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ENG Flashcards

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1
Q

Engine rotation direction is to the 3 o’ clock position. Is that clockwise or counterclockwise (AFT LOOKING FORWARD)?

A

Clockwise

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2
Q

Output power of the -701D has Maximum Continuous Shaft Horse Power (SHP) of 1,716. True or False?

A

True

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3
Q

Primary engine mounts will support the engine and take up the vertical and side loads, but will the secondary mounts support the engine if a primary mount should fail?

A

Yes

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4
Q

Name the four engine modules

A

Cold section
Hot section
Power turbine section
Accessory section

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5
Q

The ATS serves what purpose?

A

The air turbine starter rotates the compressor through the accessory section module until the engine reaches an Ng speed that permits the engine to be self sustaining

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6
Q

What is the purpose of the radial driveshaft?

A

It turns the engine compressor section during starting from the ATS and drives the accessory section when the engine is operating

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7
Q

What is the purpose of the IPS?

A

It provides separation of foreign particles from the inlet airflow to protect the engine from erosion and damage

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8
Q

What does the engine Fuel system provide to the engine?

A

Pressurized, filtered fuel in the required amounts for combustion under varying power demands

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9
Q

The fuel boost pump is an engine-driven, non-self-priming suction and pressure pump, which ensures negative pressure. Why?

A

To reduce fire hazard in case of Fuel System damage

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10
Q

When engine fuel pressure drops below 9.0 psi, the pressure switch closes, and the MP receives a complete circuit signal. The MP will send a caution message to the EUFD and then signal to display a message on the MPD. Will this illuminate the MSTR CAUT pushbutton and caution tone (Beetle-beetle)?

A

Yes

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11
Q

Which occurs first, the red indicator button popping on the fuel filter , or the EUFD message FUEL 1 BYPASS?

A

Fuel filter housing red indicator button popping (impeding bypass)

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12
Q

The CHMU provides mechanical Ng overspeed protection to the engine at what percent Ng?

A

110% +/- 2 Ng

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13
Q

The ODV receives an electrical signal from the EDECU when an Np overspeed exists, opening the overspeed solenoid valve, which stops fuel flow to the injectors (causing flameout). At what Np speed does this occur?

A

118% +/- 1 Np

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14
Q

The engine oil filter has an impending bypass indicator that will cause a red indicator button to pop out when differential pressure across filter reaches 40-60 PSID. Will this send a signal to the MP?

A

No. This condition will normally be found during pre- or post- flight inspection.

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15
Q

What protects the engine lubrication system from excessive pressure during initial starts?

A

Cold oil relief valve

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16
Q

The oil pressure transmitter is responsible for sending a low oil pressure signal to the MP. When the MP receives this signal, what is the engine oil pressure?

A

Below 20-25 PSI

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17
Q

How long is emergency oil lubrication provided when Ng is 75%?

A

Approximately 30 seconds

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18
Q

Is the engine chip detector fuzz-burning or non-fuzz-burning?

A

Non-fuzz-burning

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19
Q

Is the engine chip detector fuzz-burning or non-fuzz-burning?

A

Non-fuzz-burning

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20
Q

Following a complete failure of an alternator, operation of the corresponding engine and all indications from engine instruments will be normal. What indication will be lost, will activate the MSTR WARN light, ENGINE 1 or ENGINE 2 OUT Voice and EUFD messages?

A

The Ng indications

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21
Q

Once the engine is self-sustained during the start process, are the igniter plugs used any more prior to engine shutdown?

A

No

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22
Q

Where does the thermocouple harness assembly measure the temperature of the gases for the engine?

A

At the power turbine inlet

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23
Q

In the event of an airframe electrical system failure, what position will the anti-ice/start bleed valve be in?

24
Q

How many Volts AC does the engine-driven alternator provide for the engine electrical system?

