93 Fuel Management 1

Question 1

Cruise control definition

Answer 1

The organized control of an aircraft in flight to obtain maximum flight profile efficiency

Question 2

Cruise control advantages

Answer 2

General increase in safety and efficiency during individual flights
Conservation of fuel on ferry flights
Optimize payloads on transport operations
Saving on fuel in long range tactical flights where the time spent in actual combat is small in relation to time spent cruising to and from target
Efficient fuel conservation on long range flights where maximum range is required
Controls may be adjusted properly in flight to meet any changes in predicted conditions (W/V, ramp time, ease of operation)

Question 3

Cruise controls factors

Answer 3

Distance
Wind component
Temperature deviation
Fuel capacity
Payload to be carried
Amount of fuel reserve required
Max allowable all-up weight at T/O and landing
Enroute weather
ATC restrictions
Fuel availability at departure and destination

Question 4

SFC definition

Answer 4

Specific Fuel Consumption: is a measure of the efficiency of an engine. The comparison of the amount of fuel used to the amount of thrust produced. The lower the SFC the better since the aim is to obtain the maximum amount of thrust from fuel used.
SFC = FF/ESHP (effective shaft horsepower)

Question 5

Four variables affecting SFC

Answer 5

Engine RMP
OAT
Altitude
IAS