Code of Federal Regulations - Title 14

325

Federal Aviation Administration, DOT

§ 23.1555

§ 23.1547

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 headings in not
more than 30 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.

[Doc. No. 4080, 29 FR 17955, Dec. 18, 1964; 30
FR 258, Jan. 9, 1965, as amended by Amdt. 23–
20, 42 FR 36969, July 18, 1977]

§ 23.1549

Powerplant and auxiliary

power unit instruments.

For each required powerplant and

auxiliary power unit instrument, as ap-
propriate to the type of instruments—

(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 a yellow line; and

(d) Each engine, auxiliary power

unit, or propeller range that is re-
stricted because of excessive vibration
stresses must be marked with red arcs
or red lines.

[Amdt. 23–12, 41 FR 55466, Dec. 20, 1976, as
amended by Amdt. 23–28, 47 FR 13315, Mar. 29,
1982; Amdt. 23–45, 58 FR 42166, Aug. 6, 1993]

§ 23.1551

Oil quantity indicator.

Each oil quantity indicator must be

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

§ 23.1553

Fuel quantity indicator.

A red radial line must be marked on

each indicator at the calibrated zero
reading, as specified in § 23.1337(b)(1).

[Doc. No. 27807, 61 FR 5193, Feb. 9, 1996]

§ 23.1555

Control markings.

(a) Each cockpit control, other than

primary flight controls and simple
push button type starter switches,
must be plainly marked as to its func-
tion and method of operation.

(b) Each secondary control must be

suitably marked.

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
near the selector for those tanks;

(3) The conditions under which the

full amount of usable fuel in any re-
stricted usage fuel tank can safely be
used must be stated on a placard adja-
cent to the selector valve for that
tank; and

(4) Each valve control for any engine

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

(d) Usable fuel capacity must be

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
available at each selector control posi-
tion must be indicated near the selec-
tor control.

(3) For fuel systems having a cali-

brated fuel quantity indication system
complying with § 23.1337(b)(1) and accu-
rately displaying the actual quantity
of usable fuel in each selectable tank,
no fuel capacity placards outside of the
fuel quantity indicator are required.

(e) For accessory, auxiliary, and

emergency controls—

(1) If retractable landing gear is used,

the indicator required by § 23.729 must
be marked so that the pilot can, at any
time, ascertain that the wheels are se-
cured in the extreme positions; and

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