All Engineering Flashcards
(277 cards)
1
Q
What does LPAC stand for?
A
Low pressure air compressor
2
Q
Where is LPAC #1 located?
A
1 Lpac is in AUX-1
3
Q
Where are LPAC #2 and #3 located?
A
2 and #3 Lpac is in Aux-2
4
Q
What type of LPACs are on board?
A
Rix star 200, water cool, oil free, screw type compressor
5
Q
What are the pressure ranges for the lead, lag, and standby modes of LPAC?
A
- Lead: 115-125 psi
- Lag: 110-120 psi
- Stby: 105-115 psi
6
Q
What is the purpose of the LPACs?
A
To provide vital and non-vital air
7
Q
What does non-vital low pressure air provide air to?
A
Pneumatic tools, ship laundry
8
Q
What does vital low pressure air provide air to?
A
MRG Clutch and brake, Radars
9
Q
Where are the potable water pumps located on board?
A
1A and #1B potable water pumps are in Aux-1
10
Q
Where are the potable water tanks located?
A
Underneath the gym
11
Q
Where are the potable water risers located?
A
Port smoke deck and Stbd side of stairway to heaven
12
Q
How many fire pumps are on board?
A
7
13
Q
What are the locations of the fire pumps?
A
- # 1 F/P: Aux-1
- # 2 F/P: Main-1
- # 3 F/P: Main-2
- # 4 and #5 F/P: Aux-2
- # 6 and #7 F/P: Fire pump room
14
Q
What is the psi and gallon per minute rating of the fire pumps?
A
170 psi and 1000 gpm
15
Q
How many Auxiliary Sea Water (ASW) pumps are on board?
A
4
16
Q
What are the locations of the ASW pumps?
A
- # 1 ASW pump: Aux-1
- # 2 ASW pump: Main-1
- # 3 ASW pump: Main-2
- # 4 ASW pump: Aux-2
17
Q
What equipment do the ASW pumps provide to?
A
- Hpac’s
- Lpac’s
- A/C’s
- Stern tube cooling
- Debac’s
18
Q
How many Ship Service Diesel Generators (SSDG) are on board and where are they located?
A
Total of Four, #1 and #2 SSDG in AUX-1, #3 and #4 SSDG in AUX-2
19
Q
What are the characteristics of the SSDGs?
A
- Manufacturer: Fairbanks Morris
- 12 cylinder opposed piston
- 900 rpm
- 1377 brake horsepower
- 450 volts
- 60 hertz
- 2566 Amps
- 1600 kilowatts
- Fuel: F-76 fuel oil
- Lube oil: SAE 40
20
Q
How many Main Propulsion Diesel Engines (MPDE) are on board and where are they located?
A
Total of 4, #1A and #1B MPDEs in Main-1, #2A and #2B MPDEs in Main-2
21
Q
What are the characteristics of the MPDEs?
A
- Manufacturer: Colt Pielstick
- 16 cylinders
- V block configuration
- Twin turbos
- 520 rpm
- 8500 brake horsepower
- Fuel: F-76
- Lube oil: SAE 40
22
Q
How many Reverse Osmosis (RO) units are on board and where are they located?
A
Total of 2, #1 RO in Main-1, #2 RO in Main-2
23
Q
How much water does a RO make in a day?
A
36,000 gallons of water each
24
Q
How many High Pressure Air Compressors (HPAC) are on board and where are they located?
A
Total of 2, #1 HPAC in Main-1, #2 HPAC in Main-2
25
What type of HPAC is on board?
Rix 5 stage swash-plate compressor
26
At what psi does the HPAC start and stop?
Starts at 2700 psi +/- 50 and stops at 3000 psi
27
What is the purpose of the HPAC?
Provide vital air
28
What does vital high pressure air provide air to?
* Air start for MPDEs
* SSDGs
* SCBA Recharging station
29
How many Main Reduction Gears (MRG) are on board and where are they located?
Total of 2, #1 MRG in Main-1, #2 MRG in Main-2
30
Who manufactures the MRG?
Philadelphia
31
What is the purpose of the MRG?
To convert high speed low torque of the MPDE into low speed high torque of the shaft
32
What is the ratio of the MRG?
3.15:1
33
What is the purpose of the SAE-40 lube oil purifiers (LOP)?
To purify MPDE’s lube oil
34
How many SAE-40 LOPs are on board and where are they located?
