Federal Aviation Administration, DOT

Section 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 Federal 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]

Section 27.1547 Magnetic direction indicator.
(a) A placard meeting the requirements of this section must be installed
on or near the magnetic direction indicator.
(b) The placard must show the calibration of the instrument in level
flight with the engines operating.
(c) The placard must state whether
the calibration was made with radio receivers 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 direction indicator can have a deviation of
more than 10 degrees caused by the operation of electrical equipment, the
placard must state which electrical
loads, or combination of loads, would
cause a deviation of more than 10 degrees when turned on.
(Secs. 313(a), 601, 603, 604, and 605 of the Federal 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)))

spaschal on DSK3GDR082PROD with CFR

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

Section 27.1549 Powerplant instruments.
For each required powerplant instrument, as appropriate to the type of instrument - 
(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;
(c) Each takeoff and precautionary
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 operating range must be marked to be
clearly differentiated from the markings 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]

Section 27.1551

Oil quantity indicator.

Each oil quantity indicator must be
marked with enough increments to indicate readily and accurately the quantity of oil.
Section 27.1553

Fuel quantity indicator.

If the unusable fuel supply for any
tank exceeds one gallon, or five percent of the tank capacity, whichever is
greater, a red arc must be marked on
its indicator extending from the calibrated zero reading to the lowest reading obtainable in level flight.
Section 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 position 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 corresponding to each engine controlled.
(c) Usable fuel capacity must be
marked as follows:
(1) For fuel systems having no selector 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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