AD 72-13-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | FH1100 Manufacturing Corporation | 1100 | Airworthiness Directives; Fairchild Hiller Models 1100 and FH 1100 Helicopters |
| aircraft | FH1100 Manufacturing Corporation | FH-1100 | Airworthiness Directives; Fairchild Hiller Models 1100 and FH 1100 Helicopters |
Unsafe Condition
The engine-to-transmission drive shaft assemblies (P/N 19E49-3A, -3B, -3C) may have diaphragm end packs exceeding service limits, leading to potential failure of the drive shaft assembly.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace drive shaft assemblies with P/N 19E49-3C (if diaphragm end packs have less than 350 hours) or P/N 19E49-3E. Inspect alignment and axial end play every 50 hours in service (extendable to 100 hours with P/N 19E49-3E), and after hard landings or component removal/replacement. Replace components and check rigging if limits are exceeded.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within 15 hours in service
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Fairchild-Hiller Models 1100 and FH-1100 helicopters incorporating P/N 19E49-3A, -3B, or -3C engine-to-transmission drive shaft assemblies.
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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