B777 Balance And Servicing

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.

A white RF next to the hydraulic quantity on the status display indicates that the hydraulic reservoir needs refilling.

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.

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.

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.

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.

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.

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.

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.

A white LO indication on the secondary engine display indicates that the engine oil quality is low.

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.

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.

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.

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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.

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.