UH 72 - STUDY GUIDE

Question 1

How many fuel tanks does the helicopter have ?

Answer 1

2 Main tanks
1 Separated supply tank
with overflow to main tank

Question 2

What engines does the UH72 have ?

How many horsepower do they supply ?

Answer 2

2 Turbomeca Arriel 1 E2 engines

760 shp each

Question 3

What type of power consumers are connected to the:
Essential buses

Answer 3

1. Consumers with low energy demand
2. Consumers that are vital under emergency conditions

Question 4

What type of power consumers are connected to the:
Shedding buses

Answer 4

1. DC power consumers

Question 5

Which buses are not supplied with power in case of 2xGEN failure ?

Answer 5

The shedding buses

Question 6

What supplies the OH panel with power ?

Answer 6

Mainbus 1+2
or
Battery bus

Question 7

What supply the shedding buses with power ?

Answer 7

Main bus 1+2

Question 8

What supply the essential buses with power ?

Answer 8

Battery bus

Question 9

What does the single bus bar for AC voltage, supply ?

Answer 9

Weather radar, mechanical gyros…

Question 10

What position is the EMER SHD BUS in by default ?

And what does this position mean ?

Answer 10

NORM:

The shedding buses are powered if supplied by a minimum of 1 GEN or the EPU

Question 11

What happens if the EMER SHD BUS switch is turned to the “on” position ?

Answer 11

The shedding buses gets supplied by the battery

( in case of 2 x GEN failure )

Question 12

What does the three positions, of the BUS TIE 1+2 switch, do ?

Answer 12

NORM: Connect battery bus to main busses

OFF: Separates the two main buses

RES: Resets functions when the two main buses has been separated by a fault or protective measure

Question 13

What is the purpose of “VENT ENGINE 1+2”?

Answer 13

When switched to ON engines begins to turn for ventilation

Question 14

What is the purpose of “TRAIN ENGINE 1+2” ?

Answer 14

Arming the respective single engine training mode.

Allows for single engine training without reaching or exciting max single engine power

Question 15

How can you reset the “gong” ?

Answer 15

RESET button on cyclic stick

or

SELECT key on the CAD

Question 16

W/U : what does EXT indicate ?

Answer 16

Bottle discharge activation

Question 17

W/U : When will the “Master caution” illuminate ?

Answer 17

With each caution message on the CAD

Question 18

W/U : When will the “Master caution” extinguish for the panel ?

Answer 18

Depressing the RESET button on the cyclic

and activated again with the next caution

Question 19

W/U : When will the fire light illuminate ?

Answer 19

If a fire is detected in the respective engine compartment

(Engine 1 or 2)

Question 20

W/U : What does “BOT 1+2” indicate ?

Answer 20

Availability of fire extinguisher bottles

Question 21

W/U : What does “LOW FUEL1+2” indicate ?

What is standard reaction ?

Answer 21

Supply tank 1+2

approx 24 kg (53lbs) fuel remaining in respective fuel tank.

Landing within 10 minutes

Question 22

W/U : What does “ENG 1+2 FAIL” indicate?

Answer 22

Respective N1 RPM below 50%

Question 23

W/U : What does “ROTOR RPM” indicate?

What sounds follow

Answer 23

Nro = Rotor speed warning
________

LOW 95% = beeping “pulsed tone”

HIGH 106% = gong

110% = High pitch audio “tone”

Question 24

W/U : What sound is the fire warning and then will it not sound ?

Answer 24

Warning bell

Will not sound when it happens simultaneously with a RPM warning. Only the RPM warning will sound.

Question 25

W/U : What does “XMSN OILP” indicate ?

Answer 25

Main transmission oil pressure warning

Oil pressure below 1.0 bar

Question 26

W/U : What does “AP” indicate ?

(Sound?)

Answer 26

Auto pilot warning

(with gong)

Question 27

W/U : What does “BAT TEMP” indicate ?

Answer 27

Battery temperature above 70*C

Question 28

How are the signals from the cyclic and the collective transmitted ?

Answer 28

The signals are transmitted to 3 ball bearing control cables (flexballs)

Question 29

Where does the signals from the controls get force amplified ?

(Where is it located ?)

Answer 29

Hydraulic boost unit

(under the roof)

Question 30

Where are the amplified signals from the boost unit transmitted to ?

Answer 30

The mixing lever assembly

Question 31

What effect does the signals from the cyclic stick have on the swash plate ?

Answer 31

Tilts the swash plate

Question 32

What moves the sliding sleeve up or down ?

Answer 32

Collective input signals

Question 33

What does “turbo shaft engine” mean ?

(What runs the rotor
How does the blades turn)

Answer 33

That the engine is powered by “Shaft power”.

(Turbine blades turns the shaft which run (turns) the rotor.
The blades absorbs hot and high pressure gas flowing over them - airfoil design makes them turn.)