Total of 2, #1 SAE-40 LOP in Main-1, #2 SAE-40 LOP in Main-2
35
What is the purpose of the 2190 LOP?
To purify CPP and MRG lube oil
36
2190 lube oil acts as __________ for the MRG system?
lubricating oil
37
2190 lube oil provides ________ for the CPP system?
Hydraulic oil
38
What is the purpose of the Hydraulic Oil Power Module (HOPM)?
Provide control oil to the Oil Distribution Box (OD Box)
39
What is the purpose of the OD Box?
To use control oil to direct flow of power oil to change the angle of the propellers
40
How many Line Shaft Bearings (LSB) are there and where are they located?
Total of 9 LSBs
41
What is the purpose of the LSB?
Support the weight of the shaft, cool the shaft and absorb radial thrust
42
What are the watch standards positions in Main Control?
* EOOW
* PAC
* EPC
43
What are the types of high pressure air reducing stations?
* 3000/425
* 3000/250
* 3000/200
* 3000/80
44
Where are the HP reducing stations located?
* 3000/425: Main-1
* 3000/200: Main-2
* 3000/80: Main-1 and Main-2
* 3000/250: Aux-1 and Aux-2
45
What is the purpose of the Stern tube seal?
To allow the shaft to exit the ship and prevent flooding
46
What is the purpose of the Strut bearing?
To support the shaft outside the skin of the ship
47
What is the purpose of the Kingsbury thrust bearing?
Absorb axial thrust of the shaft to the hull of the ship
48
What does CHT stand for?
Collection, Holding and Transfer
49
What is the function of the CHT system?
Sewage is collected into a tank where it is held on board or transferred overboard or to a sewage facility
50
What is considered black water?
Sewage: Waste of human origin from water closets and urinals
51
What is considered grey water?
Waste water from deck drains, lavatories, showers, dishwashers, laundries, garbage grinders, and medical facilities
52
How many sewage tanks are onboard USS Harpers Ferry?
7
53
What is the capacity of the Main CHT Pump Room?
14,029 gallons
54
What type of pumps discharges CHT from the Main CHT Pump Room?
2 EDDY Pumps (1A & 1B) rated at 300 GPM
55
What is the purpose of the aerator system in the Main CHT Pump Room?
To discourage the formation of sludge solidification and toxic gas H2S
56
What is the tank capacity of the Port CHT Pump Room?
650 gallons
57
What type of pumps are used in the Port CHT Pump Room?
Macerator Pumps (2 & 4) rated at 20 GPM
58
What is the tank capacity of the Starboard CHT Pump Room?
650 gallons
59
What is the capacity of the tanks in Main Machinery Rooms and Auxiliary Rooms?
15 gallons
60
What are the three modes of the CHT system?
* Inport
* Transit
* At-Sea
61
What does the H2S Detection System monitor?
The presence of Hydrogen Sulfide in the air
62
What occurs at 0.2 parts per million of H2S?
Gives off a rotten-egg odor
63
What happens at 10 parts per million of H2S?
Yellow strobe-light flashes and warning buzzer alarm sounds
64
What is considered IDLH for H2S?
100 parts per million
65
What should be done if a sewage spill occurs?
Clean the area with hot potable water, stock detergent, and Betadine/Wescodyne/Povidone-Iodine Solution
66
What personal protective equipment (PPE) is recommended for sewage clean-up?
* Disposable coveralls
* Goggles
* Faceshield
* Rubber boots
* Laundry bags
* Impermeable rubber gloves
67
What is the purpose of ballast?
To expertly sink the ship for stability
68
How many ballast tanks are onboard?
87
69
What is the purpose of deballasting?
To raise the ship
70
What is the procedure to fill 5th and 6th deck tanks?
Open sea valve, shut blow, and open vent
71
What is the procedure to drain 5th and 6th deck tanks?
Open blow, shut vent, open sea after pressure build-up
72
What do hydraulic power units (HPU) operate?
Fill, sea valve, and gravity drain valves
73
How many deballasting air compressors (DBAC) are onboard?
4
74
What is the list in nautical terms?
Degree from port to starboard
75
What is the trim in nautical terms?
From forward to aft
76
What does SSDG stand for?
Ship Service Diesel Generator
77
What is the manufacturer and type of diesel engine for the SSDGs?
Fairbank Morse 38ND 8 1/8 12 cylinder 24 piston
78
What type of generator do we have for the SSDGs?
