Piston Engine Oil & Filter Element - Inspection



                 CASA issued AIRWORTHINESS BULLETIN Piston Engine Oil & Filter Element - Inspection AWB 85-013 Issue : 1 Date : 14 November 2012
                     Applicability : All aircraft piston engines - particularly those equipped with “disposable” or “spin-on” oil filtration “paper” element cartridges.
                       Purpose : Advise all aircraft owners, operators and maintenance personnel to cut open the canister of disposable oil filters and examine the element and to emphasise the importance of thorough oil filter element inspections and proper evaluation of filter debris to assist in the determination of engine serviceability and need for corrective action.
Background
                            Clean engine oil is fundamental to engine durability and reliability in operation. The engine oil system cools, reduces friction between moving parts and flushes potentially harmful wear particles away from contacting surfaces as it circulates through the engine. As it does so, the oil becomes increasingly contaminated. The engine oil filters help reduce wear by collecting these harmful particles from the oil.
                             Many light aircraft piston engines are equipped with simple oil screens – usually a fairly coarse mesh screen on the suction side of the oil pump and a much larger and finer screen on the pressure side of the oil pump. Micronic paper “spin-on” filter elements have proved quite effective in maintaining cleaner oil via much improved oil filtration and the increased ability to provide early clues to the internal health of the engine - and of impending failure.
                            Many SDRs received by CASA demonstrate that a potential in-flight engine failure has been avoided by early detection of adverse internal wear or damage by careful examination of the oil and oil filter contents. Recent reports, however, indicate that some operators/maintainers may be either failing to look for metal debris in the screens and filter, or failing to properly evaluate what was found at the oil filter inspection immediately prior to catastrophic engine failure.
                      In addition to regular oil filter analysis, some manufacturers recommend that operators use spectrographic means to analyse the oil to monitor trends in minute levels of brass, bronze, aluminium, steel and silicone, etc. Whilst particulate in the sub-microscopic to microscopic range is undetectable during a visual inspection of the filter element contents, this analysis method is a valuable tool for monitoring the health of piston engines where available.

For Details : https://www.box.com/s/8mo53ryyzgow9dviuekr

Comments

Post a Comment

Popular posts from this blog

Cessna 152 Magneto Check

MAGNETO CHECK. NEVER ADVANCE TIMING BEYOND SPECIFICATIONS IN ORDER TO REDUCE RPM DROP. Too much importance is being attached to RPM drop in single ignition. RPM drop on single ignition is a natural characteristic of dual ignition design. The purpose of the following magneto check is to determine that all cylinders are firing. If all cylinders are not firing, the engine will run extremely rough and cause for investigation will be quite apparent. The amount of RPM drop is not necessarily significant and will be influenced by ambient air temperature, humidity, airport altitude, etc. In fact, absence of RPM drop should be cause for suspicion that the magneto timing has been bumped up and is set in advance of the setting specified. Magneto checks should be performed on a comparative basis between individual right and left magneto performance. a. Start and run engine until the oil and cylinder head temperatures are in normal operating ranges. b. Advance engine speed to 1700 RPM. c. Tu...
Read more

Brake System Cessna 172

                             BRAKE SYSTEM -MAINTENANCE PRACTICES              1. Description and Operation A. The hydraulic brake system is comprised of two master cylinders, located immediately forward of the  pilot’s rudder pedals, brake lines and hoses, and single-disc, floating cylinder brake assemblies located at  each main landing gear wheel. B. The parking brake system is comprised of a pull-type handle and mechanical connections which are  linked to the rudder pedal assembly. Pulling aft on the brake handle applies mechanical pressure to the  rudder pedals, activating the brakes and locks the handle in place. Turning the handle 90 degrees will  release the parking brake and allow for normal operation through the rudder pedals. C. Brake operation is accomplished by pushing on the upper part of each rudder pedal. This motion i...
Read more

McCauley Propeller Installation fixed pitch

Image
Propeller Installation for all fixed pitch propellers (except 1A162 model propellers).                   WARNING: MAKE SURE THE MAGNETO IS GROUNDED BEFORE INSTALLING  THE PROPELLER OR CONNECTING EXTERNAL POWER.                NOTE: McCauley recommends that propeller mounting nuts (if applicable) be replaced at each  propeller installation, whenever possible. However, nuts may be reused providing the threads are in good condition and the locking material prevents turning of the nut on the  stud by hand. Propeller mounting bolts must be magnetic particle inspected in accordance  with ASTM E-1444 or replaced whenever the propeller is removed from the engine.                NOTE: The aircraft maintenance manual or STC installation instructions should always be  consulted for any specialized procedures applicable to a specific aircraft....
Read more