AH-64E > System II > Flashcards

System II Flashcards

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1
Q

APU

A

Auxiliary power unit- Provides aircraft with a self-supporting capability by eliminating the need for external power for starts or maintenance

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2
Q

What does the APU indirectly provide?

A

Hydraulic pressure
Electrical Power

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3
Q

What does the APU directly provide?

A

Pressurized Air that preludes the need for external power to start main engines

Air to engine and IPAS system

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4
Q

Is the APU DC or AC power?

A

DC

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5
Q

What section of the XMSN does the APU drive?

A

Accessory section which indirectly provides electrical power and HYD pressure

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6
Q

IPAS

A

Intergrated Pressurized Air System

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7
Q

Where is the APU located?

A

Inboard, right engine nacelle aft of main XMSN in catwalk under kevlar enclosure

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8
Q

What panel is the APU accessed through?

A

L325, catwalk doors

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9
Q

Purpose of the APU Enclosure?

A

Confines APU in the event of fire for extinguishing purposes

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10
Q

APU enclosure inlet allows?

A

Ambient air for cooling

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11
Q

APU inlet screen allows?

A

Ambient air for combustion

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12
Q

What is the approximate fuel burn for APU per hour?

A

175 lbs per hour

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13
Q

What three things does the APU enclosure provide?

A

1) Allows air for cooling
2) Ambient air for combustion
3) Confines the APU in even of fire for extinguishing purposes

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14
Q

2 major sections of APU?

A

1) Power section
2) Accessory Section

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15
Q

Power section provides?

A

-81 shaft HP to drive accessory section and main XMSN via #7 driveshaft

  • LCV (Load control valve) mounts to power section
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16
Q

LCV

A

Load control valve

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17
Q

Purpose of LCV (Load Control Valve)

A

Controls/Routes APU bleed air to IPAS manifold above 95% speed

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18
Q

Is the LCV closed or open on APU start and when does it open?

A

Closed, open by electronic control at 95% APU speed

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19
Q

When will the LCV (load control valve) close?

A

-APU shutdown <95%
-APU FIRE/RDY switch is activated

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20
Q

Purpose of APU Accessory section?

A

Provides means for starting, converts turbine wheel speed (56,566) to power takeoff (PTO) clutch speed (8216)

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21
Q

What is the turbine wheel speed?

A

56,566

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22
Q

PTO (Power takeoff) clutch speed

A

8216

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23
Q

Igniter unit

A

Increases low voltage input signal from ECU into high voltage output for APU igniters

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24
Q

What does the ECU provide?

A

ECU (Electronic Control Unit) provides:
-Automatic start
-PTO clutch operation
-Continuous monitoring and managing of APU
-Normal operation
-APU protection

