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197 

Federal Aviation Administration, DOT 

Pt. 25 

O

IL

S

YSTEM

 

25.1011

General. 

25.1013

Oil tanks. 

25.1015

Oil tank tests. 

25.1017

Oil lines and fittings. 

25.1019

Oil strainer or filter. 

25.1021

Oil system drains. 

25.1023

Oil radiators. 

25.1025

Oil valves. 

25.1027

Propeller feathering system. 

C

OOLING

 

25.1041

General. 

25.1043

Cooling tests. 

25.1045

Cooling test procedures. 

I

NDUCTION

S

YSTEM

 

25.1091

Air induction. 

25.1093

Induction system icing protection. 

25.1101

Carburetor air preheater design. 

25.1103

Induction system ducts and air duct 

systems. 

25.1105

Induction system screens. 

25.1107

Inter-coolers and after-coolers. 

E

XHAUST

S

YSTEM

 

25.1121

General. 

25.1123

Exhaust piping. 

25.1125

Exhaust heat exchangers. 

25.1127

Exhaust driven turbo-superchargers. 

P

OWERPLANT

C

ONTROLS AND

A

CCESSORIES

 

25.1141

Powerplant controls: general. 

25.1142

Auxiliary power unit controls. 

25.1143

Engine controls. 

25.1145

Ignition switches. 

25.1147

Mixture controls. 

25.1149

Propeller speed and pitch controls. 

25.1153

Propeller feathering controls. 

25.1155

Reverse thrust and propeller pitch 

settings below the flight regime. 

25.1157

Carburetor air temperature controls. 

25.1159

Supercharger controls. 

25.1161

Fuel jettisoning system controls. 

25.1163

Powerplant accessories. 

25.1165

Engine ignition systems. 

25.1167

Accessory gearboxes. 

P

OWERPLANT

F

IRE

P

ROTECTION

 

25.1181

Designated fire zones; regions in-

cluded. 

25.1182

Nacelle areas behind firewalls, and 

engine pod attaching structures con-
taining flammable fluid lines. 

25.1183

Flammable fluid-carrying compo-

nents. 

25.1185

Flammable fluids. 

25.1187

Drainage and ventilation of fire 

zones. 

25.1189

Shutoff means. 

25.1191

Firewalls. 

25.1192

Engine accessory section diaphragm. 

25.1193

Cowling and nacelle skin. 

25.1195

Fire extinguishing systems. 

25.1197

Fire extinguishing agents. 

25.1199

Extinguishing agent containers. 

25.1201

Fire extinguishing system materials. 

25.1203

Fire detector system. 

25.1207

Compliance. 

Subpart F—Equipment 

G

ENERAL

 

25.1301

Function and installation. 

25.1302

Installed systems and equipment for 

use by the flightcrew. 

25.1303

Flight and navigation instruments. 

25.1305

Powerplant instruments. 

25.1307

Miscellaneous equipment. 

25.1309

Equipment, systems, and installa-

tions. 

25.1310

Power source capacity and distribu-

tion. 

25.1316

Electrical and electronic system 

lightning protection. 

25.1317

High-intensity Radiated Fields 

(HIRF) Protection. 

I

NSTRUMENTS

: I

NSTALLATION

 

25.1321

Arrangement and visibility. 

25.1322

Flightcrew alerting. 

25.1323

Airspeed indicating system. 

25.1324

Angle of attack system. 

25.1325

Static pressure systems. 

25.1326

Pitot heat indication systems. 

25.1327

Magnetic direction indicator. 

25.1329

Flight guidance system. 

25.1331

Instruments using a power supply. 

25.1333

Instrument systems. 

25.1337

Powerplant instruments. 

E

LECTRICAL

S

YSTEMS AND

E

QUIPMENT

 

25.1351

General. 

25.1353

Electrical equipment and installa-

tions. 

25.1355

Distribution system. 

25.1357

Circuit protective devices. 

25.1360

Precautions against injury. 

25.1362

Electrical supplies for emergency 

conditions. 

25.1363

Electrical system tests. 

25.1365

Electrical appliances, motors, and 

transformers. 

L

IGHTS

 

25.1381

Instrument lights. 

25.1383

Landing lights. 

25.1385

Position light system installation. 

25.1387

Position light system dihedral an-

gles. 

25.1389

Position light distribution and in-

tensities. 

25.1391

Minimum intensities in the hori-

zontal plane of forward and rear position 
lights. 

25.1393

Minimum intensities in any vertical 

plane of forward and rear position lights. 

25.1395

Maximum intensities in overlapping 

beams of forward and rear position 
lights. 

25.1397

Color specifications. 

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