567 

Federal Aviation Administration, DOT 

Pt. 27, App. B 

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) 

Rotorcraft maintenance manual or section. 

(1) Introduction information that includes an 
explanation of the rotorcraft’s features and 
data to the extent necessary for mainte-
nance or preventive maintenance. 

(2) A description of the rotorcraft and its 

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

(3) Basic control and operation information 

describing how the rotorcraft components 
and systems are controlled and how they op-
erate, 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, the 
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 rotorcraft 
and its engines, auxiliary power units, ro-
tors, 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 the item has an exception-
ally high degree of complexity requiring spe-
cialized maintenance techniques, test equip-
ment, or expertise. The recommended over-
haul periods and necessary cross references 
to the Airworthiness Limitations section of 
the manual must also be included. In addi-
tion, the applicant must include an inspec-
tion program that includes the frequency 
and extent of the inspections necessary to 
provide for the continued airworthiness of 
the rotorcraft. 

(2) Troubleshooting information describing 

problem 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, discarded rec-
ommendations, and torque values. 

(g) A list of special tools needed. 

A27.4

Airworthiness Limitations section. 

The Instructions for Continued Airworthi-

ness 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 
each mandatory replacement time, struc-
tural inspection interval, and related struc-
tural inspection procedure required for type 
certification. If the Instructions for Contin-
ued Airworthiness consist of multiple docu-
ments, the section required by this para-
graph must be included in the principal man-
ual. This section must contain a legible 
statement in a prominent location that 
reads: ‘‘The Airworthiness Limitations sec-
tion is FAA approved and specifies inspec-
tions and other maintenance required under 
§§ 43.16 and 91.403 of the Federal Aviation 
Regulations unless an alternative program 
has been FAA approved.’’ 

[Amdt. 27–18, 45 FR 60177, Sept. 11, 1980, as 
amended by Amdt. 27–24, 54 FR 34329, Aug. 18, 
1989; Amdt. 27–47, 76 FR 74663, Dec. 1, 2011] 

A

PPENDIX

B 

TO

P

ART

27—A

IRWORTHI

-

NESS

C

RITERIA FOR

H

ELICOPTER

I

N

-

STRUMENT

F

LIGHT

 

I. 

General. 

A normal category helicopter 

may not be type certificated for operation 
under the instrument flight rules (IFR) of 
this chapter unless it meets the design and 
installation requirements contained in this 
appendix. 

II. 

Definitions. 

(a) V

YI

means instrument 

climb speed, utilized instead of V

Y

for com-

pliance with the climb requirements for in-
strument flight. 

(b) V

NEI

means instrument flight never ex-

ceed speed, utilized instead of V

NE

for com-

pliance with maximum limit speed require-
ments for instrument flight. 

(c) V

MINI

means instrument flight min-

imum speed, utilized in complying with min-
imum limit speed requirements for instru-
ment flight. 

III. 

Trim. 

It must be possible to trim the 

cyclic, collective, and directional control 
forces to zero at all approved IFR airspeeds, 
power settings, and configurations appro-
priate to the type. 

IV. 

Static longitudinal stability. 

(a) 

General. 

The helicopter must possess positive static 

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