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Frequently Asked Questions
If one aircraft magneto fails do I have to service both magnetos?
It is not required to service both aircraft magnetos at the same time but it is a good idea to keep the pair of magnetos on the same maintenance schedule to avoid additional down time in the future.
Is the aircraft magneto connected to the rest of the electrical system?
No, the aircraft magneto ignition system is self-contained and independent from the aircraft electrical system. In the event of an electrical failure, the mechanical aircraft magneto will continue to provide spark to the engine.
What is the difference between a pressurized and non-pressurized aircraft magneto?
Pressurized aircraft magnetos are usually found in turbocharged engines. Air is diverted from the turbocharging system and sent through a line to a fitting installed in the aircraft magneto. The aircraft magneto is also fitted with an opening at the bottom of the housing to allow a small air leak. This opening insures a constant flow of air through the aircraft magneto to avoid the internal air from becoming ionized.
What powers an aircraft magneto?
The aircraft magneto is a self-contained generator that consists of a magnet spinning in close proximity to a high-output coil. As the magnet spins, it creates a magnetic field. Fluctuations in that field create an electrical current. Eventually, the current generated by magnetic flux undergoes a voltage spike that is strong enough to fire a spark plug.
Why are there two aircraft magnetos?
The dual arrangement of aircraft magnetos produces a smoother and more complete combustion of the fuel mixture. It also provides for ignition redundancy, so that the engine will continue to run in the event that one magneto malfunctions.
Why do aircraft need magnetos?
In aircraft engines, it is important to maintain an ignition system independent of the eletrical system, so that the engine will continue to run in the event of alternator or battery malfunction. Additionally, aircraft magnetos provide a compact and reliable means for igniting the spark plugs.
Does the BMC kit come with the piston?
No, BMC kits do not caintain the piston. However, it comes with the hardware needed to complete the job and installaiton tooling.
How do I know if the BMC kit will fit my aircraft?
It is critical the owner or maintenance shop obtain a PN off the brake master cylinder assembly, not from the IPC manual.
How do Marsh Brothers' kits differ from the OEM parts they replace?
The kits fit exactly the same space that the OEM parts do. However, the most important difference is that the parts in the kits cannot corrode or seize together because of the self lubricating polymer bushings used to replace the steel bushings. If the steel OEM parts corrode and seize, the result is costly repairs to the supporting structure in the wing.
How does the Marsh Brothers roller address the issue of damage to the sides of the tracks?
Instead of Teflon, Marsh Brothers’ rollers employ an AeroTough® GF thrust washer between the roller flange and track sidewall. AeroTough® GF is tougher than Teflon and will not herniate, crack and dislodge under load.
How does the Marsh Brothers roller simplify the installation?
Marsh Brothers’ roller is a flanged roller design, meaning that there is no separate phenolic and steel washer. Additionally, instead of a Teflon washer, Marsh Brothers’ design incorporates an AeroTough® GF washer that is an integral part of the roller. This results in a single roller bearing to be installed with the standard bolt, nut and washer hardware versus many parts included in the OEM roller.
How easy are the kits to install?
It's just a matter of removing the doors, pressing out the steel bushings and then pressing in the replacement parts. The kits include all necessary hardware including new bolts and spacers. Where the OEM sleeve part is flanged, the space is made up with a thin washer. Installation videos are available to demonstrate kit installation.
How should I clean the Marsh Brothers flap rollers?
The rollers are highly resistant to incursion by debris, dust, and other particles. Should the ingestion of various particles become an issue, the aircraft operator can use the same cleaners, detergents, and solvents approved by the aircraft manufacturer. Marsh Brothers have performed compatibility tests with no detriment of the roller’s integrity.
What are the benefits associated with Marsh Brothers' product?
Longer life-time, grease-free operation, does not support corrosion, decrease in weight, self lubricates.
What if I lubricate the polymer bushings?
You don't need to, but it's not a problem if someone doesn't know the bushings have been fitted and decides to put lubrication into the hinges. The bushings will function properly in oil or grease, but it is not necessary.
What is the benefit of the spinner washers?
Typical spinner washers are made from thin nylon and require frequent replacement. Nylon washers fail under the pressure exerted by the screw's head. MBA spinner washer solves this problem by conforming the the curvature of the spinner, and its extra thickness has a vibration dampening effect.
What is the issue with the OEM flap roller?
It is a traditional sealed grease packed needle roller bearing that relies on supplemental lubrication. Over time the grease dries out resulting in a degradation in the rollers performance.
What is the polymer used in the kits?
Marsh Brothers developed a new poylmer formula specifically for aerospace which they call AeroTough™ GF, for "grease free". Lubricant is bult into the polymer, completely eliminating any need for periodic lubrication.
What makes the Marsh Brothers roller better than the OEM?
Marsh Brothers’ self-lubricating roller has no metal rolling element. Instead, it utilizes a proprietary self-lubricating polymer called AeroTough® GF. Since AeroTough® GF does not rely on supplemental lubrication, it will never dry out and degrade.
Which fuel cap washer will fit my fuel cap?
We have three types of fuel cap washers. In order to know the correct washer, the fuel cap part number must be known. It can usually be found at the bottom of the fuel cap assembly.
Why choose McFarlane?
OUR PARTS ARE ENGINEERED TO LAST LONGER WHILE SOLVING KNOWN SAFETY ISSUES
OVER 40,000 PARTS IN STOCK WITH SAME DAY SHIPPING IF ORDERED BY 3PM
OUR TEAM PROVIDES THE OLD-FASHIONED CUSTOMER SERVICE THAT YOU EXPECT