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25
Low oil pressure switch
Solenoid activated at less than 75 PSI and sends signal to the ECU for APU operation
26
Vent Port
Vents excess pressure from the APU accessory gearbox
27
Oil filter
Removes contaminates from APU oil system (no bypass)
28
Oil pump (internal)
Provides pressurized oil for main bearings, gear meshes, and gear shafts Also supplies oil to activation of PTO clutch
29
Integral oil sump
Provides a container for lubricating oil
30
Oil sight gauge
Viewed through an access port on bottom of No.2 engine nacelle
31
Where is the oil sight gauge located on the APU?
Right side
32
What panel is the sight gauge?
RN5
33
Magnetic chip detector/Drain plug
Allows draining of the oil sump and to check for metal particles in the oil
34
Fuel control unit
Receives pressurized fuel from aft cell via electric fuel boost pump. Fuel auto energized when APU start button is pressed Located upper right AFT fuselage panel ammo bay
35
Fuel control shutoff valve
Allows pressure to build before releasing to APU nozzle, provides shutoff when APU is pressed
36
Fuel boost pump
Provides fuel for APU, located in ammo bay 24-28 Vdc
37
Fuel filter
Removes contaminates from APU fuel
38
Speed sensor monopole
Sends speed information from APU to ECU
39
Hydraulic start motor requires how much PSI
2600-3000 hydraulic pressure from the utility hydraulic accumulator for APU start
40
PTO (Power takeoff clutch) allows?
Coupling/ De-coupling from XMSN via No.7 driveshaft
41
What controls the engagement of PTO clutch?
ECU
42
Normal engagement of PTO clutch occurs at________ APU speed with Nr below ______
60% 95%
43
When does automatic engagement of PTO take place?
at 95% in cold weather below 0 degrees F. and sensed by the temperature transducer delayed by MP
44
The number _______ tachometer provides NR to the ECU
4
45
When will the ECU initiate auto shutdown for overspeed?
108% or loss of signal from the speed monopole sensor
46
Low oil pressure switch
Monitors oil pressure and send signal to ECU
47
When will the ECU command a shutdown?
1)Oil pressure below 75 psi 2)Oil psi not above 75psi at 95% APU Ng for 10 seconds
48
How does the ECU monitor exhaust gas temp?
Through thermocouple sensor
49
Where is the APU control switch located?
Pilot's power lever control quadrant
50
Where does the APU receive its fuel from?
The aft fuel cell
51
What does the APU ECU provide?
PTO clutch operation Automatic starting, Normal operations, APU operations
52
What does the PTO clutch provide?
Provides coupling/ de coupling between the APU and the XMSN accessory gearbox, through the No.7 driveshaft
53
Where is the APU oil level sight gauge located?
Right side of the APU and can be viewed through the access port on the bottom of the No. 2 engine nacelle
54
When viewing the APU oil level, where should the oil level be in the sight gauge?
Ball bearing should be midway on the sight gauge
55
The APU is divided into two major sections, What are they?
Accessory section Power turbine section
56
The PTO clutch normally engages when the APU reaches what percent?
60% APU speed
57
During cold weather operation with the XMSN oil temp below 0 degrees, when will the PTO clutch engage?
95% APU speed
58
The load control valve will open at 95% APU speed and will remain open until what two actions occur?
1) APU is shutoff 2) Fire/Ready push button is activated for the fire extinguishing system
59
Where is the APU start push button located?
Pilots power lever quadrant control panel
60
Minimum requirements for APU start/shutdown
-Battery or external power -Min 2600 PSI HYD accumulator -Fuel in aft cell -Oil level check
61
APU start up
-MST IGN SW- BATT or EXT PWR -APU start push button
62
How do you start the APU?
Depress the APU start button
63
How do you shutdown the APU?
Depress the APU start button
64
What is the only warning associated with the APU?
FIRE
65
What is the only caution associated with the APU system?
APU ON
66
Where are all advisory messages displayed?
EUFD (Enhanced up-front display)
67
What voltage does the LCV use to open?
28 V DC
68
To prevent accidental starting of APU _____ panel has APU/ECU start circuit breaker
ELC2
69
How many APU start attempts are allowed in one hour?
3
70
What is the max XSMN oil temp before the APU must be turned off?
140 Celsius
71
IPAS is comprised of ___________
Manifolds Ducts Valves Tubing Regulators Actuators 2 main engine starters
72
What generates the pneumatic power for IPAS?
Engine bleed air, APU, or AGPU air
73
What is the primary pneumatic power source for the Integrated Pressurized Air System (IPAS)?
#1 and #2 engines
74
What is the secondary pneumatic power source for IPAS?
Single engine
75
What is used for external air source for the IPAS?
AGPU or APU
76
Low pressure Venturi
