engine air inlet filter system service instruction (si)

8/2/2019 Engine Air Inlet Filter System Service Instruction (Si)

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TACTICAL AEROSPACE CORPORATION

ENGINE FILTERHughes 500OH6 SeriesSYSTEMA-CI-3

This document provides information necessary for maintenance and servicing of the engine filtrationsystem to allow for safe operation and continued airworthiness.

TAC ENGINEERING APPROVED

SERVICE APPROVED PREPARED BY

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SERVICE INSTRUCTION NO. 500EFS/SRV

SECTION 1. INTRODUCTION

l-l GENERALThe engine filter system is designed to protect the turbine engine fromforeign object damage and micro erosion when operating in normal and severeenvironmental conditions. The system consists of a duct, filter element, low inlet

pressure annunciation system, and a pilot actuated alternate system.The filter element is comprised of a specially formulated polymerized oil,suspended by a pleated wire cloth /cotton fabric matrix for the purpose ofattracting and holding airborne dust particles.The filter element is serviced by cleaning and re-oiling at regularintervals, or upon requirement resulting from either performance loss or visual

determination that performances could be adversely affected prior to nextscheduled servicing. The electrically actuated alternate air system should bechecked for correct operation at the time of 50 hour inspection, or prior to flightinto environmental conditions potentially requiring the use of alternate air.


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SERVICE INSTRUCTION NO. SOOEFS/SRV

SECTION 2: WIRING DIAGRAM

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SERVICE INSTRUCTION NO. 500EFSBRV

SECTION 3: AIRWORTHINESS LIMITATIONS

3- 1 SERVICE INTERVALSa. This section covers the basic maintenance and service proceduresnecessary for safe operation and continued airworthiness of the engine filtersystem. The service and inspection intervals designated herein are themaximum allowable and should not be exceeded. The filter element, whencarefully removed, handled, serviced, will provide 1000 hours of service.b. When severe or unusual environmental conditions exist or as operationalrequireqents dictate, it is the responsibility of the operator to increase thefrequency and scope of inspections necessary to ensure safe operation. Due tothe operational nature of a barrier type filter, an important criteria for safeoperation is a visually unobstructed inlet/filter. This can be accomplished byvisual inspection of the filter through the inlet prior to each flight. Where assmall suspended particles on the outside of the element do not cause anappreciable airflow restriction, large, obvious debris such as leaves, brush,litter, etc. should be removed prior to flight. Good judgment and practice willinsure safe operation as well as long filter life.C. Inspections, scheduled and conditional, shall be performed by qualifiedpersonnel and in accordance with standard aircraft practice. Compliance withall applicable Service Bulletins and Airworthiness Directives is mandatoty.

d. The regular service intervals are as follows:1) Visual inspection of element prior to each flight.2) Cleaning and reapplication of oil: 100 hours/On condition3) Element replacement: 1000 hours/On condition

3-2 SYSTEM INSPECTION AND TESTINGa. The Engine Filter System consists of four major components/systems

1) Element (see Section 6 for service and inception instructions)2) Duct Structure and Mounting Components3) Low Inlet Pressure Warning System4) Alternate Air Source System

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SERVICE INSTRUCTION NO. 500EFSISRV

3-2 SYSTEM INSPECTION AND TESTINGb. The following should be inspected at 100 hour intervals:

1) Service Element2) Sealing

(cant)

C.

a) visual check for a adequate seal between duct and airframe.b) visual check element to duct seal (D shaped seal)3) General visual inspection of electrical and plumbing connections.4) Cycling of alternate air door for proper function

The following should be inspected at 300 hour intervals:.,?1)2)3)4)

6)

Service Element (see Section 6)Inspect element/duct fasteners for proper serviceVisually inspect seals for cracking or deteriorationCheck all composite components for cracks, loose, or missing rivets,chafing, or other abnormalitiesCheck alternate air system for proper operation (hinge, spring,hardware)

6) Inspect all hardware and fasteners for proper functioning

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SERVICE INSTRUCTION NO. SOOEFSBRV

SECTION 4: FILTER ELEMENT SERVICING

4.~1 GENERALTo insure proper function and maintain a high level of filtration efficiency

great care should be taken when handling the element. The element is mostlikely to be damaged durfng servicing than in operation. Special care should betaken when removing and reinstalling the inlet cowling, as well as whenremoving and replacing the element from the duct. The pleated materialsfragile wire mesh is easily damaged or deformed when allowed to scrapeagainst other components. Careful attention to the following section will assurefull service from the filter element.

4.2 REM&AL AND REINSTALLATION4b)

Remove the inlet, DO NOT SCRAPE COWLING ON FILTER MEDIA.Loosen the ten l/4- turn fasteners holding the element in place andcarefully remove it from the duct. Care should be taken when moving theelement past the transmission oil cooler.

c) Reinstallation is reverse of above. Se sure the pins at the aft end of theelement are seated in the recepticles.

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SkRVICE INSTRUCTION NO. 500EFS/SRV

SECTION 4: FILTER ELEMENT SERVICING (cant)

4-3 FILTER ELEMENT CLEANINGa. Holding the element clean side up, gently tap the element to dislodge any largeimbedded debris and dirt.b. Use only TAC filter cleaner, PN 40- 15Spray INTEC Filter Cleaner liberally onto the entire element and allow to permeate for ten minutes.Aftematively. soak the element in a shallow pan of filter cleaner and allow to permeate for tenminutes.

DO NOT use Gasoline00 NOT use Jet A or KeroseneDO NOT use Caustic Cleaning SolutionDQ NOT use DetergentsDO NOT use Parts Cleaning SolventsDO NOT use Pressure or Steam CleanersDO NOT use High Pressure Hose Nozzles

Failure to service the element correctly will harm the filter media by reducing its filtration efficiencyand/or service life.C. Rinse the element with low pressure water from a garden hose. Always flush from theinside to the outside to avoid driving particles further into the filter media.d. Allow the element to dry naturally. After rinsing, gently shake off the excess water and setthe filter aside.

DO NOT use Compressed AirDO NOT use Open FlameDO NOT use Hair Dryers or Heat Guns

Excess heat will cause the filter media to shrink and high pressure air will open small holes thatallow dirt to pass.

4-4 OILING THE FILTER ELEMENTa. Use only TAC Filter Oil, PN 40 - 10INTEC Filter Oil is a compounded mineral and animal oil blended formulated with special polymersto form the tack barrier. A red dye has been added to show where the oil has been applied.Eventually the, red color will fade but the oil will remain.b. InspectionPrior to reoiling the filter element, hold the clean dry element up to a light source and check forany large holes in the media. The small pinholes seen are normal and will not allow dirt to passonce the element has been oiled. Close larger holes with a sharp object such as a paper clip bycarefully pushing and bunching together the cotton media. Check the outside of the element forbroken wires or cut media.

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engine air inlet filter system service instruction (si)

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