Brushless generator, Kato manufacturer
79
What are the generator ratings?
* 450V
* 60HZ
* 0.8PF
* 1600KW
* 2566 Amp
80
How many SSDGs are there and where are they located?
4, 1 & 2 in Aux 1, 3 & 4 in Aux 2
81
What does GCB stand for?
Generator Circuit Breaker
82
What does a GCB do?
Connects generator to the switchboards
83
How many switchboards are there?
8
84
What are the locations of the switchboards?
* 1 & 2 in Aux 1
* 3 & 4 in Aux 2
85
What does BTB stand for?
Bus Tie Breaker
86
What connects switchboards together?
BTB
87
What is the function of a GCB?
Connects Generator to the switchboards
88
Where are switchboards 1 & 2 located?
Aux 1
89
Where are switchboards 3 & 4 located?
Aux 2
90
What connects switchboards together?
BTB, Disconnect links
91
How many degaussing coils do we have?
4
92
What are the names of the degaussing coils?
* M-coil (main coil)
* A-coil (Athwarthship coil)
* FIQI (fosc’le induce and Quarterdeck Induce)
* FPQP (fosc’le permanent and Quarterdeck permanent)
93
Where is the remote degaussing console located?
Pilot House
94
Where is the power supply for degaussing located?
Degaussing Room (3-70-3-E)
95
Where is the main degaussing switchboard located?
Aux 1 EOS (Booth)
96
How are the A, M, FIQI, and FPQP coils wrapped around the ship?
* M around the waterline of the ship
* A FWD and AFT of the ship in a U shape
* FIQI, FPQP are in a figure 8 from Fosc’le to Quarterdeck
97
What does SFC stand for?
Static Frequency Changer
98
What does an SFC do?
Changes 60Hz to 400Hz
99
What is 400Hz used for?
* LCAC’s shore power
* Weapons systems
* Radars
* IC gyro
* Combat systems
100
Where is 1STC 400Hz Converter located?
By Anchor windlass (01-11-4-Q)
101
Where are 3STC-A and 3STC-B 400Hz Convertors located?
Aft for post office (1-74-3-L)
102
What is 1STC used for?
Service only
103
What is 3STC-A used for?
Swing STC, can be used for LCACs and ship service
104
What is 3STC-B used for?
Only for LCAC Shore Power
105
Where are the 400Hz Switchboards located?
* 1SF in forward STC room (01-11-4-Q)
* 2SF by IC gyro (03-54-1-Q)
* 3SF in Aft STC room (1-74-3-L)
106
What does EPCC stand for?
Electrical Plant Control Console
107
What does ABT stand for?
Automatic Bus Transfer
108
How does an ABT function?
Rotates to normal or alternate power which has provided power (for Vital equipment only)
109
What does MBT stand for?
Manual Bus Transfer
110
How does an MBT function?
Manual transfer load from normal to alternate, need to physically shift the breaker (Semi-Vital equipment)
111
What is an example of a Vital load?
Anything fed from an ABT
112
What is an example of a Non-Vital load?
Equipment that does not have two sources of power (e.g., Galley equipment)
113
What does PMP stand for?
Power Management Platforms
114
How many PMPs do we have?
4
115
How many shore power cables do we have?
9
116
How many shore power receptacles do we have?
12
117
How many amps is one shore power cable rated at?
400 Amps
118
Where is the Shore Power riser located?
Port side Boat Deck
119
How many shore power breakers are there in Aux 1?
8
120
How many shore power breakers are there in Aux 2?
4
121
What are the four pipe patching methods used?
* EWARP
* Soft patch
* Jubilee
* Banding Patch
122
What does EWARP stand for?
Emergency Water Actuated Repair Patch
123
What PSI can EWARP hold?
150 psi
124
What systems cannot be patched with EWARP?
* FUEL
* STEAM
* POTABLE WATER
125
What does a Soft Patch consist of?
* Wedge
* Gasket
* Marlin
* Oakum
126
What PSI can a Soft Patch hold?
150 psi
127
What PSI can a Jubilee patch hold?
100 psi
128
What is unique about the Jubilee patch?
Can be applied to pressurized systems
129
What are the components of a Banding Patch?
* Gasket
* Steel shole
* Banding
* Banding clip
* Cutter
* Banding tool
130
What PSI can a Banding Patch hold?
150 psi
131
What is the minimal number of bands required for a Banding Patch?
