AD 81-16-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Dowty Propellers | (c) R.209/4-40-4.5 | DOWTY ROTOL, LTD. Propeller Types |
| aircraft | Dowty Propellers | (c) R.245/4-40-4.5 | DOWTY ROTOL, LTD. Propeller Types |
| aircraft | Dowty Propellers | (c) R.259/4-40-4.5 | DOWTY ROTOL, LTD. Propeller Types |
| aircraft | Dowty Propellers | (c) R179/4-20-4/ | DOWTY ROTOL, LTD. Propeller Types |
| aircraft | Dowty Propellers | (c) R184/4-30-4/ | DOWTY ROTOL, LTD. Propeller Types |
| aircraft | Dowty Propellers | (c) R193/4-30-4/ | DOWTY ROTOL, LTD. Propeller Types |
| aircraft | Dowty Propellers | (c) R257/4-30-4/ | DOWTY ROTOL, LTD. Propeller Types |
Unsafe Condition
Cracks in the propeller pitch lock cylinder
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 1,000 hours time in service after the AD's effective date or at the next propeller overhaul, inspect the pitch lock cylinder for cracks per Service Bulletin 61-906. If cracks are found, remove and replace with a crack-free cylinder before further flight. If no cracks, inspect chamfer dimensions and rework/reprotect if out of tolerance. Inspect lock support sleeves for dimensional compliance, rework if necessary. Spares must be inspected and addressed before release to service.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 1,000 hours time in service after the effective date of this AD, or at the next propeller overhaul, whichever occurs first
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Dowty Propellers models R184/4-30-4/50, R193/4-30-4/50 & 61, R257/4-30-4/60, R209/4-40-4.5/2, R245/4-40-4.5/13, R259/4-40-4.5/17, R179/4-20-4/33 with Mod. No. (c)VP2833 or (c)VP2866 incorporated, excluding serial DRG 67/78 and subsequent, and cylinders with 3/4 inch white paint spot.
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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