AD 93-05-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 737-300 Series | Airworthiness Directives; BOEING Model 737-300, 737-400, and 737-500 Series Airplanes |
| aircraft | The Boeing Company | 737-400 Series | Airworthiness Directives; BOEING Model 737-300, 737-400, and 737-500 Series Airplanes |
| aircraft | The Boeing Company | 737-500 Series | Airworthiness Directives; BOEING Model 737-300, 737-400, and 737-500 Series Airplanes |
Unsafe Condition
Engine flameout during airplane descent in moderate to severe inclement weather conditions.
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Required Actions
Revise the AFM Limitations Section to include operational instructions for moderate to heavy rain, hail, or sleet; ensure weather radar is operable for dispatch in known or forecast precipitation; install a placard near N1 gauges stating minimum 45% N1 requirement. For all models, within 48 months after AD effective date, perform engine modification per Boeing SB 737-77-1031 Rev 1, allowing removal of AFM revisions, placards, and MEL requirements upon completion.
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Compliance Time
Within 10 days after December 30, 1988 for Model 737-300 series (for paragraphs (a)(1)-(3)), and within the next 48 months after the effective date of this AD (April 29, 1993) for engine modification (paragraphs (b)-(c)).
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Affected Aircraft
Boeing Model 737-300, 737-400, and 737-500 series airplanes equipped with CFM International CFM56-3 series engines, 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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