772
14 CFR Ch. I (1–1–14 Edition)
§ 29.871
(2) A control for the backup quick re-
lease subsystem, readily accessible to
either the pilot or another crew-
member, must be provided.
(3) Both the primary and backup
quick release subsystems must—
(i) Be reliable, durable, and function
properly with all external loads up to
and including the maximum external
limit load for which authorization is
requested.
(ii) Be protected against electro-
magnetic interference (EMI) from ex-
ternal and internal sources and against
lightning to prevent inadvertent load
release.
(A) The minimum level of protection
required for jettisonable rotorcraft-
load combinations used for nonhuman
external cargo is a radio frequency
field strength of 20 volts per meter.
(B) The minimum level of protection
required for jettisonable rotorcraft-
load combinations used for human ex-
ternal cargo is a radio frequency field
strength of 200 volts per meter.
(iii) Be protected against any failure
that could be induced by a failure mode
of any other electrical or mechanical
rotorcraft system.
(c) For rotorcraft-load combinations
to be used for human external cargo
applications, the rotorcraft must—
(1) For jettisonable external loads,
have a quick-release system that meets
the requirements of paragraph (b) of
this section and that—
(i) Provides a dual actuation device
for the primary quick release sub-
system, and
(ii) Provides a separate dual actu-
ation device for the backup quick re-
lease subsystem;
(2) Have a reliable, approved per-
sonnel carrying device system that has
the structural capability and personnel
safety features essential for external
occupant safety;
(3) Have placards and markings at all
appropriate locations that clearly state
the essential system operating instruc-
tions and, for the personnel carrying
device system, ingress and egress in-
structions;
(4) Have equipment to allow direct
intercommunication among required
crewmembers and external occupants;
(5) Have the appropriate limitations
and procedures incorporated in the
flight manual for conducting human
external cargo operations; and
(6) For human external cargo applica-
tions requiring use of Category A
rotorcraft, have one-engine-inoperative
hover performance data and procedures
in the flight manual for the weights,
altitudes, and temperatures for which
external load approval is requested.
(d) The critically configured jettison-
able external loads must be shown by a
combination of analysis, ground tests,
and flight tests to be both transport-
able and releasable throughout the ap-
proved operational envelope without
hazard to the rotorcraft during normal
flight conditions. In addition, these ex-
ternal loads—must be shown to be re-
leasable without hazard to the rotor-
craft during emergency flight condi-
tions.
(e) A placard or marking must be in-
stalled next to the external-load at-
taching means clearly stating any
operational limitations and the max-
imum authorized external load as dem-
onstrated under § 29.25 and this section.
(f) The fatigue evaluation of § 29.571
of this part does not apply to rotor-
craft-load combinations to be used for
nonhuman external cargo except for
the failure of critical structural ele-
ments that would result in a hazard to
the rotorcraft. For rotorcraft-load
combinations to be used for human ex-
ternal cargo, the fatigue evaluation of
§ 29.571 of this part applies to the entire
quick release and personnel carrying
device structural systems and their at-
tachments.
[Amdt. 29–12, 41 FR 55472, Dec. 20, 1976, as
amended by Amdt. 27–26, 55 FR 8005, Mar. 6,
1990; Amdt. 29–43, 64 FR 43020, Aug. 6, 1999]
M
ISCELLANEOUS
§ 29.871
Leveling marks.
There must be reference marks for
leveling the rotorcraft on the ground.
§ 29.873
Ballast provisions.
Ballast provisions must be designed
and constructed to prevent inadvertent
shifting of ballast in flight.
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