AD 91-14-15
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Diamond Aircraft Industries GmbH | H-36 DIMONA | Airworthiness Directives; HOFFMANN AIRCRAFT, LTD. Model H-36 Dimona Motor Gliders |
Unsafe Condition
Engine shutdown caused by solid or rubber-like gelcoat fuel deposits in GFRP or FRP fuel tanks.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace GFRP/FRP fuel tank with aluminum tank Part Number 820.5.12 S3a, clean fuel filter and lines, adjust weight and balance data, update maintenance checklist. If aluminum tank unavailable, perform interim inspections every 100 hours TIS or 12 months: ground glider, empty/inspect tank, clean filters, check for deposits/soft spots.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 50 hours time-in-service (TIS) or 6 calendar months after the effective date, whichever occurs first. Interim actions must be done every 100 hours TIS or 12 calendar months if aluminum tank not available.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
HOFFMANN AIRCRAFT, LTD. Model H-36 Dimona motor gliders with serial numbers 3501 through 36143 equipped with GFRP/FRP fuel tanks.
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.