AD 70-04-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | McCauley Propeller Systems | 2D34C | MCCAULEY PROPELLERS Models 2D36C14-(X)/78KM, 2D34C53-(X)/74E, and B2D34C53-(X)/74E Propellers |
| aircraft | McCauley Propeller Systems | 2D36C14 | MCCAULEY PROPELLERS Models 2D36C14-(X)/78KM, 2D34C53-(X)/74E, and B2D34C53-(X)/74E Propellers |
| aircraft | McCauley Propeller Systems | B2D34C | MCCAULEY PROPELLERS Models 2D36C14-(X)/78KM, 2D34C53-(X)/74E, and B2D34C53-(X)/74E Propellers |
Unsafe Condition
Propeller mid-blade and tip failures due to foreign object damage or cracks.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Visually inspect blades for foreign object damage or cracks. Replace any cracked blades before further flight with a new blade inspected and repaired as necessary. Install a placard near the tachometer advising to avoid continuous operation between 2250 and 2550 r.p.m. with manifold pressure below 15 inches mercury.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 25 hours time in service after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
McCauley Propeller Systems models 2D36C14-(X)/78KM, 2D34C53-(X)/74E, and B2D34C53-(X)/74E propellers on Lycoming O-360 type engines.
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
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.