Aircraft Fuels

Question 1

1. What is the purpose of a fuel dump system?

Answer 1

Emergency system that dumps fuel to bring aircraft weight down to maximum landing weight to land shortly after takeoff

Question 2

2. Other than reducing weight, what other function can be accomplished with a fuel jettisoning system?

Answer 2

A heavy wing can dumb fuel to maintain stability

Question 3

3. What are a few types of fuel cells?

Answer 3

Bladder fuel cells
Integral fuel cells
Integral fuel tanks
Welded or riveted

Question 4

4. How is the weight of a bladder type cell supported?

Answer 4

Structure of the cavity that the bladder sits in

Question 5

5. What is “wet-wing” construction?

Answer 5

Built into the aircraft also known as integral fuel cells

Question 6

6. What markings must be placed near the fuel filler opening on reciprocating engine aircraft?

Answer 6

Word “AVGAS” and minimum fuel grade

Question 7

7. What are the advantages of a single point pressure fueling system and what is it sometimes called?

Answer 7

Called single point, which greatly reduces time required to service large aircraft. reduces fuel contamination

Question 8

8. After fueling an aircraft, why is it important for a technician to wait at least 30 minutes prior to takin a fuel sample?

Answer 8

Contamination to settle into the sumps

Question 9

9. Why should the fuel sumps of aircraft be drained before the first flight of the day?

Answer 9

Remove any water

Question 10

10. What does water look like when in fuel that has been drained from the sumps?

Answer 10

Clear balls of jelly

Question 11

11. What is the purpose of a fuel temperature indicator on a turbine engine?

Answer 11

Checks fuel temperature to indicated danger of ice crystals forming in fuel

Question 12

12. What is the purpose of warning lights in connection with fuel systems?

Answer 12

Indicates fuel pressure is too low
Indicated fuel quantity is below a certain level

Question 13

13. Where are electrically operated valve in transit indicator lights used?

Answer 13

Large multi-engine aircraft cross feed & line valves may have in transit lights.

Question 14

14. Why do fuel selectors have detects?

Answer 14

“Locks” switch into selected position to ensure in proper location

Question 15

15. What are four general types of fuel quantity gauges?

Answer 15

Sigh glass
Mechanical
Electrical
Electronic

Question 16

16. Which type of fuel quantity gauge is more accurate than other types?

Answer 16

Electronic-capacitance type measures weight

Question 17

17. Describe the sensor used in an electronic type fuel quantity indicating system.

Answer 17

Tubular capacitor extending top to bottom of tank

Question 18

18. What is a drip gauge?

Answer 18

Under wing bayonet fuel gauge.

Question 19

19. What is a cross feed system?

Answer 19

Interconnected fuel system to transfer fuel from and two any tank to any engine

Question 20

20. What is the purpose of the baffles in a fuel tank?

Answer 20

Prevent fuel from surging due to changes in altitude

Question 21

21. How can a fuel tank be checked for leaks after a repair?

Answer 21

Pressure check using air & soap

Question 22

22. What is another name for a pressure type refueling system?

Answer 22

Single point refueling system

Question 23

23. What is the purpose of a jettisoning system on a small aircraft?

Answer 23

Obtain safe landing weight