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Service Bulletins | Service Letters | Service Information | FAQs

Service Bulletins

Aero Accessories occasionally issues service bulletins to make you aware of issues that may affect your products. To view these service bulletins, you will need Adobe Acrobat Reader or other software capable of displaying a PDF. If you are unable to view these documents online, please call 1-800-822-3200 and request a faxed copy. Service Bulletins are very important. Please download, read, and comply with all applicable Service Bulletins immediately.

  • Service Bulletin SB-001: Fuel Pump Replacement
    8/21/02 [PDF 1.3MB]
    Compliance is required immediately
    Applicability: Any AC/Lycoming (or Ray-Jay/Rotormaster modified) diaphragm type fuel pump overhauled or repaired by Aero Accessories, Inc. included in the following list: Model numbers 40174, 40295, 40296, 40595, 41234, 41270, 41271, 41272, 41452, 41617, 41812, 75246, 75247, LW14282, LW15399, LW15472, LW15473, LW16335, LW16775, LW16947, 103396-01, 103586-01, RJ4033, R00253-2, R00253-501, R00253-502. Serial numbers 91K 073 through 91K 125. All serial numbers beginning with prefixes 91L, 92A, 92B, 92C, 92D, 92E, 92F, 92G, and 92H 001 through 92H 146.

  • Service Bulletin SB-002: High Pressure Fuel Pump Replacement
    2/25/93 [PDF 1.3MB]
    Compliance is required immediately
    Applicability: All High Pressure AC/Lycoming diaphram type fuel pumps serviced or overhauled by Aero Accessories, Inc. beginning June 18, 1991 through November 24, 1992, installed on either certified or experiemntal category aircraft, included in the following list:
    Model 41234 Mfg: AC Serial #: 91F006-92E050
    Model 41234 Mfg: AC Serial #: 92E052-92K058
    Model 40296 Mfg: AC Serial #: 92B002-92I155
    Model 41812 Mfg: AC Serial #: 91L142
    Model LW15473 Mfg: Lycoming Serial #: 91K049-92I151
    Model ROO253-501 Mfg: Ray-Jay Serial #: 92D136-92J016
    Model ROO253-502 Mfg: Ray-Jay Serial #: 92D120-92H075
    Model 103586 Mfg: Ray-Jay Serial #: 92J024

  • Service Bulletin SB-003: Vacuum Pump Replacement
    9/15/05 [PDF 1.1MB]
    MANDATORY service bulletin - compliance is required immediately
    Applicability: New vacuum pumps manufactured by Aero Accessories, Inc. model number AA33216CW (new pumps), serial numbers N31670 through N34175 inclusive (except serial number N33994); and Airborne pumps model 216CW overhauled by Aero Accessories, Inc. with sierial numbers 36735 through 40087 inclusive (except for serial numbers 34865, 38506, 38510, 38512, 38513, 38514, 38516, 38517, 39509, 39965 through 39972, and 40003 through 40020). These pumps were manufactured between March 1, 2005 and August 11, 2005.

  • Service Bulletin SB-004: Marvel-Schebler® Aircraft Carburetors
    2011/10/03 [PDF 176K]
    Applicability: Applies to Marvel-Schebler® aircraft carburetors produced under Aero Accessories, Inc’s FAA-PMA authorization.

  • Service Bulletin SB-006: Remote Oil Filter
    2011/12/14 [PDF 295K]
    Subject: Cautions regarding externally mounted oil filter installations

  • Service Bulletin SB-007: Vacuum Manifold Inspection Procedure
    2012/06/01 [PDF 314K]
    Applicability: Aero Accessories vacuum manifold models AA1H5-25, AA1H5-25A, & AP8-100-20

  • Service Bulletin SB-008: Rear Port Wear Indicator Instructions
    2012/06/01 [PDF 245K]
    Applicability: AA215CC, AA215CC-9, AA216CW, AA3215CC, AA3215CC-9, A3216C2, AA3225CC, AA3225CC-9, AA3226CW & AA3226-45CW

  • Service Bulletin SB-009: Possible Loose Contact Button
    2014/03/10 [PDF 233K]
    Applicability: Contact Assembly A-13081

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Service Letters

Aero Accessories has prepared a set of Service Letters to help you maintain your products. Service Letters require Adobe Acrobat Reader™.

