Transport Transports 

Canada Canada

 TP 7245E

 

AIRWORTHINESS DIRECTIVE

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 registered aircraft is contingent upon compliance with all applicable ADs. Failure to comply with the requirements of an AD may invalidate the flight authorization of the aircraft. 

Alternative means of compliance shall be applied for in 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.

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. 

To request a change of address, contact the Civil Aviation Communications Centre (AARC) at Place de Ville, Ottawa, Ontario K1A 0N8, or 1-800-305-2059, or www.tc.gc.ca/civilaviation/communications/centre/ address.asp 

24-0022 (01-2005)

1/3 No.

CF-2010-06R1

Issue Date 

 8 August 2013 

Number: CF-2010-06R1 

Subject: In-Flight Loss of Cabin Pressurization: Blockage of the Safety Valve Cabin 

Pressure-Sensing Port

Effective: 22 August 2013 

Revision: Supersedes Airworthiness Directive CF-2010-06, issued 24 February 2010. 

Applicability: Bombardier Inc. model BD-100-1A10 aeroplanes, serial numbers (S/Ns) 20001 

through 20274. 

Compliance: As indicated below. 

Background: Investigation of a high altitude loss of cabin pressurization on a BD-100-1A10 aeroplane

determined that it was caused by a partial blockage of a safety valve cabin pressuresensing port, in conjunction with a dormant failure/leakage of the safety valve 

manometric capsule. The blockage, caused by accumulation of lint/dust on the grid of 

the port plug, did not allow sufficient airflow through the cabin pressure-sensing port to 

compensate for the rate of leakage from the manometric capsule, resulting in the 

opening of the safety valve. It was also determined that failure of the manometric 

capsule alone would not result in the opening of the safety valve. 

The original issue of this AD mandated a revision of the maintenance schedule, the 

cleaning of the safety valves, the removal of material from the area surrounding the 

safety valves and the modification of the safety valves with a gridless cabin 

pressure-sensing port plug. 

Since the original issue of this AD, there have been two additional reported events of

in-flight loss of cabin pressurization that were attributed to partial blockage of a safety 

valve cabin pressure-sensing port in conjunction with a failed safety valve 

manometric capsule. 

Bombardier Aerospace has determined that aeroplanes with a particular interior 

installation require improved instructions to clean the safety valves and their surrounding 

area. In addition, Aircraft Maintenance Manual tasks have been updated to ensure that 

inspection of the safety valves and their surrounding is carried out after any

maintenance action. 

Revision 1 of this AD is issued to mandate inspection and cleaning of the safety valves 

and their surrounding area on the affected aeroplanes. 

Corrective 

Actions: 

Part I – Revision of the Maintenance Schedule 

Applicable to BD-100-1A10 aeroplanes, S/Ns 20001 through 20274. 

Within 30 days from the effective date of the original issue of this AD (19 March 2010), 

unless already accomplished: 
No.

N° CF-2010-06R1 2/3 

Revise the Transport Canada approved maintenance schedule by incorporating the 

repetitive functional test of the safety valves (Task Number 21-31-09-101) and repetitive 

discard of the safety valve filters (Task number 21-31-09-102) contained in BD-100 

Time Limits/Maintenance Checks (TLMC), Temporary Revision (TR) 5-2-53, dated 

1 October 2009, 

Notes: 1. BD-100 TLMC TR 5-2-53 contains phase-in schedules, as necessary, for the 

initial functional test of the safety valves and the initial discard of the safety 

valve filters on aeroplanes that have exceeded the initial task intervals. 

 2. Compliance with superseding TRs or later revisions of the BD-100 TLMC, 

approved by Transport Canada, also satisfies the requirements of Part I of 

this directive. 

Part II – Initial Cleaning of the Safety Valves, including the Cabin PressureSensing Port Plugs, and Removal of Surrounding Material 

Applicable to BD-100-1A10 aeroplanes, S/Ns 20003 through 20173, 20176 and 20177. 

