1+1 Transport 

Canada 

Transports 

Canada 

EMERGENCY 

No. 

CF-2014-21 

Issue Date 

10 July 2014 

AIRWORTHINESS DIRECTIVE 

TP 7245E 

1 112 

The following airworthiness directive (AD) may be applicable to an aircraft which our records indicate is registered in your name. ADs are issued pursuant to Canadian Aviation Regulation (CAR) 521 Division X. Pursuant to CAR 605.84 and the further details of CAR Standard 625, Appendix H, the continuing airworthiness of a Canadian r~gistered aircraft is contingent up'?n compliance wi t~ all applicable ADs. Failure to comply with the requirements of an AD may invalidate the flight authorization of the atrcraft. Alternattve means of compliance shall be applied for 1n accordance with CAR 605.84 and the above*referenced Standard. 

This AD has been issued by the Continuing Airworthiness Division (AARDG), National Aircraft Certification Branch, Transport Canada, Ottawa, telephone 613 952-4357. 

Number: 

ATA: 

Subject: 

CF-2014-21 

28 Type Certificate: A-131 

Fuel - Fuel Leak From the Auxiliary Power Unit Fuel Boost Pump Electrical Conduit 

in the Right Landing Light Compartment 

Effective Date: 10 July 2014 

Applicability: Bombardier Inc. model CL-600-2B16 aeroplanes, serial numbers 5906, 5910, 5912, 

5917, 5919 to 5932, 5934, 5935, 5939, 5940, 5942 and 5948. 

Compliance: As indicated below, unless already accomplished. 

Background: Bombardier Inc. has discovered fuel leakage in the auxiliary power unit (APU) fuel Boost 

Pump (BP) canister connector cavity. On some of those aeroplanes, leakage was also 

noticed at the APU fuel BP electrical conduit connection in tre right hand landing light 

compartment. The root cause of the subject fuel leak is indentified to be the improper 

length of the female connector keyway located in the fuel BP canister, causing a shift of 

the electrical harness and its seals. 

Available data indicates that on a hot day, due to the heat generated by the taxi light 

and/or landing lights on the ground, temperature in the landing light compartment can 

reach the fuel auto ignition temperature. Therefore, presence of any fuel in the right hand 

landing light compartment is considered to be a safety hazard that warrants mitigating 

action. 

In order to help mitigate the potential safety hazard precipitated by any fuel leakage in the 

right hand landing light compartment, Bombardier Inc., has revised the Aircraft Flight 

Manual (AFM) through Temporary Revisions (TRs) 604/38 and 605/20 dated 16 June 

2014 to restrict the operation of Taxi and Landing lights on the ground. Transport Canada 

issued Emergency AD CF-2014-17 to mandate incorporation of the above AFM TRs. 

To address the root cause of the subject fuel leakage from the APU fuel boost pump 

canister wiring conduit, Bombardier Inc. issued Alert Service Bulletin (ASB) A605-28-008 

that requires periodic inspection for fuel leaks and eventual the replacement of the 

discrepant fuel BP canister connectors on affected aeroplanes. The ASB has been revised 

to include an additional inspection of the new connector wiring for damage and this AD is 

issued to mandate the compliance with ASB A605-28-008 Revision 2 requirements. 

Pursuant to CAR 202.51 the registered owner of a Canadian aircraft shall , within seven days, notify the Minister 

in writing of any change of his or her name or address. 

~~ ~ra~ue"~~ av~~~~B'it~~a~~~~~ii~o~tf~t J~ ~~i\~~~-t~~~S8~~unications Centre (AARC) Canada or www.tc.gc.ca/civilaviation/communications/centre/ address.asp 

24-0022 (01-2005) 
Corrective 

Actions: 

~~ CF-2014-21 2/2 

Part I -Fuel Leak Check 

Within 25 hours air time from the effective date of this AD and at intervals not exceeding 8 

hours air time thereafter, inspect the right hand landing lights compartment for any fuel 

leaks from the APU fuel BP conduit outlet in accordance with Part A requirements of 

Bombardier ASB A605-28-008, Revision 2, dated 9 July 2014, or later revisions approved 

by the Chief, Continuing Airworthiness, Transport Canada., 

Part II - APU Fuel Boost Pump Canister Connector Replacement 

Within 6 months or 150 hours air time, whichever occurs first, from the effective date of 

this AD, inspect and replace the connector on the APU fuel BP canister in accordance with 

Part B instructions of Bombardier ASB A605-28-008, Revision 2, dated 9 July 2014, or 

later revisions approved by the Chief, Continuing Airworthiness, Transport Canada. 

For aeroplanes that have new connectors installed in accordance with Part B instructions 

of Bombardier ASB A605-28-008, Basic Issue, dated 21 April 2014, inspect the connector 

wiring for the serviceability, as per the part B requirement of ASB 605-28-008 Revision 2, 

dated 9 July 2014. 

Compliance with Part II of this AD constitutes the terminating action for inspection 

requirements per Part I of this AD. 

Compliance with ASB A605-28-008 Revision 1, meets the requirement of Part II of 

this AD. 

Authorization: For the Minister of Transport, 

Contact: 

ORIGINAL SIGNED BY 

Derek Ferguson 

Chief, Continuing Airworthiness 

A.K. Durrani, Continuing Airworthiness, Ottawa, telephone 613-952-4357, facsimile 

613-996-9178 or e-mail AD-CN@tc.gc.ca or any Transport Canada Centre.