Aircraft Fuel Systems

Question 1

What is the purpose of a fuel jettisoning system ?

Answer 1

Reduce weight of aircraft for landing

Question 2

What is the purpose of a fuel tank internal baffles ?

Answer 2

Resist fuel surging caused by changes in altitude

Question 3

Why should you wait a period of time after fueling before checking fuels sumps ?

Answer 3

Allow time for water and sediment to settle at drain point

Question 4

What are two types of fuel tank cells ?

Answer 4

Bladder type, Integral tanks

Question 5

What supports the weight of fuel in a bladder type fuel cell ?

Answer 5

The structure of the cavity that the cell fits into

Question 6

What is wet wing type construction ?

Answer 6

Integral fuel tanks

Question 7

What indications could be used to determine when there may be danger of ice crystals forming in the fuel of a turbine powered aircraft ?

Answer 7

Fuel temperature or a differential pressure type indicators

Question 8

What are four types of fuel quantity gauges in use today ?

Answer 8

Sight glass, mechanical, electrical, electronic

Question 9

What is an electrical operated fuel tank shutoff valve transit light ?

Answer 9

A light that indicates when the valve is in motion

Question 10

What should be done with old gaskets and seals when replacing fuel systems, components ?

Answer 10

Removed and replaced by new ones

Question 11

What method may be used to check a fuel tank for leaks after a weld has been performed ?

Answer 11

The tank is pressurized with 1/2 to 3 psi air pressure and a soapy solution is added to detect any leaks

Question 12

When would a fuel jettison system be required for small aircraft ?

Answer 12

Required when the maximum takeoff weight exceeds the maximum landing weight

Question 13

What are some other names for a single point fueling system ?

Answer 13

An under wing or pressure fueling system

Question 14

Why do multi engine airplanes have fuel crossed systems ?

Answer 14

To allow the engine to be feed by any tank

Question 15

The fuel selector valve for multi engine aircraft must have at least three positions ?

Answer 15

On, Off, Crossfed

Question 16

Why are electronic (capacitance type) fuel quantity systems more accurate than other types ?

Answer 16

They measure the MASS instead of volume

Question 17

For what reason is a fuel jettison system usually divided into two separate, independent systems, one for each wing ?

Answer 17

To help maintain lateral stability by jettison fuel from a heavy wing if necessary

Question 18

What are drip and sight gauges ?

Answer 18

Underwing bayonet type fuel guages

Question 19

Is it possible for a fuel system to develop a leak that has no visible evidence such as a stain or spot, and if so how ?

Answer 19

An internal component such as a valve could develop a leak

Question 20

Name some advantages of a single point fueling system ?

Answer 20

It reduces fueling time, reduces chances for contamination, fire, and eliminates damage to the aircraft skin