Limits flow of bleed air to 6.5% of total engine compressor core flow in event of IPAS leak
77
Where is the low-pressure venturi mounted?
On the engines at low pressure bleed air port
78
PRSOV
Pressure regulator shutoff valve
79
Engine pressure ranges from ______ to ___
45 to 55
80
What monitors the manual control selection of eng 1 and 2 bleed air?
MP (Mission processor)
81
Purpose of flow share sense lines?
Interconnects PRSOVs to ensure both engines are supplying an equal amount of bleed air
82
Where is the 2 sense lines routed?
Through AFT equipment bay
83
Engine/APU check valves prevent ____
Backflow of pressurized air
84
What receives and distributes IPAS air from APU/ENG to components?
Primary/Low pressure manifold
85
Receives air in the 450-500 temperatures and limits them to 450F
Bleed Air Precooler
86
Controls engine air temp downstream from the precooler below 450F
Precooler Bypass Temp thermostat
87
Allows IPAS air to bypass precooler during colder operations. Permits system to reach temps quickly
Precooler bypass control valve
88
Where is the precooler bypass control valve located?
AFT equipment bay
89
Monitors the IPAS temp and provides signal to MP
Bleed air overtemp switch
90
What temp does the over temp switch close to send a signal to MP for advisory?
490F
91
What temp does the overtemp switch open?
450F
92
Which components maintain the pressure of low-pressure IPAS air?
PRSOV (Pressure regulator shutoff valve)
93
Which component limits maximum normal bleed air supply temperature to 450F?
Bleed air precooler
94
When does the APU load control valve open during APU starts?
When the APU reaches 95% speed
95
What is mounted directly on the engines at the low-pressure bleed air port and connects to the IPAS ducting leading to the engine bleed air PRSOVs?
Low-pressure venturi
96
What does the ECS (environmental control system) use IPAS air for?
Heating crew station Air particle separator (APS)
97
The _______ converts pneumatic energy to shaft power
ATS (Air turbine Starter)
98
The shaft power is used for what
Starting or motoring main engines
99
At ______ % Ng, air to ATS shuts off and ignition is terminated
52%
100
_______ controls IPAS air flow and pressure into the ATS as commanded by the MP
ATS PRSOV (Pressure regulator shut off valve)
101
What commands the ELC (Electrical Load Center) to open or close the ATS PRSOV?
MP (Mission processor)
102
ELC
Electrical Load Center
103
Voltage for ATS PRSOV
28 Vdc
104
_______ regulates the IPAS pressure for the fuel boost pump, fuel transfer pump valve to ______
Fuel system pressure regulator 19 (+-3) PSIG
105
Provides reliable feed from the aircraft fuel tank to engine
Fuel boost pump
106
When is the fuel boost pump primarily used?
Pressurized fuel for engine start and emergency fuel pressure
107
Pneumatically driven pump allowing transfer of fuel between the forward and AFT fuel cells
Fuel Transfer Pump
108
Uses IPAS air to create low pressure area aft of the probe
Ice detector probe
109
Speed for Ice detector probe?
100 KTS
110
NIU
Nitrogen Inerting Unit
111
Designed to remove the oxygen in the fuel cells to a level enough to inhibit combustion.
NIU (Nitrogen Inerting Unit)
112
Engine firewall louver
Closed if activated by fire extinguishing panel
113
Receptacle that provides a connection to the IPAS for troubleshooting and air pressure to operate air-powered tools
Utility Air Receptacle
114
Why does the ECS (environmental control system) use as IPAS air?
Heating the crew stations and air particle separator
115
What does the Nitrogen Inerting Unit (NIU) do with IPAS air?
The NIU cools, dries, and removes oxygen from IPAS air. Then routes it to the fuel cells to inhibit explosive vapor build up
116
What does the fuel system pressure regulator valve reduce pressure down to?
19 (+- 3) PSIG
117
High pressure IPAS components
-High pressure manifold -High pressure check valves -Primary/utility hydraulic reservoir pressure regulators -Primary/utility hydraulic reservoir pressure relief valves
118
Factory calibrated to reduce high-pressure bleed air to 31 (+- 3) PSIG for primary/utility hydraulic reservoirs
Primary/Utility hydraulic reservoir pressure regulators
119
Which components control the pressure of high-pressure air?
The primary/utility hydraulic reservoir pressure regulators
120
What is the purpose of the ENG No.1 and ENG No.2 high-pressure check valves?
Backflow of the 5th stage bleed air from engine to engine
121
The primary/utility hydraulic reservoir pressure regulators reduce high-pressure bleed air to what pressure?
31 (+-3) PSIG
122
Solid dots on UTIL pg of MPD Bleed air 1 or 2 indicates_____
Engine bleed air PRSOVs are sensed by the MP to be 80% or greater
123
Where can the engine PRSOV be commanded to open or close?
UTIL pg ----> Bleed air buttons
124
Where are the bleed air controls located?
