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62 

14 CFR Ch. I (1–1–19 Edition) 

Pt. 121 

121.107

Dispatch centers. 

Subpart F—Approval of Areas and Routes 

for Supplemental Operations 

121.111

Applicability. 

121.113

Area and route requirements: Gen-

eral. 

121.115

Route width. 

121.117

Airports: Required data. 

121.119

Weather reporting facilities. 

121.121

En route navigation facilities. 

121.122

Communications facilities—supple-

mental operations. 

121.123

Servicing maintenance facilities. 

121.125

Flight following system. 

121.127

Flight following system; require-

ments. 

Subpart G—Manual Requirements 

121.131

Applicability. 

121.133

Preparation. 

121.135

Manual contents. 

121.137

Distribution and availability. 

121.139

Requirements for manual aboard air-

craft: Supplemental operations. 

121.141

Airplane flight manual. 

Subpart H—Aircraft Requirements 

121.151

Applicability. 

121.153

Aircraft requirements: General. 

121.155

[Reserved] 

121.157

Aircraft certification and equipment 

requirements. 

121.159

Single-engine airplanes prohibited. 

121.161

Airplane limitations: Type of route. 

121.162

ETOPS Type Design Approval Basis. 

121.163

Aircraft proving tests. 

Subpart I—Airplane Performance 

Operating Limitations 

121.171

Applicability. 

121.173

General. 

121.175

Airplanes: Reciprocating engine- 

powered: Weight limitations. 

121.177

Airplanes: Reciprocating engine- 

powered: Takeoff limitations. 

121.179

Airplanes: Reciprocating engine- 

powered: En route limitations: All en-
gines operating. 

121.181

Airplanes: Reciprocating engine- 

powered: En route limitations: One en-
gine inoperative. 

121.183

Part 25 airplanes with four or more 

engines: Reciprocating engine powered: 
En route limitations: Two engines inop-
erative. 

121.185

Airplanes: Reciprocating engine- 

powered: Landing limitations: Destina-
tion airport. 

121.187

Airplanes: Reciprocating engine- 

powered: Landing limitations: Alternate 
airport. 

121.189

Airplanes: Turbine engine powered: 

Takeoff limitations. 

121.191

Airplanes: Turbine engine powered: 

En route limitations: One engine inoper-
ative. 

121.193

Airplanes: Turbine engine powered: 

En route limitations: Two engines inop-
erative. 

121.195

Airplanes: Turbine engine powered: 

Landing limitations: Destination air-
ports. 

121.197

Airplanes: Turbine engine powered: 

Landing limitations: Alternate airports. 

121.198

Cargo service airplanes: Increased 

zero fuel and landing weights. 

121.199

Nontransport category airplanes: 

Takeoff limitations. 

121.201

Nontransport category airplanes: En 

route limitations: One engine inoper-
ative. 

121.203

Nontransport category airplanes: 

Landing limitations: Destination airport. 

121.205

Nontransport category airplanes: 

Landing limitations: Alternate airport. 

121.207

Provisionally certificated airplanes: 

Operating limitations. 

Subpart J—Special Airworthiness 

Requirements 

121.211

Applicability. 

121.213

[Reserved] 

121.215

Cabin interiors. 

121.217

Internal doors. 

121.219

Ventilation. 

121.221

Fire precautions. 

121.223

Proof of compliance with § 121.221. 

121.225

Propeller deicing fluid. 

121.227

Pressure cross-feed arrangements. 

121.229

Location of fuel tanks. 

121.231

Fuel system lines and fittings. 

121.233

Fuel lines and fittings in designated 

fire zones. 

121.235

Fuel valves. 

121.237

Oil lines and fittings in designated 

fire zones. 

121.239

Oil valves. 

121.241

Oil system drains. 

121.243

Engine breather lines. 

121.245

Fire walls. 

121.247

Fire-wall construction. 

121.249

Cowling. 

121.251

Engine accessory section diaphragm. 

121.253

Powerplant fire protection. 

121.255

Flammable fluids. 

121.257

Shutoff means. 

121.259

Lines and fittings. 

121.261

Vent and drain lines. 

121.263

Fire-extinguishing systems. 

121.265

Fire-extinguishing agents. 

121.267

Extinguishing agent container pres-

sure relief. 

121.269

Extinguishing agent container com-

partment temperature. 

121.271

Fire-extinguishing system mate-

rials. 

121.273

Fire-detector systems. 

121.275

Fire detectors. 

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