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Service Information

Aero Accessories has prepared a set of Service Information sheets to help you maintain your products. Service Instructions require Adobe Acrobat Reader™.

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FAQs - Our Do-It-Yourself Customer Service Center

Try our "Do-It-Yourself" Customer Service Center below to answer your questions about Aero Accessories, Inc. and our products. If you can't find the answer to your questions here, call us at 1-800-822-3200, Mon.-Fri., 8am-5pm Eastern Standard time, or e-mail us at info@aeroaccessories.com.

Questions about Dry Air Pumps

Questions about Fuel Pumps


Answers to questions about Dry Air Pumps

Q: Which Dry Air Pump is correct for installation on my aircraft?
A: Please refer to the application charts on the Dry Air Pumps pages to find the correct pump for your aircraft. If you or your mechanic will supply us with the aircraft make, model and engine type, we will be happy to provide you with the applicable pump for your aircraft (call 1-800-822-3200 or e-mail pumps@aeroaccessories.com).
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Q: Is an overhauled Dry Air Pump as good as a new pump?
A: We can only speak for our own overhauled pumps since we have no control over the quality of other overhaul shops. Before Aero Accessories, Inc. offered an overhauled pump, we spent more than a year in research and testing to determine what was required to produce a quality overhauled pump which would last as long as a new pump producing the vacuum or pressure required for aircraft application. In 1984 Aero Accessories, Inc. had its overhaul process specification approved by the FAA and began offering quality overhauled vacuum pumps to general aviation. We take great pride in our state of the art overhaul facility, and produce the best overhauled pump on the market today. Over the years we have acquired FAA-PMA's for all component parts of the Dry Air Pumps, and have supplied replacement parts to all overhaulers world wide.
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Q: When I start my engine the vacuum gauge reads zero vacuum, but as the engine RPM increases, the gauge will indicate vacuum. What causes this?
A:
The carbon vanes inside the pump are sticking in rotor slots. Oil or solvent has entered the pump either from a bad oil seal in the engine case at the pump mounting area, or from pressure washing the engine with an oil-based solvent (spraying directly on the pump). The oil or solvent will work its way up into the pump through the drive end, mixing with graphite dust and turning into a paste like material.

A Dry Air Pump is just that: DRY. As the carbon rotor and vanes wear, they produce graphite dust which lubricates moving internal parts of the pump. When oil or solvent mixes with this graphite dust, it keeps vanes from moving freely in their slots and they stick. At low engine RPM, the vanes are recessed in their slots and create no vacuum, but as engine RPM increases, centrifugal force slings the vanes out, allowing them to grab air and create vacuum. Once a pump has become contaminated, its life expectancy is extremely short. The cause of pump contamination should be determined and corrected and the pump should be replaced as soon as possible.
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Q: What procedures should be taken when replacing a failed pump?
A: 
(1) A correctly functioning pump creates a vacuum in the system lines, so when the pump fails (due to wear or from FOD which has entered pump) the carbon rotor and vanes break into very fine pieces which can be sucked back up into the inlet hose. It is very important to remove the inlet and outlet hoses from the aircraft and clean them out thoroughly, making sure to remove all particles. It is imperative to clean the entire system after a pump failure. By doing so you will eliminate the chance of premature failure by your new replacement pump as a result of carbon FOD from a previously failed pump entering your new system.

(2) After you have installed the new replacement pump, check and make sure the aircraft vacuum system is working properly. A faulty regulator , dirty vacuum pump filter, or a crimped or partially collapsed hose which causes a restriction in the system can force to pump to work harder, causing premature failure.

