Appendix H to Part 25 - Instructions for Continued Airworthiness
14:1.0.1.3.12.12.121.1.13 : Appendix H
Appendix H to Part 25 - Instructions for Continued Airworthiness
H25.1
General.
(a) This appendix specifies requirements for preparation of
Instructions for Continued Airworthiness as required by §§ 25.1529,
25.1729, and applicable provisions of parts 21 and 26 of this
chapter.
(b) The Instructions for Continued Airworthiness 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 airplane. If Instructions for Continued
Airworthiness are not supplied by the manufacturer 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 Instructions for Continued Airworthiness made by the
applicant or by the manufacturers or products and appliances
installed in the airplane will be distributed.
H25.2
Format.
(a) The Instructions for Continued Airworthiness 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 Airworthiness 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
maintenance or preventive maintenance.
(2) A description of the airplane and its systems and
installations including its engines, propellers, and
appliances.
(3) Basic control and operation information describing how the
airplane components and systems are controlled and how they
operate, including any special procedures and limitations that
apply.
(4) Servicing information that covers details 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, lubricants 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, adjusted, 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 accessory,
instrument, or equipment manufacturer as the source of this
information if the applicant shows that the item has an
exceptionally high degree of complexity requiring specialized
maintenance techniques, test equipment, or expertise. The
recommended overhaul periods and necessary cross references 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 extent of the inspections
necessary to provide for the continued airworthiness 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 during ground running, symmetry checks, weighing
and determining the center of gravity, lifting and shoring, and
storage limitations.
(c) Diagrams of structural access plates and information needed
to gain access for inspections when access plates are not
provided.
(d) Details for the application of special inspection 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 recommendations, and torque values.
(g) A list of special tools needed.
H25.4
Airworthiness Limitations section.
(a) The Instructions for Continued Airworthiness must contain a
section titled Airworthiness Limitations that is segregated and
clearly distinguishable from the rest of the document. This section
must set forth -
(1) Each mandatory modification time, replacement time,
structural inspection interval, and related structural inspection
procedure approved under § 25.571.
(2) Each mandatory replacement time, inspection interval,
related inspection procedure, 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 maintenance program (LOV), stated as a total number
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 airplane cannot be greater than 1/2 the number of cycles
accumulated on the fatigue test article.
(5) Each mandatory replacement time, inspection interval, and
related inspection and test procedure, and each critical design
configuration control limitation for each lightning protection
feature approved under § 25.954.
(b) If the Instructions for Continued Airworthiness 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 a prominent location that reads: “The
Airworthiness Limitations section is FAA-approved and specifies
maintenance required under §§ 43.16 and 91.403 of the Federal
Aviation Regulations, unless an alternative program has been FAA
approved.”
H25.5 Electrical Wiring Interconnection System (EWIS)
Instructions for Continued Airworthiness.
(a) The applicant must prepare Instructions for Continued
Airworthiness (ICA) applicable to EWIS as defined by § 25.1701 that
are approved by the FAA and include the following:
(1) Maintenance and inspection requirements for the EWIS
developed with the use of an enhanced zonal analysis procedure that
includes:
(i) Identification of each zone of the airplane.
(ii) Identification of each zone that contains EWIS.
(iii) Identification of each zone containing EWIS that also
contains combustible materials.
(iv) Identification of each zone in which EWIS is in close
proximity to both primary and back-up hydraulic, mechanical, or
electrical flight controls and lines.
(v) Identification of -
(A) Tasks, and the intervals for performing those tasks, that
will reduce the likelihood of ignition sources and accumulation of
combustible material, and
(B) Procedures, and the intervals for performing those
procedures, that will effectively clean the EWIS components of
combustible material if there is not an effective task to reduce
the likelihood of combustible material accumulation.
(vi) Instructions for protections and caution information that
will minimize contamination and accidental damage to EWIS, as
applicable, during performance of maintenance, alteration, or
repairs.
(2) Acceptable EWIS maintenance practices in a standard
format.
(3) Wire separation requirements as determined under §
25.1707.
(4) Information explaining the EWIS identification method and
requirements for identifying any changes to EWIS under §
25.1711.
(5) Electrical load data and instructions for updating that
data.
(b) The EWIS ICA developed in accordance with the requirements
of H25.5(a)(1) must be in the form of a document appropriate for
the information to be provided, and they must be easily
recognizable as EWIS ICA. This document must either contain the
required EWIS ICA or specifically reference other portions of the
ICA that contain this information.
[Amdt. 25-54, 45 FR 60177, Sept. 11, 1980, as amended by Amdt.
25-68, 54 FR 34329, Aug. 18, 1989; Amdt. 25-102, 66 FR 23130, May
7, 2001; Amdt. 25-123, 72 FR 63408, Nov. 8, 2007; Amdt. 25-132, 75
FR 69782, Nov. 15, 2010; Doc. No. FAA-2014-1027, Amdt. No. 25-146,
83 FR 47557, Sept. 20, 2018]