AD 61-03-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Hartzell Propeller, Inc. | HC-93Z30-2 | HARTZELL Models HC-93Z30-2D and HC-B3Z30-2D Propellers |
| aircraft | Hartzell Propeller, Inc. | HC-B3Z30-2 | HARTZELL Models HC-93Z30-2D and HC-B3Z30-2D Propellers |
Unsafe Condition
Failure or cracking of B-1803 cylinders in the threaded area, resulting in loss of engine oil and control of the propeller.
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Required Actions
Check for oil leaks in the propeller hub every 25 hours' time in service until replacement is done. Replace cylinder B-1803 and collar 834-7 with B-1803-1 and 834-7A at next propeller overhaul or within 400 hours' time in service, whichever comes first. Restamp hub model dash number to -2E.
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Compliance Time
Within the next 25 hours' time in service and every 25 hours' time in service thereafter until replacement is accomplished. Replacement must be done at the next propeller overhaul or within the next 400 hours' time in service, whichever occurs first.
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Affected Aircraft
Hartzell Propeller, Inc. models HC-93Z30-2D and HC-B3Z30-2D propellers installed on Pratt and Whitney R-985 engines, found in aircraft such as Beech 18 Series, Grumman G-21A, and Lockheed 12A.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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