Pt. 121, App. C

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

[Doc. No. 25530, 53 FR 26147, July 11, 1988; 53 FR 30906, Aug. 16, 1988]

APPENDIX C TO PART 121 - C-46
NONTRANSPORT CATEGORY AIRPLANES
Cargo Operations
1. Required engines. (a) Except as provided
in paragraph (b) of this section, the engines
specified in subparagraphs (1) or (2) of this
section must be installed in C-46 nontransport category airplanes operated at
gross weights exceeding 45,000 pounds:
(1) Pratt and Whitney R2800-51-M1 or
R2800-75-M1 engines (engines converted from
basic model R2800-51 or R2800-75 engines in
accordance with FAA approved data) that - 
(i) Conform to Engine Specification 5E-8;
(ii) Conform to the applicable portions of
the operator-s manual;
(iii) Comply with all the applicable airworthiness directives; and
(iv) Are equipped with high capacity oil
pump drive gears in accordance with FAA
approved data.
(2) Other engines found acceptable by the
Flight Standards office having type certification responsibility for the C-46 airplane.
(b) Upon application by an operator conducting cargo operations with nontransport
category C-46 airplanes between points within the State of Alaska, the responsible
Flight Standards office may authorize the
operation of such airplanes, between points
within the State of Alaska; without compliance with paragraph (a) of this section if the
operator shows that, in its area of operation,
installation of the modified engines is not
necessary to provide adequate cooling for
single-engine operations. Such authorization
and any conditions or limitations therefor is
made a part of the Operations Specifications
of the operator.
2. Minimum acceptable means of complying
with the special airworthiness requirements.
Unless otherwise authorized under Section 121.213,
the data set forth in sections 3 through 34 of
this appendix, as correlated to the C-46 nontransport category airplane, is the minimum
means of compliance with the special airworthiness requirements of SectionSection 121.215 through
121.281.
3. Susceptibility of material to fire. [Deleted
as unnecessary]
4. Cabin interiors. C-46 crew compartments
must meet all the requirements of Section 121.215,
and, as required in Section 121.221, the door between
the crew compartment and main cabin
(cargo) compartment must be flame resistant.
5. Internal doors. Internal doors, including
the crew to main cabin door, must meet all
the requirements of Section 121.217.
6. Ventilation. Standard C-46 crew compartments meet the ventilation requirements of
Section 121.219 if a means of ventilation for control-

ling the flow of air is available between the
crew compartment and main cabin. The ventilation requirement may be met by use of a
door between the crew compartment and
main cabin. The door need not have louvers
installed; however, if louvers are installed,
they must be controllable.
7. Fire precautions. Compliance is required
with all the provisions of Section 121.221.
(a) In establishing compliance with this
section, the C-46 main cabin is considered as
a Class A compartment if - 
(1) The operator utilizes a standard system
of cargo loading and tiedown that allows
easy access in flight to all cargo in such
compartment, and, such system is included
in the appropriate portion of the operator-s
manual; and
(2) A cargo barrier is installed in the forward end of the main cabin cargo compartment. The barrier must - 
(i) Establish the most forward location beyond which cargo cannot be carried;
(ii) Protect the components and systems of
the airplane that are essential to its safe operation from cargo damage; and
(iii) Permit easy access, in flight, to cargo
in the main cabin cargo compartment.
The barrier may be a cargo net or a network
of steel cables or other means acceptable to
the Administrator which would provide
equivalent protection to that of a cargo net.
The barrier need not meet crash load requirements of FAR Section 25.561; however, it must
be attached to the cargo retention fittings
and provide the degree of cargo retention
that is required by the operators- standard
system of cargo loading and tiedown.
(b) C-46 forward and aft baggage compartments must meet, as a minimum, Class B requirements of this section or be placarded in
a manner to preclude their use as cargo or
baggage compartments.
8. Proof of compliance. The demonstration
of compliance required by Section 121.223 is not required for C-46 airplanes in which - 
(1) The main cabin conforms to Class A
cargo compartment requirements of Section 121.219;
and
(2) Forward and aft baggage compartments
conform to Class B requirements of Section 121.221,
or are placarded to preclude their use as
cargo or baggage compartments.
9. Propeller deicing fluid. No change from
the requirements of Section 121.225. Isopropyl alcohol is a combustible fluid within the meaning of this section.
10. Pressure cross-feed arrangements, location
of fuel tanks, and fuel system lines and fittings.
C-46 fuel systems which conform to all applicable Curtiss design specifications and which

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