B767-200
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural MEL / CDL; Deviation / Discrepancy - Procedural Published Material / Policy
General Flight Cancelled / Delayed; General Maintenance Action
Aircraft; Procedure; Manuals; MEL
Dispatched with deferred EEC's (Electronic Engine Control). After start on both Block Turn Backs (BTBs); EICAS Message of L ENG EEC PROBE; EEC PROBE Discreet light and MACH PROBE Discreet light. Also had related status message on both BTBs.Also; not related to BTBs; but interesting to note: Although manuals have full takeoff power requirement; TLR (Thrust Lever Reading); with EECs deferral noted; show ATM power settings. Recommend live calculation for max power takeoff; insuring deferral taken into account. Company informed this date through the incident report.Verify maximum power takeoff is indeed a necessary requirement. If so; either live calculate every takeoff or reprogram TLR for this MEL item. Discontinue TLR; using only live calculation until this is resolved.
B767 Captain reported two block turn backs caused by deferred maintenance; resulting in a flight delay.