PPC/Power Management

Question 1

What is ETF and what is the allowable range?

Answer 1

The ratio of an individual engine torque available to specification torque at the reference temperature of 35*C

.85-1.0

Question 2

What is the ATF and what is the allowable?

Answer 2

The ratio of an aircrafts power to a specific power reference at a temperature of 35*C. This is the average of both ETFs

.90-1.0

Question 3

What is torque ratio?

Answer 3

The amount of torque available to a specification torque at an ambient temperature.

Question 4

What are the four sections of the PPC?

Answer 4

Departure, arrival, cruise, remarks

Question 5

What conditions do you need to complete the arrival portion?

Answer 5

Increase in 5*C, 1,000’ PA, or 500lbs

Question 6

What is maximum torque available?

Answer 6

Max amount of torque an engine can produce at 100% R RPM at a given PA and FAT

Question 7

What is the 2.5 min limit also referred too as?

Answer 7

Contingency power

Question 8

What is max allowable gross weight?

Answer 8

Max weight that an aircraft can weigh at a 10’ hover IGE or 70’ hover OGE

If the weight is 22,000 this is a structural limitation. If it’s less than that, it’s an engine limitation

Question 9

What is the Go/No go Torque?

Answer 9

This helps to verify if an aircraft is at or below maximum weight IGE or OGE

Question 10

When must maximum hover height be calculated?

Answer 10

When aircraft gross weight exceeds max allowable gross weight OGE and power not available for OGE hover.

If OGE does exist, put OGE in max hover heigh box

Question 11

What is predicted hover torque?

Answer 11

Estimated torque required for a stationary hover using takeoff gross weight with current PA and FAT

Question 12

What is the predicted single engine hover torque?

Answer 12

Estimated torque required for a stationary hover using takeoff gross eight with current PA and FAT

Double the dual engine to get a quick estimate for SE

Question 13

What two items in the departure chart are calculated using current conditions?

Answer 13

GO/NO GO Torque and predicted hover torque

Question 14

What is continuous torque?

Answer 14

A power level the engine can produce continuously and remain out of time limited engine operating limitations

Also referred to as Maximum Continuous Power

Question 15

What is max range IAS?

Answer 15

This gives you the greatest flight range per pound of fuel

Question 16

What is max endurance IAS?

Answer 16

This allows the most time aloft

Question 17

What is critical torque?

Answer 17

If this torque value is exceeded, the aircraft may not be able to maintain % RPM R within normal limits under single engine operations

Question 18

What is the Optimum IAS at Max Allowable GWT?

Answer 18

Airspeed that must be flown in order to maintain level flight at max allowable GWT

Question 19

What is Max R/C IAS?

Answer 19

Adjusted indicated airspeed that allows for the fastest climb using max torque

Question 20

What is the airspeed correction chart?

Answer 20

Used to address the IAS errors resulting from disturbed airflow in and around the pitot tubes while climbing