AD 79-16-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aerotek II, Inc. | B-1 | Airworthiness Directives; SL Industries Models B-1 and B-1A Airplanes |
| aircraft | Aerotek II, Inc. | B-1A | Airworthiness Directives; SL Industries Models B-1 and B-1A Airplanes |
Unsafe Condition
Failure of the wing rear spar at the wing-fuselage attachment fitting (P/N 160049) due to cracking.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect both rear wing spars by removing fairings, hoisting wings, jacking landing gear, removing bolts and fittings, and visually/dye penetrant inspecting for cracks and elongation beyond 0.254 inches. Repair discrepancies by replacing damaged spar or repairing corrosion per AC 43.13-1A and MIL standards. Modification via SL Industries SB A-25A removes repetitive inspections.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 50 hours after the effective date of this AD, unless already accomplished within the last 50 hours' time in service and thereafter at intervals not to exceed 100 hours' time in service from the last inspection.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
SL Industries Models B-1 and B-1A Airplanes, all Serial Numbers, certificated in all categories with over 500 hours' time in service.
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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