747-8:
What's a 3 engine ferry on a 747?
After the station engineering department confirms that a single engine has failed.
Would then require changing but resources are not available at the subject station or logistics warrant the aircraft to fly as a '3 engined ferry'.
The station engineers then have a procedure in conjuction with data analysis from maintenance control to carry out detailed inspections to the remaining three engines, wheel and braking systems and to closely review all remaining ADD's.
To lock the inop engine and do any other blanking and specific checks as required.
The flight crew maybe required to do simulator training prior to the three engine take-off.
The aircraft would then depart with no passengers onboard to destination as a 3 engined ferry flight.
TW