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Federal Aviation Administration, DOT

§ 27.1555

(3) For the caution range, a yellow

arc.

(4) For the safe operating range, a

green arc.

(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]

§ 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
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 radial or a red line;

(b) Each normal operating range

must be marked with a green arc or
green line, not extending beyond the
maximum and minimum safe limits;

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

(d) Each engine or propeller range

that is restricted because of excessive
vibration stresses must be marked with
red arcs 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]

§ 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.

(2) For fuel systems having selector

controls, the usable fuel capacity

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