Section 29.871

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

in the flight manual for the weights,
altitudes, and temperatures for which
external load approval is requested.
(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 29.25 and this section.
(f) The fatigue evaluation of Section 29.571
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 29.571 of this part applies to the entire
quick release and personnel carrying
device structural systems and their attachments.
[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]

MISCELLANEOUS
Section 29.871 Leveling marks.
There must be reference marks for
leveling the rotorcraft on the ground.
Section 29.873 Ballast provisions.
Ballast provisions must be designed
and constructed to prevent inadvertent
shifting of ballast in flight.

Subpart E - Powerplant

spaschal on DSK3GDR082PROD with CFR

GENERAL

(1) Is necessary for propulsion;
(2) Affects the control of the major
propulsive units; or
(3) Affects the safety of the major
propulsive units between normal inspections or overhauls.
(b) For each powerplant installation - 
(1) The installation must comply
with - 
(i) The installation instructions provided under Section 33.5 of this chapter; and
(ii) The applicable provisions of this
subpart.
(2) Each component of the installation must be constructed, arranged,
and installed to ensure its continued
safe operation between normal inspections or overhauls for the range of temperature and altitude for which approval is requested.
(3) Accessibility must be provided to
allow any inspection and maintenance
necessary for continued airworthiness;
and
(4) Electrical interconnections must
be provided to prevent differences of
potential between major components of
the installation and the rest of the
rotorcraft.
(5) Axial and radial expansion of turbine engines may not affect the safety
of the installation.
(6) Design precautions must be taken
to minimize the possibility of incorrect
assembly of components and equipment
essential to safe operation of the rotorcraft, except where operation with the
incorrect assembly can be shown to be
extremely improbable.
(c) For each powerplant and auxiliary
power unit installation, it must be established that no single failure or malfunction or probable combination of
failures will jeopardize the safe operation of the rotorcraft except that the
failure of structural elements need not
be considered if the probability of any
such failure is extremely remote.

Section 29.901 Installation.
(a) For the purpose of this part, the
powerplant installation includes each
part of the rotorcraft (other than the
main and auxiliary rotor structures)
that - 

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