AD 68-19-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aermacchi S.p.A. | S.205 - 22/R | Airworthiness Directives; Siai-Marchetti Model S.205-22/R Airplanes |
Unsafe Condition
The suction gage instrument (Siai P/N NS5F017) lacks proper limitation markings, including a green arc from 4 to 5 inches Hg. and a red radial line at 5 inches Hg., and the suction relief valve may not maintain the required 4.5 ±0.1 inches Hg. at 2200 r.p.m., potentially allowing suction pressures exceeding 5 inches Hg. at maximum engine r.p.m.
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Required Actions
Modify the suction gage instrument by adding a green arc from 4 to 5 inches Hg. and a red radial line at 5 inches Hg., adjust the suction relief valve to achieve 4.5 ±0.1 inches Hg. at 2200 r.p.m., and ensure the suction gage does not exceed 5 inches Hg. at maximum engine r.p.m., following Siai-Marchetti Service Bulletin No. 205B21 or FAA-approved equivalent.
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Compliance Time
within the next 100 hours' time in service after the effective date of this AD unless already accomplished
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Affected Aircraft
Aermacchi S.p.A. Model S.205-22/R airplanes with serial numbers 213, 370, 371, 372, 373, 374, 378, 379, 380, 381, 382, 384, 385, 387, 388, 389, 390, 392, 393, 394, 395, 396, 398, 4-124, 4-125
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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