259
Federal Aviation Administration, DOT
Pt. 121, App. C
comply with the FAA type certification re-
quirements are in compliance with the provi-
sions of §§ 121.227 through 121.231.
11.
Fuel lines and fittings in designated fire
zones.
No change from the requirements of
§ 121.233.
12.
Fuel valves.
Compliance is required with
all the provisions of § 121.235. Compliance can
be established by showing that the fuel sys-
tem conforms to all the applicable Curtiss
design specifications, the FAA type certifi-
cation 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
§ 121.237.
14.
Oil valves.
C–46 oil shutoff valves must
conform to the requirements of § 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
§ 121.241.
16.
Engine breather line.
The standard C–46
engine breather line installation meets the
requirements of § 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.
Com-
pliance is required with all of the provisions
of §§ 121.245 and 121.247. The following re-
quirements must be met in showing compli-
ance with these sections:
(a)
Engine compartment.
The engine fire-
walls of the C–46 airplane must—
(1) Conform to type design, and all applica-
ble airworthiness directives;
(2) Be constructed of stainless steel or ap-
proved 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 air-
planes 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 employ-
ing stainless steel exhaust shrouds) which
conforms to the type design and cowling con-
figurations which conform to the C–46 trans-
port category requirements meet the re-
quirements of § 121.249.
19.
Engine accessory section diaphragm.
C–46
engine nacelles which conform to the C–46
transport category requirements meet the
requirements of § 121.251. As provided for in
that section, a means of equivalent protec-
tion which does not require provision of a di-
aphragm 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 § 121.263 and
§ 121.273, respectively, in such zone.
20.
Powerplant fire protection.
C–46 engine
compartments and combustion heater com-
partments are considered as designated fire
zones within the meaning of § 121.253.
21.
Flammable fluids
—
(a)
Engine compartment.
C–46 engine com-
partments which conform to the type design
and which comply with all applicable air-
worthiness directives meet the requirements
of § 121.255.
(b)
Combustion heater compartment.
C–46
combustion heater compartments which con-
form to type design and which meet all the
requirements of AD–49–18–1 or an FAA ap-
proved equivalent meet the requirements of
§ 121.255.
22.
Shutoff means
—
(a)
Engine compartment.
C–46 engine com-
partments which comply with AD–62–10–2 or
FAA approved equivalent meet the require-
ments of § 121.257 applicable to engine com-
partments, if, in addition, a means satisfac-
tory 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 en-
gine firewall. The operator’s manual must
include, in the emergency portion, adequate
instructions for proper operation of the addi-
tional shutoff means to assure correct se-
quential positioning of engine cowl flaps
under emergency conditions. In accordance
with § 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 § 121.257
applicable to heater compartments if, in ad-
dition, a shutoff valve located above the
main cabin floor level is installed in the al-
cohol supply line or lines between the alco-
hol supply tank and those alcohol pumps lo-
cated 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 para-
graph (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 compart-
ment.
C–46 engine compartments which com-
ply with all applicable airworthiness direc-
tives, 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 require-
ments, meet the requirements of § 121.259.
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