Aircraft Utility Page
125
When one or both engines are at 100% Np and the APU is still operating, what supplies pressurized air to the low-pressure manifold?
The APU
126
When does air from the low-pressure manifold pressurize the primary and utility hydraulic reservoirs?
During APU only operations (No engine running)
127
What does the advisory ENG 1 BLD AIR FAIL on the EUFD indicate?
The MP commanded the engine 1 bleed PRSOV open or closed, and it did not move as directed
128
What does the advisory BLEED AIR OFF indicate?
Engine one or engine two bleed air have been manually shut off
129
What does the advisory BLEED AIR HOT indicate?
MP has detected a bleed air over temp (>490F)
130
Primary source of IPAS
engine #1 and #2
131
Secondary source of IPAS
Single engine
132
Ground/External source IPAS
AGPU or APU
133
PRSOV reduces the 45 to 55 PSIG to _____
25 (+-3)
134
When does MP display bleed air off?
Both bleed air 1 and 2 manually off (circles on util pg)
135
what maintains the temp of bypass air? (450F or less)
Bleed air precooler
136
There are no warnings or cautions just advisories for the IPAS system T/F?
True
137
Advisories for IPAS
1) Bleed air HOT 2) Bleed air OFF 3) Bleed air eng 1fail 4) Bleed air eng 2 fail
138
ATS 1 or 2 hang caution means
ATS stuck open
139
fuel PSIG
19 (+-3) PSIG
140
What does the fuel transfer pump allow?
Transfer fuel between forward and AFT fuel cells
141
Prevents or removes moisture (fogging) on the inside canopy side panels?
Canopy Defog using air mixer
142
The primary and utility hydraulic reservoir pressure regulators reduce high pressure bleed air to ______
31 (+- 3) PSIG
143
Max PSI for hydraulic pressure is _____
55 PSI, normal is 31 (+-3)
144
What components control the pressure of high-pressure air?
The primary and utility hydraulic reservoir pressure regulators
145
What is the purpose of the engine No.1 and engine No.2 high-pressure check valves?
Backflow of the 5th stage bleed air from engine to engine
146
With engines and APU on, the engines run_____
Hydraulics
147
Where are the bleed air controls located?
Aircraft UTIL page
148
When one or both engines are at 100% Np and the APU is still operating, what supplies pressurized air to the low-pressure manifold?
The APU
149
When does air from the low-pressure manifold pressurize the primary and utility hydraulic reservoirs?
During APU only operations (no engines running)
150
What does the AH-64 fuel system provide?
Fuel to two main engines and APU (Auxiliary Power Unit) while displayed on the MPD for awareness
151
How is fuel management performed?
Using the MPD (Multipurpose display)
152
Primary fuel types
JP-4 JP-5 JP-8
153
Fuel capacity Forward, Internal, and Aft
Forward - 156 Gal Internal- 100 Gal AFT- 220 Gal
154
Total fuel capacity
476 Gal
155
Fuel cell is self-sealing up to _____ Lower portion is self-sealing up to ______
12.5MM 14.5 MM
156
N2 check valve prevents _______
Fuel from entering the NIU
157
Where is the NIU test panel located?
Right aft avionics bay
158
What provides operator inputs for fuel management and displays fuel system status and indications?
MPD (Multipurpose device)
159
What provides signal to MP to close the fuel SOV (shut off valves) and APU SOV when FIRE pushbutton is pressed?
Fire Detect/Extinguishing panel
160
What displays the fuel system cautions, advisories, and total fuel quantity?
EUFD (Enhanced Up Front Display)
161
What is the purpose of the fuel breakaway valve?
Reduce fire hazards by sealing the cells and lines during high-impact landing
162
What is the max useable capacity of internal auxiliary fuel tank?
100 gal
163
What, if any is the indication that the NIU has failed?
The indicator on the NIU test panel has three white triangles
164
Fuel transfer air valve controls _____
air input to transfer pump
165
When does the fuel level control valve close?
When cell is full
166
what happens when C AUX is selected on fuel page of MPD?
Fuel is transferred from the internal auxiliary tank to both forward and aft cells simultaneously
167
What is the purpose of the fuel transfer system?
To allow for the transfer of fuel between the internal fuel cells and from all external auxiliary tanks to the internal fuel cell
168
What are the two fuel transfer modes?
Automatic Operator Selectable
169
What, if any, is the indication when internal auxiliary (center tank) fuel transfer is selected and fails?
Advisory CTR XFER FAIL will be displayed on the EUFD
170
What, if any, is the indication when the fuel transfer pump fails?
Caution FUEL EXFER FAIL will be displayed on the EUFD
171
What allows both engines to draw fuel from either internal fuel cell?
Fuel crossfeed
172
What commands the ELC to close fuel crossfeed valves when FIRE pushbutton is pressed?
MP (mission processor)
173
What is the purpose of the fuel crossfeed subsystem?
