Rotax 912 and 914 Engines: Reciprocating Engine – Valve Push Rod Assembly – Inspection / Replacement

Rotax 912 and 914 Engines: Reciprocating Engine – Valve Push Rod Assembly – Inspection / Replacement

Applicability: Rotax 912 iS Sport, 912UL, 912ULS, 914UL engines. For Serial numbers affected refer to Rotax SB SB-912 i-008iS/SB-912-070UL / SB914-052UL at latest revision

Reason:  Power loss and engine RPM drop have been reported on Rotax 912/914 engines in service. It has been determined that, due to a quality control deficiency in the manufacturing process of certain valve push-rod assemblies manufactured between 08 June 2016 and 02 October 2017 inclusive, partial wear on the rocker arm ball socket may occur, which may lead to malfunction of the valve train. This condition, if not detected and corrected, may lead to rough engine operation and loss of power, possibly resulting in a forced landing with consequent damage to the aeroplane and injury to occupants. To address this potential unsafe condition, BRP-Rotax issued Service Bulletin (SB) SB-912 i-008 / SB-912-070 / SB-914-052 (single document), providing applicable instructions. For the reason described above, this MPD requires a one-time inspection and, depending on findings, replacement of affected parts. This MPD also prohibits installation of affected parts on an engine. This MPD, for the uncertified engine variants, mirrors the EASA AD 2017-0208, which was for the certified engine variants.

Compliance/ Action: Required as indicated unless accomplished previously:

Note 1: Valve push-rod assemblies Part Number (P/N) 854861 are hereafter referred to as “valve push-rod”.

Note 2: BRP Rotax SB-912 i-008 / SB-912-070 / SB-914-052 (single document) is hereafter referred to as “the SB” (see link below).

Note 3: BRP Rotax SB-912 i-008iS / SB-912-070UL / SB-914-052UL (single document) is hereafter referred to as “the Applicability SB”

Note 4: Group 1 engines are those having a serial number (s/n) as listed in the Applicability SB (see Note 3); or an engine, having any s/n, on which a valve push-rod (see Note 1) has been replaced in service between 08 June 2016 and 18 February 2018 inclusive. Group 2 engines are those that are not Group 1.

Inspection: (1) For Group 1 engines (see Note 4): Within the compliance time identified in Table 1 below, as applicable, visually inspect the push-rod ball sockets of each valve push-rod in accordance with the instructions of the SB.

Table 1 – Visual Inspection of Affected Assembly

Engine Flight Hours (FH) since first installation on an aircraft Compliance Time


160 FH or less


Before exceeding 170 FH since first installation of the engine on an aircraft, or within 3 months after 18 February 2018, whichever occurs first.
More than 160 FH


Within 10 FH or 3 months, whichever occurs first after 18 February 2018.

Corrective action: (2) If, during the inspection as required by paragraph (1), a valve push-rod having black surface is detected (reference Fig. 1 in the SB), before next flight, replace that valve push-rod and its affected parts (see Note 5) with serviceable ones in accordance with the instructions of the SB.

Note 5: Affected parts are listed in Table 2.

Table 2 – Affected Part



Part Number


Vale push-rod assembly




Rocker arm left




Rocker arm right




Part installation: (3) For Group 1 and Group 2 engines: From the 18 February 2018, it is prohibited to install on any engine a valve push-rod (see Note 1) manufactured between 08 June 2016 and 02 October 2017 inclusive.


Further information is available at the following links:

Service Bulletin Information Release

The Service Bulletin

The UL Service Bulletin 

EASA Airworthiness Directive (Certified Aircraft Only, included for Reference)

UK CAA Mandatory Airworthiness Directive

Two Successful Flight Tests at Tibohine Flying Club

Two Successful Flight Tests at Tibohine Flying Club

Congratulations to Shane Kelly from Co. Roscommon and Shane McGirr from Co. Donegal who both passed their flight tests at Tibohine Flying Club in the last couple of weeks. Both flight tests were conducted by IAA Examiner Jack Ledwith. For more details about Tibohine Flying Club visit here.

Examiner Jack Ledwith and Shane Kelly

Shane McGirr with Examiner Jack Ledwith


The NMAI AGM will take place in The Irish Parachute Club, Clonbullogue, Co. Offaly on Sunday 08/05/2016. Every member is requested to attend this meeting as there are a few changes coming and we want you all to have you say . Can members also inform us if you intend on flying to this event as we will have to arrange aircraft parking. If attending by air please text Mark Brereton on 087 6617115 just to let us know.

The AGM is your chance to improve how your sport is run. The NMAI Committee work hard to keep the sport safe and we are rapidly growing, with more and more aircraft joining our books each week, so attend and show your support.
If the weather is good there will be a BBQ in Limetree Airfield later on that evening and all are welcome to attend.

Inspectors Meeting Cancellation

Due to unforeseen circumstances, the Inspectors Meeting scheduled for the 7th of November has been postponed. A new date will be issued shortly. Apologies for any inconvenience caused to our inspectors and members.

Class II Medical

Class II Medicals will be available on Saturday, the 31st of October in Abbeyshrule Aerodrome. Places are limited, so contact Mark Brereton on 0876617115 or by email to to reserve a place.

Registration Marks

Notice to all aircraft owners – please ensure that the registration marks on your aircraft adhere to the guidelines. In particular, the hyphen should be two-thirds the height of the general letters and the markings under the wing need to read from left to right, and be at least 50cm in height. If you are changing the registration marks of your aircraft in the near future, consult IAA (Nationality and Registration Order) SI number 107 of 2015. This document is available on the IAA website, or simply follow the link [Go to pages 16-17]:

Inspectors Meeting, 7th November

There will be an inspectors meeting on Saturday, the 7th of November. This meeting is compulsory for all NMAI Inspectors. The meeting will be held in Limetree Airfield and will commence at 10:30. If you have any issues and/or queries, contact the Tech Office by email to If you cannot attend on this date please let us know in advance.

Temporary Restricted Airspace

The NMAI would like to alert it’s members of the upcoming TRA’s:

1) Bray Airshow on the 17th & 19th July 2015

2) Monavullagh Mountains, Dungarvan, Co. Waterford on the 21st July 2015

3) Foynes County Limerick, Sunday 26th July 2015

If you are planning on flying in the vicinity of the effected areas, it is advised to take these restrictions into account prior to departure. The full details of the restrictions are available on the IAA website, or simply follow the link provided;

Revision of Check Flight Certificate

The latest revision of NMAI/AW/007 R2, ‘Certificate of Fitness for Flight,’ was approved by the IAA on 01/07/15.

Revision 2 was updated to include a provision for ferry flights. This revision is to facilitate the transport of aircraft to testing centres.

The latest version of the form is now live on the website, look for Form No.007 in, ‘Download Documents,’ in the Technical section, or simply follow the link;

Limetree Fly-In 2015

Limetree Airfield will host their annual fly-in event to coincide with the end of the ‘Round Ireland Air Rally. The fly-in will commence on the 2nd of August with live music and a BBQ in the hanger. On the 3rd of August there will be various flying activities for all the family, including parachute displays, the Coast Guard Helicopter, BBQ and bouncing castles for the kids. Also on the 3rd there will be competitions for the pilots, such as spot landing competitions, with free entry to all NMAI members.

2015 New Fly-In Updated