B757-200
Flight Crew Air Transport Pilot (ATP)
Confusion; Troubleshooting; Training / Qualification
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural Maintenance; Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
Aircraft; Procedure
This report falls into a gray area from the Flight Operations Manual requirement to report flight control malfunctions. We did not need to get into QRH. However; the elevators had a 'split elevator' condition. The left elevator indicated higher than the right (or vice versa). This required a higher than normal aileron trim (approximately 1.5 - 2 units) to achieve coordinated flight; referencing the slip/skid indicator. (Rarely; does the 757 require aileron trim; and I've never seen a 'split elevator' condition on the 757). Upon landing; we annotated the discrepancy in the logbook and sent pictures of the PFD taken from cruise flight to facilitate Maintenance correcting the condition. These photos were forwarded to Maintenance. It appears that the flight controls we're not rigged correctly and they were fighting each other. As well as burning more fuel than an aircraft properly rigged.
A B757-200 Captain reported a split elevator condition detected because of the unusual aileron trim; then verified by the PFD indications.