title-14-part-27-sec27-1547

563

Federal Aviation Administration, DOT

§ 27.1547

with the applicable certification re-
quirements and by the installed equip-
ment.

[Amdt. 27–21, 49 FR 44435, Nov. 6, 1984]

§ 27.1527

Maximum operating altitude.

The maximum altitude up to which

operation is allowed, as limited by
flight, structural, powerplant, func-
tional, or equipment characteristics,
must be established.

(Secs. 313(a), 601, 603, 604, and 605 of the Fed-
eral Aviation Act of 1958 (49 U.S.C. 1354(a),
1421, 1423, 1424, and 1425); and sec. 6(c) of the
Dept. of Transportation Act (49 U.S.C.
1655(c)))

[Amdt. 27–14, 43 FR 2325, Jan. 16, 1978]

§ 27.1529

Instructions for Continued

Airworthiness.

The applicant must prepare Instruc-

tions for Continued Airworthiness in
accordance with appendix A to this
part that are acceptable to the Admin-
istrator. The instructions may be in-
complete at type certification if a pro-
gram exists to ensure their completion
prior to delivery of the first rotorcraft
or issuance of a standard certificate of
airworthiness, whichever occurs later.

[Amdt. 27–18, 45 FR 60177, Sept. 11, 1980]

ARKINGS AND

LACARDS

§ 27.1541

General.

(a) The rotorcraft must contain—
(1) The markings and placards speci-

fied in §§ 27.1545 through 27.1565, and

(2) Any additional information, in-

strument markings, and placards re-
quired for the safe operation of rotor-
craft with unusual design, operating or
handling characteristics.

(b) Each marking and placard pre-

scribed in paragraph (a) of this sec-
tion—

(1) Must be displayed in a con-

spicuous place; and

(2) May not be easily erased, dis-

figured, or obscured.

§ 27.1543

Instrument markings: gen-

eral.

For each instrument—
(a) When markings are on the cover

glass of the instrument, there must be
means to maintain the correct align-

ment of the glass cover with the face of
the dial; and

(b) Each arc and line must be wide

enough, and located, to be clearly visi-
ble to the pilot.

§ 27.1545

Airspeed indicator.

(a) Each airspeed indicator must be

marked as specified in paragraph (b) of
this section, with the marks located at
the corresponding indicated airspeeds.

(b) The following markings must be

made:

(1) A red line—
(i) For rotorcraft other than heli-

copters, at V

(ii) For helicopters, at V

(power-

on).

(iii) For helicopters, at V

(power-

off). If V

(power-off) is less than V

(power-on) and both are simulta-
neously displayed, the red line at V

(power-off) must be clearly distinguish-
able from the red line at V

(power-

on).

(2) [Reserved]
(3) For the caution range, a yellow

range.

(4) For the normal operating range, a

green or unmarked range.

(Secs. 313(a), 601, 603, 604, and 605 of the Fed-
eral Aviation Act of 1958 (49 U.S.C. 1354(a),
1421, 1423, 1424, and 1425); and sec. 6(c) of the
Dept. of Transportation Act (49 U.S.C.
1655(c)))

[Doc. No. 5074, 29 FR 15695, Nov. 24, 1964, as
amended by Amdt. 27–14, 43 FR 2325, Jan. 16,
1978; 43 FR 3900, Jan. 30, 1978; Amdt. 27–16, 43
FR 50599, Oct. 30, 1978; Amdt. 27–51, 88 FR
8738, Feb. 10, 2023]

§ 27.1547

Magnetic direction indicator.

(a) A placard meeting the require-

ments of this section must be installed
on or near the magnetic direction indi-
cator.

(b) The placard must show the cali-

bration of the instrument in level
flight with the engines operating.

the calibration was made with radio re-
ceivers on or off.

(d) Each calibration reading must be

in terms of magnetic heading in not
more than 45 degree increments.

