EASA AD No : 2009-0100 

EASA Form 110 Page 1/2 

EASA AIRWORTHINESS DIRECTIVE 

AD No.: 2009-0100 

Date: 04 May 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 Airworthiness Directive applies, except in accordance with the requirements of that Airworthiness Directive 

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 : 

MICROTURBO 

Type/Model designation(s) : 

SAPHIR 2 Auxiliary Power Units 

TSO authorization : Letter 4188 DTA/M dated 19 July 1971 

Foreign AD : Not applicable 

Supersedure : None 

ATA 49 Auxiliary Power Unit – Exhaust Thermal Insulation – 

Replacement 

Manufacturer(s): Microturbo 

Applicability: Microturbo SA Saphir 2 Model 016 Auxiliary Power Units (APUs) on which 

the exhaust thermal insulation has been replaced since 01 January 1995. 

These APUs are known to be installed on, but are not limited to, Dassault 

Falcon 20 aeroplanes. 

Reason: Due to a lapse in manufacturing quality control, the exhaust thermal 

insulation of certain Microturbo SA Saphir 2 Model 016 APUs may not meet 

the approved design standard, and may fail in service. The affected part 

numbers are 016-33-01 (Inner Thermal Insulation), 016-33-02 (Outer 

Thermal Insulation) and 016-33-03 (EGT Sensor Thermal Insulation). Only 

parts replaced since 1995 are affected. 

This condition, if not corrected, could result in rapid deterioration and 

physical breakdown of the exhaust thermal insulation, leading to loss of 

insulation efficiency and ultimately exposure of the hot APU exhaust 

section and risk of fire. 

Since the issue of Safety Information Notice (SIN) 2007-23, EASA has 

issued AD Policy (document C.Y001-01 dated 28 July 2008), confirming 

the Agency to be competent to issue Mandatory Continuing Airworthiness 

Information to require correction of unsafe conditions resulting from 

production and/or maintenance deficiencies. 
EASA AD No : 2009-0100 

EASA Form 110 Page 2/2 

For the reasons described above, this AD replaces SIN 2007-23, requiring 

the inspection and replacement of affected exhaust thermal insulation. 

Effective Date: 18 May 2009 

Required Action(s) and 

Compliance Time(s): 

Required as indicated unless accomplished previously. 

1. Within 10 APU operating hours from the effective date of this AD, if the 

exhaust thermal insulation has been replaced since 01 January 1995, 

inspect the exhaust thermal insulation for signs of deterioration. 

Repeat the inspection at intervals not exceeding 10 APU operating 

hours. If deterioration is detected, replace the exhaust thermal 

insulation before operating the APU again, in accordance with the 

accomplishment instructions in the referenced Microturbo Alert Service 

Bulletin. 

2. Within 50 APU operating hours from the effective date of this AD, if the 

exhaust thermal insulation has been replaced since 01 January 1995, 

replace the exhaust thermal insulation in accordance with the 

accomplishment instructions in the referenced Microturbo Alert Service 

Bulletin. 

Ref. Publications: Microturbo Alert Service Bulletin 49-11A76 Revision 1, 

dated 6 September 2007 

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 20 February 2009 as PAD 09-043 for 

consultation until 20 March 2009. The Comment Response Document 

can be found at http://ad.easa.europa.eu. 

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: 

MICROTURBO - Support Clients, 8, Chemin du pont de Rupé, 

BP 62089 31019 Toulouse - Cedex 2 – FRANCE 

Telephone +33 (0)5 61 37 55 00; Fax: +33 (0)5 61 70 74 45 

E-mail technical.support@microturbo.fr