spaschal on DSK3GDR082PROD with CFR

Section 27.871

14 CFR Ch. I (1-1-19 Edition)

location and must be designed and located so that it may be operated by either the pilot or a crewmember without hazardously limiting the ability to
control the rotorcraft during an emergency situation.
(2) A control for the backup quick release subsystem, readily accessible to
either the pilot or another crewmember, 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 electromagnetic interference (EMI) from external and internal sources and against
lightning to prevent inadvertent load
release.
(A) The minimum level of protection
required for jettisonable rotorcraftload 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 rotorcraftload combinations used for human external 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 subsystem, and
(ii) Provides a separate dual actuation device for the backup quick release subsystem;
(2) Have a reliable, approved personnel 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 instructions and, for the personnel carrying

device system, the ingress and egress
instructions;
(4) Have equipment to allow direct
intercommunication among required
crewmembers and external occupants;
and
(5) Have the appropriate limitations
and procedures incorporated in the
flight manual for conducting human
external cargo operations.
(d) The critically configured jettisonable external loads must be shown by a
combination of analysis, ground tests,
and flight tests to be both transportable and releasable throughout the approved operational envelope without
hazard to the rotorcraft during normal
flight conditions. In addition, these external loads must be shown to be releasable without hazard to the rotorcraft during emergency flight conditions.
(e) A placard or marking must be installed next to the external-load attaching means clearly stating any
operational limitations and the maximum authorized external load as demonstrated under Section 27.25 and this section.
(f) The fatigue evaluation of Section 27.571
of this part does not apply to rotorcraft-load combinations to be used for
nonhuman external cargo except for
the failure of critical structural elements that would result in a hazard to
the rotorcraft. For rotorcraft-load
combinations to be used for human external cargo, the fatigue evaluation of
Section 27.571 of this part applies to the entire
quick release and personnel carrying
device structural systems and their attachments.
[Amdt. 27-11, 41 FR 55469, Dec. 20, 1976, as
amended by Amdt. 27-26, 55 FR 8001, Mar. 6,
1990; Amdt. 27-36, 64 FR 43019, Aug. 6, 1999]

MISCELLANEOUS
Section 27.871

Leveling marks.

There must be reference marks for
leveling the rotorcraft on the ground.
Section 27.873

Ballast provisions.

Ballast provisions must be designed
and constructed to prevent inadvertent
shifting of ballast in flight.

526

VerDate Sep<11>2014

12:50 Apr 30, 2019

Jkt 247046

PO 00000

Frm 00536

Fmt 8010

Sfmt 8010

Y:\SGML\247046.XXX

247046