EASA AD No : 2009-0146 

EASA Form 110 Page 1/3 

EASA AIRWORTHINESS DIRECTIVE 

AD No.: 2009-0146 

Date: 03 July 2009 

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 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 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 

[EC 2042/2003 Annex I, Part M.A.303] or agreed with the Authority of the State of Registry [EC 216/2008, Article 14(4) exemption]. 

Type Approval Holder’s Name : 

EADS-CASA 

Type/Model designation(s) : 

CN-235 series and C-295 aeroplanes 

TCDS Number : EASA.A.186 

Foreign AD : Not applicable 

Supersedure : This AD supersedes EASA AD 2007-0007 dated 07 January 2007. 

ATA 28 Fuel – Fuel Tank Safety ALS Part 5 – Fuel Airworthiness 

Limitations (FAL) – Implementation 

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

Applicability: CN-235, CN-235-100, CN-235-200, CN-235-300 and C-295 aeroplanes, all 

serial numbers. 

Reason: Prompted by the accident of a Boeing 747-131 (flight TWA800), the FAA 

published SFAR 88 (Special Federal Aviation Regulation 88). Subsequently, 

the Joint Aviation Authorities (JAA) recommended the application of a similar 

regulation to the National Aviation Authorities (NAA) of its member countries. 

Under this regulation, all holders of type certificates for passenger transport 

aeroplanes with either a passenger capacity of 30 or more, or a payload 

capacity of 3 402 kg (7 500 lbs) or more, which have received their certification 

since 01 January 1958, are required to conduct a design review against 

explosion risks. 

In August 2005, EASA published a policy statement on the process for 

developing instructions for maintenance and inspection of Fuel Tank System 

ignition source prevention (EASA D 2005/CPRO), that also included the EASA 

expectations with regard to compliance times of the corrective actions on the 

unsafe and the not unsafe part of the harmonised design review results. 

Fuel Airworthiness Limitations arising from the required systems safety analysis 

are items that have been shown to have failure mode(s) associated with an 

‘unsafe condition’ as defined in the FAA memo 2003-112-15 ‘SFAR 88 – 

Mandatory Action Decision Criteria’. These are identified in Failure Conditions 

for which an unacceptable probability of ignition risk could exist if specific tasks 

and/or practices are not performed in accordance with the corrective action(s) 
EASA AD No : 2009-0146 

EASA Form 110 Page 2/3 

developed by the TC holder. 

To address these potential unsafe conditions, EASA issued AD 2007-0007, 

mandating the Fuel System Airworthiness Limitations, comprising 

maintenance and inspection tasks and Critical Design Configuration Control 

Limitations (CDCCL) that were, at that moment, defined in issue C of EADSCASA document DT-0-C00-05001. That document has now been revised and 

updated to issue D. 

For the reasons described above, this EASA AD retains the requirements of 

AD 2007-0007, which is superseded, and requires the implementation of the 

revised Fuel Airworthiness Limitations contained in issue D of EADS-CASA 

document DT-0-C00-05001 and accomplishment of related modifications. 

Effective Date: 17 July 2009 

Required Action(s) 

and Compliance 

Time(s): 

Required as indicated, unless previously accomplished: 

(1) Within the next 3 months after 23 January 2007 [the effective date of 

EASA AD 2007-0007], amend the approved aircraft maintenance 

programme to incorporate the Fuel Airworthiness Limitation 

maintenance & inspection tasks as defined in EADS-CASA document 

DT-0-C00-05001 at Issue C. 

(2) Prior to 01 July 2007, amend the approved aircraft maintenance 

programme to incorporate the data contained in EADS-CASA Fuel 

Airworthiness Limitations document DT-0-C00-05001 issue C and 

amend internal procedures and documentation to ensure management 

of control of CDCCL and revisions thereof. 

(3) Within the next 3 months after the effective date of this AD, accomplish 

the following: 

(3.1) Amend the approved aircraft maintenance programme to incorporate the 

Fuel Airworthiness Limitation maintenance & inspection tasks and 

CDCCL’s as defined in EADS-CASA document DT-0-C00-05001 at 

issue D, as applicable to the aeroplane configuration. 

(3.2) Amend the operator’s internal documentation to reflect the data 

contained in EADS-CASA Fuel Airworthiness Limitations document 

DT-0-C00-05001 at issue D. 

(4) Thereafter, within the thresholds and intervals defined in that document, 

accomplish the tasks described in EADS-CASA document 

DT-0-C00-05001 at issue D. 

(5) Within the next 6 months after the effective date of this AD, accomplish 

the following modifications on CN-235, CN-235-200 and CN-235-300 

aeroplanes, serial numbers as indicated in each referenced EADSCASA Service Bulletin (SB): 

(5.1) Add thermal insulation to the air condition compression system in 

accordance with the instructions of EADS-CASA SB-235-21-18. 

(5.2) Modify the separation between the centre wing electrical harnesses and 

fuel tubes in accordance with the instructions of EADS-CASA 

SB-235-28-18. 

(5.3) Apply double bonding connections on fuel tubes in accordance with the 

instructions of EADS-CASA SB-235-24-20. 

Ref. Publications: 

EADS-CASA Document DT-0-C00-05001, “CN-235 and C-295 Fuel 

Airworthiness Limitations”, issue D, dated October 2008. 

EADS-CASA Service Bulletin No. SB-235-21-18 dated 2 August 2007. 

EADS-CASA Service Bulletin No. SB-235-28-18 dated 2 August 2007. 

EADS-CASA Service Bulletin No. SB-235-24-20 dated 2 August 2007. 
EASA AD No : 2009-0146 

EASA Form 110 Page 3/3 

The use of later approved revisions of these documents is acceptable for 

compliance with the requirements of this AD. 

The EASA Policy statement EASA D 2005/CPRO on Fuel Tank System 

ignition source prevention can be found on the EASA website: 

www.easa.europa.eu (Search for CPRO). 

Remarks :

1. If requested and appropriately substantiated, EASA can approve 

Alternative Methods of Compliance for this AD. 

2. This AD was posted on 05 June 2009 as PAD 09-081 for consultation until 

26 June 2009. No comments were received during the consultation period. 

3. Enquiries regarding this AD should be referred to the Airworthiness 

Directives, Safety Management & Research 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, Military Transport Aircraft Division (MTAD), Integrated 

Customer Services (ICS), Technical Services, Avenida de Aragón 404, 

28022 Madrid, Spain; 

Telephone +34 91 585 55 84; Facsimile +34 91 585 55 05; 

E-mail: MTA.TechnicalService@casa.eads.net