To allow both engines to draw fuel from either internal fuel cell
174
How are the crossfeed modes controlled?
operator or MPD fuel page
175
Why must the crossfeed be in the normal mode at all times while in flight unless executing an emergency procedure?
A malfunctioning crossfeed shutoff valve could result in a SE flameout
176
During engine start, the crossfeed mode for that engine is automatically set to what mode?
AFT
177
What, if any, is the indication that a crossfeed valve did not go to the commanded position?
Caution XFEED VALVE FAIL will be displayed
178
Purpose of the fuel quantity subsystem is ______
Measures remaining fuel and detects low levels in the fuel cells
179
Fuel quantity subsystem provides _____ when external tanks are empty
Advisories
180
Fuel quantity subsystem provides _____ when fuel is low
Cautions
181
Where are the fuel quantity transmitters located?
One in aft cell Two in forward cell
182
Where is the fuel output changes routed to?
Fuel signal conditioner
183
Where does the fuel signal conditioner provide a status to?
MP (Mission processor)
184
What is considered low level in the forward and aft fuel cells?
Forward- below 240 lb AFT- below 260 lb
185
What indicates when the fuel cell is empty?
Internal Auxiliary fuel cell pressure switch
186
What advisory is displayed on the EUFD when tank is empty?
CTR TANK EMPTY A white letter "E" on tank icon
187
What is the purpose of the fuel quantity subsystem?
To measure remaining fuel and detect low levels in the internal fuel cells
188
How is remaining fuel quantity displayed?
Pounds for each fuel cell and total pounds of internal fuel remaining
189
When is the FWD FUEL LOW caution message displayed?
FWD cell drops below 240lbs
190
When is the AFT FUEL LOW caution displayed?
AFT cell drops below 260lbs
191
What, if any, is the indication when the internal auxiliary tank is empty?
Advisory CTR TANK EMPTY will be displayed. White "E" on the center of the tank icon
192
Fuel boost subsystem provides ____
pressurized fuel to the engines during the engine start sequence or for an emergency using the boost button
193
What controls the fuel boost shutoff valve?
MP (mission processor)
194
What drives the boost pump?
IPAS air
195
What is the purpose of the fuel boost subsystem?
To provide pressurized fuel during engine start and when selected by operator
196
When the boost pump is on, where does it draw its fuel?
Aft fuel cell
197
What does the boost pump thermal relief valve do?
Relieves pressure buildup caused by heat expansion of the fuel in the fuel lines
198
During normal flight operation, is the fuel boost pump on or off?
off
199
What, if any, is the indication that the boost pump has failed?
The caution BOOST PUMP FAIL will be displayed on the EUFD
200
What is the purpose of the APU fuel subsystem?
To provide fuel to the APU
201
What is the fuel source for the APU
AFT fuel cell
202
What is the power source for the APU fuel boost pump?
24-28 VDC
203
During normal flight operations, is the fuel boost pump on or off?
off
204
What, if any, is the indication that the APU fuel shutoff valve has failed?
Advisory APU FUEL VALVE will be displayed on the EUFD (Enhanced Up Front Display)
205
Radio transmissions will be limited to ________ until refueling has been completed
Emergency Only
206
What position should the rotary fuel knob be in before/after refueling operations?
NORM
207
CAUTION: Refueling pressure will not exceed _________ PSI
55
208
What is the purpose of the refuel subsystem?
To allow for pressurized and gravity refueling of the aircraft
209
What is the max fueling pressure for gravity refueling?
15 PSI
210
What is the max fueling pressure for single-point adapter pressure refueling?
55 PSI
211
What warning is associated with gravity refueling?
Use extreme care when venting the fuel cell to preclude venting fuel out of the filler neck
212
What fuel system controls and displays are utilized in the management of the fuel system?
MPD EUFD APU switch Fire detect/extinguish panel Fire push button
213
Where is endurance displayed on the aircraft?
INST and TSD pages, when 20 min is reached the time is white and flashes
214
Trap fuel in fuel lines in event of hard landing____
Fuel breakaway valves
215
Removes cools and dries oxygen before sending into fuel system___________________________
NIU (Nitrogen Inerting Unit)
216
Where is NIU located?
Right Aft avionics bay
217
How do you know NIU has failed?
3 white triangles on NIU panel
218
How is fuel transfer accomplished?
IPAS air and fuel page
219
How do you know if a fuel tank is empty?
White E on fuel page at corresponding tank
220
Crossfeed should remain in _______
NORM
221
Engines should start at about ______ Ng
52%
222
How is the fuel shut off to an engine when fire button is pressed?
At cross feed valve
223
Cross feed valve 1 or 2 failure will cause?
