2000-01-26: ARN897 BA46
departing Halifax for Montreal reported a gear problem 2 nm north west of Halifax. Pilot requested a return to Halifax. No assistance required. Aircraft landed at 2352. This aircraft was involved in a similar occurence earlier in the afternoon. Nil TSB Update: The first event CADOR 2000A0044 was a return to Halifax because the gear would not come back up after take-off (even with another cycle). In Halifax, maintenance tried to reproduce the problem, did several gear swings, inspected for ice/slush, inspected all associated wiring, sensors, up-locks, and gaps. No fault found. When aircraft departed (CADOR 2000A0045) the next time, the exact same problem was encountered and they returned to Halifax again. Maintenance, as part of their trouble shooting, worked back through previous maintenance actions (night before) and found that one of the gear area panels had been swapped from another aircraft. Although this should not have had any such effect, they investigate this issue. Inspection still revealed no problems. The maintenance crew then physically pushed on the panel when doing gear swings to try and duplicate the effects of air/wind load on the panel in flight. They discovered that there was a reduction in the gap between the panel and gear. When hand pressure was applied, and they successfully reproduced the fault. They shaved back the panel (minute amount made the difference) and this rectified the problem. Appears to be a "one-of" combination of a certain aircraft and panel resulting in a slight change in the gap with wind load. They went back and checked the aircraft that was involved in the original panel swap and all checked out fine (gap clearance). Information on file MAH Moncton.