AD 77-16-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | McCauley Propeller Systems | 2A34C | MCCAULEY PROPELLERS Models |
| engine | McCauley Propeller Systems | 2A36C1 | MCCAULEY PROPELLERS Models |
| engine | McCauley Propeller Systems | 2A36C18 | MCCAULEY PROPELLERS Models |
| engine | McCauley Propeller Systems | 2A36C23 | MCCAULEY PROPELLERS Models |
| engine | McCauley Propeller Systems | 2A36C29 | MCCAULEY PROPELLERS Models |
| engine | McCauley Propeller Systems | 2D34C | MCCAULEY PROPELLERS Models |
| engine | McCauley Propeller Systems | 2D36C14 | MCCAULEY PROPELLERS Models |
| engine | McCauley Propeller Systems | D2A34C | MCCAULEY PROPELLERS Models |
| engine | McCauley Propeller Systems | D2A36C33 | MCCAULEY PROPELLERS Models |
| engine | McCauley Propeller Systems | E2A34C | MCCAULEY PROPELLERS Models |
Unsafe Condition
Blade actuating pin failures resulting from using an incorrect actuating pin or improper rework of the ferrules and installation of the blade actuating pins and washers, including stripped threads on the ends of the actuating pin due to a blind actuating pin hole not tapped to the proper depth, which may prevent the actuating pin from seating on the washers.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Disassemble the propeller and inspect blade actuating pins, washers, and ferrules for proper conformity and installation per McCauley Service Manual No. 720415. Repair or replace improperly installed components and reassemble the propeller as required. Report inspection results to the FAA.
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Compliance Time
Within 25 hours time in service after the effective date for Hoosier-modified propellers; within 1200 hours time in service since last Univair rework or two years, whichever comes first, after the effective date for Univair-modified propellers.
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Affected Aircraft
McCauley Propeller Systems models 2A34C, 2A36C1, 2A36C18, 2A36C23, 2A36C29, 2D34C, 2D36C14, D2A34C, D2A36C33, E2A34C, F2A34C. Affected by modification by Hoosier Aircraft Accessory Inc. or Univair Aircraft Corporation between December 8, 1972, and June 30, 1975, with specific hub serial numbers listed in the AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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