PPC

Question 1

How is MTA effected by bleed air?

Answer 1

Engine Anti-ice- 20% off the top
Cockpit/Gunner heat- 5% off the top

Question 2

Will you see the MTA in the cockpit if you have two seperate ETF’s?

Answer 2

No, each engine will go to its respective MTA

Question 3

If you are hovering at GO/NOGO Q in IGE, what Q will you pull OGE?

Answer 3

MTA

Question 4

How much weight is equivilent to 1% Q?

Answer 4

200lbs

Question 5

What is the difference between max rate of climb and max endurance?

Answer 5

Max rate of climb is corrected for >1400fpm climbs

Question 6

When is Max allowable GWT a structural or environmental limit?

Answer 6

It is an enviromental limit when it is <22000lbs

Question 7

What is gross weight?

Answer 7

Gross weight is the total weight of the helicopter and all its contents

Question 8

When would you use max range airspeed?

Answer 8

To produce the greatest flying range with the minimum amount of fuel

Question 9

What is ATF?

Answer 9

Aircraft Torque Factor
Average of the two seperate ETF’s
Ranges from 0.90-1.00

Question 10

What does single engine indicated airspeed represent?

Answer 10

The upper and lower limit for single engine straight and level flight at 2.5 min contingency power.

Question 11

When is MTA a structural limit vs an environmental?

Answer 11

MTA is a structural limit when in coincides with Q limitations, environmental when its lower than Q limitations

Question 12

Why is MTA higher at cruise than at a hover?

Answer 12

RAM air cooling the engine

Question 13

What is ETF?

Answer 13

Engine Torque Factor
The performance of an engine at 35degC
Ranges from 0.85 to 1.0

Question 14

How does beed air effect cruise fuel flow?

Answer 14

Engine Anti-ice -100lbs/hr
Heater- 20lbs/hr
Heater & AUX- 30 lbs/hr

Question 15

What values must be read when doing dynamic in flight performance?

Answer 15

MTA
Max allowable GWT OGE
Q required to hover at max GWT IGE/OGE
Aircraft GWT

Question 16

What is critical Torque?

Answer 16

The torque that if you are pulling above and you have an engine failure, you will be unable to maintain straight and level flight

Question 17

What does max angle coincide with?

Answer 17

Retreating blade stall

Question 18

When would you use max endurance airspeed?

Answer 18

Whenever you want to remain airborne for the longest duration possible
Least amount of drag effecting the aircraft

Question 19

What is min/max airspeed?

Answer 19

The minimum and maximum airspeed that you are able to maintain straight and level flight at MTA

Question 20

When does a PPC need to be recomputed?

Answer 20

Increase of 500lbs
Increase of 5degC
Increase of 1000’PA
Change in +/- 0.05ETF

Question 21

What is operating weight?

Answer 21

Basic weight + crew and required equipment

Question 22

What happens if you pull over the MTA?

Answer 22

You droop the rotor

Question 23

What is torque ratio?

Answer 23

ATF/ETF corrected for planned temperature (the actual performance of the engine)

Question 24

What hapens if you exceed VNE?

Answer 24

You can get into retreating blade stall, as well as cause damage to the aircraft.

Question 25

What is basic weight?

Answer 25

The weight of the aircraft with hydraulic/oil systems full, trapped fuel, and mounted equiptment.

Question 26

What is max continous torque?

Answer 26

The torque that you are able to continuously pull without entering 30 min TGT limitations

Question 27

What can cause an innacurate predicted hover torque?

Answer 27

Environmental conditions Ground surface Inaccurate computation Aircraft is heavier or lighter than predicted

Question 28

What is MTA?

Answer 28

Max Torque Available The amount of torque the engines are capable of producing without exceeding TGT limits and drooping the rotor.

Question 29

When must dynamic in flight updates be made?

Answer 29

With the intent to take off or land within 3,000lbs of max allowable GWT Increase of 5degC Increase of 1000'PA