EASA AD No : 2011-0172 

EASA Form 110 Page 1/2 

EASA AIRWORTHINESS DIRECTIVE 

AD No.: 2011-0172 

Date: 07 September 2011 

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 : 

Eurocopter Deutschland GmbH 

Type/Model designation(s) : 

EC 135 and EC 635 helicopters 

TCDS Number: EASA.R.009 

Foreign AD: Not applicable 

Supersedure: None 

ATA 26 Fire Protection – Fire Extinguishing System Injection Tubes – 

Replacement 

Manufacturer(s): Eurocopter Deutschland GmbH (ECD), Eurocopter España S.A., 

Eurocopter S.A. 

Applicability: EC 135 P1(CDS), EC 135 P1(CPDS), EC 135 P2(CPDS), EC 135 P2+, 

EC 135 T1(CDS), EC 135 T1(CPDS), EC 135 T2(CPDS), EC 135 T2+, 

EC 635 T1(CPDS), EC 635 P2+ and EC 635 T2+ helicopters, all serial 

numbers, equipped with Single engine fire extinguishing system Part Number 

(P/N) L262M1808101, P/N L262M1812101 or P/N L262M1812102, or equipped 

with Dual engine fire extinguishing system P/N L262M1813102. 

Reason: A recent inspection has shown that the injection tubes of the fire extinguishing 

system on EC 135 and EC 635 helicopters are not compliant with the relevant 

airworthiness requirements, because they are also forming part of the firewall. 

This condition, if not corrected, may, in case of an engine fire, affect the 

function of the fire extinguishing system and degrade the fire containment 

capability of the system to such an extent that it could result in the inability to 

extinguish the engine fire. 

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

injections tubes, or replacement of the tubes with modified, heat-resistant 

injection tubes. 

Effective Date: 21 September 2011 
EASA AD No : 2011-0172 

EASA Form 110 Page 2/2 

Required Action(s) 

and Compliance 

Time(s): 

Required as indicated, unless accomplished previously: 

(1) Within the compliance time as specified in Table 1 of this AD, as applicable 

to the system installed on the helicopter, modify or replace the right-hand 

(RH) and left-hand (LH) injection tubes and elbow (if installed), as identified 

by P/N in Table 2 of this AD, in accordance with the instructions of 

Eurocopter Deutschland GmbH (ECD) Alert Service Bulletin (ASB) EC135-

26A-003. 

Table 1 - System installed on the helicopter 

Affected System: Compliance time, after the 

effective date of this AD: 

P/N L262M1808101, 

P/N L262M1812101, or 

P/N L262M1812102 Single engine 

fire extinguishing system 

Within 9 months 

P/N L262M1813102 Dual engine 

fire extinguishing system 

Within 6 months 

Table 2 – Parts to be modified/replaced 

For single engine 

fire extinguishing 

system: 

RH tube P/N L262M1810101 

LH tube P/N L262M1811801 and/or 

P/N L262M1809101

For dual engine 

fire extinguishing 

system: 

RH tube P/N L262M1814101 

RH tube P/N L262M1808212 

LH tube elbow P/N L262M1815101 

LH tube P/N L262M1808211 

(2) From the effective date of this AD, do not install any injection tube or 

elbow, as identified by P/N in Table 2 of this AD, on any helicopter, unless 

the part has been modified in accordance with the instructions of ECD ASB 

EC135-26A-003. 

Ref. Publications: Eurocopter Deutschland GmbH ASB EC135-26A-003 Revision 01 dated 

16 May 2011. 

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 14 July 2011 as PAD 11-068 for consultation until 

11 August 2011. No comments were received during the consultation 

period. 

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

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

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

this AD, please contact: 

Eurocopter Deutschland GmbH, Industriestrasse 4, 

86607 Donauwörth, Federal Republic of Germany 

Telephone: + 49 (0)151-1422 8976; Facsimile: + 49 (0)906-71 4111.