Boeing 777 KSV
Q1. What is the primary purpose of the 777's fly-by-wire flight control
system?
A) To reduce pilot workload by automating all flight functions
B) To transmit pilot control inputs electronically to flight control
surfaces
C) To replace hydraulic systems entirely with electrical systems
D) To provide autopilot functionality during all phases of flight
✓ Correct Answer: B
Explanation: The 777's fly-by-wire system converts pilot control inputs into
electronic signals that are sent to flight control computers, which then command
hydraulic actuators to move the flight control surfaces. It does not replace
hydraulics or automate all functions.
Q2. The Boeing 777 uses how many primary flight control computers
(PFCCs)?
A) Two
B) Three
C) Four
D) Five
✓ Correct Answer: B
Explanation: The 777 has three Primary Flight Control Computers (PFCCs)
arranged in a triplex configuration for redundancy. Each PFCC operates on
different software and hardware to ensure that a single failure cannot affect all
three computers simultaneously.
Q3. Which hydraulic system powers the 777's primary flight controls if two
hydraulic systems fail?
, A) The RAT (Ram Air Turbine) provides backup hydraulic pressure
B) The electrical backup hydraulic actuators (EBHAs) take over
C) The aircraft becomes uncontrollable
D) The cargo door actuators redirect pressure to flight controls
✓ Correct Answer: B
Explanation: The 777 is equipped with Electrical Backup Hydraulic Actuators
(EBHAs) on critical surfaces. If two hydraulic systems fail, the EBHAs use
electrical power to drive their own internal hydraulic pump to move the control
surfaces.
Q4. What does the term 'envelope protection' mean in the context of the
777's flight control system?
A) Protection of the aircraft's documents during flight
B) Prevention of the aircraft from exceeding certified structural and
aerodynamic limits
C) A firewall system protecting avionics from electromagnetic interference
D) The pressurization envelope maintained by cabin management systems
✓ Correct Answer: B
Explanation: Envelope protection is a function of the fly-by-wire system that
prevents pilots from commanding maneuvers that would exceed the aircraft's
structural or aerodynamic design limits, such as excessive bank angle, pitch, or
load factor.
Q5. On the Boeing 777, the flight spoilers serve which dual purpose?
A) Speed brakes and roll augmentation
B) Drag devices and pitch augmentation
C) Lift dumpers and yaw control
D) Ground spoilers only and stall warning
✓ Correct Answer: A
Explanation: The 777's flight spoilers function both as speed brakes (to increase
drag and reduce speed) and as roll augmentation devices (they extend
asymmetrically on the descending wing to assist the ailerons in rolling the
aircraft).
Q6. What is the purpose of the 777's load alleviation function?
A) To reduce cabin noise during turbulence
B) To automatically deploy spoilers to reduce wing structural loads
during gusts
C) To redistribute fuel between tanks to balance the aircraft
, D) To reduce landing gear loads during touchdown
✓ Correct Answer: B
Explanation: The load alleviation function uses the flight control computers to
automatically deflect spoilers and ailerons to reduce bending loads on the wing
structure when the system detects excessive gust loads, improving structural
fatigue life.
Q7. The 777's triple hydraulic systems are designated:
A) Left, Center, Right
B) Primary, Secondary, Tertiary
C) A, B, C
D) 1, 2, 3
✓ Correct Answer: A
Explanation: The Boeing 777 has three independent hydraulic systems
designated Left, Center, and Right. Each operates at 3,000 psi and each is
powered by different sources to ensure redundancy.
Q8. What powers the 777's center hydraulic system on the ground?
A) Only the engine-driven pumps
B) Electrically-driven pumps and/or engine-driven pumps
C) A dedicated auxiliary power unit hydraulic pump
D) Ram air turbine only
✓ Correct Answer: B
Explanation: The center hydraulic system on the 777 can be pressurized by AC
motor-driven pumps (electrically powered) and by engine-driven pumps when
engines are running. This dual-source design ensures availability in various
operational configurations.
