SERVICE BULLETIN INFORMATION: 912i / 912 / 914 Series push-rod inspection

Ref: ATA 72-30-00
Cylinder head


 

Service Bulletin Information
SB-912 i-008 / SB-912-070 / SB-914-052
 

Inspection and/or replacement of the valve push-rod assembly, rocker arm left and rocker arm right for ROTAX® Engine Type 912 i, 912 and 914 (Series)

 

 
This Service Bulletin applies to a limited range of 912iS, 912, and 914 (Series) engines, as well as valve push-rod part number 854861 spare parts produced from June 8th, 2016 through October 2nd 2017. Engines that have received replacement pushrods following repair or overhaul after June 8th 2016 are also affected.

NOTE: This bulletin explains the range of push-rods to be inspected, and how any push-rods found with "black" plating are to be replaced by push-rods with "silver" (silver-grey) plating. This bulletin does not apply to any engines or spare parts produced before June 8th, 2016.

EXAMPLE
 

 

Additional Information
 

 

What is this Service Bulletin about and how does it affect me?

Due to deviations in the manufacturing process of the valve push-rod assembly, partial wear on the rocker arm ball socket may occur. This wear might lead to a rocker arm cracking / fracture which in consequence may lead to a malfunction of the valve train. Possible effects are rough running engine or an unusual engine operating behavior.

If your engine falls within the affected S/N range listed within the bulletin, an inspection and/or replacement of the valve push-rod is necessary.

If your engine doesn’t fall within the S/N range listed within this Service Bulletin, your engine may still be affected if the pushrods have been replaced after June 8th, 2016 during overhaul or repair.

When must the inspection take place if my engine is affected?

• Before the initial installation in an aircraft and/or the initial start-up thereafter.
• At the next ROTAX® scheduled maintenance event or within the next 25 hours of operation, but at the latest after 200 days (from the date of the initial issue of this Service Bulletin).
• In the event of a rough running engine , or unusual engine operating behavior, carry out inspection in accordance to this Service Bulletin before the next flight.

NOTE:
All affected parts cannot be re-used and must be returned F.O.B to ROTAX® Authorized distributors or their independent Service Centers. Further sale, use or shipment of all valve push-rods part no. 854861 produced in the affected time period (as of June 08th, 2016 until October 02nd, 2017), in stores (e.g. replacement parts) are also affected, must undergo a visual inspection of valve push-rods as per section 3.1.2 of this SB and if found not OK must be returned F.O.B. to ROTAX® Authorized distributors or their independent Service Centers.

How much will it cost if my engine is affected?

• No estimated labor hours are given as labor time will depend on airframe installation.
• Price and availability will be provided on request by ROTAX® Authorized Distributors or their independent Service Centers.
• Shipping costs, downtime costs, loss of income, telephone costs etc. or costs of conversion to other engine versions or additional work, as for instance simultaneous engine overhauls are not covered in this scope and will not be borne or reimbursed by ROTAX®

What must be done if my engine is affected?

If your engine falls within the affected S/N range listed within the bulletin OR had the valve push rods replaced after June 8th 2016, a visual inspection of the pushrods must be accomplished following the instructions found within the Service Bulletin.

 

Color Evaluation
Silver Surface Valve push-rod is OK. 
No further action required for this valve push-rod.
Black Surface Valve push-rod is NOT OK.
 
(silver-black comparison)
 

 

Who can do the inspection and work?

Inspection of the pushrods must be accomplished by an approved technician in accordance with the instructions found within the Service bulletin.

If the pushrods are affected they are required to be changed and all measures must be implemented and confirmed by at least one of the following persons or organizations:
  • ROTAX® - Airworthiness representatives
  • ROTAX® - Authorized Distributors or their independent Service Centers
  • Persons approved by the respective Aviation Authority
  • Persons with approved qualifications for the corresponding engine types. Only authorized persons (iRMT, Level Heavy Maintenance) are entitled to carry out this work.

NOTE: All work must be performed in accordance with the relevant Maintenance Manual and special tooling IS required when replacing the affected pushrods. In most cases the work can be performed with the engine installed in the aircraft.


 

 

This Service Bulletin Information release does not supersede the instructions found within the Service Bulletin or the relative manual references. The instructions contained within the Service bulletin and manual references must be followed!

 

 

 

Read the Service Bulletin

Read the UL Service Bulletin 

 

For Europe: the relevant EASA AD can be found here