General Maintenance Practices on Light- Sport Rotax Engines  Maintenance Schedule Procedures and  Maintenance Checklist Some specific maintenance practices that differ from  conventional certified engines is covered for background  and educational acquaintance purposes only. Always refer  to the current manufacturer’s information when performing  maintenance on any engine.  Safety regulations must be adhered to ensure maintenance  personnel safety when performing maintenance and service  work on any engine installation. The following information  should be followed while performing maintenance. The ignition should be off and the ignition system grounded  with the battery disconnected. Secure the engine against  unintentional operation. During maintenance work that  requires ignition on and battery connected, secure the propeller  against unintentional turning by hand, and secure and observe  a propeller safety zone. This precautionary measure serves  to avoid any injuries in case of an unintentional start of the  engine, which can result in injuries or death. Remember, as  long as the ground-cable (plead) is not properly connected  to ground, the ignition is switched ON (hot). Prevent contamination, such as metal chips, foreign material,  and/or dirt, from entering the cooling, lubricating, and fuel  system during maintenance. Severe burns and scalds may  result if the engine is not allowed to cool down to outside  air temperature before starting any work. Before reusing  disassembled parts, clean with a suitable cleaning agent,  check, and refit per instructions. Before every re-assembly,  check for missing components. Only use adhesives,  lubricants, cleaning agents, and solvents listed for use in the  maintenance instructions. Observe the tightening torques for  screws and nuts; overtorque or too loose connection could  cause serious engine damage or failure.  The following are some general maintenance practices that  provide for safety and good technique: Checks are carried out per the maintenance checklists,  where type and volume of maintenance work is outlined  in key words. The lists must be photocopied and filled out  for each maintenance check. The respective check (e.g.,  100-hour check) must be noted on the top of each page  of the maintenance checklist. All the maintenance work  carried out must be initialed in the signature area by the  aircraft mechanic performing the task. After maintenance,  the completed checklists must be entered in the maintenance  records. The maintenance must be confirmed in the log book.  All discrepancies and remedial action must be recorded in  a report of findings to be generated and maintained by the  company authorized to carry out maintenance work. It is the  responsibility of the aircraft operator to store and keep the  records. Replacement of equipment (e.g., carburetor, fuel  pump, governor) and execution of Service Bulletins must be  entered in the log book, stating required information.  All stated checks are visual inspections for damage and  wear, unless otherwise stated. All listed work must be carried  out within the specified period. For the intervals between  maintenance work, a tolerance of + or – 0 hour is permissible,  but these tolerances must not be exceeded. This means that  if a 100 hour check is actually carried out at 110 hour, the  next check is due at 200 hour + or – 10 hour and not at 210  hour + or – 10 hour. If maintenance is performed before the  prescribed interval, the next maintenance check is to be done  at the same interval (e.g., if first 100-hour check is done  after 87 hours of operation, the next 100-hour check must  be carried out after 187 hours of operation). To perform maintenance, the technician must follow the  manufacturer’s instructions. Obtain, read, and understand  the information pertaining to servicing of the light-sport or  experimental engine.  •  Check the contact faces and threads for damage and  replace if any damaged is detected.  •  At reassembly of the engine, replace all sealing rings,  gaskets, securing elements, O-rings, and oil seals. •  At disassembly of the engine, mark the engine’s  components as necessary to provide for locating the  original position of the part. •  Parts should be replaced in the same position upon  reassembly. •  Any used components have wear patterns that should  be replaced or matched if reused. Ensure that these  marks are not erased or washed off. •  Work only in a non-smoking area and not close to  sparks or open flames. •  Always use the specified tools.  •  During disassembling/reassembling the removal of  any safety items (e.g., safety wiring, self-locking  fastener) must always be followed with replacement  of a new one.  •  Once loosened, always replace self-securing (locking)  nuts.  •  Use clean screws and nuts only and inspect face of  nuts and thread for damage.  11-17