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193 

Federal Aviation Administration, DOT 

Pt. 23, App. A 

by the FAA in a manner specified by 
the administrator— 

(1) For low-speed, level 1 and 2 air-

planes, those portions of the Airplane 
Flight Manual containing the informa-
tion specified in paragraph (a)(1) of this 
section; and 

(2) For high-speed level 1 and 2 air-

planes and all level 3 and 4 airplanes, 
those portions of the Airplane Flight 
Manual containing the information 
specified in paragraphs (a)(1) thru (a)(4) 
of this section. 

A

PPENDIX

TO

P

ART

23—I

NSTRUCTIONS

 

FOR

C

ONTINUED

A

IRWORTHINESS

 

A23.1

General 

(a) This appendix specifies requirements 

for the preparation of Instructions for Con-
tinued Airworthiness as required by this 
part. 

(b) The Instructions for Continued Air-

worthiness for each airplane must include 
the Instructions for Continued Airworthiness 
for each engine and propeller (hereinafter 
designated ‘‘products’’), for each appliance 
required by this chapter, and any required 
information relating to the interface of 
those appliances and products with the air-
plane. If Instructions for Continued Air-
worthiness are not supplied by the manufac-
turer of an appliance or product installed in 
the airplane, the Instructions for Continued 
Airworthiness for the airplane must include 
the information essential to the continued 
airworthiness of the airplane. 

(c) The applicant must submit to the FAA 

a program to show how changes to the In-
structions for Continued Airworthiness made 
by the applicant or by the manufacturers of 
products and appliances installed in the air-
plane will be distributed. 

A23.2

Format 

(a) The Instructions for Continued Air-

worthiness must be in the form of a manual 
or manuals as appropriate for the quantity 
of data to be provided. 

(b) The format of the manual or manuals 

must provide for a practical arrangement. 

A23.3

Content 

The contents of the manual or manuals 

must be prepared in the English language. 
The Instructions for Continued Airworthi-
ness must contain the following manuals or 
sections and information: 

(a) Airplane maintenance manual or sec-

tion. 

(1) Introduction information that includes 

an explanation of the airplane’s features and 
data to the extent necessary for mainte-
nance or preventive maintenance. 

(2) A description of the airplane and its 

systems and installations including its en-
gines, propellers, and appliances. 

(3) Basic control and operation information 

describing how the airplane components and 
systems are controlled and how they oper-
ate, including any special procedures and 
limitations that apply. 

(4) Servicing information that covers de-

tails regarding servicing points, capacities of 
tanks, reservoirs, types of fluids to be used, 
pressures applicable to the various systems, 
location of access panels for inspection and 
servicing, locations of lubrication points, lu-
bricants to be used, equipment required for 
servicing, tow instructions and limitations, 
mooring, jacking, and leveling information. 

(b) Maintenance Instructions. 
(1) Scheduling information for each part of 

the airplane and its engines, auxiliary power 
units, propellers, accessories, instruments, 
and equipment that provides the rec-
ommended periods at which they should be 
cleaned, inspected, adjusted, tested, and lu-
bricated, and the degree of inspection, the 
applicable wear tolerances, and work rec-
ommended at these periods. However, the ap-
plicant may refer to an accessory, instru-
ment, or equipment manufacturer as the 
source of this information if the applicant 
shows that the item has an exceptionally 
high degree of complexity requiring special-
ized maintenance techniques, test equip-
ment, or expertise. The recommended over-
haul periods and necessary cross reference to 
the Airworthiness Limitations section of the 
manual must also be included. In addition, 
the applicant must include an inspection 
program that includes the frequency and ex-
tent of the inspections necessary to provide 
for the continued airworthiness of the air-
plane. 

(2) Troubleshooting information describing 

probable malfunctions, how to recognize 
those malfunctions, and the remedial action 
for those malfunctions. 

(3) Information describing the order and 

method of removing and replacing products 
and parts with any necessary precautions to 
be taken. 

(4) Other general procedural instructions 

including procedures for system testing dur-
ing ground running, symmetry checks, 
weighing and determining the center of grav-
ity, lifting and shoring, and storage limita-
tions. 

(c) Diagrams of structural access plates 

and information needed to gain access for in-
spections when access plates are not pro-
vided. 

(d) Details for the application of special in-

spection techniques including radiographic 
and ultrasonic testing where such processes 
are specified by the applicant. 

(e) Information needed to apply protective 

treatments to the structure after inspection. 

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