(3) If your aircraft engine is high time, go ahead and replace the oil seal in engine case where the pump mounts. The area could be dry now, but the seal could start leaking in just a few hours causing oil contaminati on in your vacuum pump, making it inoperable. Less than $10 dollars spent here could save you hundreds of dollars later.
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Q: I frequently need to replace my Dry Air Pump. What could be causing this?
A:
1. Check your hoses to make certain that they are not collapsed or kinked.
2. Replace the system filter(s). A dirty or clogged filter will cause the pump to work significantly harder than normal and could cause premature failure.
3. Make sure that you have the correct pump installed on your aircraft.
4. Make sure that no oil contamination is entering the pump.
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Answers to questions about Fuel Pumps

Q: Which Fuel Pump is correct for installation on my aircraft?
A:
Please refer to the application charts on the Fuel Pumps pages to find the correct pump for your aircraft. If you or your mechanic will supply us with the aircraft make, model and engine type, we will be happy to provide you with the applicable pump for your aircraft (call 1-800-822-3200 or e-mail pumps@aeroaccessories.com).
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Q: I have just installed my new Fuel Pump and my engine will not start. Why?
A:
A common cause for this problem is fuel starvation due to improper installation of the fuel pump. Make sure that the fuel lines are not crossed; that is, the inlet line should be connected to the inlet side of the pump (marked "IN" on the top of the port) and the outlet line should be attached to the fuel pump outlet port. Fuel should be present at the inlet side of the fuel pump.

Improper installation of the fuel pump may result in a misalignment of the operating lever with the operating plunger in the accessory case. If so, there will be no movement of the lever and no pumping motin to profide fuel flow. If misalignment is found upon removal of the pump, the lever is probably damaged or broken. If misalignment of the operating lever has occurred, it will require inspection and repair by a qualified technician. If you would like to have Aero Accessories, Inc. perform repairs on a broken or misaligned lever, please contact us at 1-800-822-3200, Mon.-Fri., 8am-5pm Eastern Standard time, or e-mail us at repairs@aeroaccessories.com
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Q: What is causing the fuel (or oil) to leak from my Fuel Pump drain line?
A:
Leakage of fuel or oil through the fuel pump overboard drian line indicates a worn or ruptured diaphragm inside the fuel pump. The fuel pump should be replaced before further flight.
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Q: What is causing my fuel pressure to fall below the "green arc"?
A:
The most common reasons for low fuel flow/pressure are the following:
1. A worn or broken O-ring on the inlet side fuel fitting can cause an inlet suction leak. An inlet air leak will result in low Fuel Pump output pressure.
2. A weak operating spring in the Fuel Pump diaphragm assemply;
3. A worn fuel pressure gauge;
4. A clogged fuel vent or fuel cap;
5. A constriction in a fuel line either externally (a kinked hose), or internally (due to a collapsed hose lining).
6. Wrong fuel pump for the installation.
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Q: What is causing my fuel pressure to fluctuate?
A:
Fluctuating fuel pressure can be the result of the following:
1. A worn fuel pressure gauge;
2. A worn or broken O-ring on the inlet side fuel fitting;
3. A defective fuel selector valve (boost pump may labor);
4. An obstruction in the induction system (air intake);
5. A clogged or dirty fuel strainer;
6. Foreign material inside the fuel body (such as fuel cell sealant, thread sealant, or a drill shaving).
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Our Customer Service Technicians look forward to assisting you with your Fuel Pump or Fuel System inquiries. Call us today at 1-800-822-3200 or e-mail us at info@aeroaccessories.com-- we will be glad to help




"Our Customer Service Technicians look forward to assisting you with your Fuel Pump or Fuel System inquiries. Call us today at 1-800-822-3200 or e-mail us -- we will be glad to help"

Toll Free:
1-(800)-822-3200
Phone: 1-(336)-449-5054
Fax: 1-(336)-449-5461

 

 

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Aero Accessories logo. Aero Accessories, Inc.
1240 Springwood Avenue
Gibsonville, NC 27249
USA
Toll Free: 1-(800)-822-3200
Phone: 1-(336)-449-5054
Fax: 1-(336)-449-5461

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