Three
132
Name five portable dewatering equipment
* S-type
* Peri Jet
* Derbishire
* ESP
* P-100
133
Which portable educators are operated by firemain?
* S-type
* Peri Jet
* Derbishire
134
What type of power is used to operate the ESP?
440v
135
Who is authorized to activate the ESP?
Repair Electrician
136
What cannot be passed through the ESP?
* Fuel
* Hot water
* Debris (strainer)
137
How many P-100 pumps do we have?
Three
138
Where are the P-100 pumps located?
* Boat Deck
* STBD & Port quarter deck
139
What type of pump is the P-100 pump?
Centrifugal pump
140
What is the fuel tank capacity on the P-100?
1.45 Gallons
141
What is the rated capacity of the P-100?
20ft suction lift, 100gpm@83psi
142
What is the primary purpose of the P-100?
(Pri) Fire Fighting, (Sec) Dewatering
143
How many spaces are covered by Halon?
Ten
144
What are the spaces covered by Halon?
* AMR1
* AMR2
* MMR1
* MMR2
* FLAM1
* FLAM2
* PAINT MIX
* TROOP FLAM
* JP-5 PUMP ROOM
* HAZARDOUS MATERIAL READY ISSUE
145
What actuates Halon?
5lb CO2 Bottle
146
What systems are actuated by CO2?
* Lights and Horns
* Ventilation and Dampeners
* Time Delay
147
What are the three colors of lights used for Halon?
* White (power available)
* Amber (actuated)
* Red (Halon Discharge)
148
What state is Halon in the bottles?
Liquid State pressurized with nitrogen (600psi)
149
What are the time delays for Halon?
* 30+/-5 sec (unmanned)
* 60+/-10 sec (manned)
150
What is the purpose of the time delay for Halon?
To allow for the vent dampers to close, personnel to evacuate the space
151
How long does it take Halon to cover the space?
Within 10 Seconds
152
What is the scientific name for Halon?
Bromotrifluoromethane
153
What type of FireMain do we have?
Double Horizontal Loop
154
What decks are the FireMain loops on?
2nd deck, 03 Level
155
How many Zebra Valves isolate the FireMain system?
Four
156
Where are the Zebra Valves located?
* Repair 2
* AFT of Armory 2nd deck
* 03 Marine berthing
* FWD Repair 4
157
How many Fire pumps do we have?
Seven
158
What does AFFF stand for?
Aqueous Film Forming Foam
159
How many AFFF Stations do we have?
Four
160
Where are the AFFF Stations located?
* 2nd deck (1-AFT A/C, 2-AFT MMR1 ESCAPE Trunk, 3-FWD Armory, 4-FWD Ships Laundry)
161
How large are the AFFF Tanks?
800 gallons
162
Where are the AFFF refill stations located?
1st Deck above the AFFF Stations
163
What is the purpose of the AFFF Proportioners?
To maintain Concentrate Ratio
164
What is the concentrated ratio for AFFF?
94% Sea Water to 6% AFFF
165
How do you activate the AFFF station?
Two methods: electrical and hydraulic (Manual Control Valve, SOPV)
166
Where can you activate the AFFF stations?
Pushbutton at each AFFF hose reel
167
What does SOPV stand for?
Solenoid Operated Pilot Valve
168
What does AFFF provide to?
* VSA
* VTA
* WELL DECK
* FLIGHT DECK
* MACHINERY ROOM BILGES (AMR&MMR ONLY)
* JP-5 PUMP ROOM
* HOSE REELS
169
What is the purpose of AFFF bilge sprinkling?
To create a FOAM Blanket, Vapor Lock over fuel or oil
170
How many Main Eductors do we have?
Four
171
What are the Main Eductors rated at?
650 GPM
172
Where are the Main Eductors located?
* MMR1
* MMR2
* AMR1
* AMR2
173
What does PECU stand for?
Portable Exothermic Cutting Unit
174
What is the primary use of the PECU?
Accessing spaces to rescue personnel
175
What is the range of a 15lb CO2 Bottle?
4-6 Feet from Horn
176
What is the length of time for continuous use of a 15lb CO2 Bottle?
40 seconds
177
What class of fire is the CO2 Bottle primarily used for?
Charlie Fire
178
What does PKP stand for?
Potassium Bicarbonate
179
What are the two sizes of PKP Bottles?
