuild-
ing, and alterations. 

43.5

Approval for return to service after 

maintenance, preventive maintenance, 
rebuilding, or alteration. 

43.7

Persons authorized to approve aircraft, 

airframes, aircraft engines, propellers, 
appliances, or component parts for re-
turn to service after maintenance, pre-
ventive maintenance, rebuilding, or al-
teration. 

43.9

Content, form, and disposition of main-

tenance, preventive maintenance, re-
building, and alteration records (except 
inspections performed in accordance 
with part 91, part 123, part 125, 
§ 135.411(a)(1), and § 135.419 of this chap-
ter). 

43.10

Disposition of life-limited aircraft 

parts. 

43.11

Content, form, and disposition of 

records for inspections conducted under 
parts 91 and 125 and §§ 135.411(a)(1) and 
135.419 of this chapter. 

43.12

Maintenance records: Falsification, re-

production, or alteration. 

43.13

Performance rules (general). 

43.15

Additional performance rules for in-

spections. 

43.16

Airworthiness Limitations. 

43.17

Maintenance, preventive maintenance, 

and alterations performed on U.S. aero-
nautical products by certain Canadian 
persons. 

A

PPENDIX

A 

TO

P

ART

43—M

AJOR

A

LTER

-

ATIONS

, M

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R

EPAIRS

, 

AND

P

REVENTIVE

 

M

AINTENANCE

 

A

PPENDIX

B 

TO

P

ART

43—R

ECORDING

OF

 

M

AJOR

R

EPAIRS AND

M

AJOR

A

LTERATIONS

 

A

PPENDIX

C 

TO

P

ART

43 [R

ESERVED

] 

A

PPENDIX

D 

TO

P

ART

43—S

COPE AND

D

ETAIL

 

OF

I

TEMS

(

AS

A

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IRCRAFT

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A

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OUR

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A

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43—A

LTIMETER

S

YSTEM

 

T

EST AND

I

NSPECTION

 

A

PPENDIX

F 

TO

P

ART

43—ATC T

RANSPONDER

 

T

ESTS AND

I

NSPECTIONS

 

A

UTHORITY

: 42 U.S.C. 7572; 49 U.S.C. 106(f), 

106(g), 40105, 40113, 44701–44702, 44704, 44707, 
44709, 44711, 44713, 44715, 45303. 

S

OURCE

: Docket No. 1993, 29 FR 5451, Apr. 

23, 1964, unless otherwise noted. 

E

DITORIAL

N

OTE

: For miscellaneous tech-

nical amendments to this part 43, see Amdt. 
43–3, 31 FR 3336, Mar. 3, 1966, and Amdt. 43– 
6, 31 FR 9211, July 6, 1966. 

§ 43.1

Applicability. 

(a) Except as provided in paragraphs 

(b) and (d) of this section, this part pre-
scribes rules governing the mainte-
nance, preventive maintenance, re-
building, and alteration of any— 

(1) Aircraft having a U.S. airworthi-

ness certificate; 

(2) Foreign-registered civil aircraft 

used in common carriage or carriage of 
mail under the provisions of Part 121 or 
135 of this chapter; and 

(3) Airframe, aircraft engines, propel-

lers, appliances, and component parts 
of such aircraft. 

(b) This part does not apply to— 
(1) Any aircraft for which the FAA 

has issued an experimental certificate, 
unless the FAA has previously issued a 
different kind of airworthiness certifi-
cate for that aircraft; 

(2) Any aircraft for which the FAA 

has issued an experimental certificate 
under the provisions of § 21.191(i)(3) of 
this chapter, and the aircraft was pre-
viously issued a special airworthiness 
certificate in the light-sport category 
under the provisions of § 21.190 of this 
chapter; or 

(3) Any aircraft that is operated 

under part 107 of this chapter, except 
as described in § 107.140(d). 

(c) This part applies to all life-lim-

ited parts that are removed from a 
type certificated product, segregated, 
or controlled as provided in § 43.10. 

