AD 54-12-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Martin-Marietta Corporation | 404 | MARTIN Model 404 Aircraft |
Unsafe Condition
Cracks in the threaded portion of the piston rod (P/N SE 997512) and end bosses of the forked end fitting (P/N SE997590) of main landing gear oleo drag struts (P/N E100008) due to fatigue from service use.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform dye penetrant or Zyglo inspections for cracks on the piston rod threads and forked end fitting bosses every 250 service hours (or 500 hours if specific modifications are made). Replace struts at 8,500 hours total service time with new P/N E100050 assemblies. Scrap any components found cracked during inspections.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Compliance required as indicated.
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Affected Aircraft
Martin-Marietta Corporation Model 404 aircraft with main landing gear oleo drag struts P/N E100008.
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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