739 

Federal Aviation Administration, DOT 

Pt. 33, App. A 

(4) Basic control and operating information 

describing how the engine components, sys-
tems, and installations operate, and informa-
tion describing the methods of starting, run-
ning, testing, and stopping the engine and its 
parts including any special procedures and 
limitations that apply. 

(5) 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, 
locations of lubrication points, lubricants to 
be used, and equipment required for serv-
icing. 

(6) Scheduling information for each part of 

the engine that provides the recommended 
periods at which it should be cleaned, in-
spected, 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 informa-
tion if the applicant shows that the item has 
an exceptionally high degree of complexity 
requiring specialized maintenance tech-
niques, test equipment, or expertise. The rec-
ommended overhaul periods and necessary 
cross references to the Airworthiness Limi-
tations section of the manual must also be 
included. In addition, the applicant must in-
clude an inspection program that includes 
the frequency and extent of the inspections 
necessary to provide for the continued air-
worthiness of the engine. 

(7) Troubleshooting information describing 

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

(8) Information describing the order and 

method of removing the engine and its parts 
and replacing parts, with any necessary pre-
cautions to be taken. Instructions for proper 
ground handling, crating, and shipping must 
also be included. 

(9) A list of the tools and equipment nec-

essary for maintenance and directions as to 
their method of use. 

(b) 

Engine Overhaul Manual or Section. 

(1) 

Disassembly information including the order 
and method of disassembly for overhaul. 

(2) Cleaning and inspection instructions 

that cover the materials and apparatus to be 
used and methods and precautions to be 
taken during overhaul. Methods of overhaul 
inspection must also be included. 

(3) Details of all fits and clearances rel-

evant to overhaul. 

(4) Details of repair methods for worn or 

otherwise substandard parts and components 
along with the information necessary to de-
termine when replacement is necessary. 

(5) The order and method of assembly at 

overhaul. 

(6) Instructions for testing after overhaul. 
(7) Instructions for storage preparation, in-

cluding any storage limits. 

(8) A list of tools needed for overhaul. 
(c) 

ETOPS Requirements. 

For an applicant 

seeking eligibility for an engine to be in-
stalled on an airplane approved for ETOPS, 
the Instructions for Continued Airworthiness 
must include procedures for engine condition 
monitoring. The engine condition moni-
toring procedures must be able to determine 
prior to flight, whether an engine is capable 
of providing, within approved engine oper-
ating limits, maximum continuous power or 
thrust, bleed air, and power extraction re-
quired for a relevant engine inoperative di-
version. For an engine to be installed on a 
two-engine airplane approved for ETOPS, the 
engine condition monitoring procedures 
must be validated before ETOPS eligibility 
is granted. 

A33.4

airworthiness limitations section 

The Instructions for Continued Airworthi-

ness must contain a section titled Airworthi-
ness Limitations that is segregated and 
clearly distinguishable from the rest of the 
manual. 

(a) For all engines: 
(1) The Airworthiness Limitations section 

must set forth each mandatory replacement 
time, inspection interval, and related proce-
dure required for type certification. If the In-
structions for Continued Airworthiness con-
sist of multiple documents, the section re-
quired under this paragraph must be in-
cluded in the principal manual. 

(2) This section must contain a legible 

statement in a prominent location that 
reads: ‘‘The Airworthiness Limitations sec-
tion is FAA approved and specifies mainte-
nance required under §§ 43.16 and 91.403 of 
Title 14 of the Code of Federal Regulations 
unless an alternative program has been FAA 
approved.’’ 

(b) For rotorcraft engines having 30-second 

OEI and 2-minute OEI ratings: 

(1) The Airworthiness Limitations section 

must also prescribe the mandatory post- 
flight inspections and maintenance actions 
associated with any use of either 30-second 
OEI or 2-minute OEI ratings. 

(2) The applicant must validate the ade-

quacy of the inspections and maintenance 
actions required under paragraph (b)(1) of 
this section A33.4. 

(3) The applicant must establish an in-serv-

ice engine evaluation program to ensure the 
continued adequacy of the instructions for 
mandatory post-flight inspections and main-
tenance actions prescribed under paragraph 
(b)(1) of this section A33.4 and of the data for 
§ 33.5(b)(4) pertaining to power availability. 
The program must include service engine 

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