675
Federal Aviation Administration, DOT
§ 29.1555
(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.
§ 29.1545
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
NE
.
(ii) For helicopters, at V
NE
(power-
on).
(iii) For helicopters, at V
NE
(power-
off). If V
NE
(power-off) is less than V
NE
(power-on) and both are simulta-
neously displayed, the red line at V
NE
(power-off) must be clearly distinguish-
able from the red line at V
NE
(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), Dept.
of Transportation Act (49 U.S.C. 1655(c)))
[Doc. No. 5084, 29 FR 16150, Dec. 3, 1964, as
amended by Amdt. 29–15, 43 FR 2327, Jan. 16,
1978; 43 FR 3900, Jan. 30, 1978; Amdt. 29–17, 43
FR 50602, Oct. 30, 1978; Amdt. 29–59, 88 FR
8740, Feb. 10, 2023]
§ 29.1547
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.
(c) The placard must state whether
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.
§ 29.1549
Powerplant instruments.
For each required powerplant instru-
ment, as appropriate to the type of in-
struments—
(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;
(c) Each takeoff and precautionary
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. 29–12, 41 FR 55474, Dec. 20, 1976, as
amended by Amdt. 29–26, 53 FR 34220, Sept. 2,
1988; Amdt. 29–34, 59 FR 47769, Sept. 16, 1994;
Amdt. 29–59, 88 FR 8739, Feb. 10, 2023]
§ 29.1551
Oil quantity indicator.
Each oil quantity indicator must be
marked with enough increments to in-
dicate readily and accurately the quan-
tity of oil.
§ 29.1553
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.
§ 29.1555
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 valve con-
trol must be marked to indicate the po-
sition 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
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