Aircraft General
1. =: What type of material is primarily used in the construction of the
Boeing 787 Dreamliner airframe? Answer: Carbon fiber reinforced
polymer (CFRP) composite material
2. =: What percentage of the 787's structure is made of composite materials?
Answer: Approximately 50%
3. =: The 787 Dreamliner family currently includes which variants?
Answer: 787-8, 787-9, and 787-10
4. =: What is the maximum seating capacity of the 787-10? Answer: 336
passengers (typical 3-class configuration: 296 passengers)
5. =: What is the maximum range of the 787-9 variant? Answer: 7,635
nautical miles (14,140 km)
6. =: The 787 has a cruising speed of approximately: Answer: Mach 0.85
(488 kts/903 km/h)
7. =: What unique feature does the 787 have regarding its windows
compared to previous commercial aircraft? Answer: Electrochromic
dimmable windows that replace traditional window shades
8. =: The 787 Dreamliner has a wingspan of: Answer: 197 feet (60.1
meters)
9. =: What is the maximum takeoff weight (MTOW) of the 787-8? Answer:
502,500 pounds (227,930 kg)
10.=: The 787 primarily uses which metal in its structure besides composite
materials? Answer: Aluminum alloys
Electrical Systems
11.=: What is the primary generated electrical power voltage on the 787?
Answer: 235 VAC variable frequency
12.=: What is unique about the 787's electrical system compared to
traditional aircraft architectures? Answer: It uses a "more electric
architecture" that replaces many pneumatic and hydraulic systems with
electrical systems
13.=: How many main generators does the 787 have? Answer: Four (two
per engine plus two APU generators)
14.=: What is the total generating capacity of the 787 electrical system?
Answer: Approximately 1.45 megawatts
, 15.=: Which system on the 787 is NOT electrically powered, unlike on many
traditional aircraft? Answer: Primary flight controls (which are
hydraulically powered but electrically signaled)
16.=: The 787 Remote Power Distribution Units (RPDUs) primarily use
which type of protective device? Answer: Solid state power controllers
(SSPCs)
17.=: How many main batteries does the 787 have? Answer: Two
18.=: What type of batteries are used on the 787? Answer: Lithium-ion
batteries
19.=: What major system is NOT electrically powered on the 787? Answer:
Primary hydraulic power generation (engine-driven pumps)
20.=: The 787 electrical system operates on a principle called: Answer: No-
break power transfer
21.=: The Variable Frequency Starter Generator (VFSG) on the 787 can
operate in which modes? Answer: Generator mode and starter mode
22.=: What is the storage capacity of each main battery on the 787? Answer:
Approximately 65 ampere-hours
23.=: The 787's electrical system introduced a new voltage level for
commercial aircraft at: Answer: ±270 VDC
24.=: What is the APU generator rated capacity on the 787? Answer: 225
kVA each
25.=: What powers the 787's electric brakes? Answer: 270 VDC power
system
Environmental Control System (ECS)
26.=: What is unique about the 787's environmental control system
compared to traditional aircraft designs? Answer: It uses electrical
compressors instead of engine bleed air
27.=: What is the nominal cabin altitude on the 787 at its maximum certified
altitude? Answer: 6,000 feet
28.=: The 787 cabin pressurization is controlled by which system? Answer:
Cabin Pressure Control System (CPCS)
29.=: What is the maximum differential pressure in the 787? Answer: 9.4
psi (differential pressure)
30.=: The 787 air conditioning packs are powered by: Answer: Electric
motors
31.=: What is the humidity level maintained in the 787 cabin? Answer: 10-
15% relative humidity (higher than conventional aircraft)
32.=: How many air conditioning packs does the 787 have? Answer: Two
33.=: The 787's cabin environment offers higher humidity because: Answer:
The composite fuselage is less susceptible to corrosion than aluminum
structures
1. =: What type of material is primarily used in the construction of the
Boeing 787 Dreamliner airframe? Answer: Carbon fiber reinforced
polymer (CFRP) composite material
2. =: What percentage of the 787's structure is made of composite materials?
Answer: Approximately 50%
3. =: The 787 Dreamliner family currently includes which variants?
Answer: 787-8, 787-9, and 787-10
4. =: What is the maximum seating capacity of the 787-10? Answer: 336
passengers (typical 3-class configuration: 296 passengers)
5. =: What is the maximum range of the 787-9 variant? Answer: 7,635
nautical miles (14,140 km)
6. =: The 787 has a cruising speed of approximately: Answer: Mach 0.85
(488 kts/903 km/h)
7. =: What unique feature does the 787 have regarding its windows
compared to previous commercial aircraft? Answer: Electrochromic
dimmable windows that replace traditional window shades
8. =: The 787 Dreamliner has a wingspan of: Answer: 197 feet (60.1
meters)
9. =: What is the maximum takeoff weight (MTOW) of the 787-8? Answer:
502,500 pounds (227,930 kg)
10.=: The 787 primarily uses which metal in its structure besides composite
materials? Answer: Aluminum alloys
Electrical Systems
11.=: What is the primary generated electrical power voltage on the 787?
Answer: 235 VAC variable frequency
12.=: What is unique about the 787's electrical system compared to
traditional aircraft architectures? Answer: It uses a "more electric
architecture" that replaces many pneumatic and hydraulic systems with
electrical systems
13.=: How many main generators does the 787 have? Answer: Four (two
per engine plus two APU generators)
14.=: What is the total generating capacity of the 787 electrical system?
Answer: Approximately 1.45 megawatts
, 15.=: Which system on the 787 is NOT electrically powered, unlike on many
traditional aircraft? Answer: Primary flight controls (which are
hydraulically powered but electrically signaled)
16.=: The 787 Remote Power Distribution Units (RPDUs) primarily use
which type of protective device? Answer: Solid state power controllers
(SSPCs)
17.=: How many main batteries does the 787 have? Answer: Two
18.=: What type of batteries are used on the 787? Answer: Lithium-ion
batteries
19.=: What major system is NOT electrically powered on the 787? Answer:
Primary hydraulic power generation (engine-driven pumps)
20.=: The 787 electrical system operates on a principle called: Answer: No-
break power transfer
21.=: The Variable Frequency Starter Generator (VFSG) on the 787 can
operate in which modes? Answer: Generator mode and starter mode
22.=: What is the storage capacity of each main battery on the 787? Answer:
Approximately 65 ampere-hours
23.=: The 787's electrical system introduced a new voltage level for
commercial aircraft at: Answer: ±270 VDC
24.=: What is the APU generator rated capacity on the 787? Answer: 225
kVA each
25.=: What powers the 787's electric brakes? Answer: 270 VDC power
system
Environmental Control System (ECS)
26.=: What is unique about the 787's environmental control system
compared to traditional aircraft designs? Answer: It uses electrical
compressors instead of engine bleed air
27.=: What is the nominal cabin altitude on the 787 at its maximum certified
altitude? Answer: 6,000 feet
28.=: The 787 cabin pressurization is controlled by which system? Answer:
Cabin Pressure Control System (CPCS)
29.=: What is the maximum differential pressure in the 787? Answer: 9.4
psi (differential pressure)
30.=: The 787 air conditioning packs are powered by: Answer: Electric
motors
31.=: What is the humidity level maintained in the 787 cabin? Answer: 10-
15% relative humidity (higher than conventional aircraft)
32.=: How many air conditioning packs does the 787 have? Answer: Two
33.=: The 787's cabin environment offers higher humidity because: Answer:
The composite fuselage is less susceptible to corrosion than aluminum
structures
