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Printed page 17. PDF page 31.
Aircraft Accident Report Figure 1. Q400 Indicated Airspeed Display Source: Bombardier. The ice protection panel, which is located on the overhead panel on the captain's side of the cockpit, includes a "REF SPEEDS" switch that can be set to theOpen final report at PDF page 31NTSB AAR-10/01: Loss of control on approach, Colgan Air 3407
Printed page 18. PDF page 32.
Reference Speeds Switch Source: Bombardier. The Bombardier Q400 AFM, section 4.7.2, Ice Protection Procedures, dated July 13, 2005, stated that the ref speeds switch was to be in the increase position before entering icing conditions and in the off positionOpen final report at PDF page 32NTSB AAR-10/01: Loss of control on approach, Colgan Air 3407
Printed page 21. PDF page 35.
leading edge of each propeller blade to remove ice accumulations. A rotary switch on the ice protection panel is used to select propeller heat. Both front windshields and the pilot's side window have electronically controlled heater elements that are laminatedOpen final report at PDF page 35NTSB AAR-10/01: Loss of control on approach, Colgan Air 3407
Printed page 27. PDF page 41.
the root of the blades (where the blades are installed into the propeller hub). The ice protection panel was recovered in the wreckage and was found to be severely burned. As indicated in section 1.6.2, the ref speeds switch wasOpen final report at PDF page 41NTSB AAR-10/01: Loss of control on approach, Colgan Air 3407
Printed page 42. PDF page 56.
were allowed). 1.17.2.2 Operations in Icing Conditions The Q400 AFM, section 4.7.2, Ice Protection Procedures, dated July 13, 2005, included the following information about operations in icing conditions:116 � For takeoff into icing conditions, the engine intake door,Open final report at PDF page 56NTSB AAR-10/01: Loss of control on approach, Colgan Air 3407
Printed page 43. PDF page 57.
airspeeds are to resume. In addition, several airplane systems on the Q400, including the ice protection system, required daily checks. The Colgan CFM, section 5, "Expanded Checklist," dated May 20, 2008, explained that the following items were to be checkedOpen final report at PDF page 57NTSB AAR-10/01: Loss of control on approach, Colgan Air 3407