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14 CFR Ch. I (1–1–24 Edition)
§ 27.861
§ 27.861
Fire protection of structure,
controls, and other parts.
Each part of the structure, controls,
rotor mechanism, and other parts es-
sential to a controlled landing that
would be affected by powerplant fires
must be fireproof or protected so they
can perform their essential functions
for at least 5 minutes under any fore-
seeable powerplant fire conditions.
[Amdt. 27–26, 55 FR 8001, Mar. 6, 1990]
§ 27.863
Flammable fluid fire protec-
tion.
(a) In each area where flammable
fluids or vapors might escape by leak-
age of a fluid system, there must be
means to minimize the probability of
ignition of the fluids and vapors, and
the resultant hazards if ignition does
occur.
(b) Compliance with paragraph (a) of
this section must be shown by analysis
or tests, and the following factors must
be considered:
(1) Possible sources and paths of fluid
leakage, and means of detecting leak-
age.
(2) Flammability characteristics of
fluids, including effects of any combus-
tible or absorbing materials.
(3) Possible ignition sources, includ-
ing electrical faults, overheating of
equipment, and malfunctioning of pro-
tective devices.
(4) Means available for controlling or
extinguishing a fire, such as stopping
flow of fluids, shutting down equip-
ment, fireproof containment, or use of
extinguishing agents.
(5) Ability of rotorcraft components
that are critical to safety of flight to
withstand fire and heat.
(c) If action by the flight crew is re-
quired to prevent or counteract a fluid
fire (e.g. equipment shutdown or actu-
ation of a fire extinguisher) quick act-
ing means must be provided to alert
the crew.
(d) Each area where flammable fluids
or vapors might escape by leakage of a
fluid system must be identified and de-
fined.
(Secs. 313(a), 601, 603, 604, Federal Aviation
Act of 1958 (49 U.S.C. 1354(a), 1421, 1423, 1424),
sec. 6(c), Dept. of Transportation Act (49
U.S.C. 1655(c)))
[Amdt. 27–16, 43 FR 50599, Oct. 30, 1978]
E
XTERNAL
L
OADS
§ 27.865
External loads.
(a) It must be shown by analysis,
test, or both, that the rotorcraft exter-
nal load attaching means for rotor-
craft-load combinations to be used for
nonhuman external cargo applications
can withstand a limit static load equal
to 2.5, or some lower load factor ap-
proved under §§ 27.337 through 27.341,
multiplied by the maximum external
load for which authorization is re-
quested. It must be shown by analysis,
test, or both that the rotorcraft exter-
nal load attaching means and cor-
responding personnel carrying device
system for rotorcraft-load combina-
tions to be used for human external
cargo applications can withstand a
limit static load equal to 3.5 or some
lower load factor, not less than 2.5, ap-
proved under §§ 27.337 through 27.341,
multiplied by the maximum external
load for which authorization is re-
quested. The load for any rotorcraft-
load combination class, for any exter-
nal cargo type, must be applied in the
vertical direction. For jettisonable ex-
ternal loads of any applicable external
cargo type, the load must also be ap-
plied in any direction making the max-
imum angle with the vertical that can
be achieved in service but not less than
30
°
. However, the 30
°
angle may be re-
duced to a lesser angle if—
(1) An operating limitation is estab-
lished limiting external load oper-
ations to such angles for which compli-
ance with this paragraph has been
shown; or
(2) It is shown that the lesser angle
can not be exceeded in service.
(b) The external load attaching
means, for jettisonable rotorcraft-load
combinations, must include a quick-re-
lease system to enable the pilot to re-
lease the external load quickly during
flight. The quick-release system must
consist of a primary quick release sub-
system and a backup quick release sub-
system that are isolated from one an-
other. The quick-release system, and
the means by which it is controlled,
must comply with the following:
(1) A control for the primary quick
release subsystem must be installed ei-
ther on one of the pilot’s primary con-
trols or in an equivalently accessible
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