B777-200
Maintenance Airframe; Maintenance Powerplant
Communication Breakdown; Situational Awareness; Training / Qualification
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Ground Event / Encounter Other / Unknown
General Maintenance Action
Equipment / Tooling; Company Policy; Human Factors; Procedure
On arrival to Gate after taxi; requested external electric connection. Lead Mechanic connected one [electrical power] line. I asked for second; and Lead Mechanic indicated second [power line] was Out of Service (OTS). I explained B-777 requires two external connections; he said he'd never heard this; but after a discussion agreed to get a gas-powered Generator KILOVOLT-AMPERES (KVA) to provide second source of [electrical] power.  [Recommend] adding to Ground Handling Manual that two external power connections are required. Remind/train all Ramp and Maintenance [Personnel] on minimum requirements of B-777 to have two external connections. Provide two KVA connections at ALL B-777 capable gates. (Currently several B-777 gates at ZZZ only have one [electrical power] cable connection.). Training; Documents and Maintenance Bulletins. Evening shift.
A Line Aircraft Maintenance Technician (AMT) reports about his air carrier not making available a minimum of two external power electrical cords at many of their terminal gates that service their B-777 aircraft. He also recommends adding that information to their Ramp and Maintenance Aircraft Training; documentation; and Maintenance Bulletins.