Aerotech

The CV1J4 “Clear View Filter isFAA approved on a“ Change Only As Needed”Basis.

A very important second reason for the “Clear View” Filter development was the need for monitoring air pump deterioration in an effort to reduce or eliminate air pump failures during instrument flight conditions.

It is a well-known fact that the two most common reasons for air pump failure is old age and high system pressure (sometimes called “pump, back pressure”).

As an air pump accumulates operating hours, increased internal wear of the pump bore, along with the carbon rotor and vanes will occur. As the wear on these components increases the carbon dust discharged from the air pump also increases. If this warning sign is not noticed, or is ignored, air pump failure will occur be it on the flight line or at 10,000 feet.

The pressure produced by the air pump to provide adequate gyro instrument and/or aircraft de-icing operation is not normally monitored by a pressure gage in the instrument panel. With the system regulator maintaining the OEM recommended 4.7 to 5.2” hg (2.35 to 2.6 psi) any malfunction in the system that would cause an overload on the air pump will never be noticed. More pressure on the pump equals more internal wear, equals more carbon dust discharge.

With the CV1J4 “Clear View” Inline Filter installedany increase in carbon dust being exhausted from the air pumpis clearly visible at every pre-flight or post-flight inspection.

The CV1J4 “Clear View” Filter is provided with a visual scale for comparison of internal contamination. When installed in a properly operating system the CV1J4 filter will last the life of the air pump and in fact is;

“Guaranteed For The Life Of The Air Pump”.

FAA-PMA Approved For Installation On The Following Aircraft

Beechcraft:

Single Engine	Twin Engine
F33, F33A, F33C, G33,V35B, 36, A36, A36TC, and B36TC	95-B55, D55, E55, 56TC,A56TC, 58, 58P, 58TC, B60, A65, 70, 76 and 65-B80

Gulfstream:GA-7 Mooney:M20J, M20K and M20M Piper:PA-31, PA-31P, PA-31-300, PA-31-325, PA-31-350, PA-31P-350, PA-31T2, and PA-34-200T Twin Commander :700

Standard equipment on all Mooney Aircraft since 1995:

Model M20M (Bravo) Model M20R (Ovation) Model M20S (Eagle)

While the original intent of the CV1J4 “Clear View” Inline filter was to replace the old style metal can 1J4-6 and 1J4-7 filters in pressure pneumatic systems, new applications appeared right around the corner. It was known for some time that air pump failure in a “vacuum” instrument gyro system would eventually cause the failure or inaccurate operation of the aircraft’s gyro instruments. The many instrument repair stations throughout the country that overhaul or replace gyro instruments contaminated with carbon dust can support this as a certainty. During flight, positive pressure is created in the engine compartment via the ram air entering the front cowl. Normal operation of the air pump creates a constant vacuum in the system lines in each gyro instrument. With constant rotation of the pump rotor any carbon dust produced from normal (or abnormal) wear is exhausted into the engine compartment. Air Flow During Normal Operation

When pump failure occurs during engine operation the pump coupling separates to prevent damage to the internal parts of your engine. Just prior to the rotor binding and coupling separation however, it is not uncommon for the rotor and vanes to fragment into small pieces creating large amounts of carbon dust. With a vacuum still present in the gyro instruments and connecting lines, along with the positive pressure in the engine compartment, this carbon dust can be moved backward, past the vacuum regulator and into both gyro instruments. (Ref Fig. 2) Air Flow Caused By Air Pump Failure

In the early 90′s, Mooney Aircraft Corporation began installing a filter between the air pump and vacuum regulator to prevent gyro instrument failure caused by carbon contaminationand eliminatehigh replacement costsfor the aircraft owner. Gyro Instrument Protection

Figure 3

The CV1J4 “Clear View Filterhas been provided for gyro instrument protection on all Mooney Aircraft since October, 1995. Air pump failures are expensive, not to mention the time and expense involved with possible gyro instrument replacement down the road. Installation of an inline filter in vacuum gyro systems is a practical idea overlooked (or ignored) by most aircraft manufactures. Gyro protection for Cessna and Piper single engine aircraft has just been made easier with installation of theCV1J4-CandCV1J4-Pkits. For a complete list of aircraft FAA-PMA approved for CV1J4 gyro protection, click on your model aircraft below.

Model	Year	A/C Serial No.
150J	1969	15069309 to 15071128
150K, L, M	1970-1977	15071129 to 15079405
A150K, L, M	1970-1977	A1500001 to A1500734
152	1978-1985	15279046 to 15286033
A152	1978-1985	A1520735 to A1521049
172 I, K, L, M, N, P, Q	1968-1985	17256513 to 17276516
172 R	1996 & on	17280001 & on
172 S	1996 & on	17280001 & on
R172K	1977-1961	R1722000 to R1723454
172RG	1980-1985	172RG0001 to 172RG1191
177, A, B	1968-1978	17700001 to 17702752
177RG	1971-1978	177RG0001 to 177RG1366
182R	1985-1986	18268435 to 18268615
T182	1981-1985	18267716 to 18268541
R182	1983-1986	R18201929 to R18202041
TR182	1983-1986	R18201929 to R18202041

If your aircraft is not listed above, contact Aerotech Components, Inc. for additional information. Each Gyro Protection Kit is provided with clear installation instructions, photos, log book entry data and a copy of FAA STC # SA475CH.

Model	Year	A/C Serial No.
PA-28-140	1964 thru 1977	28-20001 thru 28-7725290
PA-28-150	1961 thru 1967	28-1 thru 28-4377
PA-28-160	1961 thru 1967	28-1 thru 28-4377
PA-28-151	1974 thru 1977	28-7415001 thru 28-7715314
PA-28-161	1977 & up	28-7716001 & up
PA-28-180	1963 thru 1975	28-671 thru 28-7505261
PA-28R-180	1967 thru 1971	28R-30005 thru 28R-7130019
PA-28-181	1976 & up	28-7690001 & up
PA-28R-200	1969 thru 1976	28R-25001 thru 28R7635545
PA-28R-201	1977 thru 1994	28R-7737002 thru 2837061
PA-28R-201T	1977 thru 1990	28R-7703002 thru 2803015
PA-28RT-201	1979 thru 1982	28R-7918001 thru 28R-8218039
PA-28RT-201T	1979 & up	28R-7931001 & up
PA-38-112	1978 thru 1982	38-78A0001 thru 38-82A0122

If your aircraft is not listed above, contact Aerotech Components, Inc. for additional information. Each Gyro Protection Kit is provided with clear installation instructions, photos, log book entry data and a copy of FAA STC # SA559CH.

Mid-Cabin Deice Boot Inflation Test Kit For Gulfstream Astra-G100, G150 & G200