Beech B90

Front 1

What type of engine doe the Beech 90 have?

Back 1

PT6A-20 550shp

Front 2

How many Axial and Centrifugal Compressor and in the PT6A-20 engine?

Back 2

3 Axial and 1 Centrifugal

Front 3

How many fuel nozzles are in the PT6A-20 engine?

Back 3

14 nozzles

Front 4

We're is the accessory section and oil tank situated on the PT6A-20 engine?

Back 4

Aft section

Front 5

How many positions does the Starter Ignition Switch have?

Back 5

3 Positions 'Ignition & Engine Start' + 'Stop' + ''Starter Only"

Front 6

When will the ignition activate when the auto ignition is armed?

Back 6

When engine torque drops below 400lbs

Front 7

What is the normal operating range for the propeller?

Back 7

1800RPM - 2200RPM

Front 8

How does the propeller feather?

Back 8

Manual movement of the propeller leaver to the feather position lifts the pilot valve to a position which dumps high pressure oil from the propeller hub.

Front 9

What is the minimum N1 for the LOW IDLE and HIGH IDLE condition leaver?

Back 9

LOW IDLE = 50% HIGH IDLE = 70%

Front 10

What is the position of the ITT temp sensor and were is this situated in the engine?

Back 10

T5 position and this is between the power and compressor turbines.

Front 11

What is the RPM for 100% N1?

Back 11

37,500RPM

Front 12

What is the engine oil capacity per engine and how much is usable?

Back 12

3.5 US GAL and 1.5 US GAL

Front 13

What operates the torquemeter and used to alter the propeller pitch?

Back 13

Engine oil.

Front 14

We're is the magnetic chip detector located on the engine?

Back 14

On the nose gearbox drain plug of each engine.

Front 15

What prevents ice freezing in the fuel?

Back 15

The oil to fuel heat exchanger.

Front 16

What protects the engines FCU pneumatic line?

Back 16

Heated jackets which are operated by the FUEL CONTROL HEAT switches.

Front 17

How is ice prevented from forming on the the engine inlet lips?

Back 17

Electrically heated lips which are operated by the ENGINE LIP BOOT switch.

Front 18

How are ice and dust particles prevented from entering the engine?

Back 18

Inertial Separator system which raises a vane into the airstream.

Front 19

What engine indications should you note when the inertial separators are used?

Back 19

Reduction in torque and increase in ITT.

Front 20

Which functions allow the prop go into a high RPM (Low Pitch) position?

Back 20

Oil pressure

Front 21

Which functions allow the prop to move to the low RPM/Feather (High Pitch) position?

Back 21

Centrifugal Counterweights and Feathering Spring

Front 22

What range does the primary prop governor operate?

Back 22

1800-2200RPM

Front 23

If the primary governor fails then what RPM does the secondary governor cut in?

Back 23

2288RPM

Front 24

If the governor sticks or is too slow to recognise a transient condition at which RPM does the Topping Governor operate?

Back 24

2332RPM which restricts the N1 RPM and the prop from overspeeding.

Front 25

What RPM Range is available during the primary prop governor test?

Back 25

1900-2100RPM

Front 26

What is the total fuel Capacity of the B90?

Back 26

2573lbs

Front 27

What is the fuel capacity of the Nacelle tanks and the Wing tanks?

Back 27

878lbs in the Wing tanks & 408lbs in the Nacelle tanks.

Front 28

How are the fuel vents prevented from icing up?

Back 28

Fuel vent heating.

Front 29

Why does the Boost pumps, Firewall Switch and Transfer pumps still operate after the master switch has been turned off?

Back 29

Because they are powered by a dual feed system and directly connected to the Battery Bus bar.

Front 30

What two conditions will show the NO TRANSFER annunciator panel?

Back 30

Transfer Pump failure or the wing tanks are empty and no fuel is being transferred to the Nacelle tanks.

Front 31

How is the NO TRANSFER annunciator light extinguished?

Back 31

Turning the transfer pump switch to OFF.

Front 32

With no Transfer pump how is fuel fed from the Wing tanks and at what point does this start?

Back 32

It is fed by Gravity and this occurs when the Nacelle tanks have reached 3/8 full.

Front 33

How much fuel is not able to Transfer from the Wing tanks to the Nacelle tanks should the Transfer pump fail?

Back 33

Approx 188lbs remains in each Wing tank should the Transfer pump fail.

Front 34

How many positions does the Crossfeed switch have and what occurs at each switch position?

Back 34

The Crossfeed switch has 3 positions, OPEN - CLOSED - AUTO. OPEN allows fuel to be feed to either engine from either side tanks. CLOSED closes the Crossfeed valve. AUTO means that is if a fall in fuel pressure is detected the valve will open and allows the remaining fuel pump to supply either engine.

Front 35

Can the engine still be feed fuel if the boost pump fails and the Crossfeed remain off?

Back 35

Yes, suction will still supply the engine with fuel but this is limited to 10hrs operation.

Front 36

What voltage is the electrical DC system on the B90?

Back 36

28 Volt DC system.

Front 37

What type of battery does the B90 have?

Back 37

24Volt / 40amp/hr Nickel Cadmium Battery.

Front 38

What capability do the Starter Generators have?

Back 38

The Starter Generators are 200amp/hr 28.25 Voltage Generators.

Front 39

What Amp fuse protects the two Generator Buses?

Back 39

A 325amp current limiter fuse.

Front 40

What size fuse is sub panel bus supplied through?

Back 40

50amp Circuit Breaker.

Front 41

What Voltage do the 2 Inverters produce?

Back 41

155Volts AC 400hz

Front 42

Why must the Battery Switch be on when connected to a GPU?

Back 42

To prevent voltage spikes and damage to aircraft electrical systems.

Front 43

What is the max GPU source which can be used?

Back 43

1000amps Max, anything greater may damage the starter.