(d) This part applies to any aircraft 

issued a special airworthiness certifi-
cate in the light-sport category except: 

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§ 43.3 

(1) The repair or alteration form 

specified in §§ 43.5(b) and 43.9(d) is not 
required to be completed for products 
not produced under an FAA approval; 

(2) Major repairs and major alter-

ations for products not produced under 
an FAA approval are not required to be 
recorded in accordance with appendix B 
of this part; and 

(3) The listing of major alterations 

and major repairs specified in para-
graphs (a) and (b) of appendix A of this 
part is not applicable to products not 
produced under an FAA approval. 

[Doc. No. 1993, 29 FR 5451, Apr. 23, 1964, as 
amended by Amdt. 43–23, 47 FR 41084, Sept. 
16, 1982; Amdt. 43–37, 66 FR 21066, Apr. 27, 
2001; Amdt. 43–38, 67 FR 2109, Jan. 15, 2002; 
Amdt. 43–39, 69 FR 44863, July 27, 2004; Amdt. 
43–44, 75 FR 5219, Feb. 1, 2010; Docket FAA– 
2015–0150, Amdt. 43–48, 81 FR 42208, June 28, 
2016; Docket FAA–2018–1087, Amdt. 43–51, 86 
FR 4381, Jan. 15, 2021] 

§ 43.2

Records of overhaul and rebuild-

ing. 

(a) No person may describe in any re-

quired maintenance entry or form an 
aircraft, airframe, aircraft engine, pro-
peller, appliance, or component part as 
being overhauled unless— 

(1) Using methods, techniques, and 

practices acceptable to the Adminis-
trator, it has been disassembled, 
cleaned, inspected, repaired as nec-
essary, and reassembled; and 

(2) It has been tested in accordance 

with approved standards and technical 
data, or in accordance with current 
standards and technical data accept-
able to the Administrator, which have 
been developed and documented by the 
holder of the type certificate, supple-
mental type certificate, or a material, 
part, process, or appliance approval 
under part 21 of this chapter. 

(b) No person may describe in any re-

quired maintenance entry or form an 
aircraft, airframe, aircraft engine, pro-
peller, appliance, or component part as 
being rebuilt unless it has been dis-
assembled, cleaned, inspected, repaired 
as necessary, reassembled, and tested 
to the same tolerances and limits as a 
new item, using either new parts or 
used parts that either conform to new 
part tolerances and limits or to ap-

proved oversized or undersized dimen-
sions. 

[Amdt. 43–23, 47 FR 41084, Sept. 16, 1982, as 
amended by Amdt. 43–43, 74 FR 53394, Oct. 16, 
2009] 

§ 43.3

Persons authorized to perform 

maintenance, preventive mainte-
nance, rebuilding, and alterations. 

(a) Except as provided in this section 

and § 43.17, no person may maintain, re-
build, alter, or perform preventive 
maintenance on an aircraft, airframe, 
aircraft engine, propeller, appliance, or 
component part to which this part ap-
plies. Those items, the performance of 
which is a major alteration, a major re-
pair, or preventive maintenance, are 
listed in appendix A. 

(b) The holder of a mechanic certifi-

cate may perform maintenance, pre-
ventive maintenance, and alterations 
as provided in Part 65 of this chapter. 

(c) The holder of a repairman certifi-

cate may perform maintenance, pre-
ventive maintenance, and alterations 
as provided in part 65 of this chapter. 

(d) A person working under the su-

pervision of a holder of a mechanic or 
repairman certificate may perform the 
maintenance, preventive maintenance, 
and alterations that his supervisor is 
authorized to perform, if the supervisor 
personally observes the work being 
done to the extent necessary to ensure 
that it is being done properly and if the 
supervisor is readily available, in per-
son, for consultation. However, this 
paragraph does not authorize the per-
formance of any inspection required by 
Part 91 or Part 125 of this chapter or 
any inspection performed after a major 
repair or alteration. 

(e) The holder of a repair station cer-

tificate may perform maintenance, pre-
ventive maintenance, and alterations 
as provided in Part 145 of this chapter. 

(f) The holder of an air carrier oper-

ating certificate or an operating cer-
tificate issued under Part 121 or 135, 
may perform maintenance, preventive 
maintenance, and alterations as pro-
vided in Part 121 or 135. 

(g) Except for holders of a sport pilot 

certificate, the holder of a pilot certifi-
cate issued under part 61 may perform 
preventive maintenance on any air-
craft owned or operated by that pilot 
which is not used under part 121, 129, or 

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