Learjet 25B - Fuel System

5-i
CHAPTER 5
FUEL SYSTEM
CONTENTS
Page
INTRODUCTION ................................................................................................................... 5-1
GENERAL............................................................................................................................... 5-1
FUEL TANKS AND TANK VENTING SYSTEM ................................................................ 5-3
General ............................................................................................................................. 5-3
Tip Tanks.......................................................................................................................... 5-3
Wing Tanks ...................................................................................................................... 5-3
Fuselage Tank .................................................................................................................. 5-3
Ram-Air Vent System ...................................................................................................... 5-4
FUEL INDICATING SYSTEMS ............................................................................................ 5-4
Fuel Quantity Indicating System/Low Fuel Warning ...................................................... 5-4
Fuel Flow Indicating System ........................................................................................... 5-7
FUEL DISTRIBUTION .......................................................................................................... 5-8
General ............................................................................................................................. 5-8
Boost Pumps .................................................................................................................... 5-8
Motive-Flow Fuel and Jet Pumps .................................................................................... 5-8
Filters ............................................................................................................................... 5-9
Main Fuel Shutoff Valves ................................................................................................ 5-9
Low Fuel Pressure Warning Lights.................................................................................. 5-9
Pressure-Relief Valves ................................................................................................... 5-10
Fuel Drain Valves........................................................................................................... 5-10
FOR TRAINING PURPOSES ONLY
LEARJET 20 SERIES PILOT TRAINING MANUAL
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