INTEC
1206 SERIES-ICA-1
INSTRUCTIONS FOR
CONTINUED AIRWORTHINESS
STC SR00180SE
ENGINE INLET AIR FILTER SYSTEM
BELL 206 AND 407 SERIES HELICOPTERS
This supplement must be attached to the applicable Bell 206, A, A1, B, B1; Arrow Falcon OH58A, A+, C; Garlick
OH58A, A+, C Jet Ranger; Bell 206L1, L3, or L4 Long Ranger, Bell 407, FAA Approved Maintenance Manual when
the Engine Filtration System, P/N 1206IN1-600, 1206IN1-1600, 1206IN1-1601, 1206IN1-2600 or 1407IN1-600 is
installed in accordance with INTEC Supplemental Type Certificate (STC) SR00180SE. The information in this
manual supplements or supersedes the basic manual only in those areas listed.
THE SERVICE INFORMATION CONTAINED IN THIS DOCUMENT SUPERCEEDS THE SERVICE
INFORMATION SECTION CONTAINED IN DOCUMENT NO. 1206-EFS/SRV.
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INTEC
1206 SERIES-ICA-1
TABLE OF CONTENTS
TITLE
Introduction
General Product Information
Scope of ICA
Precautions
Definitions, Abbreviations, Acronyms and Symbols
Distribution
Airworthiness Limitations
Inspection/Test Requirement
General
Service Intervals
Filter Element Servicing
General
SECTION
1
PAGE
4
4
4
4
5
5
6
7
7
7
8
8
8
8
9
10
10
1.1
1.2
1.3
1.4
1.5
2
3
3.1
3.2
4
4.1
4.2
4.3
4.3.1
4.3.2
4.4
Removal and Reinstallation of Element
Filter Element Cleaning
Inspection - Severe Conditions
Inspection - Normal Conditions
Oiling the Filter Element
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INTEC
1206 SERIES-ICA-1
SECTION 1
Introduction
1.1
General Product Information
The engine filter system is designed to protect the turbine engine from foreign object damage
and micro erosion when operating in normal and severe environmental conditions. The
Model 1206 and 1407 Engine Filter Systems consist of a duct assembly, left & right filter
elements, low inlet pressure annunciator system, and a pilot actuated alternate air system.
The filter elements are comprised of a specially formulated polymerized oil suspended by a
pleated wire cloth and fabric matrix for the purpose of attracting and holding airborne dust
particles. These filter elements are serviced by cleaning and re-oiling at regular intervals, or
as required, based on engine performance loss or by visual inspection.
The pilot actuated alternate air system is provided to bypass the filter elements in the event
that engine performance is degraded due to filter blockage. The alternate air system should
be inspected at regular intervals or prior to flight into environmental conditions that may
require its use.
1.2
1.3
Scope of ICA
This manual describes the airworthiness limitations, service instructions, inspection
procedures, and testing of the engine filter systems and its individual components. Strict
adherence to the information given herein will assure maximum filtration benefit and
increased component life.
Precautions
The following precautions are used throughout this manual and are defined as follows:
WARNING: Maintenance procedure, practice, condition, etc. which if ignored could result in
personal injury or loss of life.
CAUTION: Maintenance procedure, practice, condition, etc. which if ignored could result in
damage or destruction of equipment.
NOTE: Maintenance procedure, practice, condition, etc. or a statement which needs to be
highlighted.
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INTEC
1206 SERIES-ICA-1
SECTION 1
Introduction (cont.)
Definitions, Abbreviations, Acronyms, and Symbols
The following are used throughout the manual
1.4
fl. oz.
in. lb.
∆P
Fluid Ounce
Inch Pound (torque)
Differential Pressure
EFS
STC
FAR
ICA
Engine Filter System
Supplemental Type Certificate
Federal Aviation Regulation
Instructions for Continued Airworthiness
1.5
Distribution
From time to time it may be necessary to revise or update information contained in this ICA.
