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AD Number: CF-2014-41

Issue Date: 26 November 2014 

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.

Number: CF-2014-41 Effective Date: 9 December 2014 

ATA: 73 Type Certificate: E-19

Subject: Engine Fuel and Control - Fuel Spray Nozzle – Fuel Leaks Resulting In Engine Fire

Replacement: Supersedes AD CF-2013-29 issued 18 October 2013 and AD CF-2005-11R2 issued 

12 December 2013. 

Applicability: Pratt & Whitney Canada:

Model PW120, PW121 and PW121A engines with Post Service Bulletin (SB) 

21610 configuration,

Model PW124B, PW127, PW127E and PW127F engines with Post SB

21607 configuration,

Models PW127E / PW127F Engines with Serial No. PCE-EB0366 and earlier,

Model PW127G Engines with Serial No. PCE-AX0275 and earlier, 

Model PW127H Engines with Serial No. PCE-AY0019 and earlier,

Models PW127M / PW127N with Serial No. PCE-ED0810 and earlier.

Compliance: As indicated below, unless already accomplished.

Background: Fuel leaks at the fuel spray nozzle (FSN) manifold connection on certain PW 100 engine 

installations have occasionally resulted in engine fires. Most of these fuel leaks and 

resultant fires were reported on aeroplanes immediately following maintenance work. To 

improve the ability to detect post maintenance fuel leaks on the ground, P&WC issued 

SB 21803 that was mandated per AD CF-2013-29 to remove the secondary O-ring seal 

from the FSN manifold connections, the presence of which could induce false positive 

results for the post maintenance fuel leak checks. 

However, on post AD CF-2013-29 configured engines with the O-ring seal removed; there 

were reported incidences of fuel seepage past the metal to metal sealing surfaces of FSN 

and adapter manifold. To address the subject fuel seepage problem, P&WC issued 

SB 21841 to modify the FSN adapter and SB 21848 to install a metallic conical seal at the 

FSN manifold connection, which was later superseded by SB 21860 that introduced a 

new/improved conical seal. 

In order to effectively address the FSN manifold fuel leaks and the potential hazard of inflight engine fires, P&WC has defined the final configuration of the fuel manifold 

installation that constitutes the terminating action. P&WC SB 21861 consolidates all the 

required corrective actions, including the AD CF-2013-29 and AD CF-2005-11R2

requirements into one document. This AD is issued to mandate compliance with 

requirements of SB 21861. 

Corrective Actions:

Within 1500 hours air time or during the next fuel spray nozzle replacement on the

affected engines, whichever occurs first from the effective date of this AD, modify the fuel 

spray nozzle manifold installation in accordance with SB 21861 dated 21 November 

2014, or later revisions approved by the Chief, Continuing Airworthiness, Transport 

Canada.

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. 

For all changes to your mailing address, contact your TC Regional Aircraft Registration Office at 1-800-305-2059,

option 1 for English, 2 for Aircraft Registration and then select the appropriate region.

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Engines with previous incorporation of P&WC SBs 21803R5, SB 21860R2 or their earlier 

versions and SB 21841R2 satisfy the mandated requirements of this AD. 

Authorization: For the Minister of Transport, 

ORIGINAL SIGNED BY 

Derek Ferguson

Chief, Continuing Airworthiness

Contact: 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.