EASA AD No.: 2013

- 0293 R1

TE. CAP.00110

- 00 3 © European Aviation Safety Agency. All rights reserved. 1 / 2 Proprietary document. Copies are not controlled. Confirm revision status through the EASA

- Internet/Intranet. 

## EASA AIRWORTHINESS DIRECTIVE

AD No

. : 2013

- 0293 R1

Date: 17 December 2013

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 E U 748/2012 , Part 21

. A.3B. In accordan ce 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 ope rate 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].


### Design Approval Holder’s Name : BALLONBAU WÖRNER GmbH Type/Model designation :
NL

- STU gas balloons

TCDS Number: EASA.BA.009

F oreign AD: Not applicable

Revision : This AD revises EASA AD 2013

- 0293 dated 09 D ecember 2013.



### ATA 05 Time Limits and Maintenance Checks

– Amendment

Manufacturer(s): Ballonbau Wörner GmbH

Applicability: NL

- STU/280, NL

- STU/380, NL

- STU/510, NL

- STU/640

, NL

- STU/840 and NL

- STU/1000 gas balloons

, all serial number s (s/n)

. Note: NL

- STU gas balloons with s/n 1101 or higher will be delivered with the new Instructions for Continued Airworthiness dated November 2013.

Reason: The results of an a nalysis of NL

- STU maintenance data revealed that the current inspection intervals are no longer adequate to ensure timely detection of deterioration or damage , which could affected the structural integrity of the balloon

. This condition , if not detected and corrected, could lead to failure of balloon compon ents or envelope

, possibly resulting in loss of the balloon. To address this potential unsafe condition, B allonbau Wörner developed new , more detailed and d escriptive Instructions for Continued Airworthiness ( at the same time separated from the Flight Manual ) and issued Technische Mitteilung /Technical Note EASA.BA.009

- 6 to inform all operators

. For the reasons described above, EASA issued AD 2013

- 0293 to require compliance with the updated Instructions for Continued Airworthiness

. This AD is revised to extend the compliance time for the initial porosity test

, for balloons which have already exceeded the relevant threshold

.

Effective Date: Revision 01 (same as original issue): 23 December 2013EASA AD No.: 2013

- 0293 R1

TE. CAP.00110

- 00 3 © European Aviation Safety Agency. All rights reserved. 2 / 2 Proprietary document. Copies are not controlled. Confirm revision status through the EASA

- Internet/Intranet. Required A ction(s) and Compliance Time : Required as indicated , unless accomplished previously: (1) From the effective date of this AD, except as specified in paragraph (3) of this AD, accomplish all maintenance tasks within the compliance times as specified in Ballonbau Wörner Anweisungen zur Aufrechterhaltung der Lufttüchtigkeit, Gasballon Baumuster NL

- STU / Instructions for Continued Airworthiness, Gas Balloon Model NL STU, original issue

, dated November 2013.
Note: Bal lonbau Wörner T echnische M itteilung /T echnical N ote EASA.BA.009

- 6 (bilingual German

- English document ) provides further detailed information

. ( 2 ) Compliance with the requirements of paragraph (1) of this AD can be demonstrated by: ( 2 .1) Revising as follows the approved Aircraft Maintenance Programme (AMP) on the basis of which the op erator or the owner ensures the continuing airworthiness of each operated balloon : Incorporate all maintenance requirements and associated airworthiness limitations as specified in Ballonbau Wörner Anweisungen zur Aufrechterhaltung der Luft tüchtigkeit, Gasballon Baumuster NL

- STU / Instructions for Continued Airworthiness, Gas Balloon Model NL STU original issue

, dated November 2013

, and ( 2 .2) Complying with the approved AMP described in paragraph ( 2 .1) of this AD. ( 3 ) For balloons which, on the effective date of this AD, have exceeded the threshold compliance time for the porosity test, as defined in Chapter s 5.1.1.4, 5.1. 2 .4 and 5.1.3.4 of Ballonbau Wörner Anweisungen zur Aufrechterhaltung der Lufttüchtigkeit, Gasballon Baumuster NL

- STU / I nstructions for Continued Airworthiness, Gas Balloon Model NL STU, original issue, dated November 2013, within 3 months after the effective date of this AD , accomplish the initial porosity test

.

Ref. Public ations: Ballonbau Wörner Anweisungen zur Auf rechterhaltung der Lufttüchtigkeit, Gasballon Baumuster NL

- STU / Instructions for Continued Air worthiness, Gas Balloon Model NL STU , original issue

, dated November 2013.
Ballonbau Wörner T echnische Mitteilung / Technical Note EASA.BA.009

- 6
, dated 7 November 2013

. The u se of later approved revisions of t hese document s 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. Based on t he required actions and the compliance time, EASA ha s decided to issue a Final AD with Request for Comments

, postponing the public consultation process until after publication

. 3. Enquiries regarding this A D 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: Ballonbau Wörner Gm b H

, Zirbelstraße 57c

, 86154 Augsburg

, Germany Telephone: +49

- (0)821

- 4504060
, Facsimile: +49

- (0)821

- 419641 E

- mail: info@ballonbau.de ; Internet: www.ballonbau.de

.