Boeing (Chicago, Seattle, Wichita and Charleston) has completed the power on sequence for the new 747-8 Intercontinental. This milestone enables the program to begin functional tests on the airplane.
Power on is a complex series of tasks that methodically energize and activate the airplane’s systems. In this critical stage of the assembly process, the electrical, hydraulic and pneumatic systems are brought on line.
Mechanics connected the 747-8 to an external power cart to energize the flight-deck display and maintenance systems. The electricity coursing through the airplane’s 133 miles (214 km) of wire will be as high as 105 kilovoltampere (kVa).
The program also activated the airplane’s hydraulic and pneumatic systems. Pressurized to 3,000 pounds per square inch (psi), the hydraulics power the flight control surfaces, landing gear, brakes and steering systems. The 160 psi applied to the pneumatic system enables the airplane to operate the environmental control systems and the leading-edge flaps.
A video that gives you an inside look at the power on sequence is available at
Copyright Photo: Nick Dean. Please click on the photo for additional details.