Federal Aviation Administration, DOT

Pt. 121, App. C

comply with the FAA type certification requirements are in compliance with the provisions of SectionSection 121.227 through 121.231.
11. Fuel lines and fittings in designated fire
zones. No change from the requirements of
Section 121.233.
12. Fuel valves. Compliance is required with
all the provisions of Section 121.235. Compliance can
be established by showing that the fuel system conforms to all the applicable Curtiss
design specifications, the FAA type certification requirements, and, in addition, has
explosion-proof fuel booster pump electrical
selector switches installed in lieu of the open
contact type used originally.
13. Oil lines and fittings in designated fire
zones. No change from the requirements of
Section 121.237.
14. Oil valves. C-46 oil shutoff valves must
conform to the requirements of Section 121.239. In
addition, C-46 airplanes using Hamilton
Standard propellers must provide, by use of
stand pipes in the engine oil tanks or other
approved means, a positive source of oil for
feathering each propeller.
15. Oil system drains. The standard C-46  - Y - 
drains installed in the main oil inlet line for
each engine meet the requirements of
Section 121.241.
16. Engine breather line. The standard C-46
engine breather line installation meets the
requirements of Section 121.243 if the lower breather
lines actually extend to the trailing edge of
the oil cooler air exit duct.
17. Firewalls and firewall construction. Compliance is required with all of the provisions
of SectionSection 121.245 and 121.247. The following requirements must be met in showing compliance with these sections:
(a) Engine compartment. The engine firewalls of the C-46 airplane must - 
(1) Conform to type design, and all applicable airworthiness directives;
(2) Be constructed of stainless steel or approved equivalent; and
(3) Have fireproof shields over the fairleads
used for the engine control cables that pass
through each firewall.
(b) Combustion heater compartment. C-46 airplanes must have a combustion heater fire
extinguishing system which complies with
AD-49-18-1 or an FAA approved equivalent.
18. Cowling. Standard C-46 engine cowling
(cowling of aluminum construction employing stainless steel exhaust shrouds) which
conforms to the type design and cowling configurations which conform to the C-46 transport category requirements meet the requirements of Section 121.249.
19. Engine accessory section diaphragm. C-46
engine nacelles which conform to the C-46
transport category requirements meet the
requirements of Section 121.251. As provided for in
that section, a means of equivalent protection which does not require provision of a diaphragm to isolate the engine power section
and exhaust system from the engine acces-

sory compartment is the designation of the
entire engine compartment forward of and
including the firewall as a designated fire
zone, and the installation of adequate fire
detection and fire extinguishing systems
which meet the requirements of Section 121.263 and
Section 121.273, respectively, in such zone.
20. Powerplant fire protection. C-46 engine
compartments and combustion heater compartments are considered as designated fire
zones within the meaning of Section 121.253.
21. Flammable fluids - 
(a) Engine compartment. C-46 engine compartments which conform to the type design
and which comply with all applicable airworthiness directives meet the requirements
of Section 121.255.
(b) Combustion heater compartment. C-46
combustion heater compartments which conform to type design and which meet all the
requirements of AD-49-18-1 or an FAA approved equivalent meet the requirements of
Section 121.255.
22. Shutoff means - 
(a) Engine compartment. C-46 engine compartments which comply with AD-62-10-2 or
FAA approved equivalent meet the requirements of Section 121.257 applicable to engine compartments, if, in addition, a means satisfactory to the Administrator is provided to shut
off the flow of hydraulic fluid to the cowl
flap cylinder in each engine nacelle. The
shutoff means must be located aft of the engine firewall. The operator-s manual must
include, in the emergency portion, adequate
instructions for proper operation of the additional shutoff means to assure correct sequential positioning of engine cowl flaps
under emergency conditions. In accordance
with Section 121.315, this positioning must also be
incorporated in the emergency section of the
pilot-s checklist.
(b) Combustion heater compartment. C-46
heater compartments which comply with
paragraph (5) of AD-49-18-1 or FAA approved
equivalent meet the requirements of Section 121.257
applicable to heater compartments if, in addition, a shutoff valve located above the
main cabin floor level is installed in the alcohol supply line or lines between the alcohol supply tank and those alcohol pumps located under the main cabin floor. If all of the
alcohol pumps are located above the main
cabin floor, the alcohol shutoff valve need
not be installed. In complying with paragraph (5) of AD-49-18-1, a fail-safe electric
fuel shutoff valve may be used in lieu of the
manually operated valve.
23. Lines and fittings - (a) Engine compartment. C-46 engine compartments which comply with all applicable airworthiness directives, including AD-62-10-2, by using FAA
approved fire-resistant lines, hoses, and end
fittings, and engine compartments which
meet the C-46 transport category requirements, meet the requirements of Section 121.259.

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