AD 91-07-18
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | HB Aircraft Industries AG | HB-23 2400 | Airworthiness Directives; HB AIRCRAFT INDUSTRIES AG Models HB-23/2400-SP Scanliner and Hobbyliner Powered Gliders |
Unsafe Condition
Loss of the propeller while in flight that could result in damage to the powered glider and loss of control.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace the three-blade propeller with a fixed-pitch, two-blade propeller in accordance with Ing. HB Instructions 23/2/90, dated December 19, 1990. An alternative method of compliance or adjustment of the compliance time may be approved by the Manager, Brussels Aircraft Certification Office.
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Compliance Time
Required prior to further flight after the effective date of this AD, unless already accomplished.
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Affected Aircraft
HB Aircraft Industries AG Models HB-23/2400-SP Scanliner and Hobbyliner powered gliders (all serial numbers) equipped with a three-blade adjustable propeller.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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