EASA AD No.: 2015-0011

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EASA AIRWORTHINESS DIRECTIVE 

AD No.: 2015-0011 

Date: 20 January 2015 

Note: This Airworthiness Directive (AD) is issued by EASA, acting in accordance with Regulation 

(EC) No 216/2008 on behalf of the European Community, its Member States and of the 

European third countries that participate in the activities of EASA under Article 66 of that 

Regulation.

This AD is issued in accordance with EU 748/2012, Part 21.A.3B. In accordance with EU 1321/2014 Annex I, Part M.A.301, the 

continuing airworthiness of an aircraft shall be ensured by accomplishing any applicable ADs. Consequently, no person may operate an 

aircraft to which an AD applies, except in accordance with the requirements of that AD, unless otherwise specified by the Agency [EU 

1321/2014 Annex I, Part M.A.303] or agreed with the Authority of the State of Registry [EC 216/2008, Article 14(4) exemption]. 

Design Approval Holder’s Name: 

EADS-CASA 

Type/Model designation(s): 

CN-235 aeroplanes

TCDS Number: EASA.A.186 

Foreign AD: Not applicable 

Supersedure: None 

ATA 26 Fire Protection – Engine Fire Extinguishing / Detection System – 

Modification 

Manufacturer(s): EADS-CASA, formerly Construcciones Aeronáuticas S.A. (CASA) 

Applicability: CN-235-200 and CN-235-300 aeroplanes, manufacturer serial numbers from 

C-018 to C-211, inclusive. 

Reason: Several cases of false engine fire warning events were reported, which 

consequently led to engine in-flight shut down (IFSD) executed by the flight 

crew using the appropriate emergency procedures. Subsequent investigation 

determined that these false engine fire warnings were the result of insufficient 

insulation capability of the engine fire detection system. This allowed 

penetration of moisture into the fire detector connectors, reducing the insulation 

resistance between the inner electrode and connector housing below the 

required values. 

This condition, if not corrected, could lead to further cases of unnecessary 

engine IFSD, possibly resulting in reduced control of the aeroplane. 

To address this potential unsafe condition, EADS-CASA issued Service Bulletin 

(SB) SB235-26-0006 providing modification instructions. 

For the reasons described above, this AD requires modification of the location 

and routing of the engine fire detection system. 

Effective Date: 03 February 2015 
EASA AD No.: 2015-0011

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Required Action(s) 

and Compliance 

Time(s): 

Required as indicated, unless accomplished previously: 

Within 18 months after the effective date of this AD, modify the location and 

routing of the engine fire detection system in accordance with EADS-CASA SB 

SB235–26–0006. 

Ref. Publications: EADS-CASA SB235-26-0006 original issue, dated 08 July 2014. 

The use of later approved revisions of this document is acceptable for 

compliance with the requirements of this AD. 

Remarks: 1. If requested and appropriately substantiated, EASA can approve 

Alternative Methods of Compliance for this AD. 

2. This AD was posted on 19 December 2014 as PAD 14-178 for consultation 

until 16 January 2015. No comments were received during the consultation 

period. 

3. Enquiries regarding this AD should be referred to the Safety Information 

Section, Certification Directorate, EASA. E-mail: ADs@easa.europa.eu. 

4. For any question concerning the technical content of the requirements in 

this AD, please contact: 

EADS CASA (Airbus Military) 

Services / Engineering Support 

e-mail: MTA.TechnicalService@military.airbus.com. 

Fax: +34 91 585 3127 

For US operators, contact alternatively: 

e-mail: TechnicalSupport@airbusmilitaryna.com.