Achieve VSSE and expect Single engine flame out
224
Refueling pressure will not exceed _______ PSI
55
225
WARNING: When opening the anti-siphoning device, extreme care should be exercised when releasing air pressure by ____________________________
Pulling the chain to vent
226
When is SFR displayed?
Above 10KTS, gives best fuel range
227
Two types of engine mounts
Primary- Support vertical and side loads Secondary- Back-up in case primary mounts fail
228
Purpose of cold section module ______
Clean, Direct, Compress
229
Purpose of Hot section module _______
Nozzles direct hot expanding gases to drive stage 1 and 2 rotors (Ng)
230
Purpose of power turbine module _______
Extracts energy from hot gases, converts to mechanical energy (Np)
231
When is the ATS (air turbine starter) self-sustaining?
52% Ng
232
The visual indicator on the ATS should be ______ on pre-flight
Closed
233
How is the engine cooled?
By air drawn into nacelles, engine firewall louvers
234
How are the engine louvers operated?
By 5th stage bleed air
235
On which side of the 64 is ENG 1 located on?
Left side
236
Engine rotation direction is to the 3 o'clock position. Is that clockwise or counter-clockwise (AFT looking forward)?
Clockwise
237
Output power of the 701D has max continuous shaft horse power of 1,716? True/False
True
238
Primary engine mounts will support the engine and take up the vertical and side loads, but will the secondary mounts support the engine if the primary mounts should fail?
Yes
239
Name the four engine modules _____
1) Cold section 2) Hot section 3) Power turbine section 4) Accessory section
240
The ATS serves what purpose?
ATS rotates the compressor through the accessory section module until the engine reaches an Ng speed that permits the engine to be self-sustaining
241
What is the purpose of the radial driveshaft?
It turns the engine compressor section during starting from the ATS and drives the accessory section when the engine is operating
242
The GE-701D engine cold section module is designed to do what?
Clean, directs, and compress the air moving into the engine
243
Fuel system components provide ______
Pressurized, filtered fuel for varying power
244
The fuel boost pump is an engine-driven, non-self-priming suction and pressure pump, which ensures negative pressure.. why?
To reduce fire hazard in case of fuel system damage
245
When engine fuel pressure drops below 9 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)?
Yes
246
Which occurs first, the red indicator button popping on the fuel filter housing, or the EUFD message FUEL 1 BYPASS?
Fuel filter housing red indicator button popping (impending bypass)
247
The CHMU provides mechanical Ng overspeed protection to the engine at what percent Ng?
110% (+-2) Ng
248
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?
118.1
249
The engine oil filter has an impending bypass indicator that will cause a red indicator button to pop out when differential pressure across the filter reaches 40–60 psid. Will this send a signal to the MP?
No. This condition will normally be found during pre- or post-flight inspection.
250
What protects the engine lubrication system from excessive pressure during initial starts?
Cold oil relief valve
251
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?
Below 20–25 psi
252
Emergency lubrication for the number 1, 2, 3 and 4 bearings is provided by oil misting from jets, using reservoirs in A and B sumps. Does the C sump provide any emergency lubrication?
No
253
How long is emergency oil lubrication provided when Ng is 75%?
Approximately 30 seconds
254
Is the engine chip detector fuzz-burning or non-fuzz-burning?
It is non-fuzz-burning
255
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?
The Ng indications
256
How is the engine anti-ice/start bleed valve mechanically controlled?
By the CHMU during starts through the same linkage that positions the Inlet Guide Vanes (IGV) and variable-geometry stator vanes. It opens and closes at different Ng speeds dependent upon ambient air temperature.
257
Once the engine is self-sustained during the start process, are the igniter plugs used any more prior to engine shutdown?
No
258
Where does the thermocouple harness assembly measure the temperature of the gases for the engine?
At the power turbine inlet
259
In the event of an airframe electrical system failure, what position will the anti-ice/start bleed valve be in?
Open
260
How many Volts ac does the engine-driven alternator provide for the engine electrical system?
115 VAC
261
Which power lever quadrant requires electrical power (BATT or EXT PWR) to manipulate engine power levers?
CPG power quadrant
262
When a power lever is advanced into LOCKOUT, what automatic features are lost?
Np governing and TGT limiting
263
