1+1 Transport

Canada

Transports

Canada

CF-2010-12

Issue Date

6 May 2010

TP 7245E

1/2

AIRWORTHINESS DIRECTIVE

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Number:

Subject:

Effective:

Applicability

Compliance:

Background:

Corrective

Actions:

CF-2010-12

Wing Leading Edge Thermal Switches and Wing Anti·lce Duct Piccolo Tubes -

Airworthiness Limitation Tasks

26 May 2010

Bombardier Inc. Model: CL-600-2B19, Serial Numbers 7003 and subsequent

As indicated below, unless already accomplished.

During flighHesting of a wing anti-ice piccolo lube containing a deliberate small breach, it

was determined that the wing leading edge thermal switches Part Number (PIN)

601 R59320-1 were not detecting the consequent bleed leak at the design threshold, As

a result, Airworthiness Liinitation (AWL) tasks, consisting of a functional check of the

wing leading edge thermal switches (PIN 601R59320-1) and an inspection of the wing

anti-ice duct piccolo tubes on aeroplanes with these switches installed, have been

introduced. These tasks will limit exposure to dormant failure of the wing leading edge

thermal switches in the event of piccolo tube failure, which eouid potentially compromise

the structural integrity of the wing leading edge and the effectiveness of the wing anti-ice

system.

This directive mandales revision of the approved maintenance schedule to include the

above referenced tasks, including phase-in schedules that supersede the phase-in

schedules specified in the AWL tasks,

Note: Thermal switches, PIN 601R59320-1, were installed in production on aircrafi

Serial Numbers (SIN) 7213 and subsequent. Service Bulletin 601R-30-()22

covered in-service installation of these switches on aircraft SINs 7003 through

7212.

A. Revision of Maintenance Schedule

Within 30 days after the effective date of this directive:

Revise the Transport Canada approved maintenance schedule by incorporating the

thermal switch functional check and piccolo tube inspection requirements (task

number:; identified below) contained in the applicable Temporary Revision (TR) to

the Maintenance Requirements Manuai (MRM), CSP A-053, Part 2, Appendix A,

Certification Maintenance Requirements, as follows:

• MRM TR 2A-SO,dated 17 November 2009: Task Number C36-20-133-03

• MRM TR 2A-49, dated 17 November 2009: Task Number C30-1 0-133-01

B. Phase-In Schedule

The phase-in schedules for the initial functional check of the thermal switches <lnd

the initial inspection of the piccolo tubes, as detailed below, supersede those

specified in Paragraphs 1 and 2 of MRM TRs 2A-50 and 2A-49:

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1) Functional Check of the Thermal Switches (Task Number C36-20-133-03)

(a) For aeroplanes thai have 15 000 Flight Hours (FH) or less at the effective

dale of this directive, do the initial functional check of the lhermai switches by

15 000 FH or by 31 December 2010, whichever occurs last,

(b) For aeroplanes that have more than 15 000 FH at the effective date of this

directive. do the initial functional check of the thermal switches by

31 December 201 D.

2) Inspection of the Piccolo Tubes (Task Number C30-10-133-01)

(a) For piccolo tubes that have 15 000 FH or less at the effective dale of this

directive, do the initial inspection by 15 000 FH or by 31 December 2010,

whichever occurs last.

(b) For piccolo lubes that have more than 15 000 FH at the effective date of this

directive, do the initial inspection by 31 December 201 D.

Notes: Noles 1. and 2. in MRM TR 2A-49 remain applicable,

2. Compliance with superseding TRs or later revisions of the MRM,

approved by Transport Canada, also satisfies the requirements of

this directive.

Authorization: For Minister of Transport, Infrastructure and Communities

OR1G1N:\L SIGNED BY

Derek Ferguson

Chief, Continuing Airworthiness

Contact Mr. Richard Topham, Continuing Airworthiness, Ottawa, telephone 613-952-4357,

facsimile 613-996-9178 or e-mail CAVVWEBFeedback@lcgc.ca or any Transport

Canada Centre .