Document ID: chunk:federal_register_of_legislation:F2009L03904:body:0:p2
Version: federal_register_of_legislation:F2009L03904
Segment Type: other
Provision Reference: 
Character Range: 2955–6061

2009, also meets the intent of Requirement 4 of this Directive.
             Note 5:  There have been a small number of cases reported in which piccolo ducts were found to have been installed in the opposite wing, resulting in the incorrect orientation of the bleed holes.  During reinstallation of the piccolo ducts and leading edge assemblies after installation of the low-heat detection switches, particular attention should be paid to the correct alignment of the piccolo ducts (Refer Aircraft Maintenance Manual Task 30-11-41-820-801).
                5. Activate the outboard low-heat detection switches in accordance with the Accomplishment Instructions in Part F of Bombardier SB 601R-30-031, Revision A, dated 8 September 2009, or later revisions approved by the Chief, Continuing Airworthiness, Transport Canada.
             Note 6:  Accomplishment in accordance with Part B of the original issue of Bombardier SB 601R-30-031, dated 15 May 2009, also meets the intent of Requirement 5 of this Directive.
             Note 7:  Within the constraints of the compliance times specified below, each Requirement of this Directive may be accomplished separately from the other Requirements.
             Note 8:  Transport Canada AD CF-2009-0037 refers.
Compliance:  For Requirements 1 and 2 - Within 30 days after the effective date of this Directive.
             For Requirements 3 and 4 - Prior to accomplishment Requirement 5 of this Directive, but no later than 1 November 2010.
             For Requirement 5 - Following accomplishment of Requirements 3 and 4 of this Directive, but no later than 1 November 2010.
             This Airworthiness Directive becomes effective on 16 October 2009.
Background:  At present, the Wing Anti-Ice System (WAIS) sufficient heat switches/sensors on CL-600-2B19 aircraft are located at the inboard end of each wing and require a simultaneous low-pressure signal to generate a L or R WING A/ICE amber caution.  However, there have recently been several in-service occurrences that have highlighted the inability of the existing system to detect a low-heat condition in the wing leading edge at all times, with the potential consequence of unannunciated asymmetric ice build-up on the wing.  These have included partial failure of several piccolo ducts [AD/CL-600/83 (Transport Canada AD CF-2008-30) refers] and partial (not fully closed or open) failure of a modulating and shut-off valve, the latter resulting in unannunciated asymmetric ice build-up on the wing leading edge.  Such a condition, in combination with manoeuvres close to stick shaker activation, could possibly result in reduced controllability of the aircraft.
             This Directive mandates:

                a) Revision of the AFM to notify the flight crew that, following installation and activation of the low-heat detection switches, certain WAIS mode selection changes may result in a two-minute inhibition of the wing anti-ice message, if posted;

                b) Revision of the approved maintenance schedule to include one revised and three new functional checks that are