Although best efforts will be made to distribute revisions and updates to the registered owner
of the product, it is ultimately the responsibility of the current user to ensure he or she is
using the most current information available. Additional copies of this ICA as well as
revisions and updates may be obtained by contacting Filtration Development Corporation
(FDC) at 415-884-0555. Additionally, you may register to receive these updates when they
are released. When revised pages are received, insertions should be logged on the Record
of Revisions page and the List of Effective Pages log should be updated.
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INTEC
1206 SERIES-ICA-1
SECTION 2
Airworthiness Limitations
The Airworthiness Limitations section is FAA approved and specifies
inspections and other maintenance required under §43.16 and §91.403 of the
Federal Aviation Regulations unless an alternate program has been approved.
No airworthiness limitations associated with this STC.
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INTEC
1206 SERIES-ICA-1
SECTION 3
Inspection/Test Requirements
3.1
General
This section covers the basic maintenance and service requirements necessary for safe
operation and continued airworthiness of the Model 1206 and 1407 Engine Filter Systems.
The service and inspection intervals designated herein are the maximum allowable and
should not be exceeded.
3.2
Service Intervals
When severe or unusual environmental conditions exist or as flight requirements
dictate, it is the responsibility of the operator to increase the frequency and scope of
inspections necessary to ensure safe operation. Due to the operational nature of a
"barrier" type filter, an important criteria for safe and successful operation is an unobstructed
inlet/filter system. This can be accomplished by visual inspection of the filter through the
inlet fairing prior to each flight. Where as small suspended particles on the outside of the
filter element do not cause an appreciable airflow restriction, large, obvious debris such as
leaves, brush, litter, etc., should be removed prior to flight. Good judgment and practice will
ensure safe operation as well as long filter life.
Inspections, scheduled and conditional, shall be performed by qualified personnel and in
accordance with standard aircraft practice. Compliance with all applicable Service Bulletins
and Airworthiness Directives is mandatory.
Refer to paragraphs 4.3.1 and 4.3.2 for post cleaning inspections.
Service/Inspection/Test Intervals
a
b
Visual inspection of filter element (installed).
Inspect, clean and re-oil filter element.
•
*
•
•
•
* Ref. to 4.3.1 & 4.3.2 for additional cleaning interval information.
c
d
e
f
Inspect and cycle alternate air door.
•
•
•
•
•
Inspect differential pressure switch/ warning annunciator components.
Inspect electrical connections.
Inspect attachment hardware, mounting brackets, and inlet ring
Inspect filter housing structure and associated hardware for cracks
and general security.
•
•
g
h
Leak and pressure test differential pressure switch/annunciator
system.
•
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INTEC
1206 SERIES-ICA-1
SECTION 4
Filter Element Servicing
4.1
General
To insure proper function and maintain a high level of filtration efficiency, great care should
be taken when handling the element. The element is most likely to be damaged during
servicing than in operation. Special care should be taken when removing and reinstalling the
inlet cowling, as well as when removing and replacing the element from the duct. The
pleated material’s fragile wire mesh is easily damaged or deformed when allowed to scrape
against other objects. Careful attention to the following section will assure full service from
the filter element.
4.2
Removal And Reinstallation of Element
a) Remove the inlet cowl per Bell instructions, DO NOT SCRAPE INLET FAIRING ON
FILTER MEDIA.
b) Loosen the sixteen 1/4 - turn fasteners holding the elements in place and carefully remove
them from the duct.
c) Reinstallation is reverse of above.
4.3
Filter Element Cleaning
a) Holding the element clean side up. Gently tap the element to dislodge any large
imbedded debris and dirt.
b) Use only INTEC filter cleaner, PN 40- 15
Severe conditions: Soak element, dirt side down, in a pan of sufficient depth to allow
complete coverage with INTEC filter cleaner. Allow soak for 20 to 60 minutes, depending on
condition. Remove element and shake thoroughly to remove dirty cleaner.
