AviZone

It is important to remember that long-term preservation of engines can result in trapping large amounts of oil in the combustion chambers of one or more cylinders. For this reason, engines should not be rotated until all of the preservative oil is drained away. Failure to do so can result in damage to the piston, connecting rod, and crankshaft of the flooded cylinder. Remove seals and all desiccant bags. Remove cylinder dehydrators and plugs or spark plugs from upper and lower spark plug holes. Remove oil sump drain plug and drain the corrosion preventive mixture. Replace drain plug, torque and safety. Replace and safety the oil filter. Rotate propeller by hand several revolutions to remove preservative oil. Service the engine with lubricating oil. Service and install spark plugs and ignition leads. Service en-gine and aircraft in accordance with the manufacturer's instructions. Thoroughly clean the aircraft and engine. Perform visual inspection. Correct any disc...

                    Both manufacturers Lycoming and Continental agree that inactivity in excess of 30 days strongly suggests the need for some special preservation methods and chemicals, especially if the aircraft is located near salt water or similar humid environment. Lycoming Service Letter SL180 Engine Preservation for Active and Stored Aircraft Lycoming's procedure is as follows:          Install a preservative by one of the following methods: Drain the lubricating oil from the sump or system and replace with a preservative oil mixture. This preservation mixture consists of one part by volume MIL-C-6529C Type I concentrated preservative compound added to three parts by volume of MIL-L-6082C (SAE J1966), Grade 1100, mineral aircraft engine oil or oil conforming to MIL-C-6529C Type II. Follow carefully the manufacturer's instructions before use.          An alternative...

Subject - Oxygen – Flight Crew Oxygen Mask Regulator – Identification / Operational Procedure / Replacement Applicability - Flight crew oxygen mask regulators, having Part Number (P/N) MC10, MF10 and MF20 series, with serial numbers (s/n) as listed in Appendix 1 of this AD. The affected flight crew oxygen masks regulators are known to be installed on, but not limited to, aeroplanes manufactured by Airbus, ATR, Boeing, Bombardier (formerly Canadair, De Havilland Canada), Cessna, Gulfstream and McDonnell Douglas. Reason In a repair station, improper maintenance on oxygen mask regulators was reported to Intertechnique: during an inspection of the oxygen test bench by its manufacturer, incorrect settings were noticed. This test bench setting discrepancy on the oxygen mask regulator could cause an improper mask dilution schedule.            This condition, if not detected and corrected, could lead, in case of a diversion above 10 000 feet after...

                        It is important to remember that long-term preservation of engines can result in trapping large amounts of oil in the combustion chambers of one or more cylinders. For this reason, engines should not be rotated until all of the preservative oil is drained away. Failure to do so can result in damage to the piston, connecting rod, and crankshaft of the flooded cylinder.                           To return the aircraft to service, remove seals, tape, and desiccant bags. Use a solvent to remove tape residue. Remove spark plugs or dehydrator plugs.  With the magnetos off, rotate the propeller by hand through sufficient rotations to remove excess preservative oil from the cylinders. Drain the remaining preservative through the sump.                    Most engines are equipped with a qui...

                  Note the factory is quoted verbatim here per Lycoming SL 180B: "Pulling engines through by hand when the aircraft is not run or flown for a week or so is not recommended. Pulling the engine through by hand prior to start or to minimize rust and corrosion does more harm than good. The cylinder walls, piston, rings, cam and cam followers only receive splash and vapor lubrication. When the prop is pulled through by hand, the rings wipe oil from cylinder walls."                   "The cam load created by the valve train wipes oil off the cam and followers. After two or three times of pulling the engine through by hand without engine starts, the cylinders, cam and followers are left without a proper oil film. Starting engines without proper lubrication can cause scuffing and scoring of parts resulting in excessive wear."                ...

                             Cessna strongly recommends more frequent aircraft washing, cleaning, and inspections during the winter months to reduce the potential of corrosion forming on surfaces and structures.                    Operating aircraft during cold weather months is challenging and removal of ice, frost, or snow is essential for safe flight. In addition, airport use of runway de-icers and applications of de-icing/anti-icing fluids during winter weather events can add to corrosion concerns.                               We are aware that some local airports use potassium acetate or potassium formate- based runway de-icing products. While these types of de-icers are advertised to be environmentally friendly, they are known to have chemical properties similar to urea or sa...

                            Pratt & Whitney Canada (P&WC) has issued Service Bulletin (SB) No. 7630 affecting all Citation V and Ultra equipped with JT15D-5A and JT15D-5D engines.              A Commercial Support Program Notification (CSPN) No. 1006369R00 was also issued to offer assistance for operators to comply with the SB.                      The bulletin was issued following discovery of an unapproved bonding seal material application on some fuel cooled oil coolers (FCOCs).                  Operators are provided instructions to perform a one time inspection of the serial numbers found on the FCOCs for comparison to a list of suspect serials provided in Table 1 of the bulletin. The affected FCOCs are to be removed and replaced with another one not listed in Tabl...

                     In Winter Weather Conditions-Check Fan Rotation before Engine Start            All Models ATA: 71-00                       Operators are reminded that engines should be rechecked to ensure free fan rotation prior to an engine start in conditions with blowing snow, freezing rain or ice. Aircraft moved outdoors from heated hangars should also be given special attention. The heated surfaces can cause winter precipitation to rapidly melt and then re-freeze in engine inlets as the airplane is chilled to ambient temperatures outside. Nearly every year, Citation Customer Service receives reports of frozen engine fans due to ice buildup in winter weather events.                    Caution: To prevent possible engine damage from ingestion of ice, do not chip or scrape ice or sno...