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 shaft if the sprag clutch fails to disengage
264
What are the Power Available Spindle (PAS) and the Load Demand Spindle (LDS) on the CHMU attached to in the crewstations?
The PAS is attached to the pilot’s power levers, and the LDS is connected to the collective servo’s bellcrank
265
What happens to both engines when the engine chop button 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.”
266
The MPD ENG page displays what three formats?
Ground, Flight, and Emergency format
267
What two status windows (only one at a time) may appear in the upper right of the Flight format when associated systems are outside normal operating ranges?
Engine oil pressures and hydraulic system pressures
268
Which status window of the two has priority when both systems are out of limits?
Hydraulic systems status window
269
When the ENG page autopages to Emergency format in response to an active Warning, how do you revert back to Flight format?
Acknowledge button (ACK, B4)
270
What engine parameters utilize the count-down timer feature?
Torque, TGT, Np and Ng
271
What are two types of engine HIT checks that can be performed?
Auto or Manual
272
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
273
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)
274
When the TGT margin is within __________ degrees or less of the table TGT limit, a write-up on the DA Form 2408-13 is required.
5 °C
275
What does it indicate when the TGT values are getting closer to the established limits?
Engine performance degradation
276
Compressor section and power turbine spin in what direction?
Clockwise
277
Engine is broken down to what 4 major subparts
1) Cold section- Clean, Direct, Compress 2)Hot section 3) Power turbine assembly 4) Accessories
278
Where is Ng read from?
Engine Alternator
279
ATS drives _______ driveshaft
radial driveshaft
280
IPS
Inlet particle separator (Separates foreign particles from inlet airflow)
281
Engine cooling louvers are operated by _______
engine bleed air
282
Ensures the primary fuel supply system is under negative pressure
Engine driven fuel boost pump (upper left)
283
Engine driven fuel boost pump continuously _______
Drives fuel to engine
284
Where is the engine driven fuel boost pump located?
Upper left face of accessory section
285
What checks the fuel pressure sensor?
MP (Mission processor)
286
Engine anti ice is held electrically ______
Closed
287
Start bleed valve will auto ______ when loss of electrical power
Open
288
Power available spindle is connected to _____
PAS is connected to power lever
289
Load Demand Spindle is connected to ______
LDS is connected to collective
290
Ng overspeed protection at ___
110 (+-2)
291
Np protection overspeed at _____
118
292
ODV
Overspeed Drain Valve
293
3 Position of ODV (Overspeed Drain Valve)
1) Open- at start 2) Closed- Shutdown 3) Closed- during overspeed event (118 Np)
294
how many fuel injectors?
12
295
Cold oil relief valve helps ______
Protect engine during cold starts, vents excess pressure
296
A sump and B sump has _________ lubrication for 30 sec
emergency
297
Does c sump have emergency lubrication?
No
298
Engine chip detector is ______ fuzz burning
Non
299
How does engine oil cooler cool oil?
With cold fuel (Heat exchanger)
300
Green cables represent?
Crew station indications
301
Yellow cables represent?
Power and fuel control (begins at alternator)
302
Blue cables represent?
Torque signals, overspeed signals
303
Black cables represent?
Ignition
304
Alternator has three windings 1) 2) 3)
1) Ignition 2) EDECU power 3) Ng speed signal
305
Ignition exciter is for ____
Starting only, 115 VAC to 5000-7000 VDC
306
EDECU controls _______
(Enhanced digital electronic control unit) Transmits information
307
CHOP button on the flight grip reduce both engines electronically to _______
IDLE
308
On engine start MPD should be on ____ page
Ground
309
Flight page when power levers to _____
Fly
310
Ground page won't return until after shutdown and -_______
restart
311
Emergency page defaults to ______ MPD for all aircraft warnings
Left
312
BUCS
Back Up Control System
313
______ mechanical controls are routed along ______ side of aircraft
Lateral, Left
314
_______ mechanical controls are routed along the ________ side of aircraft
Longitudinal, right
315
Upper flight controls receive and combine input from ______ and ______
Cyclic and collective
316
Collective bell crank from ______
servo to non-rotating swashplate
317
Lateral bell crank from _______
lateral servo to non-rotating swashplate
318
Longitudinal bell crank from _____
Longitudinal servo to non rotating swashplate
319
Torque link transmit _____
longitudinal motion/fixed point for non-rotating swashplate
320
Provides directional control to tail rotor system?
Anti-torque brakes
321
AH-64E
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