Within 50 hours air time from the effective date of the original issue of this AD (19 March

2010), unless already accomplished: 

Inspect both safety valves and the surrounding areas, clean the safety valves 

(including the cabin pressure-sensing port plugs) and remove surrounding material, as 

necessary, in accordance with the Accomplishment Instructions in Bombardier Service 

Bulletin (SB) 100-25-14, dated 30 June 2008, or SB 100-25-21, dated 30 June 2008, 

whichever is applicable, or later revisions approved by the Chief, Continuing 

Airworthiness, Transport Canada. 

Part III - Initial Cleaning of the Safety Valve Cabin Pressure-Sensing Port Plugs 

Applicable to BD-100-1A10 aeroplanes, S/Ns 20174, 20175, 20178 through 20189, 

20191 through 20228, 20230 through 20232, 20235, 20237, 20238, 20241, 20244, 

20247, 20249 through 20251, 20254, 20256 and 20259.

Within 50 hours air time from the effective date of the original issue of this AD (19 March

2010), unless already accomplished: 

Clean the cabin pressure-sensing port plug in both safety valves, in accordance with the 

Accomplishment Instructions in Paragraph 2.B., Part A, of Bombardier Alert Service 

Bulletin (ASB) A100-21-08, dated 18 June 2009, or later revisions approved by the 

Chief, Continuing Airworthiness, Transport Canada.

Part IV - Repetitive Cleaning of the Safety Valve Cabin Pressure-Sensing Port 

Plugs 

Applicable to BD-100-1A10 aeroplanes, S/Ns 20003 through 20189, 20191 through 

20228, 20230 through 20232, 20235, 20237, 20238, 20241, 20244, 20247, 20249 

through 20251, 20254, 20256 and 20259. 

Within 50 hours air time from the effective date of the original issue of this AD 

(19 March 2010), and subsequently no later than every 50 hours air time until Part V of 

this directive is accomplished: 

Clean the cabin pressure-sensing port plug in both safety valves, in accordance with the 

Accomplishment Instructions in Paragraph 2.B., Part A, of Bombardier ASB A100-21-08, 

dated 18 June 2009, or later revisions approved by the Chief, Continuing Airworthiness, 

Transport Canada. 

Part V – Modification: Replacement of the Safety Valve Cabin Pressure-Sensing 

Port Plugs and Reidentification of the Safety Valves 

Applicable to BD-100-1A10 aeroplanes, S/Ns 20003 through 20189, 20191 through 

20228, 20230 through 20232, 20235, 20237, 20238, 20241, 20244, 20247, 20249 

through 20251, 20254, 20256 and 20259. 
No.

N° CF-2010-06R1 3/3 

Within 12 months from the effective date of the original issue of this AD 

(19 March 2010), unless already accomplished: 

Replace the cabin pressure-sensing port plug Part Number (P/N) 2844-060 in both 

safety valves with a new gridless plug P/N 2844-19 and reidentify the safety valves, in 

accordance with the Accomplishment Instructions in Paragraph 2.C., Part B, of 

Bombardier ASB A100-21-08, dated 18 June 2009, or later revisions approved by the 

Chief, Continuing Airworthiness, Transport Canada. 

Part VI – Inspection and Cleaning of the Safety Valves and Surrounding Area 

Applicable to BD-100-1A10 aeroplanes, S/Ns 20003 through 20123, 20126, 20127, 

20129 through 20133, 20135 through 20138, 20140 through 20142, 20144, 20145 and 

20147: 

Within 500 hours air time or 15 months, whichever occurs first, from the effective date of 

this AD, unless already accomplished, inspect both safety valves and the surrounding 

area, clean the safety valves and remove surrounding material, as required, in 

accordance with the Accomplishment Instructions in Bombardier SB 100-25-21, 

Revision 2, dated 25 July 2013, or later revisions approved by the Chief, Continuing 

Airworthiness, Transport Canada. 

Compliance in accordance with Revision 1 of SB 100-25-21, dated 2 May 2013, prior to 

the effective date of this AD, also meets the requirements of Part VI of this AD. 

Authorization: For the Minister of Transport, 

ORIGINAL SIGNED BY 

Philip Tang 

Acting Chief, Continuing Airworthiness 

Contact: Robert Farinas, Continuing Airworthiness, Ottawa, telephone 613-952-4357, facsimile 

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