Q9. What is the operating pressure of the Boeing 777 hydraulic systems?
A) 1,500 psi
B) 2,000 psi
C) 3,000 psi
D) 5,000 psi
✓ Correct Answer: C
Explanation: All three hydraulic systems on the Boeing 777 operate at 3,000 psi
(pounds per square inch), which is standard for large commercial transport
aircraft of this generation.
, Q10. The 777's air-driven demand pump in the center hydraulic system is
activated by:
A) Pilot selection via a cockpit switch
B) Automatic activation when system pressure drops below a threshold
C) Ground crew via a maintenance panel
D) The flight management computer during approach
✓ Correct Answer: B
Explanation: The air-driven demand pump (ADDP) in the center hydraulic
system activates automatically when hydraulic system pressure drops below a
set threshold, providing additional hydraulic flow on demand without pilot action.
Section 2: Engines & Powerplant
Q11. The Boeing 777-200ER is certified to fly with which engine options?
(Select the correct grouping)
A) GE90, Pratt & Whitney PW4000, Rolls-Royce Trent 800
B) CFM56, GE90, IAE V2500
C) GE9X, Trent XWB, PW1000G
D) GE90-115B only
✓ Correct Answer: A
Explanation: The Boeing 777-200ER was certified with three engine options: the
GE90 (General Electric), PW4000 (Pratt & Whitney), and Trent 800 (Rolls-
Royce), giving airlines choice of powerplant from competing manufacturers.
Q12. What engine exclusively powers the Boeing 777-300ER and 777-
200LR?
A) Rolls-Royce Trent 800
B) Pratt & Whitney PW4098
C) General Electric GE90-115B
D) CFM International CFM56-7B
✓ Correct Answer: C
Explanation: The GE90-115B is the exclusive engine for the 777-300ER and
777-200LR variants. With a fan diameter of approximately 128 inches, it was the
world's most powerful commercial jet engine at its introduction, producing over
115,000 lbs of thrust.
Q13. What does ETOPS stand for and what is the 777's initial ETOPS
rating?
Q1. What is the primary purpose of the 777's fly-by-wire flight control
system?
A) To reduce pilot workload by automating all flight functions
B) To transmit pilot control inputs electronically to flight control
surfaces
C) To replace hydraulic systems entirely with electrical systems
D) To provide autopilot functionality during all phases of flight
✓ Correct Answer: B
Explanation: The 777's fly-by-wire system converts pilot control inputs into
electronic signals that are sent to flight control computers, which then command
hydraulic actuators to move the flight control surfaces. It does not replace
hydraulics or automate all functions.
Q2. The Boeing 777 uses how many primary flight control computers
(PFCCs)?
A) Two
B) Three
C) Four
D) Five
✓ Correct Answer: B
Explanation: The 777 has three Primary Flight Control Computers (PFCCs)
arranged in a triplex configuration for redundancy. Each PFCC operates on
different software and hardware to ensure that a single failure cannot affect all
three computers simultaneously.
Q3. Which hydraulic system powers the 777's primary flight controls if two
hydraulic systems fail?
, A) The RAT (Ram Air Turbine) provides backup hydraulic pressure
B) The electrical backup hydraulic actuators (EBHAs) take over
C) The aircraft becomes uncontrollable
D) The cargo door actuators redirect pressure to flight controls
✓ Correct Answer: B
Explanation: The 777 is equipped with Electrical Backup Hydraulic Actuators
(EBHAs) on critical surfaces. If two hydraulic systems fail, the EBHAs use
electrical power to drive their own internal hydraulic pump to move the control
surfaces.
Q4. What does the term 'envelope protection' mean in the context of the
777's flight control system?
A) Protection of the aircraft's documents during flight
B) Prevention of the aircraft from exceeding certified structural and
aerodynamic limits
C) A firewall system protecting avionics from electromagnetic interference
D) The pressurization envelope maintained by cabin management systems
✓ Correct Answer: B
Explanation: Envelope protection is a function of the fly-by-wire system that
prevents pilots from commanding maneuvers that would exceed the aircraft's
structural or aerodynamic design limits, such as excessive bank angle, pitch, or
load factor.
