An ACR B737-200 flight crew experienced an autopilot disengagement, leading edge flaps amber in transit light, and altimeter discrepancies during cruise.

Narrative

Rewritten in plain English from NASA’s original all-caps telegraphic report — facts, figures, and terminology preserved.

While at cruise at flight level 350, our aircraft disengaged the autopilot and locked out the autopilot from being re-engaged. I (pilot flying) started hand flying.

We also got a leading edge flaps amber in transit light with a slight roll to the right -- easily countered with aileron/rudder. All gauges for flaps (trailing edge flaps) and leading edge flaps indicated normal; but roll was coming from somewhere. Captain's and co-pilot's altimeters were noticed to be 200-250 feet different. I flew level flight on the captain's altimeter.

ZME queried our altitude which they reported flight level 353; which was the first officer's altimeter setting. After a couple more checks with control; we decided to fly off the first officer's side. Uneventful rest of the flight. We feel that an electrical hiccup caused the malfunction somehow. Our performance data computer has repeat write-ups in the book. Related? Leading edge flaps lights disengaging the autopilot? Our maintenance coordinator did not have an answer.

Callback conversation with reporter revealed the following info: The reporter said that the maintenance personnel never told him what caused the leading edge device to deploy or the captain's altimeter to suddenly malfunction. He said that when the flight crew attempted to determine which leading edge device was unlocked the individual device display showed everything was normal. However; the amber leading edge device in transit light remained on and the aircraft still had a roll moment to the right.