EASA AD No.: 2015-0010R1

TE.CAP.00110-004 © European Aviation Safety Agency. All rights reserved. 1/2

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EASA AIRWORTHINESS DIRECTIVE

AD No.: 2015-0010R1

Date: 04 February 2015

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 EU 748/2012, Part 21.A.3B. In accordance with EU 1321/2014 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 

[EU 1321/2014 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:

GROB AIRCRAFT AG

Type/Model designation(s):

G 115 and G 120 aeroplanes

TCDS Numbers: EASA.A.364 and EASA.A.075

Foreign AD: Not applicable

Revision: This AD revises EASA AD 2015-0010 dated 16 January 2015, which superseded

EASA AD 2014-0212 dated 19 September 2014.

ATA 80 Starting – Starter Solenoid – Inspection / Modification

Manufacturer(s): GROB Aircraft AG (formerly Grob Aerospace GmbH, Grob Werke GmbH & 

Co. KG).

Applicability: GROB G 115E and G 115EG aeroplanes, all serial numbers (S/N) up to and 

including S/N 82323/E, and

GROB G 120A and G 120A-I aeroplanes, all S/N up to and including S/N 

85063.

Reason: An operator of a G 115E aeroplane experienced a total loss of electrical power 

in flight. The investigation found that a defective starter solenoid had caused

an internal short circuit which resulted in breakdown of the system voltage.

This condition, if not detected and corrected, could result in reduced control of 

the aeroplane. 

To address this potential unsafe condition, GROB Aircraft AG issued 

Mandatory Service Bulletin (MSB) MSB1078-196 for G 115 aeroplanes and

MSB1121-144 for G 120 aeroplanes to provide instructions for inspection and 

corrective action. Consequently, EASA issued AD 2014-0212 to require a onetime inspection of the starter solenoid and, depending on findings, 

replacement of the starter. In addition, for G 115E aeroplanes, installation of a 

placard was required.

More recently, GROB Aircraft AG developed a modification to avoid loss of 

electrical power in case of electrical shortage in the starter solenoid, which 

was published in revised GROB MSB1078-196/1 and MSB1121-144/1. 

Prompted by this development, EASA issued AD 2015-0010, retaining the 

requirements of EASA AD 2014-0212, which was superseded, and required

installation of a starter relay.
EASA AD No.: 2015-0010R1

TE.CAP.00110-004 © European Aviation Safety Agency. All rights reserved. 2/2

Proprietary document. Copies are not controlled. Confirm revision status through the EASA-Internet/Intranet.

Since that AD was issued, operator comments have indicated the existence of 

a logistical problem, resulting in the unnecessary grounding of aeroplanes.

For the reason described above, this AD is revised to amend paragraph (3), 

extending the compliance time for modification.

Effective Date: Revision 1: 04 February 2015

Original issue: 30 January 2015

Required Action(s) 

and Compliance

Time(s):

Required as indicated, unless accomplished previously:

Re-statement of the requirements of EASA AD 2014-0212:

(1) Within 30 days after 03 October 2014 [the effective date of EASA AD

2014-0212], inspect the starter solenoid in accordance with the 

instructions of GROB MSB1078-196 or MSB1121-144, as applicable to

aeroplane type. In addition, for G 115E aeroplanes, install a placard « IFR 

operation in VMC only » on the instrument panel in full view of the pilot in 

accordance with the instructions of GROB MSB1078-196.

(2) If, during the inspection as required by paragraph (1) of this AD, any 

damage to the starter is found, before next flight, replace the affected 

starter with a serviceable part in accordance with the instructions of 

GROB MSB1078-196 or MSB1121-144, as applicable to aeroplane type.

New requirements of this AD:

(3) Within 100 flight hours after 30 January 2015 [the effective date of the 

original issue of this AD], install a starter relay in accordance with the 

instructions of GROB MSB1078-196/1 or MSB1121-144/1, as applicable 

to aeroplane type. Concurrent with the modification of G 115E 

aeroplanes, the placard as required by paragraph (1) of this AD can be 

removed from the instrument panel.

Ref. Publications: GROB Aircraft AG MSB1078-196 original issue dated 14 July 2014 or 

MSB1078-196/1 dated 01 December 2014.

(for G 115E and G 115EG).

GROB Aircraft AG MSB1121-144 original issue dated 14 July 2014 or 

MSB1121-144/1 dated 12 January 2015.

(for G 120A and G 120A-I).

The use of later approved revisions of these documents 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 the required actions and the compliance time, EASA have 

decided to issue a Final AD with Request for Comments, postponing the 

public consultation process until after publication.

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

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:

GROB Aircraft AG, Product Support

E-mail: productsupport@grob-aircraft.com.