* 18lb
* 27lb
180
What is the range of an 18lb PKP Bottle?
19 feet
181
What is the range of a 27lb PKP Bottle?
21 feet
182
How long will an 18lb PKP Bottle last with continuous use?
10 seconds
183
How long will a 27lb PKP Bottle last with continuous use?
11 seconds
184
What effect does PKP have on electrical components?
Highly corrosive
185
What class of fire is PKP primarily used for?
Bravo Fire
186
What is the range of a portable 28LB AFFF extinguisher?
15 feet
187
How long will the portable 28LB AFFF extinguisher last with continuous use?
55-65 seconds
188
What class of fire is the portable 28LB AFFF extinguisher primarily used for?
* Alpha
* Bravo Fires
189
How many gallons of foam does the portable 28LB AFFF extinguisher produce?
16 Gallons
190
What does NFTI stand for?
Naval Fire/Fighting Thermal Imager
191
What overhaul gear is in the repair locker?
* Rake
* Shovel
* Halogen
* Axe
* NFTI
192
What does CBR stand for?
Chemical, Biological, Radiation
193
What is a Chemical agent?
A substance that produces lethal or damaging effects on personnel through chemical reactions within the human body
194
What are chemical agents used for?
Weapons of mass destruction to kill, injure, or incapacitate opposing combatant forces
195
What type of detector do we have?
M256A1
196
What does the M256A1 detect?
Nerve, Blister and Blood Agents
197
What paper is used to test for agents?
* M8 Paper
* M9 Paper
198
What do M8/M9 papers detect?
Liquid nerve and blister agents
199
What is the response time for M8/M9 Paper?
* 20 Seconds (M8)
* 10 Seconds (M9)
200
How does M8/M9 paper identify an agent?
Changes color
201
What colors can M8 paper change to and for what?
* Yellow/Green (Nerve)
* Red (Blister)
202
What colors can M9 paper change to?
Some shade of Red, more sensitive than M8
203
What does MOPP stand for?
Mission Oriented Protective Posture
204
What installed chemical detector does USS HARPERS FERRY have?
IDPS-LR
205
What portable Biological Agent Detector do we have onboard?
Dry Filter Unit
206
How long do we have to deliver a sample to shore facility?
24 Hours
207
What type of gas mask is used on the USS Harpers Ferry?
M-50
208
What radiological detector do we have onboard?
* AN-PDQ-1 (IM-265)
* (DT-680)
209
What is the primary purpose of the A/Cs?
Remove heat load from machinery, i.e., electrical equipment
210
What is the purpose of the reefers?
Cool food
211
How many A/Cs are onboard?
6
212
What are the tonnages of A/Cs 1-5?
125 TONS each
213
What is the tonnage of #6 A/C?
130 TONS
214
How many refrigerant plants are onboard?
2
215
What is the tonnage of the reefer plants?
3.5 TONS
216
How many types of refrigerant do we have onboard?
2
217
What type of refrigerant do A/Cs 1-5 use?
R-236FA
218
What type of refrigerant does #6 A/C use?
R-134A
219
What type of refrigerant do the reefer plants use?
R-134A
220
How many places can you steer the ship from?
3
221
What are the locations from which you can steer the ship?
* AFT STEERING
* BRIDGE
* MAIN CONTROL
222
Who mans AFT steering?
Officer, A-Gang member, Electrician, and Helmsman
223
How many ways can you steer the ship in AFT steering?
3
224
What are the ways you can steer the ship in AFT steering?
* Trick Wheel
* Emergency Hand Pump
* Nut & Ratchet
225
What type of oil do we use in the steering system?
2135
226
How many steering gear units are there?
2
227
What does HPU stand for?
Hydraulic Power Unit
228
How many HPUs are there?
5
229
What type of oil do the HPUs use?
2110
230
What are the HPUs used for?
Used to open hydraulic valves inside ballast tanks
231
What does DBAC stand for?
Deballast Air Compressor
232
How many DBACs do we have?
4
233
What are the DBACs used for?
To raise the ship out of the water
234
Where are A/Cs 1, 2, and 3 located?
FWD A/C 3-29-0-E
235
Where are A/Cs 4 and 5 located?
Aft A/C 3-74-1-E
236
Where is #6 A/C located?
3-59-2-E
237
Where is AFT Steering located?
5-134-0-E
238
Where is #1 HPU located?
REEFER DECK 2-23-1
239
Where is #2 HPU located?
