B777 Balance And Servicing
The 'B777 Balance and Servicing' quiz assesses knowledge on key maintenance aspects of the Boeing 777 aircraft. It covers topics such as crossbleed start, ground handling, fuel crossfeed, hydraulic systems, and braking capabilities, crucial for maintenance and operational efficiency.
- 1.
What is the minimum duct pressure for starting when performing a crossbleed start?
- A.
15 PSI
- B.
25 PSI
- C.
45 PSI
- D.
55 PSI
Correct Answer
B. 25 PSIExplanation
The minimum duct pressure required for starting when performing a crossbleed start is 25 PSI. This means that the air pressure in the duct must be at least 25 PSI in order to successfully initiate the start process.Rate this question:
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- 2.
When can the ground handling bus be powered?
- A.
On the ground, with either APU or external power available.
- B.
Only when the APU is running while on the ground
- C.
Either on the ground or in flight, with APU power available.
- D.
On the ground, with the ground service switch selected.
Correct Answer
A. On the ground, with either APU or external power available.Explanation
The ground handling bus can be powered when the aircraft is on the ground and either the APU (Auxiliary Power Unit) or external power is available. This means that the bus can be powered by either the onboard APU or by an external power source connected to the aircraft. It is important to have the ground handling bus powered during ground operations to provide electrical power for various equipment and systems, such as loading and unloading cargo, servicing the aircraft, and other ground handling operations.Rate this question:
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- 3.
Which statement is true regarding fuel crossfeed?
- A.
Crossfeed valves are normally open, providing fuel feed from tank to engine.
- B.
Although there are two valves, only open crosfeed valve is required for successful crossfeed operatrion.
- C.
There is only one crossfeed valve even though there are two switches to control it.
- D.
Fuel crossfeed can only be accomplished in the air.
Correct Answer
B. Although there are two valves, only open crosfeed valve is required for successful crossfeed operatrion.Explanation
Fuel crossfeed is a process in which fuel is transferred from one tank to another during flight. In this case, the correct answer states that although there are two valves, only the open crossfeed valve is required for successful crossfeed operation. This means that if one of the valves is closed or not functioning, the crossfeed operation can still be achieved as long as the open valve is functioning properly. This information suggests that both valves do not need to be open simultaneously for fuel crossfeed to occur.Rate this question:
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- 4.
What indicates that a hydraulic reservoir needs refilling?
- A.
EICAS message REFILL HYD RES
- B.
Hydraulic quantity displayed less than .75 on the status display
- C.
A white RF next to the hydraulic quantity on the status display
- D.
Hydraulic quantity displayed less than .75 the CDU.
Correct Answer
C. A white RF next to the hydraulic quantity on the status displayExplanation
A white RF next to the hydraulic quantity on the status display indicates that the hydraulic reservoir needs refilling.Rate this question:
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- 5.
What braking power is available with brake accumulator pressure as the only source of braking?
- A.
Twelve or more full brake applications
- B.
Several braking applications or parking brake applications
- C.
Fully charged,3000 PSI available
- D.
Greater than 1475 PSI available
Correct Answer
B. Several braking applications or parking brake applicationsExplanation
The correct answer is "Several braking applications or parking brake applications". This means that the brake accumulator pressure can provide enough braking power for multiple instances of braking or for engaging the parking brake.Rate this question:
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- 6.
Which of the following is NOT a crucial factor to consider when selecting an aircraft tire for a specific aircraft?
- A.
Tire size and dimensions, matching the aircraft's wheel assembly.
- B.
Tire ply rating, indicating the tire's strength and load-carrying capacity.
- C.
Tire tread pattern, suitable for the intended operating conditions.
- D.
Tire brand and color, matching the aircraft's livery and aesthetic preferences.
Correct Answer
D. Tire brand and color, matching the aircraft's livery and aesthetic preferences.Explanation
While aesthetics might be a minor consideration, the primary factors for tire selection are size, ply rating, and tread pattern. These ensure proper fit, load-carrying capacity, and performance in various conditions.Rate this question:
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- 7.
After application of de-icing fluids to the exterior of the airplane, how long should you wait before restoring normal Engine and APU bleed air operation?
- A.
Approximately 1 minute
- B.
3 minutes
- C.
5 minutes
- D.
None, normal bleed air operation is allowed during de-icing procedures.
Correct Answer
A. Approximately 1 minuteExplanation
After the application of de-icing fluids to the exterior of the airplane, it is recommended to wait for approximately 1 minute before restoring normal Engine and APU bleed air operation. This waiting period allows the de-icing fluids to properly remove any ice or frost buildup on the aircraft's surfaces. Restoring normal bleed air operation too soon may result in the fluids not being effective in removing all the ice or frost, which could potentially affect the aircraft's performance and safety.Rate this question:
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- 8.
At what fuel quantity would the fuel imbalance pointer be displayed?
- A.
Main tank fuel differs more than 1000 pounds (500 kg).
- B.
Main tank fuel offers by more than 200 pounds (100 kg) and the crossfeed valve is open
- C.
Fuel difference between any tank is greater than 1000 pounds (500kg)
- D.
Main tank fuel differs more than 1000 pounds (500 kg) or the main tank fuel differs more than 200 pounds (100kg) and a crossfeed valve is open.
Correct Answer
D. Main tank fuel differs more than 1000 pounds (500 kg) or the main tank fuel differs more than 200 pounds (100kg) and a crossfeed valve is open.Explanation
The fuel imbalance pointer would be displayed when the main tank fuel differs more than 1000 pounds (500 kg) or when the main tank fuel differs more than 200 pounds (100 kg) and a crossfeed valve is open. This means that if there is a significant difference in fuel quantity between the main tanks or if there is a smaller difference but the crossfeed valve is open, the fuel imbalance pointer will be displayed to indicate the fuel imbalance.Rate this question:
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- 9.
