XI. FUEL LIMITATIONS

Question 1

52. What are approved engine fuels?

Answer 1

1. Jet A, Jet A-1, Jet B.

2. JP-4, JP-5, JP-8.

Question 2

53. What are the approved emergency fuels?

Answer 2

COMMERCIAL AVIATION GASOLINE GRADES: 
80 Red; 
91/96; 100 Green; 
10OLL Blue;
115/145 Purple.

Question 3

54. How long can the engine be operated on aviation gasoline?

Answer 3

Operation is limited to 150 hours between engine overhauls;

Operation is prohibited if either of
the standby fuel pumps is inoperative;

Crossfeed capability is required for flight above 20,000 feet pressure altitude (FL200).

Question 4

APPROVED FUEL ADDITIVES

55. What anti-icing additives are approved for use?

Answer 4

Anti-icing additive conforming to

MIL-1-27686 or MIL-1-85470 may be used.

Question 5

FUEL BIOCIDE ADDITIVES

56. What concentration of biocide can be used in the fuel?

Answer 5

Fuel biocide-fungicide “BIOBOR JF” in concentrations of 135 ppm or 270 ppm may be used in the fuel.

Question 6

57. What is the total usable fuel quantity?

Answer 6

539 gallons (3611 pounds)

Question 7

58. How much fuel does each main tank hold?

Answer 7

190 gallon (1273 pounds)

Question 8

59. How much fuel does each auxiliary tank hold?

Answer 8

79.5 gallons (533 pounds)

Question 9

FUEL IMBALANCE

60. What is the maximum fuel imbalance?

Answer 9

Maximum allowable fuel imbalance between wing fuel systems is 300 pounds.

Question 10

61. When is fuel crossfeed operation authorized?

Answer 10

Crossfeeding of fuel is permitted only when one engine is inoperative.

Question 11

62. How many standby fuel pumps are required for takeoff?

Answer 11

One operative standby fuel pump is required for takeoff when using approved engine fuels,

but in such a case, crossfeed of fuel will not be available from the side of the inoperative standby fuel pump.

Question 12

63. How many fuel pumps must be operational when operating on avgas?

Answer 12

Two operative standby fuel pumps are required for takeoff when operating on emergency engine fuels.

Question 13

FUEL GAGES IN THE YELLOW ARC

64. What does the yellow arc represent?

Answer 13

Do not take off if fuel quantity gages indicate in yellow arc or indicate less than 265 pounds (120 kg) of
fuel in each wing system.

Question 14

AUXILIARY FUEL

65. When can you fill the auxiliary tanks?

Answer 14

Do not put any fuel into the auxiliary tanks unless the main tanks are full.

Question 15

OPERATING WITH LOW FUEL PRESSURE

66. What is the time limit for operating with the low fuel pressure annunciator light illuminated?

Answer 15

The high pressure engine driven fuel pump can be operated for 10 hours before overhaul or replacement.