AD 93-11-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-9-11 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-11, -12, -13, -14, -15, and -15F Series Airplanes |
| aircraft | The Boeing Company | DC-9-12 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-11, -12, -13, -14, -15, and -15F Series Airplanes |
| aircraft | The Boeing Company | DC-9-13 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-11, -12, -13, -14, -15, and -15F Series Airplanes |
| aircraft | The Boeing Company | DC-9-14 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-11, -12, -13, -14, -15, and -15F Series Airplanes |
| aircraft | The Boeing Company | DC-9-15 | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-11, -12, -13, -14, -15, and -15F Series Airplanes |
| aircraft | The Boeing Company | DC-9-15F | Airworthiness Directives; MCDONNELL DOUGLAS DC-9-11, -12, -13, -14, -15, and -15F Series Airplanes |
Unsafe Condition
Degradation of lift due to ice accumulation on the wing leading edge, which can cause significant reduction in stall angle-of-attack and increase stall speed up to 30 knots beyond the stall warning activation speed.
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Required Actions
Revise the AFM Limitations Section to include cautionary notes and procedures for checking ice/frost/snow; modify the bleed air anti-ice system or install a supplemental ice protection system within 9 months after the effective date; and revise AFM operating procedures after modification.
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Compliance Time
Within 10 days after January 17, 1992 (for AFM revision under paragraph (a)), and within 9 months after the effective date (July 22, 1993) for modifications under paragraph (c).
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Affected Aircraft
MCDONNELL DOUGLAS DC-9-11, -12, -13, -14, -15, and -15F series airplanes, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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