MAIN 2 ESCAPE TRUNK 2-63-2
240
Where is #3 HPU located?
INTERMEDIATE SHAFT ALLEY 2-71-1
241
Where is #4 HPU located?
REPAIR 3 2-128-2
242
Where is #5 HPU located?
STBD STERN GATE 2-135-1
243
How many service tanks are there for JP-5?
2
244
What are the locations of the service tanks?
* 6-98-6-J (PORT)
* 6-98-5-J (STBD)
245
What is the service fuel used for?
Only for HELICOPTERS
246
How often are service tanks stripped and tested?
Daily underway
247
How are service tanks filled?
By transfer system from storage tanks
248
What is the capacity of the service tanks?
5310 gallons
249
How many service pumps and filters are there?
1 SERVICE PUMP and 1 SERVICE FILTER
250
What do the helicopter stations get?
FL (Fuel)
251
What is the capacity of the service tanks?
5310 gallons
## Footnote
The service tanks are specifically for storing the cleanest fuel on the ship.
252
What is the primary use of service fuel?
Only for helos
## Footnote
Service fuel is designated for helicopters.
253
How often are service tanks stripped and tested underwater?
Daily
## Footnote
This procedure ensures fuel quality.
254
What is the capacity of the storage tanks that are filled by UNREP/RAS ?
20230 gallons
## Footnote
These tanks are filled by UNREP/RAS.
255
What fuel is stored in the storage tanks?
JP-5 only
## Footnote
JP-5 is a type of aviation fuel.
256
What is the maximum allowable free water in JP-5?
<5 PPM (parts per million)
## Footnote
This limit is crucial for maintaining fuel quality.
257
What is the minimum flash point of JP-5?
140°F
## Footnote
The flash point indicates the fuel's volatility.
258
What is the primary color of JP-5 fuel?
Yellow/Clear
## Footnote
This is a distinguishing feature of JP-5.
259
What does FSII stand for?
Fuel System Icing Inhibitor
## Footnote
FSII prevents freezing of fuel at high altitudes.
260
What is the maximum allowable sediment in JP-5?
2 mg/L
## Footnote
Ensures the cleanliness of the fuel.
261
What type of piping is used for JP-5?
Purple piping
## Footnote
This color coding is used to identify JP-5 systems.
262
What does DFM stand for?
Diesel Fuel Marine (F76)
## Footnote
This fuel is used for LCAC service and small boats.
263
What is the color of DFM fuel?
Golden brown
## Footnote
This is a distinguishing feature of DFM.
264
How often is DFM sampled and tested while LCACs are onboard?
Daily
## Footnote
Regular testing ensures fuel quality.
265
What is the purpose of the stripping system?
Sampling and ridding of settled sediment and free water
## Footnote
Ensures fuel quality and safety.
266
What is the designation for JP-5?
F44
## Footnote
This is the military designation for JP-5 fuel.
267
What is the function of the stripping pump?
Suction from the bottom of all tanks
## Footnote
This helps in sampling and removing contaminants.
268
What are the two types of air compressors mentioned?
H/P air compressor and L/P air compressor
## Footnote
These compressors are essential for various operations.
269
What is the purpose of the engineering duty officer (EDO)?
Oversee engineering operations
## Footnote
The EDO is responsible for the engineering watch.
270
What does the term 'cold iron' refer to?
A state of the ship when not generating power
## Footnote
Indicates that the ship is in a non-operational state.
271
What is the maximum daily water production of the evaporators?
Not specified in the text
## Footnote
This is a crucial aspect of potable water management.
272
What is the purpose of an oily water separator (OWS)?
Separate oil from water to prevent pollution
## Footnote
Essential for environmental compliance.
273
What is the function of the main thrust bearings?
Support the thrust produced by the propeller
## Footnote
Critical for propulsion system stability.
274
What is the purpose of the CPP system?
Control the pitch of the propeller blades
## Footnote
This allows for better maneuverability and efficiency.
275
What is the difference between 60 Hz and 400 Hz power systems?
Frequency of electrical power distribution
## Footnote
60 Hz is standard for general use, while 400 Hz is used for specific applications.
276
What is the maximum allowable sediment in DFM?
Not specified in the text
## Footnote
This is important for fuel quality control.
277
What is the purpose of the fuel oil service pumps?
Transfer fuel to the engines
## Footnote
Integral for propulsion and power generation.
