Code of Federal Regulations - Title 14

805

Federal Aviation Administration, DOT

§ 29.1321

(1) The function is not adversely af-

fected during and after the time the
rotorcraft is exposed to HIRF environ-
ment I, as described in appendix E to
this part;

(2) The system automatically recov-

ers normal operation of that function,
in a timely manner, after the rotor-
craft is exposed to HIRF environment
I, as described in appendix E to this
part, unless this conflicts with other
operational or functional requirements
of that system;

(3) The system is not adversely af-

fected during and after the time the
rotorcraft is exposed to HIRF environ-
ment II, as described in appendix E to
this part; and

(4) Each function required during op-

eration under visual flight rules is not
adversely affected during and after the
time the rotorcraft is exposed to HIRF
environment III, as described in appen-
dix E to this part.

(b) Each electrical and electronic

system that performs a function whose
failure would significantly reduce the
capability of the rotorcraft or the abil-
ity of the flightcrew to respond to an
adverse operating condition must be
designed and installed so the system is
not adversely affected when the equip-
ment providing these functions is ex-
posed to equipment HIRF test level 1
or 2, as described in appendix E to this
part.

tem that performs such a function
whose failure would reduce the capa-
bility of the rotorcraft or the ability of
the flightcrew to respond to an adverse
operating condition must be designed
and installed so the system is not ad-
versely affected when the equipment
providing these functions is exposed to
equipment HIRF test level 3, as de-
scribed in appendix E to this part.

(d) Before December 1, 2012, an elec-

trical or electronic system that per-
forms a function whose failure would
prevent the continued safe flight and
landing of a rotorcraft may be designed
and installed without meeting the pro-
visions of paragraph (a) provided—

(1) The system has previously been

shown to comply with special condi-
tions for HIRF, prescribed under § 21.16,
issued before December 1, 2007;

(2) The HIRF immunity characteris-

tics of the system have not changed
since compliance with the special con-
ditions was demonstrated; and

(3) The data used to demonstrate

compliance with the special conditions
is provided.

[Doc. No. FAA–2006–23657, 72 FR 44027, Aug. 6,
2007]

NSTRUMENTS

: I

NSTALLATION

§ 29.1321

Arrangement and visibility.

(a) Each flight, navigation, and pow-

erplant instrument for use by any pilot
must be easily visible to him from his
station with the minimum practicable
deviation from his normal position and
line of vision when he is looking for-
ward along the flight path.

(b) Each instrument necessary for

safe operation, including the airspeed
indicator, gyroscopic direction indi-
cator, gyroscopic bank-and-pitch indi-
cator, slip-skid indicator, altimeter,
rate-of-climb indicator, rotor tachom-
eters, and the indicator most rep-
resentative of engine power, must be
grouped and centered as nearly as prac-
ticable about the vertical plane of the
pilot’s forward vision. In addition, for
rotorcraft approved for IFR flight—

(1) The instrument that most effec-

tively indicates attitude must be on
the panel in the top center position;

(2) The instrument that most effec-

tively indicates direction of flight
must be adjacent to and directly below
the attitude instrument;

(3) The instrument that most effec-

tively indicates airspeed must be adja-
cent to and to the left of the attitude
instrument; and

(4) The instrument that most effec-

tively indicates altitude or is most fre-
quently utilized in control of altitude
must be adjacent to and to the right of
the attitude instrument.

ments must be closely grouped on the
instrument panel.

(d) Identical powerplant instruments

for the engines must be located so as to
prevent any confusion as to which en-
gine each instrument relates.

(e) Each powerplant instrument vital

to safe operation must be plainly visi-
ble to appropriate crewmembers.

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