Federal Aviation Administration, DOT

Section 27.1337

static pressure source being open or
blocked.
(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. 27-13, 42 FR 36972, July 18,
1977]

Section 27.1327

Magnetic direction indicator.

(a) Except as provided in paragraph
(b) of this section - 
(1) Each magnetic direction indicator
must be installed so that its accuracy
is not excessively affected by the
rotorcraft-s vibration or magnetic
fields; and
(2) The compensated installation may
not have a deviation, in level flight,
greater than 10 degrees on any heading.
(b) A magnetic nonstabilized direction indicator may deviate more than
10 degrees due to the operation of electrically powered systems such as electrically heated windshields if either a
magnetic stabilized direction indicator, which does not have a deviation
in level flight greater than 10 degrees
on any heading, or a gyroscopic direction indicator, is installed. Deviations
of a magnetic nonstabilized direction
indicator of more than 10 degrees must
be placarded in accordance with
Section 27.1547(e).
(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)))
[Amdt. 27-13, 42 FR 36972, July 18, 1977]

spaschal on DSK3GDR082PROD with CFR

Section 27.1329

Automatic pilot system.

(a) Each automatic pilot system
must be designed so that the automatic
pilot can - 
(1) Be sufficiently overpowered by
one pilot to allow control of the rotorcraft; and
(2) Be readily and positively disengaged by each pilot to prevent it
from interfering with control of the
rotorcraft.
(b) Unless there is automatic synchronization, each system must have a
means to readily indicate to the pilot
the alignment of the actuating device

in relation to the control system it operates.
(c) Each manually operated control
for the system-s operation must be
readily accessible to the pilots.
(d) The system must be designed and
adjusted so that, within the range of
adjustment available to the pilot, it
cannot produce hazardous loads on the
rotorcraft or create hazardous deviations in the flight path under any
flight condition appropriate to its use,
either during normal operation or in
the event of a malfunction, assuming
that corrective action begins within a
reasonable period of time.
(e) If the automatic pilot integrates
signals from auxiliary controls or furnishes signals for operation of other
equipment, there must be positive
interlocks and sequencing of engagement to prevent improper operation.
(f) If the automatic pilot system can
be coupled to airborne navigation
equipment, means must be provided to
indicate to the pilots the current mode
of operation. Selector switch position
is not acceptable as a means of indication.
[Amdt. 27-21, 49 FR 44435, Nov. 6, 1984, as
amended by Amdt. 27-35, 63 FR 43285, Aug. 12,
1998]

Section 27.1335

Flight director systems.

If a flight director system is installed, means must be provided to indicate to the flight crew its current
mode of operation. Selector switch position is not acceptable as a means of
indication.
(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)))
[Amdt. 27-13, 42 FR 36972, July 18, 1977]

Section 27.1337

Powerplant instruments.

(a) Instruments and instrument lines.
(1) Each powerplant instrument line
must meet the requirements of SectionSection 27.961 and 27.993.
(2) Each line carrying flammable
fluids under pressure must - 
(i) Have restricting orifices or other
safety devices at the source of pressure
to prevent the escape of excessive fluid
if the line fails; and

549

VerDate Sep<11>2014

12:50 Apr 30, 2019

Jkt 247046

PO 00000

Frm 00559

Fmt 8010

Sfmt 8010

Y:\SGML\247046.XXX

247046