EASA AD No.: 2012-0045

EASA Form 110 Page 1/2 

## EASA AIRWORTHINESS DIRECTIVE

AD No.: 2012-0045

Date: 21 March 2012

Note: This Airworthiness Directive (AD) is issued b y EASA, acting in accordance with Regulation (EC) No 216/2008 on behalf of the European Communit y, its Member States and of the European third countries that participate in the ac tivities of EASA under Article 66 of that Regulation.
This AD is issued in accordance with EC 1702/2003, Part 21A.3B. In accordance with EC 2042/2003 Annex I, Part M.A.301, the continuing airworthiness of an aircraft shall be en sured by accomplishing any applicable ADs. Conseque ntly, no person may operate an aircraft to which an AD applies, except in accordan ce with the requirements of that AD, unless otherwi se specified by the Agency [EC 2042/2003 Annex I, Part M.A.303] or agreed with the Authority of the State of Registry [EC 216/2008, A rticle 14(4) exemption].


### Type 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 Extinguisher Discharg e Cartridge Wiring – Inspection

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

Applicability: 

### CN-235, CN-235-100, CN-235-200, CN-235-300 aeroplan es all serial numbers.

Reason: Reports have been received of finding wrong electrical polarity connections of engine fire extinguishing discharge cartridges on C ASA CN-235 aeroplanes. The results of the subsequent investigation showed that the incorrect discharge cartridge assembly was caused by production line er rors. This condition, if not detected and corrected, coul d prevent the actuation of the discharge cartridge in case of automatic fire detec tion or manual initiation in case of engine fire, possibly resulting in damage t o the aeroplane and injury to occupants. To address this potential unsafe condition, EADS CA SA (Airbus Military) developed instructions to identify erroneous wiring polarity installation. For the reasons described above this AD requires a one-time inspection to verify proper electrical polarity of wiring of each engine fire extinguisher discharge cartridge and, depending on findings, cor rective action.

Effective Date: 04 April 2012EASA AD No.: 2012-0045

EASA Form 110 Page 2/2 Required Action(s) and Compliance Time(s): Required as indicated, unless accomplished previous ly: (1) Within 30 days after the effective date of this AD, accomplish a one-time inspection to identify correct polarity of each pai r of electrical connectors of each engine fire extinguisher cartridge, in accorda nce with the instructions of Airbus Military All Operator Letter (AOL) 235-02 0. (2) If, during the inspection as required by paragr aph (1) of this AD, erroneous wiring polarity installation is detected, before ne xt flight, report to Airbus Military for approved instructions and accomplish t hose instructions accordingly.
Ref. Publications: Airbus Military AOL 235-020 date d 9 March 2012. The use of later approved revisions of this documen t is acceptable for compliance with the requirements of this AD.

Remarks : 1. If requested and appropriately substantiated, EA SA can approve Alternative Methods of Compliance for this AD. 2. The safety assessment has requested not to imple ment the full consultation process and an immediate publication and notificati on. 3. Enquiries regarding this AD should be referred t o the Safety Information Section, Executive Directorate, EASA. E-mail: ADs@easa.europa.eu

. 4. For any question concerning the technical conten t 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