603 

Federal Aviation Administration, DOT 

Pt. 25, App. H 

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 or 
products and appliances installed in the air-
plane will be distributed. 

H25.2

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. 

H25.3

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, as appropriate, and information: 

(a) 

Airplane maintenance manual or section. 

(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 recommended periods at 
which they should be cleaned, inspected, ad-
justed, tested, and lubricated, and the degree 
of inspection, the applicable wear tolerances, 
and work recommended at these periods. 
However, the applicant may refer to an ac-
cessory, instrument, or equipment manufac-
turer as the source of this information if the 
applicant shows that the item has an excep-
tionally high degree of complexity requiring 
specialized maintenance techniques, test 
equipment, or expertise. The recommended 
overhaul periods and necessary cross ref-
erences to the Airworthiness Limitations 
section of the manual must also be included. 
In addition, the applicant must include an 
inspection program that includes the fre-
quency and extent of the inspections nec-

essary to provide for the continued air-
worthiness of the airplane. 

(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. 

(e) Information needed to apply protective 

treatments to the structure after inspection. 

(f) All data relative to structural fasteners 

such as identification, discard recommenda-
tions, and torque values. 

(g) A list of special tools needed. 

H25.4

Airworthiness Limitations section. 

(a) The Instructions for Continued Air-

worthiness must contain a section titled Air-
worthiness Limitations that is segregated 
and clearly distinguishable from the rest of 
the document. This section must set forth— 

(1) Each mandatory modification time, re-

placement time, structural inspection inter-
val, and related structural inspection proce-
dure approved under § 25.571. 

(2) Each mandatory replacement time, in-

spection interval, related inspection proce-
dure, and all critical design configuration 
control limitations approved under § 25.981 
for the fuel tank system. 

(3) Any mandatory replacement time of 

EWIS components as defined in section 
25.1701. 

(4) A limit of validity of the engineering 

data that supports the structural mainte-
nance program (LOV), stated as a total num-
ber of accumulated flight cycles or flight 
hours or both, approved under § 25.571. Until 
the full-scale fatigue testing is completed 
and the FAA has approved the LOV, the 
number of cycles accumulated by the air-
plane cannot be greater than 

1

⁄

2

the number 

of cycles accumulated on the fatigue test ar-
ticle. 

(b) If the Instructions for Continued Air-

worthiness consist of multiple documents, 
the section required by this paragraph must 
be included in the principal manual. This 
section must contain a legible statement in 

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