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www.bonanza.org<br />

Cylinder Failure<br />

By Tom Rosen, Chairman, ABS Technical Committee<br />

The photos are of my #4 cylinder, an investment cast Millennium,<br />

that failed 50 hours after overhaul. If you look closely, you can<br />

see that the crack extends well to the left of the valve seat.<br />

The interesting part, and<br />

the reason I am sharing this<br />

with ABS members, is that I<br />

discovered the crack while<br />

complying with the Superior/<br />

Millennium Airworthiness<br />

Direc tive. The compression<br />

was 67/80, compared to the<br />

low 70s <strong>for</strong> the other five.<br />

GA News<br />

Fuel Pump<br />

Replacement<br />

C J Aviation in Miami, Florida<br />

(305-378-1469) now has a PMA<br />

replacement electric boost pump<br />

to replace the Dukes pump in<br />

Bonanzas and Barons. The price<br />

is comparable <strong>for</strong> overhaul and<br />

only slightly higher <strong>for</strong> a new<br />

pump. They will take the old<br />

Dukes pump as an exchange <strong>for</strong><br />

the new PMA pump.<br />

Not remarkable at all. Visual<br />

inspection of the cylinder<br />

was normal. I never would<br />

have found the crack if my<br />

air compressor had been<br />

running, because I would<br />

not have heard the sound<br />

of air escaping through<br />

the crack. The soapy water<br />

test confirmed the leak on the left side of the head, way down against the<br />

#6 cylinder. There was almost no visible evidence of combustion products on<br />

the exterior of the cylinder head with the cylinder installed.<br />

As a result of this, I now always accomplish compression checks with the<br />

compressor turned off while I am taking the readings in a quiet hangar.<br />

Bonanza, Travel Air, Baron<br />

SHOULDER HARNESS<br />

KITS<br />

FAA STC/PMA APPROVED KITS<br />

• Factory style, 3 point diagonal design<br />

• Factory quality, Tso-c114 Amsafe belt systems<br />

• Choice of stock colors or special order<br />

• Matching rear lap belts available<br />

FIXED RESTRAINT INERTIAL REEL EQUIPPED<br />

Low Cost<br />

Af<strong>for</strong>dable<br />

$799.00 Complete $1,099.00 Complete<br />

AIRCRAFT JACKS – THAT FIT<br />

• Three Leg Design<br />

• Rugged Construction<br />

• #6000 Capacity Ram<br />

• Range 24" - 41"<br />

• Locking Safety Collar<br />

• No Stamped Parts<br />

MODEL 324 $229.00 EA.<br />

Online at www.alphaaviation.com<br />

Alpha Aviation Inc.<br />

1505 Chateaulin Lane • Burnsville, Minnesota 55337<br />

1-800-653-5112 1-952-856-5158 (fax)<br />

Volume 13 • Number 1 AMERICAN BONANZA SOCIETY 71

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