Normal conditions: Spray INTEC filter cleaner liberally onto the entire element for ten
minutes. Alternatively, soak element in a shallow pan of filter cleaner for ten minutes.
DO NOT use Gasoline
DO NOT use Jet A or Kerosene
DO NOT use Caustic Cleaning Solution
DO NOT use Detergents
DO NOT use Parts Cleaning Solvents
DO NOT use Pressure or Steam Cleaners
DO NOT use High Pressure Hose Nozzles
CAUTION: Failure to service the element correctly will harm the filter media by reducing its
filtration efficiency, restricting airflow, and/or a reduction in service life.
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INTEC
1206 SERIES-ICA-1
SECTION 4
Filter Element Servicing (cont.)
c) Rinse the element with low pressure water from a garden hose. Always flush from the
inside to the outside to avoid driving particles further into the filter media.
d) After rinsing, gently shake off the excess water and set filter aside. Allow the element to
dry naturally. It is permissible to set in direct sunlight for drying.
DO NOT use Compressed Air
DO NOT use Open Flame
DO NOT use Hair Dryers or Heat Guns
4.3.1 Inspection - Severe Conditions
In severe environments, it may be necessary to clean and inspect the element more
frequently than recommended in Section 3. An element used in such conditions should be
replaced after not more than 1000 hours of operation. Regardless of the actual time in
service, the physical condition of the element must remain the most important factor to
determine the serviceability of the element.
At each cleaning carefully inspect the elements as follows:
a) Inspect the fine mesh on the forward surface of the element pleats. Complete erosion of
more than .50 in. is cause for element rejection.
b) Inspect the course mesh on the aft surface of the element. Any evidence of mesh wire
wear or general signs of mesh deterioration are cause for element rejection.
c) After cleaning and before reoiling, hold the element up to a light and check for holes in the
element material greater than .020( it is normal to observe pinholes in the filter media
particularly at the pleat folds. These pinholes will not allow the passage of dirt once the
element is oiled). Close the holes if present using a fine pick to reposition the media
material to cover the hole.
d) Check the condition of the element assembly:
- Frames for security
- Seal strips for deterioration and evidence of gaps between the element and duct flange
- Fasteners for security, loose rivets, or worn pins.
- Wash nozzle, tube and valve assembly for security.
Repair any defects as required.
When operating in the most severe conditions it is highly recommended that a serviceable
set of pre oiled elements are available. This will allow continued service while the previously
installed set is being cleaned, inspected and reoiled.
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INTEC
1206 SERIES-ICA-1
SECTION 4
Filter Element Servicing (cont.)
4.3.2 Inspection – Normal conditions.
At each 150 hours of operation or upon activation of the low inlet pressure warning light,
Remove the elements and inspect in accordance with paragraphs 4.3.1a, b, c and d.
Elements should be replaced after 1500 hours in service.
4.4
Oiling The Filter Element
CAUTION: Use only Oil, PN 40 – 10 or PN 40-10CW
AeroFilter oil is a compounded mineral based blend, formulated with special polymers to form
the tack barrier. A dye has been added to show where the oil has been applied. Eventually
the red color will fade but the oil will remain.
CAUTION: Never use the filter element without AeroFilter oil.
DO NOT use Engine Oil
DO NOT use Transmission Oil
DO NOT use Hydraulic Fluid
DO NOT use Lightweight Oils (WD 40, LPS, etc)
a) Fill sprayer with recommended quantity of Aerofilter oil (8 Fluid Ounces).
b) Charge sprayer with compressed air.
c) Apply oil to the filter element with smooth, complete passes parallel to pleats.
d) Repeat 90 degrees to pleats.
e) Use all of the measured quantity of oil.
f) Wait 30 minutes for proper wicking and lightly re-oil any light areas.
NOTE
Do not over-oil the element. Proper absorption is achieved when the filter media is
completely wicked and any surplus oil has been allowed to drip from the element.
The filter element is now ready for installation. Ref. Par. 4.2.
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