(e) If a magnetic nonstabilized direc-

tion indicator can have a deviation of
more than 10 degrees caused by the op-
eration of electrical equipment, the

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14 CFR Ch. I (1–1–24 Edition)

§ 27.1549

placard must state which electrical
loads, or combination of loads, would
cause a deviation of more than 10 de-
grees when turned on.

(Secs. 313(a), 601, 603, 604, and 605 of the Fed-
eral Aviation Act of 1958 (49 U.S.C. 1354(a),
1421, 1423, 1424, and 1425); and sec. 6(c) of the
Dept. of Transportation Act (49 U.S.C.
1655(c)))

[Doc. No. 5074, 29 FR 15695, Nov. 24, 1964, as
amended by Amdt. 27–13, 42 FR 36972, July 18,
1977]

§ 27.1549

Powerplant instruments.

For each required powerplant instru-

ment, as appropriate to the type of in-
strument—

(a) Each maximum and, if applicable,

minimum safe operating limit must be
marked with a red line;

(b) Each normal operating range

must be marked as a green or un-
marked range;

range must be marked with a yellow
range or yellow line;

(d) Each engine or rotor range that is

restricted because of excessive vibra-
tion stresses must be marked with red
ranges or red lines; and

(e) Each OEI limit or approved oper-

ating range must be marked to be
clearly differentiated from the mark-
ings of paragraphs (a) through (d) of
this section except that no marking is
normally required for the 30-second
OEI limit.

[Amdt. 27–11, 41 FR 55470, Dec. 20, 1976, as
amended by Amdt. 27–23, 53 FR 34215, Sept. 2,
1988; Amdt. 27–29, 59 FR 47768, Sept. 16, 1994;
Amdt. 27–51, 88 FR 8738, Feb. 10, 2023]

§ 27.1551

Oil quantity indicator.

Each oil quantity indicator must be

marked with enough increments to in-
dicate readily and accurately the quan-
tity of oil.

§ 27.1553

Fuel quantity indicator.

If the unusable fuel supply for any

tank exceeds one gallon, or five per-
cent of the tank capacity, whichever is
greater, a red arc must be marked on
its indicator extending from the cali-
brated zero reading to the lowest read-
ing obtainable in level flight.

§ 27.1555

Control markings.

(a) Each cockpit control, other than

primary flight controls or control
whose function is obvious, must be
plainly marked as to its function and
method of operation.

(b) For powerplant fuel controls—
(1) Each fuel tank selector control

must be marked to indicate the posi-
tion corresponding to each tank and to
each existing cross feed position;

(2) If safe operation requires the use

of any tanks in a specific sequence,
that sequence must be marked on, or
adjacent to, the selector for those
tanks; and

(3) Each valve control for any engine

of a multiengine rotorcraft must be
marked to indicate the position cor-
responding to each engine controlled.

marked as follows:

(1) For fuel systems having no selec-

tor controls, the usable fuel capacity of
the system must be indicated at the
fuel quantity indicator unless it is:

(i) Provided by another system or

equipment readily accessible to the
pilot; and

(ii) Contained in the limitations sec-

tion of the rotorcraft flight manual.

(2) For fuel systems having selector

controls, the usable fuel capacity
available at each selector control posi-
tion must be indicated near the selec-
tor control.

(d) For accessory, auxiliary, and

emergency controls—

(1) Each essential visual position in-

dicator, such as those showing rotor
pitch or landing gear position, must be
marked so that each crewmember can
determine at any time the position of
the unit to which it relates; and

(2) Each emergency control must be

red and must be marked as to method
of operation.

(e) For rotorcraft incorporating re-

tractable landing gear, the maximum
landing gear operating speed must be
displayed in clear view of the pilot.

[Doc. No. 5074, 29 FR 15695, Nov. 24, 1964, as
amended by Amdt. 27–11, 41 FR 55470, Dec. 20,
1976; Amdt. 27–21, 49 FR 44435, Nov. 6, 1984;
Amdt. 27–51, 88 FR 8738, Feb. 10, 2023]

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