AD 73-15-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Dassault Aviation | Fan Jet Falcon | Airworthiness Directives; AVIONS MARCEL DASSAULT Model Fan Jet Falcon Airplanes |
Unsafe Condition
Leakage of very hot air into the rear compartment due to scoring or bending of studs retaining the SEMCA coupling on pipe P/N MY20-721-28-1, stretching or elongation of the holes receiving those studs, or cracks in the weld beads and adjoining areas at the junction of pipes P/N MY20-721-28-1 and MY20-721-61-1.
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Required Actions
Within 100 hours' time in service after the effective date, visually inspect studs and holes for scoring, bending, stretching, or elongation, and inspect weld beads with a 5 power magnifying glass and dye penetrant. Thereafter, repeat inspections at intervals not exceeding 200 hours' time in service. Replace aluminum alloy pipes within 100 hours' time in service or before 600 hours' time in service, either by replacing with same part numbers or substituting stainless steel pipes per Service Bulletin 442. Discontinue actions after replacing with stainless steel pipes.
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Compliance Time
Within the next 100 hours' time in service after the effective date of this AD, and thereafter at intervals not to exceed 200 hours' time in service from the last inspection.
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Affected Aircraft
Dassault Aviation Fan Jet Falcon airplanes, Serial Numbers 1 thru 111, with aluminum alloy air conditioning pipes P/N MY20-721-28-1 and MY20-721-61-1 installed.
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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