AD 81-16-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Dowty Propellers | (c) R175/4-30-4/ | DOWTY ROTOL LTD. Models R175/4-30-4/13E Propellers |
Unsafe Condition
Propeller failure due to cracking of the propeller hub front wall to snout radius.
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Required Actions
Inspect propeller hubs in accordance with Dowty Rotol Service Bulletin No. 61-909, Part 2A or equivalent, during overhaul or disassembly. If cracks are found, replace the hub. For propellers between overhauls, remove, disassemble, inspect, reassemble, and reinstall per Service Bulletin 61-909 Part 2B or equivalent. Reinspections are required at intervals not exceeding 2,000 operating hours if a cracked hub is found in the fleet.
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Compliance Time
Compliance is required prior to accumulating specific operating hours as outlined: for hubs with <20,000 total hours, inspect at next overhaul or before 22,000 total hours; for hubs with ≥20,000 hours, inspect based on hours since last inspection/overhaul (either 600 or 2,000 additional hours).
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Affected Aircraft
Dowty Rotol propellers Type R175/4-30-4/13E with hub and driving assembly, P/Ns 601022104 or 601022420 not modified by Service Bulletin 61-604, installed on Fairchild F-27, F-27B, and Fokker F-27 Mks 100, 300, and 700 airplanes.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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