With a combination of light gross weight and aft CG, what considerations should the pilot take to improve take-off controllability?
- A.
None. The airplane automatically compensates
- B.
Use reduced thrust combined with a rolling takeoff
- C.
Use maximum take-off thrust
- D.
Use 1 additional unit of nose down trim
Correct Answer
B. Use reduced thrust combined with a rolling takeoffExplanation
When the aircraft has a light gross weight and an aft center of gravity (CG), it can result in reduced controllability during takeoff. To improve the controllability, the pilot should use reduced thrust combined with a rolling takeoff. This means using less power during the takeoff and initiating the rotation smoothly to prevent any sudden pitch changes. This technique helps in maintaining better control over the aircraft during the critical phase of takeoff, ensuring a safer and more stable departure.Rate this question:
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- 10.
Take of stabilizer trim setting is computed by the FMC using which of the following?
- A.
Only the airplane gross weight
- B.
CG and runway length
- C.
CG, gross weight, and take-off thrust
- D.
CG and takeoff thrust
Correct Answer
C. CG, gross weight, and take-off thrustExplanation
The FMC (Flight Management Computer) computes the takeoff stabilizer trim setting using the aircraft's center of gravity (CG), gross weight, and takeoff thrust. These factors are crucial in determining the appropriate trim setting for a safe and balanced takeoff. The CG affects the aircraft's stability and balance, while the gross weight and takeoff thrust impact the aircraft's performance during takeoff. By considering all three factors, the FMC ensures that the stabilizer trim setting is optimized for a successful takeoff.Rate this question:
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- 11.
What indicates that the engine oil quality is low?
- A.
Oil quantity less than 19 quarts (15 liters)
- B.
EICAS message OIL QUANTITY LOW
- C.
A magenta LO indication on the Status page
- D.
A white LO indication on the secondary engine display
Correct Answer
D. A white LO indication on the secondary engine displayExplanation
A white LO indication on the secondary engine display indicates that the engine oil quality is low.Rate this question:
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- 12.
What is the first step to take when a fuel imbalance exist between the right and left main tasks and fuel balancing is required?
- A.
Fuel pump switches (low tank)……Off
- B.
Crossfeed switches (either)………On
- C.
Crossfeed switches (either)………..Off
- D.
Fuel pump switches (low tank)…….On
Correct Answer
B. Crossfeed switches (either)………OnExplanation
When a fuel imbalance exists between the right and left main tanks and fuel balancing is required, the first step to take is to turn on the crossfeed switches. This allows fuel to be transferred between the tanks, helping to equalize the fuel levels.Rate this question:
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- 13.
What does the FMS CDU message FUEL DISAGREE-PROG 2/3 indicate?
- A.
The predicate fuel at destination is less than the FMC pilot entered reserves.
- B.
The fuel quantity is low in either main tank.
- C.
There is a fuel imbalance between the main tanks.
- D.
The totalizer fuel quantity and the FMC calculated disagree by 9000 pounds (4080 kilograms) for more than 5 minutes.
Correct Answer
D. The totalizer fuel quantity and the FMC calculated disagree by 9000 pounds (4080 kilograms) for more than 5 minutes.Explanation
The FMS CDU message "FUEL DISAGREE-PROG 2/3" indicates that there is a disagreement between the totalizer fuel quantity and the FMC calculated fuel quantity. This disagreement is by 9000 pounds (4080 kilograms) and has been ongoing for more than 5 minutes.Rate this question:
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- 14.
What are the fuel tank capacities?
- A.
Each main tank contains 62,300 pounds and the center tank contains 83,100 pounds.
- B.
Each main tank contains 83,100 pounds and the center tank contains 62,300 pounds.
- C.
Each main tank contains 64,100 pounds and the center tank contains 174,900 pounds.
- D.
Each main tank contains 69,000 pounds and the center tank contains 182,000 pounds.
Correct Answer
C. Each main tank contains 64,100 pounds and the center tank contains 174,900 pounds. -
- 15.
Which of the following is NOT a typical step in the process of balancing and servicing an aircraft tire?
- A.
Inspecting the tire for wear and tear, cuts, or bulges.
- B.
Inflating the tire to the correct pressure.
- C.
Removing the tire from the wheel and inspecting the wheel for damage.
- D.
Replacing the tire with a new one every 50 flight hours.
Correct Answer
D. Replacing the tire with a new one every 50 flight hours.Explanation
While regular inspection and maintenance are crucial for aircraft tire safety, replacing tires every 50 flight hours is not a standard practice. Tires are typically replaced based on wear and tear, damage, or reaching a specified number of landings, not solely on flight hours.Rate this question:
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- 16.
When does the EICAS message APU LIMIT display?
- A.
When the APU has increased EGT
- B.
When the APU has increased oil temperature or reduced oil pressure
- C.
When APU operation has exceeded a limit
- D.
When the APU has automatically shut down for exceeding a limit
Correct Answer
C. When APU operation has exceeded a limitExplanation
The EICAS message APU LIMIT displays when the APU operation has exceeded a limit. This means that the APU has been running for a longer period of time or at a higher power output than it is designed for. This could be due to various factors such as excessive heat buildup, increased oil temperature, reduced oil pressure, or any other condition that could potentially damage the APU. The display of this message serves as a warning to the pilot or maintenance personnel to take appropriate action to prevent further damage or potential failure of the APU.Rate this question:
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Jan 15, 2025Quiz Edited by
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Feb 19, 2011Quiz Created by
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