ATA 61 Propeller

Question 1

How is the propeller blade angle controlled in

a) Beta Range
b) Constant Speed Range

Answer 1

a) By the power lever

b) Controlled by a governor in the PCU, which regulate Np in response to Condition Lever settings

Question 2

What will happen to the propeller blade angle if the oil pressure is lost during flight?

Answer 2

A Pitch Lock feature engages to prevent aerodynamic loads from reducing blade angle more than 1 degree adn propeller speed increasing more than 2% from the point of pressure loss

Question 3

What is the purpose of the Propeller Control Unit?

Answer 3

The PCU meters the engine oil to one side of the pitch change mechanism in the hub to reduce blade angle (fine) which is opposed by constant oil pressure supplied to the mechanism to increase blade angle (coarse)

Question 4

How can the propeller be feathered?

Answer 4

• Condition Levers to START & FEATHER
• Autofeather
• Manual alternate feather

Question 5

The propeller restricted range is between…?

Answer 5

500-780 rpm

Question 6

The propeller Beta Backup Protecting System;

a) What is the purpose
b) When will the system be disarmed

Answer 6

a) Propeller overspeed protection. Increases propeller angle if blade angle below flight idle with Power Levers above FLT IDLE gate
b) Power Levers 13° below FLT IDLE

Question 7

When is the propeller Autofeather System ARMED?

Answer 7

Torque > 50 %

Power Levers > FLT IDLE + 28° on both engines

Question 8

The propeller Alternate Feather Pump;

a) What is the purpose?
b) How can the pump be started?
c) The oil reservoir for the pump is located where?
d) The operating time for the pump is?

Answer 8

a) To permit propeller feathering or unfeathering in the event of engine oil supply failure or with the engine shut down
b) Automatic start with autofeather or manually by switches
c) In the reduction gearbox
d) 15 seconds

Question 9

The propeller synchrophase system - The master propeller is?

Answer 9

1 propeller

Question 10

What is the maximum take-off rating of a PW-121 engine?

Answer 10

2150 shp with automatic uptrim

Tq: 107,5, ITT 816, Nh 100%, 1212 rpm, 55-65 PSI, 45-115°C

Question 11

The engine is a free-turbine, two spool engine, means..?

Answer 11

No mechanical connection between the gas generator (NH gen and NL) section and the propeller

Question 12

The engine intake bypass doors;

a) Location
b) Operation
c) Indication

Answer 12

a) One in each nacelle at the rear lower (plenum) part. Prevents solids and precipitation from accumulating
b) Normally opened during icing conditions. Door opening and closing is controlled by ENGINE INTAKE BYPASS DOOR switchlights on the engine instrument panel

c) ENGINE INTAKE BYPASS DOOR switchlights
PUSH - CLOSED (green)
PUSH - HTR OPN (amber)
- Indicates door open and heater activation
- Heater activates with door open, engine oil pressure above 40 psid,
T< 15°C and AC power available

Question 13

When will the #1 ENGINE MANUAL caution light illuminate?

Answer 13

When fuel control in ON and an ECU fault occurs the fuel system goes into reversion

Question 14

How can the Quiet Taxi mode be initiated?

Answer 14

Condition Levers - MIN

Power Levers - FLT IDLE

Question 15

What will initiate a Power Uptrim?

Answer 15

Engine Failure –> The other engine’s torque will be increased by 10 %

Question 16

The purpose of the “Fail Fix” (-100) system is?

Answer 16

To maintain continous power (freeze the torque motor in the last position) in the event of ECU failure with engines at take-off power
(Rate selector - TOP, Power Levers FLT IDLE + 28°)

Question 17

The purpose of the “Uptrim Disable” switchlight is?

Answer 17

When performance calculations show that you must use MTOP, the UPTRIM DISABLE switchlight may be pushed to protect against a possible overtorque condition in event of an engine failure during take-off with MTOP

Question 18

The Autoignition System will automatically relight an engine if?

Answer 18

• Torque > 50%
• Ignition switch set to AUTO
• Condition Levers not selected to FUEL OFF

Question 19

How can you abort an engine start?

Answer 19

Condition Lever - FUEL OFF

Engine start, select switch - mid position

Question 20

What is the maximum starting temperature?

Answer 20

950°C

816 - 850°C max 20 seconds
850 - 950°C max 5 seconds

Question 21

The Power Levers controls?

Answer 21

• Engine speed in the forward power range;

- Propeller blade angle in the beta range (26° to -11,5°)

Question 22

The Condition Levers controls?

Answer 22

• Propeller RPM in the forward power range
• Feathering
• FUEL ON/OFF

Question 23

The Beta Warning Horn sounds if?

Answer 23

The Flight Idle Gates are lifted and the power levers are in a position forward (to prevent further movement to below flight idle) of FLT IDLE and the aircraft is airborne

Question 24

What is the purpose of the Beta Lockout System?

Answer 24

To prevent propeller overspeed when flight idle gates are lifted and power levers are moved below FLT IDLE when airborne

Question 25

How is the Beta Lockout System disabled on the ground?

Answer 25

RA < 50 ft and/or WoW on both main wheels will operate GND BETA ENABLE RELAY (Ground signal will energize realy anf disarm Beta Backup protection and Beta Lockout Systems)

Question 26

What happens when an engine instrument Test Button is pressed?

Answer 26

The pointer will move to a position opposite a blue dot, with an equivalent reading on the digital display

Question 27

Normal oil pressure is?

Answer 27

55 - 65 PSI

Question 28

When will ENG OIL PRESS warning light illuminate?

Answer 28

Oil pressure < 42 +/- 2 PSI