25
Which power level quadrant requires electrical power (BATT or EXT PWR) to manipulate engine power levers?
CPG power quadrant
26
When a power lever is advanced into LOCKOUT, what automatic features are lost?
Np governing and TGT limiting
27
What is the ignition override switch (IGN ORIDE position) used for?
The switch is discreet and will be used to abort automatic start sequence or disengage the ATS output if the sprag clutch fails to disengage
28
What are the Power Available Spindle (PAS) and the Load Demand Spindle (LDS) on the CHMU stage to in the crew stations?
The PAS is attached to the pilots power levers, and the LDS is connected to the collective servo’s bell crank
29
What happens to both engines when the engine chop is pressed?
The Np reference is removed, the engines will immediately decelerate to idle speed, and an ENG CHOP Warning message will be appear on the EUFD and a voice message will announce “engine chop”
30
The MPD ENG page displays what three formats?
Ground, Flight, and Emergency format
31
What two status windows (only one at a time) may appear in the upper right of the flight format when associated systems are outside operating ranges?
Engine oil pressure and hydraulic system pressures
32
Which status window of the two has priority when both systems are out of limits?
Hydraulic systems status window
33
When the ENG page auto pages to emergency format in response to an active Warning, how to you revert back to Flight format?
Acknowledge button (ACK, B4)
34
What engine parameters utilize the count-down timer feature?
Torque, TGT, and Ng
35
What are two types of engine HIT checks that can be performed?
Auto or Manual
36
How can you prevent the ECS from automatically activating the Heating mode?
By de-selecting BLEED AIR 1 and 2 on the A/C-UTIL page
37
When checking the BASELINE page you find that the values are different from those annotated on the HIT log. What should be done?
Enter the values found in the aircraft log book via the Keyboard Unit (KU)
38
When the TGT margin is within_______degree s or less of the table TGT, a write-up on the DA Form 2408-13 is required
5 degree C
39
What does it indicate when the TGT values are getting close to the established limits?
Engine performance degradation
40
Accessory Section components:
-CHMU -Fuel boost pump -Oil filter -Oil cooler -Alternator -Oil lube and scavenge pump -Inlet particle separator -Fuel filter assembly -Chip detector -Oil/fuel filter bypass sensors -Oil/fuel pressure sensors -Overspeed and drain valve (ODV) -Air turbine starter (ATS)
41
What is the Hot Start Prevention and what does it do?
Its a part of the EDECU and prevents overtemperature during engine start by activating a solenoid in the overspeed drain valve when Np and Ng are below their respective hot start reference and TGT exceeds 900 degrees C. This shuts off fuel flow and causes the engine to shut down.
42
What is the MTRA? What does it do?
Maximum Torque Rate Attenuator: reduces fuel flow and limits rate of torque increase to approximately 12% per second when transient engine torque exceeds 100% during an uncompensated maneuver
43
What is the TDI? What does it do?
Transient Droop Improvement Circuit: Prevents Nr droop during collective applications by increasing Nr if rapid collective is applied without continued demand being placed on the rotor system from a torque setting of less than or equal to 12% tq DE on TDI
44
When will dual engine contingency be activated?
When Np is less than or equal to 97% or Np is decelerating at 5% per sec or greater. Either condition met will increase the normal dual engine TGT limiter setting to 903
45
When is dual engine contingency power deactivated?
When Np recovers to greater than or equal to 99.5% and TGT is less than 879, TGT limiter resets to normal in one second
46
How does the Np Overspeed Protection System work?
If Np meets or exceeds 118.1 plus or minus 1%, two frequency sensing circuits output a signal to the overspeed system causing the ODV to shutoff fuel flow to the engine
47
What engine inputs does the EDECU receive?
-Thermocouple Harness -Np sensor -Torque and over speed sensor -Opposite engine torque for load sharing -Ng signal from the alternator -Np reference signal -A feedback signal from the CHMU for system stabilization
48
What does the Cold Section of the engine do?
Clean, Direct, Then compresses air
49
What does the Engine Overspeed Drain Valve (ODV) do?
- Provides fuel to the 12 fuel injectors, Np overspeed protection, fuel injector draining upon shutdown and full fuel in the fuel/oil heat exchanger to avoid priming for engine start
50
The Cold section is composed of what three sections?
-Inlet Section -Compressor Section -Diffuser Section
51
What does the Hot Section of the engine do?
Mixing of fuel and air for combustion
52
What does the Power Turbine section of the engine do?
Extracts energy from hot expanding gases and converts it into mechanical energy (SHP)
53
What does the Accessory Section of the engine do?
Provides for engine-driven accessories and engine starting
54
What components make up the accessory section? (Cool OFF HEADS)
-Oil cooler -Overspeed and drain valve -Fuel and lube filters -Fuel boost pump -Hydromechanical unit -Engine starter -Alternator -Chip detector -Inlet particle separator blower -Cavity for lube and scavenge pump
55
What does the ATS do?
Rotates the compressor, through the accessory section module, until the engine compressor reaches a speed that permits it to be self-sustaining (52% Ng)
56
What are the EDECU features?
M - MTRA S - Signal Validation T - Torque sharing / Load matching H - Hot Start Prevention O - Overspeed protection Np T - TGT limiting T - TDI
57
What are the three factors that limit engine performance?
1. TGT 2. Fuel Flow 3. Ng/ Mach
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