Q5. On the Boeing 777, the flight spoilers serve which dual purpose?
A) Speed brakes and roll augmentation
B) Drag devices and pitch augmentation
C) Lift dumpers and yaw control
D) Ground spoilers only and stall warning
✓ Correct Answer: A
Explanation: The 777's flight spoilers function both as speed brakes (to increase
drag and reduce speed) and as roll augmentation devices (they extend
asymmetrically on the descending wing to assist the ailerons in rolling the
aircraft).
Q6. What is the purpose of the 777's load alleviation function?
A) To reduce cabin noise during turbulence
B) To automatically deploy spoilers to reduce wing structural loads
during gusts
C) To redistribute fuel between tanks to balance the aircraft
, D) To reduce landing gear loads during touchdown
✓ Correct Answer: B
Explanation: The load alleviation function uses the flight control computers to
automatically deflect spoilers and ailerons to reduce bending loads on the wing
structure when the system detects excessive gust loads, improving structural
fatigue life.
Q7. The 777's triple hydraulic systems are designated:
A) Left, Center, Right
B) Primary, Secondary, Tertiary
C) A, B, C
D) 1, 2, 3
✓ Correct Answer: A
Explanation: The Boeing 777 has three independent hydraulic systems
designated Left, Center, and Right. Each operates at 3,000 psi and each is
powered by different sources to ensure redundancy.
Q8. What powers the 777's center hydraulic system on the ground?
A) Only the engine-driven pumps
B) Electrically-driven pumps and/or engine-driven pumps
C) A dedicated auxiliary power unit hydraulic pump
D) Ram air turbine only
✓ Correct Answer: B
Explanation: The center hydraulic system on the 777 can be pressurized by AC
motor-driven pumps (electrically powered) and by engine-driven pumps when
engines are running. This dual-source design ensures availability in various
operational configurations.
Q9. What is the operating pressure of the Boeing 777 hydraulic systems?
A) 1,500 psi
B) 2,000 psi
C) 3,000 psi
D) 5,000 psi
✓ Correct Answer: C
Explanation: All three hydraulic systems on the Boeing 777 operate at 3,000 psi
(pounds per square inch), which is standard for large commercial transport
aircraft of this generation.
, Q10. The 777's air-driven demand pump in the center hydraulic system is
activated by:
A) Pilot selection via a cockpit switch
B) Automatic activation when system pressure drops below a threshold
C) Ground crew via a maintenance panel
D) The flight management computer during approach
✓ Correct Answer: B
Explanation: The air-driven demand pump (ADDP) in the center hydraulic
system activates automatically when hydraulic system pressure drops below a
set threshold, providing additional hydraulic flow on demand without pilot action.
Section 2: Engines & Powerplant
Q11. The Boeing 777-200ER is certified to fly with which engine options?
(Select the correct grouping)
A) GE90, Pratt & Whitney PW4000, Rolls-Royce Trent 800
B) CFM56, GE90, IAE V2500
C) GE9X, Trent XWB, PW1000G
D) GE90-115B only
✓ Correct Answer: A
Explanation: The Boeing 777-200ER was certified with three engine options: the
GE90 (General Electric), PW4000 (Pratt & Whitney), and Trent 800 (Rolls-
Royce), giving airlines choice of powerplant from competing manufacturers.
Q12. What engine exclusively powers the Boeing 777-300ER and 777-
200LR?
A) Rolls-Royce Trent 800
B) Pratt & Whitney PW4098
C) General Electric GE90-115B
D) CFM International CFM56-7B
✓ Correct Answer: C
Explanation: The GE90-115B is the exclusive engine for the 777-300ER and
777-200LR variants. With a fan diameter of approximately 128 inches, it was the
world's most powerful commercial jet engine at its introduction, producing over
115,000 lbs of thrust.
Q13. What does ETOPS stand for and what is the 777's initial ETOPS
rating?
