Robert L. Swaim National Resource Specialist Aircraft Systems Engineering National Resource Specialist Aircraft Systems Engineering.

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Presentation transcript:

Robert L. Swaim National Resource Specialist Aircraft Systems Engineering National Resource Specialist Aircraft Systems Engineering

Aft Rig Pin Installed in Ground Tests (First AMM Deviation) Aft Rig Pin Hole

Control Yoke Rig Pin Hole In Floor Structure Rig Pin Hole In Bellcrank (View from aft) (View from forward) Forward Rig Pin May Miss Bellcrank (Second AMM Deviation)

Tighten Control Cables (Third AMM Deviation) Elevator-Down Cable Elevator-Up Cable Elevator-Down Cable Elevator-Up Cable 1. Aft rig pin installed 2. Forward rig pin missed bellcrank 3. Tighten elevator-up cable.

Side of Bellcrank Stopped At Improperly Installed Rig Pin. (Pin should be inserted in bellcrank hole.) Tightening Elevator-Down Cable Moved Forward Bellcrank Aft

Cable Misrig Altered Relation Between FDR Sensor and Elevator Elevator-Down Cable Elevator-Up Cable Rig pin holds elevator In one position Turnbuckles alter overall cable lengths FDR senses shift in column position

Colgan Accident CommutAir Incident (Similar airplane)

Functional Inspections Should Be Required for Critical Maintenance

Robert L. Swaim National Resource Specialist Aircraft Systems Engineering National Resource Specialist Aircraft Systems Engineering

Pitch Trim Cable Drum Illustration Colgan Air Flight 9446 Investigation

Capt yoke full aft Capt yoke full fwd Capt yoke mid position Fwd bellcrank access

Pitch Control Turnbuckles Found In Wreckage 7.30 Inches Aircraft Nose Down (AND) 5.54 Inches Aircraft Nose Up (ANU)