1/2 

EASA AIRWORTHINESS DIRECTIVE 

AD No : 2006 – 0127 

Date: 18 May 2006

No person may operate an aircraft to which an Airworthiness Directive applies, except in accordance with the 

requirements of that Airworthiness Directive unless otherwise agreed with the Authority of the State of Registry.

Type Approval Holder’s Name : 

BRP-Rotax GmbH & CoKG 

Type/Model designation(s) : 

Rotax 914 F Series 

TCDS Number : Austria TW10-ACG 

Foreign AD : not applicable 

Supersedure : EASA AD 2006-0121 

ATA 78 Exhaust - Inspection of the Exhaust Muffler Part No. 979402 and 

Part No. 979404 

 

Manufacturer(s): BRP-Rotax GmbH & CoKG, Austria 

Bombardier – Rotax GmbH, Austria 

Applicability: Rotax 914 F Series engines with S/N 4,420.372 up to 4,420.406 inclusive 

with exhaust muffler Part No. 979402 installed; 

Rotax 914 F Series engines from S/N 4,420.407 up to 4,420.436 inclusive 

with exhaust muffler Part No. 979402 respectively Part No. 979404 

installed; 

Exhaust Muffler Part No. 979402 with S/N 02.0001 up to S/N 02.0322 

inclusive and S/N 03.0001 up to 03.0108 inclusve; 

Exhaust Muffler Part No. 979404 with S/N 03.0200 up to S/N 04.0799 

inclusive. 

Reason: Occurrence of cracks in the exhaust muffler in the area of the exhaust 

bottom and exhaust flange were reported, which could lead to toxic 

contamination inside the cabin. 

Background information: This inspection was initially addressed by Austrian 

AD A-2004-005R1 dated 05 October 2004. The design of the exhaust 

muffler has been changed by design chance F33-12 for Part Number 

979402 and F36-13 for Part Number 979404 and was introduced into 

serial production. 
2/2 

The initial repetitive AD inspection interval of 50 Hrs was also applicable for 

this design. The investigation of the inspections carried out, has identified 

that the new exhaust muffler design eliminated the design problem and no 

additional inspection is required. 

EASA AD 2006-0121 superseded Austrian AD A-2004-005R1. 

This AD supersedes AD 2006-0121 due to deletion of a note in the 

applicability field which was excluding some serial numbers of the Exhaust 

Muffler Part No. 979402. 

Effective Date: 31 May 2006 

Compliance: Inspection: 

 Initial Inspection within 50 Hrs Time-in-Service (TIS) after AD effective 

date . 

 Repeat this inspection every 50 Hrs of operation. 

Ref. Publications: BRP-Rotax GmbH & CoKG Mandatory Service Bulletin SB-914-028R1 

dated 8. November 2004 or later approved revisions. 

Remarks : 1. If requested and appropriately substantiated the responsible EASA 

manager for the related product has the authority to accept Alternative 

Methods of Compliance (AMOCs) for this AD. 

2. AD 2006-0121 was posted as PAD 06-048 for consultation on 06 March 

2006 with a comment period until 01 April 2006. No comment was raised 

during the consultation period. This AD is superseding AD 2006-0121 but 

no consultation is deemed necessary, due to change in the applicability 

only. 

3. Enquiries regarding this Airworthiness Directive should be referred to Mr. M. 

Capaccio, Airworthiness Directive Focal Point - 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 BRP-Rotax GmbH & Co. KG. 

(Ph.: +43 (0) 7246 6010; Fax: +43 (0) 7246 601 760).