AOPA Pilot Magazine - February 2021 - 97

The Bendix D2000/D3000 dual magneto is used on many Lycoming engines. If
your Lycoming engine model number ends
in a " D " suffix-e.g., O-360-A1F6D or TIO540-F2BD-it has one of these puppies
installed. It's two independent magnetos packaged into one box, with a single
drive shaft, mounted on a single pad on
the accessory case. The idea was to reduce
the real estate and gear train complexity
at the back of the engine. This probably
wasn't Lycoming engineering's best idea.
I've been struck by how many aircraft owners and mechanics have bad experiences
with these dual mags, some declaring that
they would not fly any single-engine airplane that was dual-mag equipped.
The original D2000 dual mag was
horribly unreliable, and most of them
have long since been replaced with the
improved D3000. Although the D3000 has
pretty much dual everything-dual breaker
points, coils, distributors, and distributor
gears-it still doesn't provide the level of
redundancy of two conventional magnetos.
One problem area has been the holddown clamps that attach the mag to the
engine. They have a history of coming loose-either because they were not
properly torqued or because the magneto
mounting flange or engine mounting pad
was worn. When the clamps come loose,
the dual mag can shift and that screws
up the timing of both magnetos (not just
one). Another single-point failure is the
impulse coupling that drives the dual
mag from the engine gear train. A dualmag-equipped Lycoming engine has only
one of these, rather than two. An impulse
coupling failure can take out the entire
ignition system.
Although the dual magneto complies
with the letter of the FAA's two-source
requirement, I can't help but wonder
whether it meets the spirit of the regulation. It just doesn't provide the same level
of redundancy as two conventional mags.
As if this wasn't bad enough, the dual
mag is used only on Lycomings but was
manufactured by Continental. In 2010,
Continental discontinued manufacture and
support of the dual mag, leaving owners of
" -D " Lycomings in something of a pickle
aopa.org/pilot AOPA PILOT | 97

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AOPA Pilot Magazine - February 2021

Table of Contents for the Digital Edition of AOPA Pilot Magazine - February 2021

Contents
AOPA Pilot Magazine - February 2021 - Intro
AOPA Pilot Magazine - February 2021 - Cover1
AOPA Pilot Magazine - February 2021 - Cover2
AOPA Pilot Magazine - February 2021 - Contents
AOPA Pilot Magazine - February 2021 - 2
AOPA Pilot Magazine - February 2021 - 3
AOPA Pilot Magazine - February 2021 - 4
AOPA Pilot Magazine - February 2021 - 5
AOPA Pilot Magazine - February 2021 - 6
AOPA Pilot Magazine - February 2021 - 7
AOPA Pilot Magazine - February 2021 - 8
AOPA Pilot Magazine - February 2021 - 9
AOPA Pilot Magazine - February 2021 - 10
AOPA Pilot Magazine - February 2021 - 11
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AOPA Pilot Magazine - February 2021 - 14
AOPA Pilot Magazine - February 2021 - 15
AOPA Pilot Magazine - February 2021 - 16
AOPA Pilot Magazine - February 2021 - 17
AOPA Pilot Magazine - February 2021 - 18
AOPA Pilot Magazine - February 2021 - 19
AOPA Pilot Magazine - February 2021 - 20
AOPA Pilot Magazine - February 2021 - 21
AOPA Pilot Magazine - February 2021 - 22
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AOPA Pilot Magazine - February 2021 - 24
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AOPA Pilot Magazine - February 2021 - 26
AOPA Pilot Magazine - February 2021 - 27
AOPA Pilot Magazine - February 2021 - 28
AOPA Pilot Magazine - February 2021 - 29
AOPA Pilot Magazine - February 2021 - 30
AOPA Pilot Magazine - February 2021 - 31
AOPA Pilot Magazine - February 2021 - 32
AOPA Pilot Magazine - February 2021 - 33
AOPA Pilot Magazine - February 2021 - 34
AOPA Pilot Magazine - February 2021 - 35
AOPA Pilot Magazine - February 2021 - 36
AOPA Pilot Magazine - February 2021 - 37
AOPA Pilot Magazine - February 2021 - 38
AOPA Pilot Magazine - February 2021 - 39
AOPA Pilot Magazine - February 2021 - 40
AOPA Pilot Magazine - February 2021 - 41
AOPA Pilot Magazine - February 2021 - 42
AOPA Pilot Magazine - February 2021 - 43
AOPA Pilot Magazine - February 2021 - 44
AOPA Pilot Magazine - February 2021 - 45
AOPA Pilot Magazine - February 2021 - 46
AOPA Pilot Magazine - February 2021 - 47
AOPA Pilot Magazine - February 2021 - 48
AOPA Pilot Magazine - February 2021 - 49
AOPA Pilot Magazine - February 2021 - 50
AOPA Pilot Magazine - February 2021 - 51
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AOPA Pilot Magazine - February 2021 - 53
AOPA Pilot Magazine - February 2021 - 54
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AOPA Pilot Magazine - February 2021 - 63
AOPA Pilot Magazine - February 2021 - 64
AOPA Pilot Magazine - February 2021 - 65
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AOPA Pilot Magazine - February 2021 - 67
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AOPA Pilot Magazine - February 2021 - 71
AOPA Pilot Magazine - February 2021 - 72
AOPA Pilot Magazine - February 2021 - 73
AOPA Pilot Magazine - February 2021 - 74
AOPA Pilot Magazine - February 2021 - 75
AOPA Pilot Magazine - February 2021 - 76
AOPA Pilot Magazine - February 2021 - 77
AOPA Pilot Magazine - February 2021 - 78
AOPA Pilot Magazine - February 2021 - 79
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AOPA Pilot Magazine - February 2021 - 88
AOPA Pilot Magazine - February 2021 - 89
AOPA Pilot Magazine - February 2021 - 90
AOPA Pilot Magazine - February 2021 - 91
AOPA Pilot Magazine - February 2021 - 92
AOPA Pilot Magazine - February 2021 - 93
AOPA Pilot Magazine - February 2021 - 94
AOPA Pilot Magazine - February 2021 - 95
AOPA Pilot Magazine - February 2021 - 96
AOPA Pilot Magazine - February 2021 - 97
AOPA Pilot Magazine - February 2021 - 98
AOPA Pilot Magazine - February 2021 - 99
AOPA Pilot Magazine - February 2021 - 100
AOPA Pilot Magazine - February 2021 - 101
AOPA Pilot Magazine - February 2021 - 102
AOPA Pilot Magazine - February 2021 - 103
AOPA Pilot Magazine - February 2021 - 104
AOPA Pilot Magazine - February 2021 - 105
AOPA Pilot Magazine - February 2021 - 106
AOPA Pilot Magazine - February 2021 - 107
AOPA Pilot Magazine - February 2021 - 108
AOPA Pilot Magazine - February 2021 - 109
AOPA Pilot Magazine - February 2021 - 110
AOPA Pilot Magazine - February 2021 - 111
AOPA Pilot Magazine - February 2021 - 112
AOPA Pilot Magazine - February 2021 - Cover3
AOPA Pilot Magazine - February 2021 - Cover4
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